Thank you for visiting my webpage. I am working an assistant Professor at the Indian Institute of Technology Guwahati, Assam, India. Prior to joining IIT Guwahati, I served as a Development Engineer (Research) at AVANCIS GmbH, Germany from May 2023 to May 2024. I obtained my Ph.D. in Nanoelectronics at the Technical University of Munich, Germany. After my PhD, I worked as a Postdoctoral researcher at the University of Luxembourg. I have expertise in drift-diffusion and optoelectronic simulations of nanoelectronics devices, Soalr Cells, LEDs, Transistors, Thermoelectric Nanowires, and Quantum Structures. Along with simulations, I have experience in fabrication and characterization of inorganic-organic hybrid perovskite-based solar cells and LEDs. My current research at IIT Guwahati focuses on developing hybrid perovskite solar cells for single junction and tandem photovoltaics.
Beyond my research work, I love teaching, traveling, poetry, blogging, and observing the behavioral aspects of humans as well as animals. Please feel free to check out my Hindi books compiling motivational https://amzn.in/d/3qSMo5S and Romantic poems https://amzn.in/d/fqm9O3P
Alma Mater
Ph.D. in Nanoelectronics (2017-2021): Technical University of Munich, Germany
M.Tech. in Optoelectronics and Optical Communication (2014-2016): Indian Institute of Technology Delhi (IIT Delhi), India
B.Tech. in Engineering Physics (2010-2014): Indian Institute of Technology Delhi (IIT Delhi), India
Schooling: Board of Secondary Education Rajasthan, India
ITI in Electrician (2005-2007): Technical Education Rajasthan, India.
Research Experiences
Assistant Professor, Indian Institute of Technology Guwahati, India (June 2024 -Present)
Development Engineer, AVANCIS GmbH, R&D unit Munich, Germany (May 2023-May 2024)
Postdoctoral researcher, University of Luxembourg, Luxembourg (July 2021-Mar 2023)
Ph.D. Scholar: Technical University of Munich, Germany (2017-2021)
Visiting Researcher: University of Rome Tor Vergata, Italy (2019, 2020)
Visiting researcher: Indian Institute of Technology Roorkee, India (2019)
Junior Research Fellow: Indian Institute of Science Bangalore, India (2016-2017)
Research assistant: IIT Delhi, India (2016)
Research Internee: Bharat Heavy Electricals Limited (BHEL), Gurgaon, India (2013) .
Poetry book
Title: नया सवेरा (Naya Savera)
Author : Ajay Singh
Edition : March 2024
ISBN : 978-8119251674
Pages : 59
Publisher : Rajmangal Prakashan
Language : Hindi
Genres : Poetry
Amazon: https://amzn.in/d/3qSMo5S
Poetry book
Title: प्रेमांजलि (Premanjali)
Authors: Trinetra Mukherjee & Ajay Singh
Edition: June 2024
ISBN: 978-8119357543
Pages: 88
Publisher: MADHUSHALA PRAKASHAN PRIVATE LIMITED
Language: Hindi
Genres: Poetry
Amazon: https://amzn.in/d/4dfM6cq
Research work outcomes
Journal Publications
16. H. Phirke, S. Gharabeiki, A. Singh, A. Krishna, S. Siebentritt & A. Redinger. Quantifying recombination and charge carrier extraction in halide perovskites via hyperspectral time-resolved photoluminescence imaging. APL Energy, 016111, 2 (1), 2024. https://doi.org/10.1063/5.0188166
15. J. Hieulle, A. Krishna, A. Boziki, J. N. Audinot, M. U. Farooq, J. F. Machado, M. M., H. Phirke, A. Singh, ... & A. Redinger. Understanding and decoupling the role of wavelength and defects in light-induced degradation of metal-halide perovskites. Energy and Environmental Science, 284-295, 17, 2024. https://doi.org/10.1039/D3EE03511E
14. A. Krishna, V. Škorjanc, M. Dankl, J. Hieulle, H. Phirke, A. Singh, ... & A. Hagfeldt. Mitigating the Heterointerface Driven Instability in Perovskite Photovoltaics. ACS Energy Letters, 3604-3613, 8 (8), 2023. https://doi.org/10.1021/acsenergylett.3c01029
