摘要
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(V_(loss)) cannot be ignored, especially CsPbIBr_(2), which limits the improvement of efficiency. To reduce V_(loss), 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 V_(loss) and high efficiency of CsPbIBr_(2)-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(V_(oc)) is increased from 1.37 V to 1.52 V by replacing SnO_(2) with ZnO as the electron transport layer(ETL) due to more matching conduction band with the CsPbIBr;layer.
作者
胡颖
王家平
赵鹏
林珍华
张思玉
苏杰
张苗
张进成
常晶晶
郝跃
Ying Hu;Jiaping Wang;Peng Zhao;Zhenhua Lin;Siyu Zhang;Jie Su;Miao Zhang;Jincheng Zhang;Jingjing Chang;Yue Hao(State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology,School of Microelectronics,Xidian University,Xi'an 710071,China;Advanced Interdisciplinary Research Center for Flexible Electronics,Xidian University,Xi'an 710071,China)
基金
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)
the Fundamental Research Funds for the Central Universities, China。