Welcome to webpage of Dr. Arun Dev Dhar Dwivedi

Dr. Arun Dev Dhar Dwivedi

Professor (Associate) School of Electronics Engineering, VIT University email: adddwivedi@gmail.com , dwivedi.add@gmail.com , itbhu.arun@gmail.com

Phone: +91 9450547267

Skype id: adddwivedi

Website: https://sites.google.com/site/homedradddwivedi/dr-a-d-d-dwivedi (personal)

Education:

Ph. D. (Electronics Engineering) IIT BHU (2010) CGPA 8.76/10

Ph. D. Topic: “Investigations on Some Photodetectors for Guided and Unguided Optical Communication Systems”

Thesis Advisor: Prof. P. Chakrabarti, Coordinator Centre for Research in Microelectronics, Department of Electronics Engineering, IIT-BHU, Varanasi. at present, Director, IIEST Shibpur, Botanic Garden, Howrah, West Bengal-711103

M. Sc. Physics (Specialization in Electronics), First class, BHU (2003)

M. Sc. Dissertation topic: “Design and Analysis of PWM, PPM and FSK systems”

Membership of professional bodies and societies

Senior Member IEEE Inc.

Senior Member IEEE Electron Device Society

Senior Member IEEE Communications Society

Member, editorial board of International Journal of Advanced Applied Physics Research

(link: http://www.cosmosscholars.com/editorial-board-i-j-a-a-p-r)

Member, editorial advisory board of following journals from Journals Pub group

· International Journal of Electrical Communication Engineering (IJECE)

· International Journal of Microelectronics and Digital Integrated Circuits (IJMDIC)

· International Journal of Analogue Integrated Circuits (IJAIC)

· International Journals of Power Electronics Controllers and Converters (IJPECC)

Member Editorial Board of Jacobs Journal of Nanomedicine and Nanotechnology

Member Editorial Board of Journal of Photonic Materials and Technology

Reviewer, Journal of electronics materials, Infrared Physics and Technology, IJAAPR, AEEE, IJMDIC etc.

Member international technical committee of international conference on next generation computation technologies (NGCT-2015) held at UPES Dehradun during September 4-5, 2015.

Reviewer in international conference NGCT-2015.

Reviewer in International Workshop on Nanoscience and Nanotechnology & Joint 4th Asia-Pacific Chemical and Biological Microfluidics Conference (IWNN-APCBM 2015).

Google Scholar: https://scholar.google.com/citations?user=pFlEdqQAAAAJ&hl=en

https://www.researchgate.net/profile/Arun-Dev-Dhar-Dwivedi

https://betativ.irins.org/profile/191330

https://orcid.org/0000-0002-7311-7440

Scopus Author ID: 57196274304

Website: https://sites.google.com/site/homedradddwivedi/dr-a-d-d-dwivedi

SPICE Modeling

MOS Technology

- Typically ten to twelve NMOS and PMOS geometries are measured at specified temperature points for DC model
- Area and sidewall junction capacitances, oxide capacitance and overlap capacitances are measured and parameters extracted
- Extracted AC models are verified by measuring and simulating ring oscillator data
- Complete noise characterization for noise voltage and noise current
- Models available include Level 1,2,3, BSIM1, BSIM3, HV MOS Level 88, BSIM4, PSP, HiSIM HV, HiSIM and EKV

BIPOLAR Technology

- DC, junction capacitances, AC (s-parameters), temperature measurements for DC
- Models available include Gummel Poon, Mextram, VBIC
- Macro models to include parasitic device effects

Other Supported Technologies

- Diode: Level 1, 2, 3
- TFT: Poly and Amorphous TFT models
- SOI: BSIMSOI

Assistant Professor, Department of Physics, Central University of Rajasthan, City Road, Kishangarh, District-Ajmer-305802, Rajasthan, India.

Taught- Mathematical methods in Physics, Classical Electrodynamics and Device physics and continued research work on organic photovoltaics and energy harvesting.

Assistant Professor and Coordinator, Centre for Applied Physics, Central University of Jharkhand, Brambe, Mandar, Lohardaga Road, Ranchi-835 205. (July 2010- July 2011)

Taught- Mechanics, Classical Mechanics, Electromagnetism and Optics, Solid state devices, Basic Electrical and Electronics to integrated M. Sc. and M. Tech students. Carried out extensive research in the area of optoelectronics and work is published in journals like Journal of Applied Physics, JED etc.

Senior Research Fellow (SRF) at Department of Electronics Engineering, IT, BHU, (2007-2010).

Continued working on Modeling and simulation which includes, modeling and simulation of infrared photodetectors based on III-V alloys and II-VI alloys for guided optical fiber communication systems and unguided free space optical communication systems respectively.

Also fabrication and characterization of U.V. and visible photodetectors and photovoltaic devices based on ZnO, Zno-Si heterojunction photodiode, solar cells, LEDs, thin film transistors (TFTs), organic solar cells, OTFTs and organic light emitting diodes (OLEDS) based on organic materials e.g. polyanthranilic acid (PANA), polycarbazole (PCz), PANA CNT and PCz CNT.

Junior Research Fellow (JRF) at Department of Electronics Engineering, IT, BHU, (2005-2007)

Here as a research fellow worked for modeling, simulation, fabrication and Characterization of pn junction diodes, Schottky diodes, MOS capacitors, MOSFETs, thick film resistors and thick film capacitors in Centre for research in microelectronics (CRME) IT-BHU, Varanasi, India

Teaching / Lab Instructorship:

•Taught “Computer Fundamentals and Digital Electronics” B. Sc. Computer Science students in Women’s College, Banaras Hindu University, Varanasi (During 2007-2008).

• Worked as lab Instructor in UG / PG Lab. experiments on Electronic Device Lab and Analog Circuits, Department of Electronics Engineering, IT, BHU, Varanasi (2006-2007).

•Worked as Lab instructor in Optical communication Lab. to conduct of UG / PG Lab. classes, Department of Electronics Engineering, I. T. BHU, Varanasi (2009-2010)

•Worked as an Assistant Professor, Department of Physics, Central University of Rajasthan, Kishangarh (Ajmer), India

Lab Development:

•Designed and developed Applied Physics Lab (Mechanics, Electricity and Magnetism, Optics, Electrical Engg. and Electronics Engg. Lab) at Central University of Jharkhand.

•Developing M. Sc. Physics Lab at Central University of Rajasthan.

Areas of Research Interest:

• SPICE modeling and parameter extraction of MOSFET and SOI MOSFET

• TCAD and EDA for process device and parameter extraction

• VLSI and Microelectronics

• Optoelectronic / Photonic Devices - Modeling and Simulation

• Flexible/ Organic / Plastic Electronics (organic photovoltaic (OPV) OTFT, OLED etc)

• Photodetectors for optical communication and sensing applications and optical sources (LEDs and LASERs)

• Fabrication / characterization of inorganic and organic semiconductor optoelectronic devices

• Solar Cells (based on organic and Inorganic materials)

• ZnO thin film based devices

• MEMS/NEMS (Optical and Electrical study)

Knowledge of CAD & Simulation Tools:

Simulation and CAD tools: Synopsis Sentaurus TCAD, Silvaco TCAD and EDA tools, LT Spice, Electric VLSI, Cadence Virtuoso.

Agilent ICCAP and ADS, Silvaco UTMOST-III and UTMOST-IV

MATLAB, MATHEMATICA, Tanner Tools, and Multisim-2001, 2010, Hardware description languages Verilog/ Verilog-A,

TCAD

VICTORY Process is a general purpose 3D process simulator. VICTORY Process includes a complete process flow core simulator and three advanced simulation modules: Monte Carlo Implant, Advanced Diffusion and Oxidation, and Physical Etch and Deposit. Proprietary models, as well as public domain research models, can be easily integrated into VICTORY Process using the open modeling interface.

VICTORY Device is a general purpose 3D device simulator. A tetrahedral meshing engine is used for fast and accurate simulation of complex 3D geometries. VICTORY Device performs DC, AC and transient analysis for silicon-based semiconductor devices, binary, ternary, quaternary and organic material-based devices.

