Publications

- Research Articles -

Representative Research achievement:  Small, 2311362

The redox reaction and non-radiative recombination at the interface of the perovskite and NiOx reduce chemically by using interface modifier Zn3N2 to reduce hydroxyl group and defects on the surface of NiOx. A thin layer of Zn3N2 at the NiOx/perovskite interface results in a high Ni3+/Ni2+ ratio and a significant work function (WF), which inhibits the redox reaction and provides a highly aligned energy level with perovskite crystal and rigorous trap-passivation ability. Consequently, Zn3N2-modified NiOx-based PSCs achieve a champion PCE of 21.61%, over the NiOx-based PSCs. After Zn3N2 modification, the PSC can improve stability under several conditions.   

2023


Enhancing the Stability and Efficiency of Inverted Perovskite Solar Cells with a Mixed Ammonium Ligands Passivation Strategy

HJ Lee, YJ Kang, SN Kwon, DH Kim, SI Na

Small Methods, 2300948


Locally Supersaturated Inks for a Slot‐Die Process to Enable Highly Efficient and Robust Perovskite Solar Cells

SS Sangale, SN Kwon, P Patil, HJ Lee, SI Na

Advanced Energy Materials 13 (33), 2300537


Chemical Bridge-Mediated Heterojunction Electron Transport Layers Enable Efficient and Stable Perovskite Solar Cells

P Patil, A Maibam, SS Sangale, DS Mann, HJ Lee, S Krishnamurty, ...

ACS Applied Materials & Interfaces


Innovative Approaches to Semi-Transparent Perovskite Solar Cells

P Patil, SS Sangale, SN Kwon, SI Na

Nanomaterials 13 (6), 1084


Enhancing the efficiency and stability of pin triple cation perovskite solar cells using benzyl cyanoacetate passivation agent

CS Kim, HJ Lee, SN Kwon, SI Na

Applied Surface Science 611, 155640


Revivification of nickel oxide-perovskite interfaces via nickel nitrate to boost performance in perovskite solar cells

DS Mann, SN Kwon, P Patil, SI Na

Nano Energy 106, 108062


Oxysalt based synergistic dual interfacial engineering for high performance p–i–n structured perovskite solar cells

P Patil, SN Kwon, SS Sangale, DS Mann, SI Na

Journal of Materials Chemistry A 11 (48), 26636-26648


Representative Research achievement:  Advanced Energy Materials 13 (33), 2300537

This study introduces for the first time a rheological engineering-based locally supersaturated perovskite ink (LSPI) strategy for slot-die process-based PSC fabrication suitable for roll-to-roll continuous processes. Here, for the greenable slot-die process, a perovskite precursor ink composed of a low-toxic dimethyl sulfoxide (DMSO) single solvent is used and a small amount of 1,2-dichlorobenzene (DCB) is utilized as a modulator to control the rheological properties of the ink. The addition of DCB lowers the high surface tension of the DMSO-based perovskite precursor ink to suit the slot-die process, enabling uniform wet film formation, and produces locally supersaturated colloids, i.e., perovskite seeds, that help growth into dense and large grains by heterogeneous nucleation with low Gibbs-free energy. 

Representative Research achievement:  Nano Energy 106, 108062

For the first time, it is found that a uniform and ultra-thin nickel nitride (NixN) layer can be formed on the NiOx surface through the spin coating of the nickel nitrate solution at low temperatures. Promisingly, this new approach allows to overcome interface losses originating from defect sites and hydroxyl groups on the NiOx surface and to achieve high efficiency and long-term operational stability in PSCs. 

2022

 

Thermally and Air Stable Perovskite Solar Cells with a Hole Transporting PTAA/NiO Bilayer

YS Lee, SN Kwon, SI Na, D Kim, SW Kim

Applied Sciences 12 (24), 12888


Investigation of PCBM/ZnO and C60/BCP-based electron transport layer for high-performance pin perovskite solar cells

HJ Lee, SI Na

Journal of Alloys and Compounds 921, 166007


Temperature-controlled slot-die coating for efficient and stable perovskite solar cells

YH Seo, SP Cho, HJ Lee, YJ Kang, SN Kwon, SI Na

Journal of Power Sources 539, 231621


More effective perovskite surface passivation strategy via optimized functional groups enables efficient pin perovskite solar cells

SP Cho, HJ Lee, YJ Kang, YH Seo, SI Na

Applied Surface Science, 154248


Effects of heterofunctional alkali-metal formate doping on perovskite solar cell performance

S Thakur, SN Kwon, DS Mann, SI Na

Journal of Materiomics


Multi-site passivation-based antisolvent additive engineering with gradient distribution for superior triple cation PIN perovskite solar cells

YJ Kang, SI Na

Nano Energy 97, 107193


Multi-functional cyclic ammonium chloride additive for efficient and stable air-processed perovskite solar cells

SP Cho, JC Shin, HJ Lee, M Lee, S Na, SS Kim

Journal of Power Sources 531, 231243


Efficient mixed-cation perovskite photovoltaic cells via additive-assisted slot-die deposition

HJ Lee, SI Na

Materials Research Bulletin 149, 111728


Performance improvement of slot-die-deposition based perovskite solar cells using diglycolic acid additives

HJ Lee, SI Na

Materials Letters 312, 131651


Slot-die processed perovskite solar cells: effects of solvent and temperature on device performances

HJ Lee, YH Seo, SS Kim, SI Na

Semiconductor Science and Technology 37 (4), 045007


Multifunctional passivation agents for improving efficiency and stability of perovskite solar cells: Synergy of methyl and carbonyl groups

SP Cho, HJ Lee, YH Seo, SI Na

Applied Surface Science 575, 151740


Efficient Slot-Die-Processed Perovskite Solar Cells With 3-Allyloxy-1, 2-Propanediol Additive

HJ Lee, YJ Kang, SN Kwon, SI Na

IEEE Journal of Photovoltaics 12 (2), 634-638

Representative Research achievement:  Nano Energy 97, 107193

Here, to confirm the effects of functional groups, the four acrylate-based molecules that contain carbonyl (CO), hydroxyl (–OH), alkoxy (–O–CH2), or aromatic functional group are used as additives for antisolvent additive engineering (AAE). We then systematically investigate the effects of the passivation molecules on perovskite films and devices.  

2021


Ultra-stable all-inorganic silver bismuth sulfide colloidal nanocrystal photovoltaics using pin type architecture

JT Oh, SY Bae, J Yang, SR Ha, H Song, CB Lee, S Shome, S Biswas, ...

