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Cho H, Song J, Shin JW, Moon J, Kwon BH, Lee JI, Yoo S, Cho NS. Identification of a multi-stack structure of graphene electrodes doped layer-by-layer with benzimidazole and its implication for the design of optoelectronic devices. OPTICS EXPRESS 2021; 29:23131-23141. [PMID: 34614583 DOI: 10.1364/oe.430149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 06/27/2021] [Indexed: 06/13/2023]
Abstract
Optical properties of benzimidazole (BI)-doped layer-by-layer graphene differ significantly from those of intrinsic graphene. Our study based on transmission electron microscopy and X-ray photoelectron spectroscopy depth profiling reveals that such a difference stems from its peculiar stratified geometry formed in situ during the doping process. This work presents an effective thickness and optical constants that can treat these multi-stacked BI-doped graphene electrodes as a single equivalent medium. For verification, the efficiency and angular emission spectra of organic light-emitting diodes with the BI-doped graphene electrode are modeled with the proposed method, and we demonstrate that the calculation matches experimental results in a much narrower margin than that based on the optical properties of undoped graphene.
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Wang M, Yu H, Ma X, Yao Y, Wang L, Liu L, Cao K, Liu S, Dong C, Zhao B, Song C, Chen S, Huang W. Copper oxide-modified graphene anode and its application in organic photovoltaic cells. OPTICS EXPRESS 2018; 26:A769-A776. [PMID: 30184836 DOI: 10.1364/oe.26.00a769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 06/24/2018] [Indexed: 06/08/2023]
Abstract
Graphene is an ideal substitute for indium tin oxide electrode in organic photovoltaic (OPV) devices, due to its outstanding electrical, optical, chemical and mechanical properties. However, the graphene electrode suffers from work function mismatch with common hole injection layer and intrinsic hydrophobic property. Here, CuxO is proposed to modify monolayer graphene in order to increase the work function of graphene (from 4.45 to 4.76 eV) and decrease the water contact angle (from 88° to 59°). Then, the OPV devices based on the CuxO modified graphene anode are fabricated successfully, and power conversion efficiency (PCE) is enhanced from 4.00 ± 0.44 to 5.23 ± 0.47%. Furthermore, the ternary blended polymer solar cell is fabricated by adding a small molecular material 1, 2, 5-thiadiazole-fused 12-ring polyaromatic hydrocarbon into the active layer, and the PCE is improved to 6.03 ± 0.53%, due to the enhanced absorption and depressed recombination inside the active layer.
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Zhang Y, Wu G, Ding C, Liu F, Yao Y, Zhou Y, Wu C, Nakazawa N, Huang Q, Toyoda T, Wang R, Hayase S, Zou Z, Shen Q. Lead Selenide Colloidal Quantum Dot Solar Cells Achieving High Open-Circuit Voltage with One-Step Deposition Strategy. J Phys Chem Lett 2018; 9:3598-3603. [PMID: 29905077 DOI: 10.1021/acs.jpclett.8b01514] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Lead selenide (PbSe) colloidal quantum dots (CQDs) are considered to be a strong candidate for high-efficiency colloidal quantum dot solar cells (CQDSCs) due to its efficient multiple exciton generation. However, currently, even the best PbSe CQDSCs can only display open-circuit voltage ( Voc) about 0.530 V. Here, we introduce a solution-phase ligand exchange method to prepare PbI2-capped PbSe (PbSe-PbI2) CQD inks, and for the first time, the absorber layer of PbSe CQDSCs was deposited in one step by using this PbSe-PbI2 CQD inks. One-step-deposited PbSe CQDs absorber layer exhibits fast charge transfer rate, reduced energy funneling, and low trap assisted recombination. The champion large-area (active area is 0.35 cm2) PbSe CQDSCs fabricated with one-step PbSe CQDs achieve a power conversion efficiency (PCE) of 6.0% and a Voc of 0.616 V, which is the highest Voc among PbSe CQDSCs reported to date.
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Affiliation(s)
- Yaohong Zhang
- Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan
| | - Guohua Wu
- School of Materials Science and Engineering , Shaanxi Normal University , Xi'an 710119 , China
| | - Chao Ding
- Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan
| | - Feng Liu
- Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan
| | - Yingfang Yao
- Ecomaterials and Renewable Energy Research Center, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures , Nanjing University , Nanjing 210093 , China
| | - Yong Zhou
- Ecomaterials and Renewable Energy Research Center, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures , Nanjing University , Nanjing 210093 , China
| | - Congping Wu
- Kunshan Sunlaite New Energy Technology Co. Ltd ., Suzhou 215347 , China
| | - Naoki Nakazawa
- Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan
| | - Qingxun Huang
- Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan
| | - Taro Toyoda
- Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan
| | - Ruixiang Wang
- Beijing Engineering Research Centre of Sustainable Energy and Buildings , Beijing University of Civil Engineering and Architecture , Beijing 102616 , China
| | - Shuzi Hayase
- Faculty of Life Science and Systems Engineering , Kyushu Institute of Technology , Fukuoka 808-0196 , Japan
| | - Zhigang Zou
- Ecomaterials and Renewable Energy Research Center, Jiangsu Key Laboratory for Nano Technology, National Laboratory of Solid State Microstructures , Nanjing University , Nanjing 210093 , China
- Kunshan Sunlaite New Energy Technology Co. Ltd ., Suzhou 215347 , China
| | - Qing Shen
- Faculty of Informatics and Engineering , The University of Electro-Communications , Tokyo 182-8585 , Japan
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Wu H, Zhang Y, Zhang X, Lu M, Sun C, Bai X, Zhang T, Sun G, Yu WW. Fine-Tuned Multilayered Transparent Electrode for Highly Transparent Perovskite Light-Emitting Devices. ADVANCED ELECTRONIC MATERIALS 2018; 4:1700285. [PMID: 31223558 PMCID: PMC6586238 DOI: 10.1002/aelm.201700285] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The high photoluminescence quantum yield, wide color tunability and narrow bandwidth of perovskite nanocrystals make them favorable for light source and display applications. Here, highly transparent green-light-emitting devices (LEDs) using inorganic cesium lead halide perovskite nanocrystal films as the emissive layer are reported. The effect of multilayered nanostructured transparent electrode on optical properties and performance within the LEDs is investigated by fine tuning layer thickness. The results show that the light transmission in visible region can be enhanced with this nanostructured film. These LEDs exhibited a high transmittance (average 73% over 400-700 nm) and high brightness of 2640 and 1572 cd m-2 for indium-doped tin oxide (ITO) cathode and MoO x /Au/MoO x anode sides, respectively.
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Affiliation(s)
- Hua Wu
- State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Yu Zhang
- State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China,
| | - Xiaoyu Zhang
- State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Min Lu
- State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Chun Sun
- State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Xue Bai
- State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China
| | - Tieqiang Zhang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Guang Sun
- China-Japan Union Hospital, Jilin University, Changchun 130012, China,
| | - William W Yu
- State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China, Department of Chemistry and Physics, Louisiana State University, Shreveport, LA 71115, USA,
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