VICTORY Stress is a generic 3D stress simulator designed to calculate stresses and mobility enhancement factors for any 3D structure using comprehensive material stress models, including the dependence of elasticity coefficients on crystal orientation.

ATHENA framework integrates several process simulation modules within a user-friendly environment provided by Silvaco TCAD interactive tools. ATHENA has evolved from a world-renowned Stanford University simulator SUPREM-IV, with many new capabilities developed in collaboration with dozens of academic and industrial partners. ATHENA provides a convenient platform for simulating processes used in semiconductor industry: ion implantation, diffusion, oxidation, physical etching and deposition, lithography, stress formation and silicidation.

Fast and accurate simulation of all critical fabrication steps used in CMOS, bipolar, SiGe/SiGeC, SiC, SOI, III-V, optoelectronic, MEMS, and power device technologies

Accurately predicts multi-layer topology, dopant distributions, and stresses in various device structures

ATLAS enables device technology engineers to simulate the electrical, optical, and thermal behavior of semiconductor devices. ATLAS provides a physics-based, easy to use, modular, and extensible platform to analyze DC, AC, and time domain responses for all semiconductor based technologies in 2 and 3 dimensions.

· Accurately characterize physics-based devices in 2D or 3D for electrical, optical, and thermal performance without costly split-lot experiments

· Solve yield and process variation problems for optimal combination of speed, power, density, breakdown, leakage, luminosity, or reliability

· Fully integrated with ATHENA process simulation software, comprehensive visualization package, extensive database of examples, and simple device entry

· Availability silicon, III-V, II-VI, IV-IV, or polymer/organic technologies including CMOS, bipolar, high voltage power device, VCSEL, TFT, optoelectronic, LASER, LED, CCD, sensor, fuse, NVM, ferro-electric, SOI, Fin-FET, HEMT, and HBT

· Connect TCAD to Tapeout with direct import of ATLAS results into UTMOST for SPICE parameter extraction

VWF is software used for performing Design of Experiments (DOE) and Optimization Experiments. Split-lots can be used in various pre-defined analysis methods. Split parameters can be defined for any of Silvaco’s process, device, parasitic extraction and circuit simulators.

ANALOG / MIXED-SIGNAL / RF

Gateway SmartSpice SmartSpiceRF Harmony UTMOST III UTMOST IV SPAYN

Gateway is schematic Editor

SmartSpice delivers the highest performance and accuracy required to design complex high precision analog circuits, analog mixed-signal circuits, analyze critical nets, characterize cell libraries, etc.. SmartSpice is compatible with popular analog design flows and foundry-supplied device models.

SmartSpiceRF employs a combination of Time-Domain Shooting and Frequency-Domain Harmonic Balance methods to provide accurate simulation of GHz range RF ICs. It accurately and efficiently simulates harmonic distortion, intermodulation products, gains, noise, oscillator’s phase noise in non-linear circuits using SPICE netlists.

UTMOST III generates accurate, high quality SPICE models for analog, mixed-signal and RF applications. UTMOST III is in use worldwide by leading IDMs, foundries and fabless companies to perform data acquisition, device characterization, model parameter extraction and model verification.

· UTMOST III supports the characterization and model extraction for MOS, BJT, Diode, JFET, GaAs, SOI and TFT devices

· UTMOST III provides the widest selection of measurement equipment from a variety of vendors

· Fully interactive, semi-automated or batch-mode operation is supported

· Real-time model tuning using the rubberband feature

· Integrated with Silvaco TCAD Software and SPAYN statistics program for smooth development of pre-silicon models

· Supports all leading SPICE simulators

UTMOST IV represents the next generation in SPICE model optimization software. UTMOST IV provides powerful tool for developing SPICE models. UTMOST IV provides an easy to use tool for the generation of accurate, compact models and macro-models for analog, mixed-signal and RF applications.

Harmony is a single-kernel analog/mixed-signal circuit simulator that dynamically links in the capabilities of the SmartSpice Circuit Simulator and the SILOS Verilog Simulator at run time. Harmony combines accuracy, performance, capacity and flexibility to simulate circuits expressed in Verilog, SPICE, Verilog-A and Verilog-AMS.

SPAYN is a statistical modeling tool for analyzing variances from model parameter extraction sequences, electrical test routines, and circuit test measurements. SPAYN helps to identify the relationship between device or circuit performance variations and the process fluctuations.

CUSTOM IC CAD

Expert Guardian HIPEX ClarityRLC

Expert is a high performance hierarchical IC layout editor with full editing features, large capacity and fast layout viewing. Expert provides high level of design assistance with Netlist Driven Layout and parameterized cells (Pcells).

Guardian provides interactive and batch mode verification of analog, mixed signal and RF IC designs. Integrated with Silvaco's schematic capture and layout editor, Guardian efficiently performs design rule checks (DRC) and layout vs. schematic (LVS) comparisons.

HIPEX is an accurate and fast full-chip hierarchical extraction software that performs extraction of parasitic capacitances and resistances from hierarchical layouts. HIPEX is tightly integrated with the Expert Layout Editor for complete design flow of DRC/LVS and RC parasitic extraction.

ClarityRLC is an efficient and accurate tool that performs reduction of linear parasitic RLC elements in extracted netlists. Tool is based on Scattering-Parameter-Based Macromodeling and Time Domain methods.

INTERCONNECT

EXACT QUEST CLEVER STELLAR

EXACT delivers the most accurate interconnect models for nanometer semiconductor processes and generates full chip layout parameter extraction (LPE) rule files. EXACT’s powerful 3D field solver and scripting language allows support for any full chip parasitic extractor.

QUEST calculates 3D frequency dependent inductance, resistance, capacitance and capacitive loss for any multi-port network for RF SPICE analysis. QUEST creates frequency dependent and independent SPICE models for W-element transmission lines, inductors and MIM capacitors from GDSII layouts.

CLEVER is a physics-based RC extractor that uses GDSII mask data and process information to create a realistic 3D structure for MEMS, advanced CMOS, TFT, Memory cells, etc., using its built-in etch/deposit processor and optolithographical simulator. CLEVER back annotates extracted RCs into SPICE netlist.

STELLAR fills the size gap between typical small cell field solvers and full chip extractors. STELLAR uses a new highly efficient fictitious domain field solver to characterize cells containing tens of thousands of active elements, providing the physics-based accuracy of a field solver with the cell size capability of a full chip extractor.

DIGITAL CAD

SILOS AccuCell AccuCore HyperFault CatalystAD CatalystDA Spider

SILOS is an easy-to-use IEEE-1364-2001 compliant Verilog simulator used by leading IC designers. An industry standard since 1986, its powerful interactive debugging features provide today’s most productive design environment for FPGA, PLD, ASIC and custom digital designs.

AccuCell is an accurate, automated, fast and flexible software tool for characterizing and validating standard cell, I/O and custom cell libraries.

AccuCore performs timing characterization of multi-million device circuits with SmartSpice accuracy and performs block and full-chip Static Timing Analysis (STA) on multi-million gate designs.

HyperFault is a Verilog IEEE-1364-2001 compliant fault simulator that analyzes test vectors’ ability to detect faults. Supports mixed levels of gate, behavioral, and switch with SDF timing.

CatalystAD is the premier tool for converting transistor-level designs into verilog gate-level representations with applications in microprocessor, DSP, graphics and high-speed communication markets.

CatalystDA is a software program that translates a structural Verilog netlist into equivalent SPICE format netlist to be used for layout verification or SPICE simulation.

Technical Skills:

Simulation and CAD tools: Synopsis SENTAURUS TCAD, Silvaco TCAD and EDA tools, MATLAB, LT Spice, Electric VLSI, Cadence Virtuoso. Agilent ICCAP and ADS, Silvaco UTMOST-III and UTMOST-IV

Experimental Skills:

Thin film deposition using sol gel process, Vacuum coating technique, Measurements using probe stations and device (pn junction, Schottky diodes, MOS capacitor, BJTs, FETs, MOSFETS, OPDs, OTFTs) characterization using HP semiconductor analyzer. Hall four probe measurement, LCR meter etc.