Journal of Power Sources 514, 230585


Enhanced Performance of Perovskite Solar Cells via Reactive Post‐treatment Process Utilizing Guanidine Acetate as Interface Modifier

P Patil, DS Mann, SR Rondiya, NY Dzade, SN Kwon, SI Na

Solar RRL 5 (11), 2100547


Synthesis and Photovoltaic Properties of Benzotrithiophene-Based Polymer/Non-fullerene Solar Cells

H Kim, DS Choi, SI Na, K Zong

Journal of Electronic Materials 50 (11), 6363-6371


Enhanced performance of pin perovskite solar cell via defect passivation of nickel oxide/perovskite interface with self-assembled monolayer

DS Mann, P Patil, SN Kwon, SI Na

Applied Surface Science 560, 149973


Ultrathin ternary metal oxide Bi2MoO6 nanosheets for high performance asymmetric supercapacitor and gas sensor applications

UT Nakate, P Patil, YT Nakate, SI Na, YT Yu, YB Hahn

Applied Surface Science 551, 149422


Fabrication and enhanced carbon monoxide gas sensing performance of p-CuO/n-TiO2 heterojunction device

UT Nakate, P Patil, SI Na, YT Yu, E Suh, YB Hahn

Colloids and Surfaces A: Physicochemical and Engineering Aspects 612, 125962


Direct surface functionalization of transparent carbon nanosheet electrodes for organic photovoltaics

SY Son, SL Yang, S Lee, SI Na, HI Joh

Materials Letters 283, 128777


Highly-dispersible reduced graphene oxide/polymer nanocomposites as efficient hole-transporting materials for perovskite solar cells

SP Cho, G Han, YH Seo, YJ Noh, JY Sohn, IT Hwang, J Shin, CH Jung, ...

Composites Science and Technology 201, 108548

2020


Eco-friendly cellulose-derived transparent carbon nanosheet electrodes

SY Son, SL Yang, S Lee, SI Na, HI Joh

Materials Research Bulletin 132, 110999


Boron nitride-incorporated NiOx as a hole transport material for high-performance pin planar perovskite solar cells

DS Mann, P Patil, DH Kim, SN Kwon, SI Na

Journal of Power Sources 477, 228738


In situ TEM observation of the heat–induced degradation of single–and triple–cation planar perovskite solar cells

YH Seo, JH Kim, DH Kim, HS Chung, SI Na

Nano Energy 77, 105164


Hybrid interfacial ETL engineering using PCBM-SnS2 for High-Performance pin structured planar perovskite solar cells

P Patil, DS Mann, UT Nakate, YB Hahn, SN Kwon, SI Na

Chemical Engineering Journal 397, 125504


Enhanced Device Performances of MAFACsPb(IxBr1–x) Perovskite Solar Cells with Dual-Functional 2-Chloroethyl Acrylate Additives

SP Cho, SN Kwon, MJ Choi, YH Seo, SS Kim, SI Na

ACS Applied Materials & Interfaces 12 (41), 46846-46853


Antisolvent additive engineering containing dual-function additive for triple-cation p–i–n perovskite solar cells with over 20% PCE

YJ Kang, SN Kwon, SP Cho, YH Seo, MJ Choi, SS Kim, SI Na

ACS Energy Letters 5 (8), 2535-2545


Non-Fullerene Small Molecule Electron-Transporting Materials for Efficient pin Perovskite Solar Cells

DS Choi, SN Kwon, SI Na

Nanomaterials 10 (6), 1082


Functional additives for high-performance inverted planar perovskite solar cells with exceeding 20% efficiency: Selective complexation of organic cations in precursors

MJ Choi, YS Lee, IH Cho, SS Kim, DH Kim, SN Kwon, SI Na

Nano Energy 71, 104639


Semi-transparent perovskite solar cells with directly sputtered amorphous InZnSnO top cathodes for building integrated photovoltaics

JG Kim, JH Lee, SI Na, HH Lee, Y Kim, HK Kim

Organic Electronics 78, 105560


Efficient and stable planar perovskite solar cells with a PEDOT: PSS/SrGO hole interfacial layer

DS Mann, YH Seo, SN Kwon, SI Na

Journal of Alloys and Compounds 812, 152091

Representative Research achievement:  Nano Energy 71, 104639, ACS Energy Letters 5 (8), 2535-2545, Nano Energy 77, 105164


In this work, we attempt to improve the quality of the perovskite film using a functional additive in the perovskite antisolvent, which is known as antisolvent additive engineering (AAE). An AAE additive, 2-hydroxyethyl acrylate (HEA), that includes −OH and C═O functional groups is introduced into the antisolvent. Its effect on the perovskite film and devices is then systematically studied. 

2019


Efficient semi-transparent perovskite solar cells with a novel indium zinc tin oxide top electrode grown by linear facing target sputtering

YJ Noh, JG Kim, SS Kim, HK Kim, SI Na

Journal of Power Sources 437, 226894


A systematic approach to ZnO nanoparticle-assisted electron transport bilayer for high efficiency and stable perovskite solar cells

SN Kwon, JH Yu, SI Na

Journal of Alloys and Compounds 801, 277-284


Graphene quantum dots with nitrogen and oxygen derived from simultaneous reaction of solvent as exfoliant and dopant

GS Kang, S Lee, JS Yeo, ES Choi, DC Lee, SI Na, HI Joh

Chemical Engineering Journal 372, 624-630


Slot‐die and roll‐to‐roll processed single junction organic photovoltaic cells with the highest efficiency

J Lee, YH Seo, SN Kwon, DH Kim, S Jang, H Jung, Y Lee, ...

Advanced Energy Materials 9 (36), 1901805


Novel NIR-absorbing benzotrithiophene-based copolymers for organic photovoltaics

H Kim, MJ Choi, KH Song, SI Na, K Zong

European Polymer Journal 118, 651-660


Investigation of sol-gel and nanoparticle-based NiOx hole transporting layer for high-performance planar perovskite solar cells

YH Seo, IH Cho, SI Na

Journal of Alloys and Compounds 797, 1018-1024


Thin metal top electrode and interface engineering for efficient and air-stable semitransparent perovskite solar cells

HJ Lee, SP Cho, S Na, SS Kim

Journal of Alloys and Compounds 797, 65-73


Microstructure and chemical analysis data of polyurethane-silver nanoparticles/graphene nanoplates composite fibers

SW Kim, SN Kwon, SI Na

Data in brief 25, 104107


Efficient ITO-free semitransparent perovskite solar cells with metal transparent electrodes

SP Cho, S Na, SS Kim

Solar Energy Materials and Solar Cells 196, 1-8


Room temperature solution-processed Fe doped NiOx as a novel hole transport layer for high efficient perovskite solar cells

PS Chandrasekhar, YH Seo, YJ Noh, SI Na

Applied Surface Science 481, 588-596


Stretchable and electrically conductive polyurethane-silver/graphene composite fibers prepared by wet-spinning process

SW Kim, SN Kwon, SI Na

Composites Part B: Engineering 167, 573-581


Conductive carbon nanosheets prepared from brominated polystyrene through ion beam irradiation and carbonization

SW Kim, CH Jung, SN Kwon, SI Na

Radiation Physics and Chemistry 159, 6-11


Direct 3D Printing of Graphene Nanoplatelet/Silver Nanoparticle‐Based Nanocomposites for Multiaxial Piezoresistive Sensor Applications

SN Kwon, SW Kim, IG Kim, YK Hong, SI Na

Advanced Materials Technologies 4 (2), 1800500


High performance roll‐to‐roll produced fullerene‐free organic photovoltaic devices via temperature‐controlled slot die coating

SI Na, YH Seo, YC Nah, SS Kim, H Heo, JE Kim, N Rolston, ...