13. A. Singh, J. Hieulle, J. F. Machado, S Gharabeiki, W. Zuo, M. U. Farooq, H. Phirke, M. Saliba, and A. Redinger. Coevaporation stabilizes tin based perovskites in a single Sn-oxidation state. Nano Letters, 7112-7118, 22(17), 2022. https://doi.org/10.1021/acs.nanolett.2c02204
12. W. Kaiser, K. Hussain, A. Singh, ... & F. D. Angelis. Defect Formation and Healing at Grain Boundaries in Lead-Halide Perovskites. Journal of Materials Chemistry A, 24854-24865, 10, 2022. http://dx.doi.org/10.1039/D2TA06336K
11. S. Siebentritt, U. Rau, S. Gharabeiki, T. P. Weiss, A. Prot, T. Wang, D. Adeleye, M. Drahem and A. Singh. Photoluminescence assessment of materials for solar cell absorbers. Faraday Discussions, 112-129, 239, 2022. https://doi.org/10.1039/D2FD00057A
10. A. Singh, F. Matteocci, H. Zhu, D. Rossi, S. Mejaouri, S. Cacovich, M. A. D. Maur, F. Sauvage, A. Gagliardi, M. Grätzel, and A. D. Carlo. Methylamine gas treatment affords improving semi-transparency, efficiency and stability of CH3NH3PbBr3-based perovskite solar cells. Solar RRL 2100277, 5(9), 2021. DOI: https://doi.org/10.1002/solr.202100277
9. A. Singh and T. Mukherjee. Application of carotenoids in sustainable energy and green electronics. Materials Advances, 1341-1358, 3, 2022. DOI: https://doi.org/10.1039/D1MA01070K
8. A. Singh and A. Gagliardi. Device simulation of all-perovskite four-terminal tandem solar cells: Towards 33% of efficiency. EPJ Photovoltaics 12(4), 2021. https://doi.org/10.1051/epjpv/2021004
7. A. Singh, W. Kaiser, and A. Gagliardi. Role of cation-mediated recombination in perovskite solar cells. Solar Energy Materials and Solar Cells, 110912, 221, 2021. DOI: https://doi.org/10.1016/j.solmat.2020.110912
6. L. Canil, T. Cramer, B. Fraboni, D. Ricciarelli, D. Meggiolaro, A. Singh, ... & A. Abate. Tuning Halide Perovskite Energy Levels. Energy & Environmental Science, 1429-1438, 14(3), 2021. DOI: https://doi.org/10.1039/D0EE02216K
5. B. S. Vikram, R. Prakash, K.P. Nagarajun, A. Singh, S. K. Selvaraja, and V. R. Supradeepa. generation of multi-wavelength source spanning the entire c-band by nonlinear spectral broadening of dual-carrier electro-optic frequency combs. OSA Continuum, 2185, 3(8), 2020. DOI: https://doi.org/10.1364/OSAC.401107
4. K. P. Nagarajun, B. S. Vikram, R. Prakash, A. Singh, S. K. Selvaraja, and V. R. Supradeepa. Optical frequency comb based on nonlinear spectral broadening of a phase modulated comb source driven by dual offset locked carriers. Optics Letters, 893-896, 45(4), 2020. DOI: https://doi.org/10.1364/OL.381319
3. A. Singh and A. Gagliardi. Efficiency of all-perovskite two-terminal tandem solar cells: A drift-diffusion study. Solar Energy, 39–46, 187, 2019. DOI: https://doi.org/10.1016/j.solener.2019.05.006
2. A. Singh, E. Radicchi, S. Fantacci, F. Nunzi, F. De Angelis, and A. Gagliardi. Interface electrostatics of solid-state dye-sensitized solar cells: A joint drift-diffusion and density functional theory study. The Journal of Physical Chemistry C, 14955-14963, 123(24), 2019. DOI: https://doi.org/10.1021/acs.jpcc.9b03658
1. P.K. Kanaujia, A. Singh, and G. V. Prakash. Silicon‐based inorganic-organic hybrid nanocomposites for optoelectronic applications. Energy Technology, 1795-1799, 5(10), 2017. DOI: https://doi.org/10.1002/ente.201700355
Conferences papers
2. A. Singh and A. Gagliardi. Role of ion-assisted recombination and grain boundaries in perovskite solar cell hysteresis and efficiency. In 2020 IEEE 20th International Conference on Nanotechnology (IEEE-NANO), pages 227–232. IEEE, 2020. DOI: https://doi.org/10.1109/NANO47656.2020.9183602