Clean room techniques: Photo-lithography; Resist Spinning and Developing; Etching (Wet and Dry)
Thin film. Deposition Equipment: Thermal Chemical Vapor Deposition System; Sputtering System, Ellipsometry.
Characterization Equipment: Scanning Electron Microscopy, Transmission Electron Microscopy, EDS, Atomic Force Microscopy and FTIR, Photoluminescence Spectroscopy, X-ray diffraction analysis (XRD), Electrochemical Characterization

Fellowships / Awards / Prizes / Certificates etc.:

• According to AD Scientific-Listed in top 2% Scientist of the world-2023.

• According to AD Scientific-Listed in top 2% Scientist of the world-2022.

• Story about my paper published in current applied Physics in issue of May 2010, on organic photodetectors has been published by nature.com

• Marquis Who's Who has selected my biography for inclusion in 2011-2012 (11th) Edition of Who's Who in Science and Engineering, the world renowned reference directory brought by the publisher of Who's Who in America.

• Recipient of INSA Travel Fellowship (2008) for attending “International Workshop on Recent Advances of Low Dimensional Structures and devices (WRALDSD-2008)”, School of Physics and Astronomy, University of Nottingham, Nottingham U.K., April 7-9 April 2008.

• Awarded UGC-SRF (2007), Department of Electronics Engineering, I. T. BHU, Varanasi-221005

• Awarded UGC-JRF (2005), Department of Electronics Engineering, I. T. BHU, Varanasi-221005

• Qualified Graduate Aptitude Test in Engineering (GATE) (2005)

• Qualified Joint entrance screening test (JEST) (2004)

• Qualified National Eligibility Test (NET) in Electronic Science (December-2003)

References:

1. Prof. P Chakrabarti, Coordinator, Centre for Research in Microelectronics (CRME), Department of Electronics Engineering,

IIT, BHU, Varanasi-221005,

At present Director, Motilal Nehru National Institute of Technology, Allahabad

Email-pchakra@bhu.ac.in, pchakrabarti.ece@itbhu.ac.in

Phone: +91-542-26701268 (O), 2369301 (R) 09451938297 (M)

Fax: +91-542-2368428 & 2366758(O)

2. Prof. S. Jit, Department of Electronics Engineering, IIT, BHU, Varanasi-221005

Email- sjit.ece@itbhu.ac.in, sjit@bhu.ac.in ,

Phone- +91-542-2575492, +91-9453364250 (M)

3. Prof. Rajiv Prakash, Coordinator School of Material Science and Technology, IIT, BHU, Varanasi-221005,

Email- rajivprakash12@yahoo.com,

Phone: +91-542-2307047, Fax: +91-542-2368707

List of Publications

Here is the list of selected important Publications:

1. V. Devarakonda, A.D.D. Dwivedi, Pandey A., P. Chakrabarti. “Performance analysis of N+-CdTe/n0-Hg0.824675Cd0.175325Te/p+- Hg 0.824675Cd 0.175325Te n-i-p photodetector operating at 30 μm wavelength for terahertz applications” Optical and Quantum Electronics, Vol. 52, pp.1-19, 2020. [Impact factor-2.797] [Q2]

2. Varun Chandra, A. D. D. Dwivedi and Nidhi Sinha "TCAD Based performance Assessment of Indium Gallium Nitride based Single Junction Solar Cells for different Mole Fractions of Indium" Optical and Quantum Electronics, Volume 53, Year 2021, DOI:10.1007/s11082-020-02709-7 . [Impact Factor-2.797] [Q2]

3.S. S. Soley and A. D. D. Dwivedi “Numerical Simulation and Performance Analysis of InGaP, GaAs and Ge Single Junction Solar Cells” Materials Today: Proceedings, Volume 39, Part 5, 2021, pp. 2050-2055, DOI:10.1016/j.matpr.2020.11.056 [Impact Factor-1.46] [Q2]

4. A. D. D. Dwivedi, S. K. Jain, Rajeev Dhar Dwivedi and Shubham Dadhich "Numerical Simulation and Compact Modeling of Low Voltage Pentacene Based OTFTs" Journal of Science: Advanced Materials and Devices, Vol.4, issue-4, pp.561-567, (2019). https://doi.org/10.1016/j.jsamd.2019.10.006. [Impact Factor-7.382] [Q1]

5. A. D. D. Dwivedi and Pooja Kumari "TCAD Simulation and Performance Analysis of Single and Dual gate OTFTs" Surface Review letters, Vol. 27, No. 05, 1950145 (2020). DOI:https://doi.org/10.1142/S0218625X19501452. [Impact Factor-1.24] [Q3]

6. A. D. D. Dwivedi, Shubham Dadhich and A. K. Singh "Fabrication, Characterization, Numerical Simulation and Compact Modeling of P3HT based Organic Thin Film Transistors (OTFTs)" Journal of Semiconductors, Vol. 42, Year 2021 DOI:10.1088/1674-4926/42/7/074102 . [Impact factor-2.677] [Q1]

7. A. K. Singh, A. D. D. Dwivedi, A. Pandey and P. Chakrabarti " Design and implementation of an inverter and its application in ring oscillator circuits using an organic-thin-film-transistor based on an FTM-derived channel" Semiconductor Science and Technology, Volume 36, Year 2021 DOI:10.1088/1361-6641/ac274f . [Impact Factor-2.048] [Q2]

8. Sumit Vyas, A D D Dwivedi and Rajeev Dhar Dwivedi, "Effect of gate dielectric on the performance of ZnO based thin film transistor " Superlattices and Microstructures, Vol.120, pp.223-234, 2018. https://doi.org/10.1016/j.spmi.2018.05.040 . [Impact Factor-3.22] [Q2]

9. A. D. D. Dwivedi, Anjan Chakravorty, R. D'Esposito, A. K. Sahoo, S. Fregonese and T. Zimmer "Effect of BEOL on Self-heating and mutual thermal coupling in SiGe multi finger HBTs" Solid State Electronics" Vol.115, pp 1-6, 2016. DOI: 10.1016/j.sse.2015.09.016 [Impact Factor-1.916] [Q2]

10. A. D. D. Dwivedi, R. D'Esposito, A. K. Sahoo, S. Fregonese and T. Zimmer "A study on self-heating and mutual thermal coupling in SiGe multi-finger HBTs " Journal of Electronic Materials, Vol.45, Issue 11, pp 5612–5620, 2016. DOI: 10.1007/s11664-016-4728-6 [Impact Factor-2.047] [Q3]

11. A. D. D. Dwivedi, “Analytical Modeling and Numerical Simulation of P+-Hg0.69 Cd0.31Te/n-Hg0.78Cd0.22Te/CdZnTe Heterojunction Photodetector for LWIR Free Space Optical Communication System,” Journal of Applied Physics, Vol.110, 043101 (2011). DOI: 10.1063/1.3615967 [Impact Factor-2.877] [Q2]

12. A.D.D. Dwivedi, A. Mittal, A. Agrawal and P. Chakrabarti, “Analytical Modeling and ATLAS Simulation of N+-InP/n0-In0.53Ga0.47As/p+In0.53Ga0.47As p-i-n Photodetector for Optical Fiber Communication,” Infrared Physics & Technology, Vol. 53, no. 4, p. 236-245 (2010). DOI: 10.1016/j.infrared.2010.03.003 [Impact Factor-2.997] [Q2]

13. A.D.D. Dwivedi, Arun Kumar Singh, Rajiv Prakash and P. Chakrabarti, “A Proposed Organic Schottky Barrier Photodetector for application in the Visible Region,” Current Applied Physics, Vol. 10, pp. 900-903, 2010. DOI: 10.1016/j.cap.2009.10.019 [Impact Factor-2.856] [Q2]

14. Arun Kumar Singh, A. D. D. Dwivedi, P. Chakrabarti and Rajiv Prakash, “Electronic and Optical Properties of Electrochemically Polymerized Polycarbazole/Aluminum Schottky Diodes,” Journal of Applied Physics, Vol.105, 114506 (2009). DOI: 10.1063/1.3139277 [Impact Factor-2.877] [Q2]