Advanced Functional Materials 29 (6), 1805825


Photonic organolead halide perovskite artificial synapse capable of accelerated learning at low power inspired by dopamine‐facilitated synaptic activity

S Ham, S Choi, H Cho, SI Na, G Wang

Advanced Functional Materials 29 (5), 1806646


Structural design considerations of solution-processable graphenes as interfacial materials via a controllable synthesis method for the achievement of highly efficient, stable …

JS Yeo, YH Seo, CH Jung, SI Na

Nanoscale 11 (3), 890-900


Efficient planar perovskite solar cells with a conjugated random terpolymer as a novel hole-transporting material

YH Seo, SM Bang, B Lim, SI Na

Dyes and Pigments 160, 930-935

Representative Research achievement:  Advanced Energy Materials 9 (36), 1901805 & Advanced Functional Materials 29 (6), 1805825


This paper reports a high power conversion efficiency (PCE) of 13.5% achieved with single-junction ternary PSCs based on PTB7-Th, PC71BM, and COi8DFIC fabricated by slot-die coating, which shows the highest PCE ever reported in PSCs fabricated by a scalable process. To understand the origin of the high performance of the slot-die coated device, slot-die coated photoactive films and devices are systematically investigated.  

2018


Flexible and transparent IWO films prepared by plasma arc ion plating for flexible perovskite solar cells

JG Kim, SI Na, HK Kim

AIP Advances 8 (10), 105122


Non-fullerene-based small molecules as efficient n-type electron transporting layers in inverted organic–inorganic halide perovskite solar cells

YJ Noh, JH Jeong, SS Kim, HK Kim, SI Na

Journal of industrial and engineering chemistry 65, 406-410


Statistical analyses on inverted perovskite solar cells employing non-fullerene-based small molecule as a cathode interfacial layer

YJ Noh, JH Jeong, SI Na

Data in brief 19, 1643-1646


Two-step brush-painted PEDOT: PSS electrodes for ITO-free organic solar cells

SS Kim, SP Cho, SI Na

Journal of industrial and engineering chemistry 62, 40-45


Hybrid materials of upcycled Mn3O4 and reduced graphene oxide for a buffer layer in organic solar cells

CH Lee, S Lee, JS Yeo, GS Kang, YJ Noh, SM Park, DC Lee, SI Na, ...

Journal of industrial and engineering chemistry 61, 106-111


High-performance polymeric photovoltaic cells with a gold chloride-treated polyacrylonitrile hole extraction interlayer

JH Jeong, YJ Noh, SS Kim, SN Kwon, SI Na

Semiconductor Science and Technology 33 (3), 035019


Hysteresis data of planar perovskite solar cells fabricated with different solvents

YH Seo, EC Kim, SP Cho, SS Kim, SI Na

Data in brief 16, 418-422

2017


High-performance planar perovskite solar cells: Influence of solvent upon performance

YH Seo, EC Kim, SP Cho, SS Kim, SI Na

Applied Materials Today 9, 598-604


Fogging, reflection, and dust-free transparent conducting glasses based on superhydrophilic nanotextures for organic photovoltaics

EC Kim, SI Na, JT Park

Journal of industrial and engineering chemistry 52, 243-250


Inverted Organic Solar Cells Fabricated with Room‐Temperature‐deposited Transparent Multilayer Electrodes

JH Kim, SN Kwon, SI Na, YZ Yoo, TY Seong

Bulletin of the Korean Chemical Society 38 (8), 856-860


Conductive PEDOT: PSS-coated poly-paraphenylene terephthalamide thread for highly durable electronic textiles

CM Choi, SN Kwon, SI Na

Journal of Industrial and Engineering Chemistry 50, 155-161


Thienopyrroledione and benzodithiophene/thiophene-based random terpolymer for polymer solar cells with improved fill factor

SM Bang, J Park, S Kang, YS Lee, B Lim, H Heo, J Lee, Y Lee, SI Na

Dyes and Pigments 140, 229-235


Electron Transport Layer-Free Inverted Organic Solar Cells Fabricated with Highly Transparent Low-Resistance Indium Gallium Zinc Oxide/Ag/Indium Gallium Zinc Oxide Multilayer …

JH Kim, SN Kwon, SI Na, SK Kim, YZ Yoo, HS Im, TY Seong

Journal of Electronic Materials 46 (4), 2140-2146


Investigations into inward positioned 3, 3′-Dihexylditheinylbenzothiadiazole (DTBTh)-Benzodithiophene (BDT) based polymer solar cells by controlling molecular weight and alkyl …

NJ Hong, YS Lee, JH Park, SI Na, JC Choe, K Zong

Organic Electronics 42, 293-302


Efficient spin-coating-free planar heterojunction perovskite solar cells fabricated with successive brush-painting

JW Lee, SI Na, SS Kim

Journal of power sources 339, 33-40


Work function control in carbon nanosheets via chloride-based metal precursors and their applications as transparent electrodes

HN Jo, SM Park, JS Yeo, SY Son, SI Na, S Lee, MH Lee, HI Joh

Journal of Industrial and Engineering Chemistry 45, 11-14


ITO-free polymer solar cells with vanadium oxide hole transport layer

DY Lee, SP Cho, SI Na, SS Kim

Journal of Industrial and Engineering Chemistry 45, 1-4


BIPV 적용을 위한 대면적 페로브스카이트 태양전지 기술

SN Gwon, DH Kim, SI Na

전기의세계 66 (10), 23-32


Photo-cross-linked perylene diimide derivative materials as efficient electron transporting layers in inverted polymer solar cells

YJ Noh, YJ Choi, JH Jeong, SS Kim, KU Jeong, SI Na

Nanoscale 9 (45), 17731-17736


Synergetic effects of solution-processable fluorinated graphene and PEDOT as a hole-transporting layer for highly efficient and stable normal-structure perovskite solar cells

JH Yu, CH Lee, HI Joh, JS Yeo, SI Na

Nanoscale 9 (44), 17167-17173


ZnO films using a precursor solution irradiated with an electron beam as the cathode interfacial layer in inverted polymer solar cells

R Kang, YJ Noh, JM Yun, H Kim, NS Myoung, EH Lee, TW Kim, SI Na, ...

RSC advances 7 (43), 26689-26696


A novel random terpolymer for high-efficiency bulk-heterojunction polymer solar cells

SM Bang, S Kang, YS Lee, B Lim, H Heo, J Lee, Y Lee, SI Na

RSC advances 7 (4), 1975-1980


Polyacrylonitrile-grafted reduced graphene oxide hybrid: An all-round and efficient hole-extraction material for organic and inorganic-organic hybrid photovoltaics

CH Jung, YJ Noh, JH Bae, JH Yu, IT Hwang, J Shin, K Shin, JS Lee, ...SI Na

Nano Energy 31, 19-27


Diketopyrrolopyrrole-Based Metallated Polymer for Bulk-Heterojunction Solar Cells and Organic Field-Effect Transistors

JM Yun, D Khim, SH Oh, HB Kim, PH Kang, DY Kim, SI Na

Journal of Nanoscience and Nanotechnology 17 (1), 530-537


Transparent conductive ITO/Ag/ITO electrode deposited at room temperature for organic solar cells

JH Kim, TW Kang, SN Kwon, SI Na, YZ Yoo, HS Im, TY Seong

Journal of Electronic Materials 46 (1), 306-311

Representative Research achievement:  Nano Energy 31, 19-27


In this research, we demonstrate that aliphatic polyacrylonitrile-grafted reduced graphene oxide (PRGO) hybrid can function efficiently as an all-round hole-extraction layer (HEL) in organic and organic-inorganic hybrid perovskite photovoltaic devices (OPVs and PePVs). 

