Highly-Stable CsPbI3 Perovskite Solar Cells with an Efficiency of 21.11% via Fluorinated 4-Amino-Benzoate Cesium Bifacial Passivation |
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Authors: | Dongfang Xu Jungang Wang Yuwei Duan Shaomin Yang Hong Zou Lu Yang Na Zhang Hui Zhou Xuruo Lei Meizi Wu Shengzhong Liu Zhike Liu |
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Affiliation: | Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119 China |
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Abstract: | The poor interface quality between cesium lead triiodide (CsPbI3) perovskite and the electron transport layer limits the stability and efficiency of CsPbI3 perovskite solar cells (PSCs). Herein, a 4-amino-2,3,5,6-tetrafluorobenzoate cesium (ATFC) is designed as a bifacial defect passivator to tailor the perovskite/TiO2 interface. The comprehensive experiments demonstrate that ATFC can not only optimize the conductivity, electron mobility, and energy band structure of the TiO2 layer by passivation of the undercoordinated Ti4+, oxygen vacancy (VO), and free ? OH defects but also promote the yield of high-quality CsPbI3 film by synergistic passivation of undercoordinated Pb2+ defects with the ? C?O group and F atom, and limiting I? migration via F···I interaction. Benefiting from the above interactions, the ATFC-modified CsPbI3 device yields a champion power conversion efficiency (PCE) of 21.11% and an excellent open-circuit voltage (VOC) of 1.24 V. Meanwhile, the optimized CsPbI3 PSC maintains 92.74% of its initial efficiency after aging 800 h in air atmosphere, and has almost no efficiency attenuation after tracking at maximum power point for 350 h. |
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Keywords: | 4-amino-2 3 5 6-tetrafluorobenzoate cesium bifacial modifications CsPbI3 high efficiency perovskite solar cells |
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