15. Arun Kumar Singh, Rajiv Prakash, A. D. D. Dwivedi and P. Chakrabarti, “Electronic Properties and Junction Behaviour of Polyanthranilic Acid / Metal Contacts.” IEEE Electron Device Letters, Vol. 29, no.6, pp. 571-574, (2008). DOI: 10.1109/LED.2008.922730 [Impact Factor-4.816] [Q1]

16. Arun Kumar Singh, Rajiv Prakash, A. D. D. Dwivedi and P. Chakrabarti, “Electronic Properties and Junction Behaviour of Micro and Nanometer Sized Polyanthranilic Acid / Metal Contacts.” Synthetic Metals, Vol. 158, pp.939-945, (2008). DOI: 10.1016/j.synthmet.2008.06.020 [Impact Factor-4.0] [Q1]

17. A.D.D. Dwivedi and P. Chakrabarti, “Modeling and Analysis of Photoconductive Detectors based on Hg1-xCdxTe for free Space Optical Communication.” Optical and Quantum Electronics, Vol. 39, pp. 627-641, 2007. DOI: 10.1007/s11082-007-9122-4 [Impact Factor-2.797] [Q2]

18. Lavesh Gupta and A. D. D. Dwivedi "Suppression of Coupling in Microstrip Antenna Array by grounded defected strips in Bluetooth Devices" Journal of Computational Electronics, Vol.17, pp.436-441, (2018).

DOI: 10.1007/s10825-017-1088-2 [Impact Factor-1.983] [Q3]

19. Lavesh Gupta and A. D. D. Dwivedi "Suppression of Mutual Coupling Between Two Microstrip Patch Antennas using a Sophisticated Non-Linear DGS Structure for High Frequency Wave-Applications" The Law, State and Telecommunications Review / Revista de Direito, Estado e Telecomunicações, Vol.10, No-1, pp. 161-184, May (2018). DOI: 10.26512/lstr.v10i1.21505

20. A.D.D. Dwivedi and P. Chakrabarti, “Sensitivity analysis of an HgCdTe based photovoltaic receiver for long- wavelength free space optical communication systems” Optoelectronics Letters, Vol.5, pp. 21-25, (2009). DOI: 10.1109/ICIMW.2007.4516749 [Impact Factor-0.231] [Q3]

21. A.D.D. Dwivedi and P. Chakrabarti, “Analytical Modeling and ATLAS Simulation of N+-Hg0.69 Cd0.31Te /n0- Hg0.78 Cd0.22Te/p+Hg0.78 Cd0.22Te p-i-n Photodetector for Long wavelength Free Space Optical Communication,” Optoelectronics and Advanced Materials-Rapid Communications (OAM-RC), Vol. 4, no-4, pp. 480-497, (2010). DOI: 10.1063/1.3615967 [Impact Factor-0.556] [Q4]

22. S. S. Soley and A. D. D. Dwivedi "Advances in high efficiency crystalline silicon homo junction solar cell technology" AIP Conference Proceedings 2104, 030033 (2019); https://doi.org/10.1063/1.5100460. [Impact Factor-0.4]

23. Ghusoon M. Ali, A. D. D. Dwivedi, S. Singh, and P. Chakrabarti “Interface properties and junction behavior of Pd contact on ZnO thin film grown by vacuum deposition technique,” Physica Status Solidi (PSS) C, Vol.7, pp. 252-255, 2010. DOI: 10.1002/pssc.200982409 [Impact Factor-2.17]

Book Chapters:

1. A. D. D. Dwivedi, S. K. Jain, Rajeev Dhar Dwivedi and Shubham Dadhich "Numerical simulation and compact modeling of thin film transistors for flexible electronics" in INTECK book on Hybrid Nanomaterials: Flexible Electronics Materials, June, (2020), INTECK, UK, ISBN: 978-1-83880-338-4, DOI: 10.5772/intechopen.90301

2. S. K. Jain, Amit M. Joshi and A. D. D. Dwivedi Chapter-8,"Technology and Modeling of DNTT Organic Thin Film Transistors" in Advanced Technologies for Next Generation Integrated Circuits, 2020, published by IET UK, May 2020, Book DOI: 10.1049/PBCS049E, Chapter DOI:10.1049/PBCS049E_ch8, e-ISBN: 9781785616655.

3. Dadhich, S., Dwivedi, A.D.D., Mathur, G, “Numerical Simulation and Analytical Modelling of C8-BTBT-C8 Organic Transistor and Analysis of Semiconductor Thickness.” Lecture Notes series in Electrical Engineering , Intelligent Computing Techniques for Smart Energy Systems Vol. 862, pp 669–680, 2022, https://doi.org/10.1007/978-981-19-0252-9_60 , Online ISBN978-981-19-0252-9, Print ISBN978-981-19-0251-2 .

International Journals:

Expanded List of Publications:

International Journal Publication(s):

1. A. D. D. Dwivedi, Shubham Dadhich and A. K. Singh "Fabrication, Characterization, Numerical Simulation and Compact Modeling of P3HT based Organic Thin Film Transistors (OTFTs)" Journal of Semiconductors, Vol. 42, Year 2021 DOI:10.1088/1674-4926/42/7/074102 .

2. A. K. Singh, A. D. D. Dwivedi, A. Pandey and P. Chakrabarti " Design and implementation of an inverter and its application in ring oscillator circuits using an organic-thin-film-transistor based on an FTM-derived channel" Semiconductor Science and Technology, Volume 36, Year 2021 DOI:10.1088/1361-6641/ac274f .

3. Varun Chandra, A. D. D. Dwivedi and Nidhi Sinha "TCAD Based performance Assessment of Indium Gallium Nitride based Single Junction Solar Cells for different Mole Fractions of Indium" Optical and Quantum Electronics, Volume 53, Year 2021, DOI:10.1007/s11082-020-02709-7 .

4. S. S. Soley and A. D. D. Dwivedi “Numerical Simulation and

Performance Analysis of InGaP, GaAs and Ge Single Junction Solar Cells” Materials Today: Proceedings, Volume 39, Part 5, 2021, pp. 2050-2055, DOI:10.1016/j.matpr.2020.11.056 .

5. V. Devarakonda, A.D.D. Dwivedi, Pandey A., P. Chakrabarti. “Performance analysis of N+-CdTe/n0-Hg0.824675Cd0.175325Te/p+- Hg 0.824675Cd 0.175325Te n-i-p photodetector operating at 30 μm wavelength for terahertz applications” Optical and Quantum Electronics, Vol. 52, pp.1-19, 2020.

6. A. D. D. Dwivedi and Pooja Kumari "TCAD Simulation and Performance Analysis of Single and Dual gate OTFTs" Surface Review letters, Vol. 27, No. 05, 1950145 (2020). DOI: https://doi.org/10.1142/S0218625X19501452 .

7. S. K. Jain, Shubham Dadhich and A. D. D. Dwivedi "Numerical simulation based comparative study of P3HT based top contact and bottom contact OTFTs" Journal of Electronic Design and Technology, Vol. 10, issue (3), pp.27-32, 2020.

8. Rohit Kumar Bairwa and A. D. D. Dwivedi "Modeling and Simulation of ZnO/Si Heterojunction photodetector for optical communication" Trends in Opto-Electro and Optical Communications, Vol.9, issue(3), pp.19-27, 2020.

9. SAGAR S. MOTDHARE and ARUN DEV DHAR DWIVEDI “DETECTION AND REMOVAL OF ARTIFACTS FROM EEG RECORDS- A REVIEW” American Journal of Engineering Research and Reviews, 2020, 3:22

10.A. D. D. Dwivedi, S. K. Jain, Rajeev Dhar Dwivedi and Shubham Dadhich "Numerical Simulation and Compact Modeling of Low Voltage Pentacene Based OTFTs" Journal of Science: Advanced Materials and Devices, Vol.4, issue-4, pp.561-567, (2019).