2016


Efficient planar heterojunction perovskite solar cells fabricated via roller-coating

SM Park, YJ Noh, SH Jin, SI Na

Solar Energy Materials and Solar Cells 155, 14-19


Random mesh-like Ag networks prepared via self-assembled Ag nanoparticles for ITO-free flexible organic solar cells

KW Seo, YJ Noh, SI Na, HK Kim

Solar Energy Materials and Solar Cells 155, 51-59


Tin doped indium oxide anodes with artificially controlled nano-scale roughness using segregated Ag nanoparticles for organic solar cells

HJ Kim, EH Ko, YJ Noh, SI Na, HK Kim

Scientific reports 6 (1), 1-11


Electron-beam-induced reduced graphene oxide as an alternative hole-transporting interfacial layer for high-performance and reliable polymer solar cells

SN Kwon, CH Jung, SI Na

Organic Electronics 34, 67-74


Blending of n-type Semiconducting Polymer and PC61BM for an Efficient Electron-Selective Material to Boost the Performance of the Planar Perovskite Solar Cell

YH Seo, JS Yeo, NS Myoung, SY Yim, M Kang, DY Kim, SI Na

ACS Applied Materials & Interfaces 8 (20), 12822-12829


Method of preparing reduced graphene oxide and reduced graphene oxide-polymer composites

BC Ku, OK Park, SH Lee, SI Na, HI Jo, JK Kim, JH Lee

US Patent 9,318,231


In-depth considerations for better polyelectrolytes as interfacial materials in polymer solar cells

JS Yeo, M Kang, YS Jung, R Kang, SH Lee, YJ Heo, SH Jin, DY Kim, ...SI Na

Nano Energy 21, 26-38


Enhanced performance of perovskite solar cells with solution-processed n-doping of the PCBM interlayer

JH Bae, YJ Noh, M Kang, DY Kim, HB Kim, SH Oh, JM Yun, SI Na

RSC advances 6 (69), 64962-64966


A feasible random copolymer approach for high-efficiency polymeric photovoltaic cells

YS Lee, JY Lee, SM Bang, B Lim, J Lee, SI Na

Journal of Materials Chemistry A 4 (29), 11439-11445


Graphene oxide/PEDOT: PSS composite hole transport layer for efficient and stable planar heterojunction perovskite solar cells

DY Lee, SI Na, SS Kim

Nanoscale 8 (3), 1513-1522

Representative Research achievement:  Nano Energy 21, 26-38


We perform a comprehensive study to achieve better polyelectrolytes (PEs) as electron-transport layers (ETLs) in polymer solar cells (PSCs). Three well-known PEs – PFN, PEIE, and WPF – are chosen as model systems and investigated with variations in their backbone structures and the state of the amine functionalities on their side chains. 

2015


Efficient PEDOT: PSS-free polymer solar cells with an easily accessible polyacrylonitrile polymer material as a novel solution-processable anode interfacial layer

YJ Noh, SM Park, JS Yeo, DY Kim, SS Kim, SI Na

ACS Applied Materials & Interfaces 7 (45), 25032-25038


Work function and interface control of amorphous IZO electrodes by MoO3 layer grading for organic solar cells

HJ Kim, KW Seo, YJ Noh, SI Na, A Sohn, DW Kim, HK Kim

Solar Energy Materials and Solar Cells 141, 194-202


2-Dimensional MoS2 nanosheets as transparent and highly electrocatalytic counter electrode in dye-sensitized solar cells: effect of thermal treatments

SS Kim, JW Lee, JM Yun, SI Na

Journal of Industrial and Engineering Chemistry 29, 71-77


Transparent and flexible amorphous InZnAlO films grown by roll-to-roll sputtering for acidic buffer-free flexible organic solar cells

DY Cho, KH Kim, TW Kim, YJ Noh, SI Na, KB Chung, HK Kim

Organic electronics 24, 227-233


Embedment of nano-sized Ag layer into Ag-doped In2O3 films for use as highly transparent and conductive anode in organic solar cells

DY Cho, SI Na, KB Chung, HK Kim

Applied Surface Science 347, 88-95


Metal chloride-treated graphene oxide to produce high-performance polymer solar cells

ES Choi, YJ Jeon, SS Kim, TW Kim, YJ Noh, SN Kwon, SI Na

Applied Physics Letters 107 (2), 67_1


Sequent spray deposition of secondary solvent for efficient polymer solar cells

BK Yu, D Vak, J Jo, SI Na, SS Kim, YS Jung, DY Kim

Macromolecular Research 23 (7), 696-703


ITO-free inverted organic solar cells fabricated with transparent and low resistance ZnO/Ag/ZnO multilayer electrode

JH Kim, TW Kang, SI Na, YZ Yoo, TY Seong

Current Applied Physics 15 (7), 829-832


Efficient modification of transparent graphene electrodes by electron beam irradiation for organic solar cells

SH Kim, YJ Noh, SN Kwon, BN Kim, BC Lee, SY Yang, CH Jung, SI Na

Journal of Industrial and Engineering Chemistry 26, 210-213


Effect of chemically converted graphene as an electrode interfacial modifier on device-performances of inverted organic photovoltaic cells

TW Kang, YJ Noh, JM Yun, SY Yang, YE Yang, HS Lee, SI Na

Semiconductor Science and Technology 30 (6), 065008


Efficient inverted-structure polymer solar cells with reduced graphene oxide for anode modification

TW Kang, YJ Noh, SS Kim, HI Joh, SI Na

Journal of Industrial and Engineering Chemistry 24, 206-210


Roll-to-roll sputtered Si-doped In2O3/Ag/Si-doped In2O3 multilayer as flexible and transparent anodes for flexible organic solar cells

DY Cho, YH Shin, HK Kim, YJ Noh, SI Na, KB Chung

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 33 (2 …


Highly efficient and stable planar perovskite solar cells with reduced graphene oxide nanosheets as electrode interlayer

JS Yeo, R Kang, S Lee, YJ Jeon, NS Myoung, CL Lee, DY Kim, JM Yun, ...SI Na

Nano Energy 12, 96-104


Morphological, optical, and electrical investigations of solution-processed reduced graphene oxide and its application to transparent electrodes in organic solar cells

JM Yun, CH Jung, YJ Noh, YJ Jeon, SS Kim, DY Kim, SI Na

Journal of Industrial and Engineering Chemistry 21, 877-883


Highly flexible and bendable carbon nanosheets as transparent conducting electrodes for organic solar cells

SY Son, JM Yun, YJ Noh, S Lee, HN Jo, SI Na, HI Joh

Carbon 81, 546-551


Fabrication of spray-printed organic non-volatile memory devices for low cost electronic applications

AN Cha, Y Ji, SA Lee, YY Noh, SI Na, S Bae, S Lee, TW Kim

Materials Science and Engineering: B 191, 51-56


Face-to-face transferred multicrystalline ITO films on colorless polyimide substrates for flexible organic solar cells

SB Kang, HJ Kim, YJ Noh, SI Na, HK Kim

Nano Energy 11, 179-188


Brush painted V2O5 hole transport layer for efficient and air-stable polymer solar cells

SP Cho, JS Yeo, DY Kim, S Na, SS Kim

Solar Energy Materials and Solar Cells 132, 196-203

Representative Research achievement:  Nano Energy 12, 96-104


We demonstrate a simple solution and room-temperature processed reduced graphene oxide (RGO) as a novel hole-transporting material (HTM) to guarantee highly efficient and highly stable CH3NH3PbI3 perovskite solar cells (PeSCs). 