1. K. P. Nagarjun, B. S. Vikram, R. Prakash, S. Suparna, A. Singh, S. K. Selvaraja, and V. R. Supradeepa. Frequency offset locked dual-carrier excitation of phase-modulated electro-optic frequency combs for bandwidth scaling and nonlinear spectral broadening. In Proc. SPIE 10561, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VII. page 1056109. SPIE, 2018. DOI: https://doi.org/10.1117/12.2290148
Conference presentations
10. J. Hieulle, M. U. Farooq, J. A. F. Machado, A. Singh, A. Krishna, A. Hagfeldt and A. Redinger. Intrinsic Light Instabilities in Metal Halide Perovskites. In 2022 MRS Fall Meeting, Oral Presentation, Boston, USA, 26 Nov -1 Dec 2022. https://www.mrs.org/docs/default-source/meetings-events/fall-meetings/2022/f22-program-final.pdf?sfvrsn=8bdc60e_2
9. A. Singh, J. Hieulle, H. Phirke, S. Gharabeiki, M. U. Farooq, R. Ahmed, J. A. F. Machado, S. Siebentritt, and A. Redinger. Synthesis and characterization of CH3NH3SnI3 films: A path towards stable lead-free perovskite solar cells. In Pace Young Scientist Conference 2022, Oral Presentation, Luxembourg, Luxembourg, 10-12 Oct 2022.
8. A. Singh, J. Hieulle, H. Phirke, J. A. F. Machado, S. Gharabeiki, R. Ahmad, S. Siebentritt and A. Redinger. Sn4+-free, stable tin perovskite films for lead-free perovskite solar cells. In 49th IEEE Photovoltaic Specialists Conference (PVSC 49), Oral presentation, Philadelphia, USA, 5-10 June 2022. https://doi.org/10.1109/PVSC48317.2022.9938891
7. H. Phirke, A. Singh, J. Hieulle, A Redinger and A. Krishna. Inhomogeneities in lead halide perovskite absorbers revealed by quantitative Photoluminescence Imaging. In International Conference on Hybrid and Organic Photovoltaics (HOPV22), Oral presentation, València, Spain, 19-25 May 2022. https://doi.org/10.29363/nanoge.hopv.2022.073
6. A. Singh, and A. Gagliardi. Role of Ionic-Assisted Recombination and Grain Boundaries in Perovskite Solar Cell Hysteresis and Efficiency. In IEEE 20th International Conference on Nanotechnology (IEEE-NANO: Virtual), Oral presentation, Montreal, Canada, Jul. 2020. https://doi.org/10.1109/NANO47656.2020.9183602
5. A. Singh, E. Radicchi, S. Fantacci, F. Nunzi, F. De Angelis, and A. Gagliardi. Investigation of interface electrostatics of solid-state dye-sensitized solar cells. In 2nd Dyenamo DSSC Conference, Oral presentation, Uppsala, Sweden, 14-15 October 2019. https://mediatum.ub.tum.de/1525925
4. A. Singh and A. Gagliardi. Drift-diffusion and machine learning for high efficiency perovskite-perovskite based tandem solar cells. In International Conference on Hybrid and Organic Photovoltaics (HOPV), Poster presentation, Rome, Italy, May 2019. https://www.nanoge.org/proceedings/HOPV19/5c35fb65c551940ccd2f4349
3. A. Gagliardi, A. Singh and W. Kaiser. Simulation of ion migration in perovskite solar cells using a Kinetic Monte Carlo/Drift-diffusion numerical model and analysis of the impact on device performance. In International Conference on Hybrid and Organic Photovoltaics (HOPV), Oral presentation, Oral presentation, Benidorm, Spain, May 2018. https://doi.org/10.29363/nanoge.hopv.2022.124
2. K. P. Nagarjun, B. S. Vikram, R. Prakash, S. Suparna, A. Singh, S. K. Selvaraja, and V. R. Supradeepa. Frequency offset locked dual-carrier excitation of phase-modulated electro-optic frequency combs for bandwidth scaling and nonlinear spectral broadening. In Proc. SPIE 10561, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VII, Oral presentation, San Francisco, United States, January 2018. https://doi.org/10.1117/12.2290148
1. A. Singh, M. Gupta, and D.S. Mehta. Solar pumped Nd:YAG laser systems. In International Conference on Light and Light-Based Technologies (ICLLT), Oral presentation: ICL2T/2016/092, Tezpur, Assam, India, November 2016.
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