11.A. D. D. Dwivedi, Rajeev Dhar Dwivedi, Raghvendra Dhar Dwivedi, and Qingda Zhao, “Technology computer aided design (TCAD) based simulation and compact modeling of Organic Thin Film Transistors (OTFTs) for circuit simulation” International Journal of Advanced Applied Physics Research Vol.6, pp.1-5, (2019).

12.A. D. D. Dwivedi and Pooja Kumari "Numerical simulation and Characterization of pentacene based Organic thin film transistors with Top and Bottom Gate Configurations" GJRE-F (2019) Volume 19 Issue 3: pp.7-12.

13.Lavesh Gupta and A. D. D. Dwivedi "Design and Simulation of Microstrip Patch Antenna for C-Band Communication Services" GJRE-F (2019) Vol. 19 Issue 3: pp.19-25.

14.Stuti Neha, Lavesh Gupta and A. D. D. Dwivedi " Design and Fabrication of Miniaturized Dual band Antenna using Split-Ring & Defected Ground Structure for ISM band Applications" GJRE-F , Vol. 19, Issue-4, (2019).

15.Lalit Dalwani, Lavesh Gupta and A. D. D. Dwivedi "Design and fabrication of micro strip patch antenna Using DGS for WLAN and WIMAX applications" Journal of Microwave Engineering and Technologies Vol.7, issue (1), pp.5-16, 2019.

16.Deepak Kumar Mangal, A. D. D. Dwivedi, Md. Asif Iqbal and Surender Kumar Sharma, "TCAD based Simulation and Performance Optimization of in x Ga(1-x)N based Solar Cell" accepted in Global Journal of Researches in Engineering-F, Vol. 19, Issue-4, 2019.

17.S. S. Soley and A. D. D. Dwivedi "Advances in high efficiency crystalline silicon homo junction solar cell technology" AIP Conference Proceedings 2104, 030033 (2019); https://doi.org/10.1063/1.5100460.

18.Suchitra and A. D. D. Dwivedi "Electrothermal simulation of AlGaN/GaN HEMTs" Journal of Semiconductor Devices and Circuits, Vol.6, issue (2), pp.18-27, 2019.

19.Pooja Kumari and A. D. D. Dwivedi "Numerical Simulation and Parameter Analysis for Pentacene based Organic Thin Film Transistor with HfO2 Gate Dielectric" Journal of Semiconductor Devices and Circuits, Vol. 6, issue (2), pp.28-34 (2019).

20.Pooja Kumari and A. D. D. Dwivedi "Numerical Simulation of Pentacene based organic thin film transistors with inorganic gate dielectrics" Journal of Microelectronics and solid state devices, Vol.6, issue (2), pp. 32-38, 2019.

21.Akansha Choudhary, A. D. D. Dwivedi and Simranjit Singh Sudan "Numerical simulation and modeling of Self heating in SOI MOSFET" Journal of Semiconductor Devices and Circuits," Vol.5, issue-3, pp.18-24, 2018.

22.Sumit Vyas, A D D Dwivedi and Rajeev Dhar Dwivedi, "Effect of gate dielectric on the performance of ZnO based thin film transistor " Superlattices and Microstructures, Vol.120, pp.223-234, 2018.

23.Narendra Singh Kushwah, A. D. D. Dwivedi "Computer modeling of Organic Thin film Transistors using Verilog-A" Journal of Microelectronics and Solid state Devices, Vol.5, pp 1-7, 2018.

24.Mahima Asthana, A D D Dwivedi "Metal Oxide Based Thin Film Transistors for Transparent and Flexible Electronics: Critical Review" Journal of Electronic Design Technology. Vol. 9(1): pp.30–40, 2018.

25.Ashish Jha, A. D. D. Dwivedi "Numerical Simulation and Modeling of Graphene Field Effect Transistors for High Frequency Applications" Journal of Microelectronics and Solid state Devices, Vol. 5(1), pp. 27-33, 2018.

26.Pooja Kumari, A. D. D. Dwivedi "Modeling and Simulation of Pentacene based Organic Thin Film Transistors with Organic Gate Dielectrics" Journal of Microelectronics and Solid state Devices, Vol.4, pp-12-17, 2017.

27.Pooja Kumari, A. D. D. Dwivedi "2D Numerical Simulation and Modeling of High Performance Pentacene Organic Thin Film Transistor based on Poly (3-Dodecylthiophene-2, 5-Diyl) Dielectric Layer" International Journal on Future Revolution in Computer Science & Communication Engineering, Vol.3, pp 5-7, 2017.

28.Mohammad Asif Iqbal, Arun Dev Dhar Dwivedi “ Investigations of Indium Gallium Nitride Properties For Enhancement of Performance of Solar Cells” International Journal of Creative Research Thoughts (IJCRT) Volume 6, Issue 1 January 2018,ISSN: 2320-2882, pp 605-608.

29.Shilpi Raj and A. D. D. Dwivedi "Comparative Study of MEH-PPV, Alq3 and P3HT based OLEDs" Trends in Opto-Electro and Optical Communications, Vol.8, no.2, pp-25-43, (2018).

30.Shilpi Raj and A. D. D. Dwivedi "Numerical Simulation of P3HT based Organic Light Emitting Diodes" International Journal of Advanced Applied Physics Research, Vol.5, issue-1, pp. 7-13, (2018).

31.Lavesh Gupta and A. D. D. Dwivedi "Suppression of Mutual Coupling Between Two Microstrip Patch Antennas using a Sophisticated Non-Linear DGS Structure for High Frequency Wave-Applications" The Law, State and Telecommunications Review / Revista de Direito, Estado e Telecomunicações, Vol.10, No-1, pp. 161-184, May (2018).

32.Lavesh Gupta and A. D. D. Dwivedi "Suppression of Coupling in Microstrip Antenna Array by grounded defected strips in Bluetooth Devices" Journal of Computational Electronics, Vol.17, pp.436-441, (2018).

33.Nishchal Patni, A. D. D. Dwivedi, Deepak Kumar, Rahul Bothra and Anjali Kumari , "Modelling and Simulation of Self Heating in GaN based High Electron Mobility Transistors (HEMTs)" International Journal of Advanced Applied Physics Research, Vol. 4, pp-22-27, (2017).

34.Rohit Kumar Bairwa, Chanchal Soni, Roopendra Kumar, Deepak Kumar and A. D. D. Dwivedi " Comparison of Adders for High Speed ALU" International Journal of VLSI Design and Technology, Vol.3, pp.1-9, (2017).

35.Shilpi Raj and A. D. D. Dwivedi "Electrical and Optical Study of MEH-PPV-Based OLED" International Journal of Microelectronics and Digital integrated circuits, Vol.3, pp. 1-9, (2017).

36.Nidhi Sinha, Varun Chandra and A. D. D. Dwivedi, "TCAD Based Assessment and Performance Optimization of ZnO/Si Heterojunction Based Thin-film Solar Cell" International Journal of Advanced Applied Physics Research, Vol. 3, no.2 pp 34-39, 2016.

37.Nidhi Sinha, Varun Chandra and A D D Dwivedi" Modeling and Simulation of n-ZnO/i-ZnO/Si p-i-n Heterojunction Solar Cell" International Journal of Microelectronics and Digital integrated circuits, Vol.2, Issue-2, pp-1-5, 2016.

38.Sumit Vyas, Shaivalini Singh and A. D. D. Dwivedi "Deposition and Characterization of ZnO Thin Films by Thermal Vacuum Thermal Evaporation Method for Photoconductive Sensor Application" International Journal of Microelectronics and Digital integrated circuits, Vol. 2, pp 1-7, 2016.

39.A. D. D. Dwivedi, Anjan Chakravorty, R. D'Esposito, A. K. Sahoo, S. Fregonese and T. Zimmer "Effect of BEOL on Self-heating and mutual thermal coupling in SiGe multi finger HBTs" Solid State Electronics" Vol.115, pp 1-6, 2016.