2014


Efficient organic Schottky junction solar cells with a platinum chloride-treated PEDOT: PSS interfacial layer

K Hwang, JS Yeo, SS Kim, DY Kim, SI Na

Semiconductor Science and Technology 30 (1), 015014


An approach for an advanced anode interfacial layer with electron-blocking ability to achieve high-efficiency organic photovoltaics

JS Yeo, JM Yun, M Kang, D Khim, SH Lee, SS Kim, SI Na, DY Kim

ACS Applied Materials & Interfaces 6 (22), 19613-19620


Simple brush painted Ag nanowire network on graphene sheets for flexible organic solar cells

KW Seo, JH Lee, NG Cho, SJ Kang, HK Kim, SI Na, HW Koo, TW Kim

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 32 (6 …


High-performance polymer solar cells with radiation-induced and reduction-controllable reduced graphene oxide as an advanced hole transporting material

YJ Noh, SC Park, IT Hwang, JH Choi, SS Kim, CH Jung, SI Na

Carbon 79, 321-329


Preparation method for reduced graphene oxide using sulfonyl hydrazide-based reducing agent and optoelectronic devices thereof

SI Na, DY Kim, HY Koo, JM Yun, JS Yeo, JK Kim

US Patent 8,865,515


Acidic buffer-free organic solar cells using vanadium-doped indium oxide anodes

HM Lee, YJ Noh, SI Na, HK Kim

ECS Solid State Letters 3 (12), P145


Ag-Pd-Cu alloy inserted transparent indium tin oxide electrodes for organic solar cells

HJ Kim, KW Seo, HK Kim, YJ Noh, SI Na

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 32 (5 …


Highly transparent and flexible InTiO/Ag nanowire/InTiO films for flexible organic solar cells

KW Seo, JH Lee, HJ Kim, HK Kim, SI Na

Applied Physics Letters 105 (3), 031911


A facile approach to improve light extraction for organic light emitting diodes via azobenzene surface relief gratings

J Kim, H Park, SI Na, YY Noh, DY Kim

Japanese Journal of Applied Physics 53 (8S3), 08NF02


PEDOT: PSS-free organic solar cells fabricated on buffer and anode integrated Ta-doped In2O3 films

HM Lee, YJ Noh, SI Na, KB Chung, HK Kim

Solar energy materials and solar cells 125, 145-154


Exfoliated and Partially Oxidized MoS2 Nanosheets by One‐Pot Reaction for Efficient and Stable Organic Solar Cells

JM Yun, YJ Noh, CH Lee, SI Na, S Lee, SM Jo, HI Joh, DY Kim

Small 10 (12), 2319-2324


Effect of molecular desorption on the electronic properties of self-assembled polarizable molecular monolayers

G Wang, H Jeong, J Ku, SI Na, H Kang, E Ito, YH Jang, J Noh, T Lee

Journal of colloid and interface science 419, 39-45


Preparation of porous carbon nanofibers derived from graphene oxide/polyacrylonitrile composites as electrochemical electrode materials

HI Joh, HK Song, CH Lee, JM Yun, SM Jo, S Lee, SI Na, AT Chien, ...

Carbon 70, 308-312


Moderately reduced graphene oxide as hole transport layer in polymer solar cells via thermal assisted spray process

YJ Jeon, JM Yun, DY Kim, SI Na, SS Kim

Applied Surface Science 296, 140-146


Highly transparent Nb-doped indium oxide electrodes for organic solar cells

JH Kim, TY Seong, SI Na, KB Chung, HM Lee, HK Kim

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 32 (2 …


Transparent graphene oxide–Pt composite counter electrode fabricated by pulse current electrodeposition-for dye-sensitized solar cells

HS Jang, JM Yun, DY Kim, SI Na, SS Kim

Surface and Coatings Technology 242, 8-13


Brush-painted flexible organic solar cells using highly transparent and flexible Ag nanowire network electrodes

SB Kang, YJ Noh, SI Na, HK Kim

Solar energy materials and solar cells 122, 152-157


Characteristics of a ZnTiO and ITO cathode-integrated electrodes for inverted organic solar cells

SB Kang, YJ Noh, SI Na, HK Kim

Solar energy materials and solar cells 121, 85-91


Investigation into the effect of post-annealing on inverted polymer solar cells

R Kang, SH Oh, SI Na, TS Kim, DY Kim

Solar energy materials and solar cells 120, 131-135


Cost-effective ITO-free organic solar cells with silver nanowire–PEDOT: PSS composite electrodes via a one-step spray deposition method

YJ Noh, SS Kim, TW Kim, SI Na

Solar Energy Materials and Solar Cells 120, 226-230


Sulfonic acid-functionalized, reduced graphene oxide as an advanced interfacial material leading to donor polymer-independent high-performance polymer solar cells

JS Yeo, JM Yun, YS Jung, DY Kim, YJ Noh, SS Kim, SI Na

Journal of Materials Chemistry A 2 (2), 292-298


Fluorine-functionalized and simultaneously reduced graphene oxide as a novel hole transporting layer for highly efficient and stable organic photovoltaic cells

SH Kim, CH Lee, JM Yun, YJ Noh, SS Kim, S Lee, SM Jo, HI Joh, SI Na

Nanoscale 6 (13), 7183-7187


One-step synthesis of carbon nanosheets converted from a polycyclic compound and their direct use as transparent electrodes of ITO-free organic solar cells

B GakáKim...SI Na

Nanoscale 6 (2), 678-682

2013


Eco-friendly and simple radiation-based preparation of graphene and its application to organic solar cells

CH Jung, YW Park, IT Hwang, YJ Go, SI Na, K Shin, JS Lee, JH Choi

Journal of Physics D: Applied Physics 47 (1), 015105


Effect of sheet resistance of Ag-nanowire-based electrodes on cell-performances of ITO-free organic solar cells

YJ Noh, SS Kim, TW Kim, SI Na

Semiconductor science and technology 28 (12), 125008


Inverted polymer solar cells including ZnO electron transport layer fabricated by facile spray pyrolysis

YJ Noh, SI Na, SS Kim

Solar Energy Materials and Solar Cells 117, 139-144


Efficient ITO-free polymer solar cells with pitch-converted carbon nanosheets as novel solution-processable transparent electrodes

SI Na, JS Lee, YJ Noh, TW Kim, SS Kim, HI Joh, S Lee

Solar energy materials and solar cells 115, 1-6


Effect of Zr doping power on the electrical, optical and structural properties of In–Zr–O anodes for P3HT: PCBM thin-film organic solar cells

DY Cho, KB Chung, SI Na, HK Kim

Journal of Physics D: Applied Physics 46 (29), 295305


Successive solvent-treated PEDOT: PSS electrodes for flexible ITO-free organic photovoltaics

JS Yeo, JM Yun, DY Kim, SS Kim, SI Na

Solar energy materials and solar cells 114, 104-109


Brush painting of transparent PEDOT/Ag nanowire/PEDOT multilayer electrodes for flexible organic solar cells

JH Lee, HS Shin, YJ Noh, SI Na, HK Kim

Solar energy materials and solar cells 114, 15-23


Buffer and anode-integrated WO3-doped In2O3 electrodes for PEDOT: PSS-free organic photovoltaics

JH Kim, SB Kang, JH Lee, YH Shin, HS Shin, DG Kwon, TY Seong, Y Park, ...

