1 State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an 710071, China; 2 Advanced Interdisciplinary Research Center for Flexible Electronics, Xidian University, Xi'an 710071, China
Abstract Due to excellent thermal stability and optoelectronic properties, all-inorganic perovskite is one of the promising candidates to solve the thermal decomposition problem of conventional organic—inorganic hybrid perovskite solar cells (PSCs), but the larger voltage loss (Vloss) cannot be ignored, especially CsPbIBr2, which limits the improvement of efficiency. To reduce Vloss, one promising solution is the modification of the energy level alignment between the perovskite layer and adjacent charge transport layer (CTL), which can facilitate charge extraction and reduce carrier recombination rate at the perovskite/CTL interface. Therefore, the key issues of minimum Vloss and high efficiency of CsPbIBr2-based PSCs were studied in terms of the perovskite layer thickness, the effects of band offset of the CTL/perovskite layer, the doping concentration of the CTL, and the electrode work function in this study based on device simulations. The open-circuit voltage (Voc) is increased from 1.37 V to 1.52 V by replacing SnO2 with ZnO as the electron transport layer (ETL) due to more matching conduction band with the CsPbIBr2 layer.
Fund: This work was financially supported by the National Natural Science Foundation of China (Grant No. 52192610), the Key Research and Development Program of Shaanxi Province, China (Grant No. 2020GY-310), Youth Project of Natural Science Basic Research Program of Shaanxi Province, China (Grant No. 2021JQ-189), the Joint Research Funds of Department of Science & Technology of Shaanxi Province and Northwestern Polytechnical University (Grant No. 2020GXLH-Z-018), and the Fundamental Research Funds for the Central Universities, China.
Ying Hu(胡颖), Jiaping Wang(王家平), Peng Zhao(赵鹏), Zhenhua Lin(林珍华), Siyu Zhang(张思玉), Jie Su(苏杰), Miao Zhang(张苗), Jincheng Zhang(张进成), Jingjing Chang(常晶晶), and Yue Hao(郝跃) Reveal the large open-circuit voltage deficit of all-inorganicCsPbIBr2 perovskite solar cells 2022 Chin. Phys. B 31 038804
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