40.A. D. D. Dwivedi, R. D'Esposito, A. K. Sahoo, S. Fregonese and T. Zimmer "A study on self-heating and mutual thermal coupling in SiGe multi-finger HBTs " Journal of Electronic Materials, Vol.45, Issue 11, pp 5612–5620, 2016.

41.S. Patel, A. D. D. Dwivedi and P. Chakrabarti, "Numerical simulation of GaAs based MISFET photodetector for optical communication" International Journal of Microelectronics and Digital integrated circuits, Vol. 2, No-1, pp 17-29, 2016.

42.A.D.D. Dwivedi and P. Chakrabarti, “Analytical Modeling and Numerical Simulation of Hg1-xCdxTe based N+n0p+ Photodetector for MWIR Free Space Optical Communication,” International Journal of Advanced Applied Physics Research, Vol.2, pp-20-27, 2015.

43.A.D.D. Dwivedi, Rajeev Dhar Dwivedi, Raghvendra Dhar Dwivedi, Sumit Vyas and P. Chakrabarti, "Numerical simulation of P3HT based Organic Thin Film Transistors (OTFTs)" International Journal of Microelectronics and Digital integrated circuits, Vol.1, issue-2, pp.13-20, 2015.

44.A. D .D. Dwivedi, A. Pranav, Gaurav Gupta and P. Chakrabarti, "Numerical Simulation of HgCdTe based simultaneous MWIR/LWIR photodetector for free space optical communication" International Journal of Advanced Applied Physics Research, Vol.2, pp.37-45, 2015.

45.A. D .D. Dwivedi, "Numerical Simulation and Spice Modeling of Organic Thin FilmTransistors (OTFTs)" International Journal of Advanced Applied Physics Research, Vol.1, pp.14-21, 2014.

46.A. D .D. Dwivedi, “Analytical Modeling and Numerical Simulation of P+-Hg0.69 Cd0.31Te/n-Hg0.78Cd0.22Te/CdZnTe Heterojunction Photodetector for LWIR Free Space Optical Communication System,” Journal of Applied Physics,Vol.110, 043101 (2011) (Among top 20 most downloaded article of Journal of Applied Physics from American Institute of Physics group in the month of August 2011).

47.A. D. D. Dwivedi, “Analytical Modeling and ATLAS Simulation of p+-Hg0.78 Cd0.22Te/n-Hg0.78Cd0.22Te/CdZnTe Homojunction Photodetector for LWIR Free Space Optical Communication System,” Journal of Electron Devices, Vol. 9, pp. 396-404, (2011).

48.A.D.D. Dwivedi and P. Chakrabarti, “Sensitivity Analysis of an Hg1-xCdxTe based Photoconductive Receiver for Long Wavelength Free space optical communication at 9.6 µm,” Journal of Electron Devices, Vol. 9, pp. 390-395, (2011).

49.A.D.D. Dwivedi, A. Mittal, A. Agrawal and P. Chakrabarti, “Analytical Modeling and ATLAS Simulation of N+-InP/n0-In0.53Ga0.47As/p+In0.53Ga0.47As p-i-n Photodetector for Optical Fiber Communication,” Infrared Physics & Technology, Vol. 53, no. 4, p. 236-245 (2010). (among top 25 hottest articles of science direct in May 2010).

50.A.D.D. Dwivedi and P. Chakrabarti, “Analytical Modeling and ATLAS Simulation of N+-Hg0.69 Cd0.31Te /n0- Hg0.78 Cd0.22Te/p+Hg0.78 Cd0.22Te p-i-n Photodetector for Long wavelength Free Space Optical Communication,” Optoelectronics and Advanced Materials-Rapid Communications (OAM-RC), Vol. 4, no-4, pp. 480-497, (2010).

51.Ghusoon M. Ali, A. D. D. Dwivedi, S. Singh, and P. Chakrabarti “Interface properties and junction behavior of Pd contact on ZnO thin film grown by vacuum deposition technique,” Physica Status Solidi (PSS) C, Vol.7, pp. 252-255, 2010.

52.A.D.D. Dwivedi, Arun Kumar Singh, Rajiv Prakash and P. Chakrabarti, “A Proposed Organic Schottky Barrier Photodetector for application in the Visible Region,” Current Applied Physics, Vol. 10, pp. 900-903, 2010.

53.Arun Kumar Singh, A. D. D. Dwivedi, P. Chakrabarti and Rajiv Prakash, “Electronic and Optical Properties of Electrochemically Polymerized Polycarbazole/Aluminum Schottky Diodes,” Journal of Applied Physics, Vol.105, 114506 (2009).

54.A.D.D. Dwivedi and P. Chakrabarti, “Sensitivity analysis of an HgCdTe based photovoltaic receiver for long- wavelength free space optical communication systems” Optoelectronics Letters, Vol.5, pp. 21-25, (2009).

55.Arun Kumar Singh, Rajiv Prakash, A. D. D. Dwivedi and P. Chakrabarti, “Electronic Properties and Junction Behaviour of Polyanthranilic Acid / Metal Contacts.” IEEE Electron Device Letter, Vol. 29, no.6, pp. 571-574, (2008).

56.Arun Kumar Singh, Rajiv Prakash, A. D. D. Dwivedi and P. Chakrabarti, “Electronic Properties and Junction Behaviour of Micro and Nanometer Sized Polyanthranilic Acid / Metal Contacts.” Synthetic Metals, Vol. 158, pp.939-945, (2008).

57.A.D.D. Dwivedi and P. Chakrabarti, “Modeling and Analysis of Photoconductive Detectors based on Hg1-xCdxTe for free Space Optical Communication.” Optical and Quantum Electronics, Vol. 39, pp. 627-641, 2007.

Slivaco White paper: Arun Dwivedi, Qingda Zhao, Mark Polito, Michel Blanchette, "Process and Device Simulation, Model Extraction and Circuit Simulation of Hybrid CMOS-like Inverters Using a-Si:H and Pentacene TFTs" Silvaco White paper January 2014.

Book Chapters:

Invited Talks:

Invited Talks/Keynote Speech:

1. A D D Dwivedi "Polymer electronics and development of new models for organic display and photovoltaic devices using Silvaco tools" in Indo- US International Conference on Polymers for Packaging Applications (ICPPA 2012) 31st March-2nd April 2012, Kottayam, Kerala, India.

2. A D D Dwivedi, "Compact modeling using Smart Spice verilog-A interface" in INUP-2012 at IISc. Banglore, April 2012.

3. A D D Dwivedi, "Study of low dimensional structures and devices using Silvaco TCAD and EDA tools" 2nd World congress on nano science and Technology (Nano S & T 2012) to be held during 26-27 October, 2012, Quingdao China.

4. A. D. D. Dwivedi, R. D'Esposito, A. K. Sahoo, S. Fregonese and T. Zimmer "Electro-thermal modeling of Self-heating and thermal Coupling in SiGe Multi-Finger HBTs" in First International Conference on Advanced Materials for Power Engineering (ICAMPE-2015) 11-13 December 2015, held at Mahatma Gandhi University, Kottayam, Kerala, India.

5. A D D Dwivedi, Isha Yadav and Govind Sharma, "Modeling and Numerical Simulation of Graphene Based FET" in 6th Annual World Congress on Nano Science and Technology-2016 (Nano S& T-2016) to be held in Singapore, during October 26-28, 2016.

6. A D D Dwivedi, Nidhi Sinha, Varun Chandra, "Numerical Simulation and performance optimization of n-ZnO/p-Si Heterojunction Solar Cell" in Second International Conference on Advanced Materials for Power Engineering (ICAMPE-2016), 11-13 November 2016, to be held at Mahatma Gandhi University, Kottayam, Kerala, India.

7. A D D Dwivedi,"Photodetectors for optical communication" The EMN Optical Communications Meeting will take place at United Arab Emirates Dubai during the week of November 13-17, 2016.

8. A. D. D. Dwivedi "Self heating and Mutual thermal coupling in semiconductor devices (SiGe HBTs and GaN HEMTs)" National seminar on “Recent Advances and Challenges Faced in GaN HEMT Technology” on August 19, 2017, PEC University of Technology Chandigarh.