Organic Electronics 14 (5), 1305-1312


Efficient polymer solar cells with a solution-processed gold chloride as an anode interfacial modifier

YJ Go, JM Yun, YJ Noh, JS Yeo, SS Kim, CH Jung, SH Oh, SY Yang, ...

Applied Physics Letters 102 (16), 70


Ag nanowire-embedded ITO films as a near-infrared transparent and flexible anode for flexible organic solar cells

KH Choi, J Kim, YJ Noh, SI Na, HK Kim

Solar energy materials and solar cells 110, 147-153


Transparent and flexible PEDOT: PSS electrodes passivated by thin IZTO film using plasma-damage free linear facing target sputtering for flexible organic solar cells

JH Lee, HS Shin, SI Na, HK Kim

Solar energy materials and solar cells 109, 192-198


Efficient organic solar cells with solution-processed carbon nanosheets as transparent electrodes

SI Na, YJ Noh, SY Son, TW Kim, SS Kim, S Lee, HI Joh

Applied Physics Letters 102 (4), 15


Efficient work-function engineering of solution-processed MoS 2 thin-films for novel hole and electron transport layers leading to high-performance polymer solar cells

JM Yun, YJ Noh, JS Yeo, YJ Go, SI Na, HG Jeong, J Kim, S Lee, SS Kim, ...

Journal of Materials Chemistry C 1 (24), 3777-3783

2012


Highly near-infrared transparent GeO2-doped In2O3 electrodes for bulk heterojunction organic solar cells

SB Kang, JW Lim, SI Na, HK Kim

Solar energy materials and solar cells 107, 373-380


Simple brush-painting of flexible and transparent Ag nanowire network electrodes as an alternative ITO anode for cost-efficient flexible organic solar cells

JW Lim, DY Cho, SI Na, HK Kim

Solar Energy Materials and Solar Cells 107, 348-354


Effect of MoO3 doping power on the electrical, optical, and structural properties of MoO3-doped In2O3 anodes for organic solar cells

YH Shin, HK Kim, SI Na

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 30 (6 …


Moderately reduced graphene oxide as transparent counter electrodes for dye-sensitized solar cells

HS Jang, JM Yun, DY Kim, DW Park, SI Na, SS Kim

Electrochimica Acta 81, 301-307


ITO-free flexible polymer solar cells with ink-jet-printed Ag grids

SI Na, DW Park, SS Kim, SY Yang, K Lee, MH Lee

Semiconductor Science and Technology 27 (12), 125002


Rapid thermal annealed WO {sub 3}-doped In {sub 2} O {sub 3} films for transparent electrodes in organic photovoltaics

JH Kim, TY Seong, YH Shin, HK Kim, SI Na

Journal of Physics. D, Applied Physics 45


Mechanical integrity of flexible Ag nanowire network electrodes coated on colorless PI substrates for flexible organic solar cells

JW Lim, DY Cho, K Eun, SH Choa, SI Na, J Kim, HK Kim

Solar Energy Materials and Solar Cells 105, 69-76


High-performance polymer solar cells with moderately reduced graphene oxide as an efficient hole transporting layer

YJ Jeon, JM Yun, DY Kim, SI Na, SS Kim

Solar Energy Materials and Solar Cells 105, 96-102


Organic photovoltaic devices with low resistance multilayer graphene transparent electrodes

Y Un Jung, SI Na, HK Kim, S Jun Kang

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 30 (5 …


Rapid thermal annealed WO3-doped In2O3 films for transparent electrodes in organic photovoltaics

JH Kim, YH Shin, TY Seong, SI Na, HK Kim

Journal of Physics D: Applied Physics 45 (39), 395104


Flexible organic solar cells composed of P3HT: PCBM using chemically doped graphene electrodes

S Lee, JS Yeo, Y Ji, C Cho, DY Kim, SI Na, BH Lee, T Lee

Nanotechnology 23 (34), 344013


Significant vertical phase separation in solvent-vapor-annealed poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) composite films leading to better conductivity and …

JS Yeo, JM Yun, DY Kim, S Park, SS Kim, MH Yoon, TW Kim, SI Na

ACS applied materials & interfaces 4 (5), 2551-2560


Effect of PEDOT: PSS–molecule interface on the charge transport characteristics of the large-area molecular electronic junctions

G Wang, SI Na, TW Kim, Y Kim, S Park, T Lee

Organic Electronics 13 (5), 771-777


In situ synthesis of thermochemically reduced graphene oxide conducting nanocomposites

OK Park, MG Hahm, S Lee, HI Joh, SI Na, R Vajtai, JH Lee, BC Ku, ...

Nano letters 12 (4), 1789-1793


Anatase TiO2 and ITO co-sputtered films for an indium-saving multicomponent electrode in organic solar cells

JW Lim, SI Na, HK Kim

Solar energy materials and solar cells 98, 409-416


All-solution-processed ITO-free polymer solar cells fabricated on copper sheets

TS Kim, SI Na, SH Oh, R Kang, BK Yu, JS Yeo, J Lee, DY Kim

Solar energy materials and solar cells 98, 168-171


Inkjet printing of transparent InZnSnO conducting electrodes from nano-particle ink for printable organic photovoltaics

J Kim, SI Na, HK Kim

Solar Energy Materials and Solar Cells 98, 424-432


Solution‐processible polymer solar cells fabricated on a papery substrate

TS Kim, SI Na, SS Kim, BK Yu, JS Yeo, DY Kim

physica status solidi (RRL)–Rapid Research Letters 6 (1), 13-15


Multilayer graphene films as transparent electrodes for organic photovoltaic devices

YY Choi, SJ Kang, HK Kim, WM Choi, SI Na

Solar Energy Materials and Solar Cells 96, 281-285

2011~2010 @ KIST


TiO2 nanotubes decorated with ZnO rod-like nanostructures for efficient dye-sensitized solar cells

SS Kim, SI Na, YC Nah

Electrochimica Acta 58, 503-509


Mechanical flexibility of transparent PEDOT: PSS electrodes prepared by gravure printing for flexible organic solar cells

CK Cho, WJ Hwang, K Eun, SH Choa, SI Na, HK Kim

Solar Energy Materials and Solar Cells 95 (12), 3269-3275


Solution‐processable reduced graphene oxide as a novel alternative to PEDOT: PSS hole transport layers for highly efficient and stable polymer solar cells

JM Yun, JS Yeo, J Kim, HG Jeong, DY Kim, YJ Noh, SS Kim, BC Ku, SI Na

Advanced Materials 23 (42), 4923-4928


Synthesis and Characterization of Poly (Dithieno [3, 2‐b: 2′, 3′‐d] pyrrole) Derivatives Containing Thiophene Moieties and Their Application to Organic Devices

HG Jeong, B Lim, SI Na, KJ Baeg, J Kim, JM Yun, DY Kim

Macromolecular Chemistry and Physics 212 (21), 2308-2318


Investigation of the transition voltage spectra of molecular junctions considering frontier molecular orbitals and the asymmetric coupling effect

