A Highly Conductive Titanium Oxynitride Electron-Selective Contact for Efficient Photovoltaic Devices |
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| Authors: | Xinbo Yang Yuanbao Lin Jiang Liu Wenzhu Liu Qunyu Bi Xin Song Jingxuan Kang Fuzong Xu Lujia Xu Mohamed N. Hedhili Derya Baran Xiaohong Zhang Thomas D. Anthopoulos Stefaan De Wolf |
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| Affiliation: | 1. College of Energy, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Soochow University, Suzhou, 215006 P. R. China;2. KAUST Solar Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia;3. Research Center for New Energy Technology, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences, Jiading, Shanghai, 201800 P. R. China;4. KAUST Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia;5. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren’ai Road, Suzhou, Jiangsu, 215123 P. R. China |
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| Abstract: | High-quality carrier-selective contacts with suitable electronic properties are a prerequisite for photovoltaic devices with high power conversion efficiency (PCE). In this work, an efficient electron-selective contact, titanium oxynitride (TiOxNy), is developed for crystalline silicon (c-Si) and organic photovoltaic devices. Atomic-layer-deposited TiOxNy is demonstrated to be highly conductive with a proper work function (4.3 eV) and a wide bandgap (3.4 eV). Thin TiOxNy films simultaneously provide a moderate surface passivation and enable a low contact resistivity on c-Si surfaces. By implementation of an optimal TiOxNy-based contact, a state-of-the-art PCE of 22.3% is achieved for a c-Si solar cell featuring a full-area dopant-free electron-selective contact. Simultaneously, conductive TiOxNy is proven to be an efficient electron-transport layer for organic photovoltaic (OPV) devices. A remarkably high PCE of 17.02% is achieved for an OPV device with an electron-transport TiOxNy layer, which is superior to conventional ZnO-based devices with a PCE of 16.10%. Atomic-layer-deposited TiOxNy ETL on a large area with a high uniformity may help accelerate the commercialization of emerging solar technologies. |
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| Keywords: | electron-selective contacts organic solar cells passivating contacts silicon solar cells titanium oxynitride |
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