9. A. D. D. Dwivedi "Towards TCAD modeling and universal compact modeling of Organic Thin Film Transistors" in one week FDP on "Emerging Trends in Nano Scale Devices and Circuits" at MNIT-Jaipur from April 2- April 6, 2018.

10. A. D. D. Dwivedi "Numerical Simulation and Compact modeling of Organic Thin Film Transistors for future Flexible Electronics" in Faculty Development Programme on “Recent Advances in VLSI and Embedded System” sponsored by Dr. A. P. J. Abdul Kalam Technical University (AKTU), Lucknow from 4th June to 8th June 2018 at VGI, Ghaziabad.

11. A. D. D. Dwivedi "Overview of Organic Electronics: Materials, Processing, Devices and their Applications” in the TEQIP –III sponsored Faculty Development Program on “ Emerging Trends in Organic Electronics (ETOE-2020)” held during 27th to 29th July 2020 organized by Rajasthan Technical University, Kota along with Swami Keshvanand Institute of Technology and Management, Jaipur.

Conference / Seminar Proceedings:

1. Dadhich, S., Dwivedi, A.D.D., Mathur, G, “Numerical Simulation and Analytical Modelling of C8-BTBT-C8 Organic Transistor and Analysis of Semiconductor Thickness.” Lecture Notes series in Electrical Engineering , Intelligent Computing Techniques for Smart Energy Systems Vol. 862, pp 669–680, 2022, https://doi.org/10.1007/978-981-19-0252-9_60 .

2. Dadhich, S., Dwivedi, A.D.D., Mathur, G, “Surface Charge Based Modeling of TIPS-Pentacene TFT” 2021 8th International Conference on Smart Computing and Communications: Artificial Intelligence, AI Driven Applications for a Smart World, ICSCC 2021, 2021, pp. 303–307.

3. Dadhich, S., Mathur, G., Dwivedi, A.D.D. “Mobile Charge Carrier Based Modeling of 4H-21 DNTT and Structure Analysis of OTFT” 2021 IEEE 2nd International Conference on Technology, Engineering, Management for Societal Impact using Marketing, Entrepreneurship and Talent, TEMSMET 2021, 2021.

4. S. S. Soley and A. D. D. Dwivedi " Advances in high efficiency crystalline silicon homo junction solar cell technology" INTERNATIONAL CONFERENCE ON “MULTIDIMENSIONAL ROLE OF BASIC SCIENCE IN ADVANCED TECHNOLOGY” ICMBAT 2018, published in AIP Conference Proceedings 2104, 030033 (2019); https://doi.org/10.1063/1.5100460.

5. A. D. D. Dwivedi "Numerical Simulation and Compact Modeling of Low Power Organic Thin Film Transistors for Future Flexible Electronics" in National Conference on Advanced Nanomaterials and their Applications (ANA-2018), during 21-23 December-2018 at MNNIT Allahabad.

6. Jyotsana Sharma, Rahul Pandey and A. D. D. Dwivedi "Design and Device Characteristics Analysis of Triple Material Double Gate (TMDG) Strained Channel MOSFET" in IEEE international conference, ICRAIE-2018, during 22-25 November 2018.

7. Avinash Sharma, Sandeep Toshniwal, Rahul Pandey and A. D. D. Dwivedi "Analysis of Device Characteristics of Dual material Double gate Strained N-Channel MOSFET" 4th IEEE International Students’ Conference on Electrical, Electronics and Computer Science (SCEECS-2018), 24-25 February 2018, at Maulana Azad National Institute of Technology (MANIT) Bhopal, India.

8. Mahima Asthana, A D D Dwivedi "Metal Oxide Based Thin Film Transistors for Transparent and Flexible Electronics: Critical Review" presented in Technovation-2018, Technical paper and model contests at IEEE Student Branch Poornima University during 2-4 February 2018.

9. Mohammad Asif Iqbal, Arun Dev Dhar Dwivedi “Simulation And Optimization of Hybrid Energy System For Isolated Region” presented in Technovation-2018, Technical paper and model contests at IEEE Student Branch Poornima University during 2-4 February 2018.

10. Pooja Kumari, Sushil Kumar Jain, Amit Mahesh Joshi and A D D Dwivedi “Numerical Simulation and Characterization of Pentacene based Organic Thin Film Transistors with Top and Bottom Gate Configurations” in International Conference on “EMERGING TRENDS IN MATERIALS AND MECHANICAL ENGINEERING (ICETMM– 2018)” January 29-30, held at Poornima University Jaipur.

11. Pooja Kumari, Sushil Kumar Jain, Amit Mahesh Joshi and A D D Dwivedi “ Numerical Simulation and Parameter Analysis for Pentacene based Organic Thin Film Transistor with HfO2 Gate Dielectric ” in International Conference on “EMERGING TRENDS IN MATERIALS AND MECHANICAL ENGINEERING (ICETMM– 2018)” January 29-30, held at Poornima University Jaipur.

12. Pooja Kumari, A. D. D. Dwivedi "2D Numerical Simulation and Modeling of High Performance Pentacene Organic Thin Film Transistor based on Poly (3-Dodecylthiophene-2, 5-Diyl) Dielectric Layer" in IACIET 2017 2nd International Academic Conference on Innovation in Engineering & Technology (IACIET-2017).

13. Mohammad Asif Iqbal , Arun Dev Dhar Dwivedi “A Comparative Study of Microgrid Load Frequency Control Techniques with Incorporation of Renewable Energy” Published in International Conference on Recent Innovation and Trends in Engineering, Technology and Research (ICRITETR-2017) December 23-24, 2017, ISBN: 978-93-5291-761-7, pp 160-165.

14. A. D. D. Dwivedi, Raghvendra Dhar Dwivedi, Rajeev Dhar Dwivedi, Qingda Zhao, Kevin Chang and Poh Chin, “TCAD simulation and compact modeling of Organic Thin Film Transistors (OTFTs) for circuit simulation” in Society for Information display (SID), International Symposium, Seminar and Exibition, May 21-26, 2017, Los Angeles Convention Center Los Angeles, California, USA.

15. A. D. D. Dwivedi, Anjan Chakravorty, R. D'Esposito, A. K. Sahoo, S. Fregonese and T. Zimmer " Self-heating and thermal coupling in SiGe multi-finger HBTs" in HiCUM Workshop-(2015), held at Boeblingen, Germany.

16. A. D. D. Dwivedi, R. D'Esposito, A. K. Sahoo, S. Fregonese and T. Zimmer " A study on self-heating and mutual thermal coupling in SiGe multi-finger HBTs " in International Semiconductor Science and Technology Conference (ISSTC 2015) held in Kusadasi Turkey (11–13 May 2015 | Sea Light Resort Hotel in Kuşadası, Turkey).

17. A. D. D. Dwivedi, S. Fregonese, J. D. Aguirre-Morales and T. Zimmer " 2D-Device simulation of Graphene transistors using the SENTAURUS simulator " in International Semiconductor Science and Technology Conference (ISSTC 2015) held in Kusadasi Turkey (11–13 May 2015 | Sea Light Resort Hotel in Kuşadası, Turkey).

18. J. D. Aguirre-Morales, S. Fregonese, A. D. D. Dwivedi, T. Zimmer, M. S. Khenissa and H. Happy "Towards Amplifier Design with a SiC Graphene Field-Effect Transistor" in 2015 Joint International EUROSOI Workshop and International Conference on Ultimate Integration on Silicon (EUROSOI-ULIS-2015), January 26-28, 2015 - held at Bologna, Italy.

19. A. D. D. Dwivedi, “Organic Photovoltaics: history, status and future,” in National workshop cum conference on Recent Development in Engineering Materials, held at Department of Applied Physics, BIT, Mesra Ranchi, India, 12-14 May 2011.

20. Ghusoon M. Ali, A. D.D. Dwivedi, S. Singh, and P. Chakrabarti “Interface properties and junction behavior of Pd contact on ZnO thin film grown by vaccum deposition technique.” in the proceedings of the 12th International Conference on the Formation of Semiconductor Interfaces (ICFSI-12) at Weimar, Germany, during 5-10 July, 2009.