G Wang, Y Kim, SI Na, YH Kahng, J Ku, S Park, YH Jang, DY Kim, T Lee

The Journal of Physical Chemistry C 115 (36), 17979-17985


Indium-free, acid-resistant anatase Nb-doped TiO2 electrodes activated by rapid-thermal annealing for cost-effective organic photovoltaics

JH Park, SJ Kang, SI Na, HH Lee, SW Kim, H Hosono, HK Kim

Solar energy materials and solar cells 95 (8), 2178-2185


Variations of cell performance in ITO-free organic solar cells with increasing cell areas

JS Yeo, JM Yun, SS Kim, DY Kim, J Kim, SI Na

Semiconductor Science and Technology 26 (3), 034010


Effects of deposition temperature on characteristics of Ga-doped ZnO film prepared by highly efficient cylindrical rotating magnetron sputtering for organic solar cells

JH Park, KJ Ahn, SI Na, HK Kim

Solar Energy Materials and Solar Cells 95 (2), 657-663


Enhanced performance of inverted polymer solar cells with cathode interfacial tuning via water-soluble polyfluorenes

SI Na, TS Kim, SH Oh, J Kim, SS Kim, DY Kim

Applied Physics Letters 97 (22), 259


Tuning of a graphene-electrode work function to enhance the efficiency of organic bulk heterojunction photovoltaic cells with an inverted structure

G Jo, SI Na, SH Oh, S Lee, TS Kim, G Wang, M Choe, W Park, J Yoon, ...

Applied Physics Letters 97 (21), 253


The effects of rapid thermal annealing on the electrical, optical, and structural properties of  multilayer electrodes with an inserted nanoscale Ag layer for …

JH Park, YY Choi, HK Kim, HH Lee, SI Na

Journal of Applied Physics 108 (8), 083509


Ink-jet printed transparent electrode using nano-size indium tin oxide particles for organic photovoltaics

JA Jeong, J Lee, H Kim, HK Kim, SI Na

Solar Energy Materials and Solar Cells 94 (10), 1840-1844


High efficiency polymer solar cells via sequential inkjet-printing of PEDOT: PSS and P3HT: PCBM inks with additives

SH Eom, H Park, SH Mujawar, SC Yoon, SS Kim, SI Na, SJ Kang, D Khim, ...

Organic Electronics 11 (9), 1516-1522


Fully spray-coated ITO-free organic solar cells for low-cost power generation

SI Na, BK Yu, SS Kim, D Vak, TS Kim, JS Yeo, DY Kim

Solar Energy Materials and Solar Cells 94 (8), 1333-1337


Water‐soluble polyfluorenes as an interfacial layer leading to cathode‐independent high performance of organic solar cells

SH Oh, SI Na, J Jo, B Lim, D Vak, DY Kim

Advanced Functional Materials 20 (12), 1977-1983


Factors to be considered in bulk heterojunction polymer solar cells fabricated by the spray process

BK Yu, D Vak, J Jo, SI Na, SS Kim, MK Kim, DY Kim

IEEE Journal of Selected Topics in Quantum Electronics 16 (6), 1838-1846


An Al-doped ZnO electrode grown by highly efficient cylindrical rotating magnetron sputtering for low cost organic photovoltaics

JH Park, KJ Ahn, KI Park, SI Na, HK Kim

Journal of Physics D: Applied Physics 43 (11), 115101


Annealing-free fabrication of P3HT: PCBM solar cells via simple brush painting

SS Kim, SI Na, SJ Kang, DY Kim

Solar Energy Materials and Solar Cells 94 (2), 171-175


고분자 PEDOT: PSS 기반 투명전극 소재 기술

SI Na, JS Yeo, JM Yun, JG Kim, DY Kim

Information Display 11 (5), 57-63


A morphology controller for high-efficiency bulk-heterojunction polymer solar cells

B Lim, J Jo, SI Na, J Kim, SS Kim, DY Kim

Journal of Materials Chemistry 20 (48), 10919-10923

Representative Research achievement:  Advanced Materials 23 (42), 4923-4928

The preparation of a reduced graphene oxide (pr-Go) is with a novel p-TosNHNH2 reductant is demonstrated for use as an efficient anode interfacial layer for high-performance and highstability organic solar cells (OSCs). The efficiency of the cells with pr-GO is highly comparable to those of the PEDOT:PSSbased devices. Furthermore, the pr-GO based OSCs show a much longer cell life time in air stability tests in comparison with PEDOT:PSS-based cells.

Before 2010 @ GIST


Electrical conduction through self-assembled monolayers in molecular junctions: Au/molecules/Au versus Au/molecule/PEDOT: PSS/Au

G Wang, H Yoo, SI Na, TW Kim, B Cho, DY Kim, T Lee

Thin Solid Films 518 (2), 824-828


Characteristics of indium-free GZO/Ag/GZO and AZO/Ag/AZO multilayer electrode grown by dual target DC sputtering at room temperature for low-cost organic photovoltaics

HK Park, JW Kang, SI Na, DY Kim, HK Kim

Solar Energy Materials and Solar Cells 93 (11), 1994-2002


Three‐Dimensional Bulk Heterojunction Morphology for Achieving High Internal Quantum Efficiency in Polymer Solar Cells

J Jo, SI Na, SS Kim, TW Lee, Y Chung, SJ Kang, D Vak, DY Kim

Advanced Functional Materials 19 (15), 2398-2406


Characteristics of flexible indium tin oxide electrode grown by continuous roll-to-roll sputtering process for flexible organic solar cells

KH Choi, JA Jeong, JW Kang, DG Kim, JK Kim, SI Na, DY Kim, SS Kim, ...

Solar Energy Materials and Solar Cells 93 (8), 1248-1255


Low resistance and high transparent amorphous IZTO electrode cosputtered by linear facing target sputtering for organic photovoltaics

JA Jeong, HK Kim, SI Na

Electrochemical and Solid-State Letters 12 (9), J80


Room-temperature Indium-free Ga: ZnO/Ag/Ga: ZnO multilayer electrode for organic solar cell applications

HK Park, JA Jeong, YS Park, SI Na, DY Kim, HK Kim

Electrochemical and Solid-State Letters 12 (8), H309


Comparative investigation of transparent ITO/Ag/ITO and ITO/Cu/ITO electrodes grown by dual-target DC sputtering for organic photovoltaics

YS Park, HK Park, JA Jeong, HK Kim, KH Choi, SI Na, DY Kim

Journal of the Electrochemical Society 156 (7), H588


Efficient organic solar cells with polyfluorene derivatives as a cathode interfacial layer

SI Na, SH Oh, SS Kim, DY Kim

Organic Electronics 10 (3), 496-500


Time‐dependent morphology evolution by annealing processes on polymer: fullerene blend solar cells

J Jo, SS Kim, SI Na, BK Yu, DY Kim

Advanced Functional Materials 19 (6), 866-874


Evolution of nanomorphology and anisotropic conductivity in solvent-modified PEDOT: PSS films for polymeric anodes of polymer solar cells

SI Na, G Wang, SS Kim, TW Kim, SH Oh, BK Yu, T Lee, DY Kim

Journal of Materials Chemistry 19 (47), 9045-9053


Efficient polymer solar cells with surface relief gratings fabricated by simple soft lithography

SI Na, SS Kim, J Jo, SH Oh, J Kim, DY Kim

Advanced Functional Materials 18 (24), 3956-3963


Efficient and flexible ITO‐free organic solar cells using highly conductive polymer anodes

SI Na, SS Kim, J Jo, DY Kim

Advanced Materials 20 (21), 4061-4067


Plasmon enhanced performance of organic solar cells using electrodeposited Ag nanoparticles

SS Kim, SI Na, J Jo, DY Kim, YC Nah

Applied Physics Letters 93 (7), 305


Improvement of light extraction efficiency in GaN-based light emitting diodes by random pattern of the p-GaN surface using a silica colloidal mask

JW Park, JH Park, HY Koo, SI Na, SJ Park, HY Song, JW Kim, WC Kim, ...

Japanese journal of applied physics 47 (7R), 5327


Water‐Soluble Polyfluorenes as an Electron Injecting Layer in PLEDs for Extremely High Quantum Efficiency

SH Oh, D Vak, SI Na, TW Lee, DY Kim

Advanced Materials 20 (9), 1624-1629


Efficient photovoltaic device fashioned of highly aligned multilayers of electrospun  nanowire array with conjugated polymer

HS Shim, SI Na, SH Nam, HJ Ahn, HJ Kim, DY Kim, WB Kim

Applied Physics Letters 92 (18), 183107


Modified electrode architecture for efficient and air-stable polymer solar cells based on P3HT: PCBM

SI Na, SS Kim, J Jo, KS Lee, SJ Park, DY Kim

Journal of Photochemistry and Photobiology A: Chemistry 194 (2-3), 161-166


Fabrication of TiO2 nanotubes by using electrodeposited ZnO nanorod template and their application to hybrid solar cells

SI Na, SS Kim, WK Hong, JW Park, J Jo, YC Nah, T Lee, DY Kim

Electrochimica Acta 53 (5), 2560-2566


Efficient polymer solar cells fabricated by simple brush painting

SS Kim, SI Na, J Jo, G Tae, DY Kim

Advanced Materials 19 (24), 4410-4415


Novel cationic water-soluble polyfluorene derivatives with ion-transporting side groups for efficient electron injection in PLEDs

SH Oh, SI Na, YC Nah, D Vak, SS Kim, DY Kim

Organic Electronics 8 (6), 773-783

842007


Surface relief gratings on poly (3-hexylthiophene) and fullerene blends for efficient organic solar cells

SI Na, SS Kim, SS Kwon, J Jo, J Kim, T Lee, DY Kim

Applied Physics Letters 91 (17), 173509


Fabrication of organic bulk heterojunction solar cells by a spray deposition method for low-cost power generation

D Vak, SS Kim, J Jo, SH Oh, SI Na, J Kim, DY Kim

Applied Physics Letters 91 (8), 081102


Improvement of light extraction efficiency of flip-chip light-emitting diode by texturing the bottom side surface of sapphire substrate

DS Han, JY Kim, SI Na, SH Kim, KD Lee, B Kim, SJ Park

IEEE Photonics Technology Letters 18 (13), 1406-1408


Selective wet etching of p-GaN for efficient GaN-based light-emitting diodes

SI Na, GY Ha, DS Han, SS Kim, JY Kim, JH Lim, DJ Kim, KI Min, SJ Park

IEEE photonics technology letters 18 (14), 1512-1514


Enhanced carrier confinement in AlInGaN-InGaN quantum wells in near ultraviolet light-emitting diodes

SH Baek, JO Kim, MK Kwon, IK Park, SI Na, JY Kim, B Kim, SJ Park

IEEE photonics technology letters 18 (11), 1276-1278


Thermally stable and highly reflective AgAl alloy for enhancing light extraction efficiency in GaN light-emitting diodes

JY Kim, SI Na, GY Ha, MK Kwon, IK Park, JH Lim, SJ Park, MH Kim, ...

Applied physics letters 88 (4), 043507


Highly transparent ZnO spreading layer for GaN based LED

JH Lim, DK Hwang, MK Kwon, IK Park, S Na, SJ Park

physica status solidi (c) 2 (7), 2533-2535


Surface roughness induced phase‐separation in InGaN and LED applications

IK Park, YS Kim, MK Kwon, SH Baek, JY Kim, SI Na, SJ Park

physica status solidi (c) 2 (7), 2887-2890


Surface texturing of p‐GaN layer for efficient GaN LED by maskless selective etching

SI Na, DS Han, SS Kim, JH Lim, JY Kim, SJ Park

physica status solidi (c) 2 (7), 2916-2919


Low resistance and high reflectance Pt/Rh contacts to p-type GaN for GaN-based flip chip light-emitting diodes

JR Lee, SI Na, JH Jeong, SN Lee, JS Jang, SH Lee, JJ Jung, JO Song, ...

Journal of the Electrochemical Society 152 (1), G92

Representative Research achievement:  Advanced Materials 20 (21), 4061

ITO-free organic solar cells are fabricated on glass and on flexible substrates. The efficiencies of these cells on glass and plastic substrates (3.27% and 2.8%, respectively) were comparable to those of ITO-based devices (3.66% and 2.9%, respectively). Furthermore, in the flexibility test the ITO-free cells on flexible substrates manifested superior mechanical robustness compared with ITO-based cells.

- Patents -

-안티솔벤트를 이용한 고성능 페로브스카이트 태양전지 및 이의 제조방법 (High-performance perovskite solar cell using anti-solvent and Method for anufacturing the smae): 출원

-정공 수송층을 이용한 고성능 페로브스카이트 태양전지 및 이의 제조방법(High-performance perovskite solar cells using as a hole transport layer and Method for manufacturing the same): 출원

-기능화된 그래핀의 제조방법과 이에 따라 제조된 기능화된 그래핀(preparation of functionalized graphene and functionalized graphene by the same): 등록

-페로브스카이트 전구체 용액, 이를 이용한 페로브스카이트 태양전지, 및 이의 제조방법(Perovskite precursors solution, Perovskite solar cell using the same, and Method for manufacturing the Perovskite solar cell) : 출원

-기능성 첨가제를 이용한 고성능 페로브스카이트 태양전지 및 이의 제조방법(High-performance perovskite solar cells using functional additive and manufacturing method thereof): 출원

-무기물 정공수송층 제조방법 및 이를 포함하는 페로브스카이트 태양전지(A method for manufacturing a inorganic hole transport layer and a perovskite solar cell containing the same): 등록

-유-무기 하이브리드 태양 전지(INORGANIC-ORGANIC HYBRID SOLAR CELL): 등록

-그래핀의 변성방법, 그로부터 얻어지는 변성된 그래핀 및 그를 이용한 유기태양전지(METHOD OF MODIFYING GRAPHENE, MODIFIED GRAPHENE THEREBY AND SOLAR-CELL USING THE SAME): 등록

-3D 프린팅용 잉크 조성물, 이의 제조방법 및 이를 이용한 3D 프린팅 스트레처블 전극 센서(Ink for 3D Printing, manufacturing method, 3D Printing Stretchable conductive sensor thereof): 등록

-공중합체 및 이를 포함하는 유기 태양 전지(COPOLYMER AND ORGANIC SOLAR CELL COMPRISING THE SAME): 등록