21. A. D. D. Dwivedi, Arun Kumar Singh, Rajiv Prakash and P. Chakrabarti, “A Comparative Study of Polyanthranilic Acid (PANA)/Metal and Polycarbarzale (PCz)/Metal Contacts for Electronic and Optoelectronic Applications,” 2nd National Workshop on Advance Optoelectronic Materials and Devices, AOMD-2008, held at centre for research in microelectronics, Department of Electronics Engineering, I T BHU, Varanasi-221005, pp. 56-64, during 22-24, December 2008.

22. A. D. D. Dwivedi and P. Chakrabarti, “Modeling and ATLAS Simulation of HgCdTe Based MWIR Photodetector for Free Space Optical Communication” in International Conference on Recent Advances in Microwave Theory and Applications, 2008 (MICROWAVE-2008), held at University of Rajasthan, Rajasthan, India, pp. 412-415, during 21-24 November, 2008.

23. A. D. D. Dwivedi and P. Chakrabarti, “Analytical Modeling, and ATLAS Simulation of an Hg1-xCdxTe (MCT) based Photoconductive Detectors for Free Space Optical Communication operating near 10.6 µm atmospheric window” in “Third International Conference on Optical and Optoelectronic Properties of Materials and Applications (ICOOPMA-2008)” held in Edmonton, Alberta, Canada during 20-25 July 2008.

24. A. D. D. Dwivedi, G. Gupta and P. Chakrabarti “Modeling and Atlas Simulation of HgCdTe Based Dual Band Photodetector for Free space Optical Communication” presented in International “Workshop on Recent Advances of Low Dimensional Structures and devices (WRALDSD-2008)” held in School of Physics and Astronomy, University of Nottingham, Nottingham U.K. during 7-9 April 2008.

25. Arun Kumar Singh, Rajiv Prakash, A. D. D. Dwivedi and P. Chakrabarti, “Ultra Low Noise Polyanthranilic Acid (PANA) /metal (Al, Ti) Schottky Contacts for UV Detection.” Proceedings of AOMD-2007, pp299-304, December 27-29, 2007.

26. A. D. D. Dwivedi and P. Chakrabarti, “An Ultra Low Noise Photoconductive Detectors based on Hg1-xCdxTe for Free Space Optical Communication operating near 10.6 µm.” Proceedings of AOMD-2007, pp293-298, December 27-29, 2007.

27. A. D. D. Dwivedi and P. Chakrabarti, “Sensitivity analysis of an HgCdTe based photovoltaic receiver for long- wavelength free space optical communication systems.” Proceedings of XXXIII OSI Symposium on Optics and optoelectronics, December 18-20, pp177-179, 2007.

28. A. D. D. Dwivedi and P. Chakrabarti, “Sensitivity analysis of an HgCdTe based photoconductive receiver for long-wavelength free space optical communication systems,” Proc. of IRMMW-THz 2007, held at Cardiff, U.K., September 2-7, 2007.

29. Ritu Singh, Surabhi Panda, A. D. D. Dwivedi and P. Chakrabarti, “Modeling and Simulation of Photoconductive Detectors based on Hg1-xCdxTe for Free Space Optical Communication.” Proc. of IRMMW-THz 2006, held at Shanghai Institute of Technical Physics, Shanghai, China, September 18-22, 2006.

30. Arun Kumar Singh, A. D. D. Dwivedi, P. Chakrabarti and Rajiv Prakash “Junction Properties of Schottky Contact Between Polycarbazole and Aluminum” Molecular /Organic Electronic devices (MOED-09), Amritsar, India during September 22-25, 2009.

31. Arun Kumar Singh, Rajiv Prakash, A. D. D. Dwivedi and P. Chakrabarti, “Junction properties of functionalized conducting polymer “polyanthranilic acid (PANA)/metal Schottky contacts” 25th Annual Meeting of the Polymer Processing society (PPS-25) Goa, India during March 1-5, 2009.

Additional conference attended but not presented any paper

1. Attended the training Workshop on Indian Nanoelectronics User Programme “INUP -2009” held at centre for excellence in nanoelectronics at IISc. Banglore, India, during, 24-25 April 2009.

2. Attended the International Conference on Emerging Trends in Electronic and Photonic Devices & Systems (ELECTRO-2009), Dec.22-24, 2009, held at IT-BHU Varanasi.

Work Carried Out During Ph. D. Period:

My research work basically includes modeling, simulation, analysis, fabrication and characterization of photodetectors for all optical applications including guided optical communication (optical fiber communication) and unguided free space optical communication systems in LWIR, MWIR and U.V.-visible regions. It also includes photodetectors for non telecommunication applications such as gas sensors and detection of toxic gases. Modeling and simulation includes, modeling and simulation of infrared photodetectors based on III-V alloys and II-VI alloys for guided optical fiber communication systems and unguided free space optical communication systems respectively. We have modeled different photodetector structures such as photoconductors, p-n photodiodes, p-i-n photodiodes for above applications. Particularly modeling and analysis of InGaAs based photodetectors for optical fiber communication and Hg1-xCdxTe based photodetectors for free space optical communication. For modeling and simulation we use ATLAS device simulator from Silvaco International in which we do virtual wafer fabrication via ATHENA tool of this software and we do device characterization by developing the program in DECKBUILD window of this software. We study the device in terms of its position dependent energy band diagram using BLAZE tool of ATLAS, Electrical characterization through ATLAS and optical characterization through LUMINOUS.

An analytical modeling of N+-InP/n0-In0.53Ga0.47As/p+-In0.53Ga0.47As p-i-n photodetector for guided optical communication has been carried out. The results obtained on the basis of our model have been compared and contrasted with the simulated results using ATLASTM and experimental results reported by others. The photodetector has been studied in respect of energy band diagram, electric field profile, doping profile, dark current, resistance area-product, quantum efficiency, spectral response, responsivity and detectivity by analytical method using closed form equations and also been simulated by using device simulation software ATLASTM from SILVACO® international. Then theoretical analysis of an Hg1-xCdxTe based photoconductive detector has been carried out for characterizing the device in respect of voltage responsivity, quantum efficiency, detectivity and noise equivalent power then its application to study the front end of the receiver for possible application in unguided optical communication in LWIR region in atmospheric window at 9.6µm. The model accounts for all the major recombination mechanisms (e.g., Radiative, Auger, and Shockley-Read-Hall types) including the effect of surface recombination at the interfaces. Subsequently an analytical modeling of p+-Hg0.78Cd0.22Te/n0-Hg0.78Cd0.22Te/CdZnTe, homojunction, P+-Hg0.69Cd0.31Te/n-Hg0.78Cd0.22Te/CdZnTe single heterojunction and N+-Hg0.69 Cd0.31Te /n0- Hg0.78 Cd0.22Te/p+Hg0.78 Cd0.22Te p-i-n photodetectors have been carried out for long wavelength free space optical communication. The results obtained on the basis of our model have been compared and contrasted with the simulated results using ATLASTM from SILVACO® international.

Also fabrication and characterization of an organic photodetector (OPD) in the form of ITO coated glass/Polycarbazole (PCz)/Al Schottky contact has been carried out.The device has been subsequently characterized in respect of electrical and optical properties in order to explore its potential for possible use as a detector in the visible region at 650 nm.

In microelectronics lab we have performed fabrication and characterization of Schottky diode and LPG gas sensors based on Pd/ZnO Schottky contacts. We have also studied the front end receiver circuit based on some photodetectors proposed by us.

Worked on fabrication and characterization of U.V. and visible photodetectors and photovoltaic devices based on ZnO and organic semiconductor materials e.g. polyanthranilic acid (PANA), polycarbazole (PCz), PANA CNT and PCz CNT. So our focus is to explore the potential of organic and inorganic material for fabrication of devices for electronic and optoelectronic applications such as photodetectors, solar cells, LEDs, thin film transistors (TFTs), organic solar cells and organic light emitting diodes (OLEDS) based on organic materials e.g. polymers.