Optimizing the working mechanism of the CsPbBr3-based inorganic perovskite solar cells for enhanced efficiency

材料科学 钙钛矿(结构) 能量转换效率 光电子学 异质结 带隙 钙钛矿太阳能电池 载流子 电流密度 开路电压 化学工程 电压 电气工程 物理 量子力学 工程类
作者
Saad Ullah,Ping Liu,Jiaming Wang,Peixin Yang,Linlin Liu,Shi-e Yang,Haizhong Guo,Tianyu Xia,Yongsheng Chen
出处
期刊:Solar Energy [Elsevier BV]
卷期号:209: 79-84 被引量:54
标识
DOI:10.1016/j.solener.2020.09.003
摘要

Recently, inorganic perovskite solar cells (PSCs) based on CsPbBr3 have triggered incredible interest due to the demonstrated excellent stability against thermal and high humidity environmental conditions. However, the power conversion efficiency (PCE) of the CsPbBr3-based PSCs is still lower than that of the organic-inorganic hybrid one, because of the large band gap and serious charge recombination at the interface or inside the device. Here, the working mechanism of the devices with normal n-i-p planar structure is modeled and investigated using SCAPS 1D simulation software. The simulation results state that the proper band structure of PSCs is crucial to carrier separation and transport. The high interface recombination, originated from the large band offsets of the electron transport material (ETM)/absorber and absorber/hole transport material (HTM) respectively, can be effectively diminished with the continuous gradient junction design of the absorber, and a PCE of 11.58% is obtained with a high open-circuit voltage (VOC) of 1.68 V. Moreover, by building a heterojunction bilayer absorption scenario of CsPbIBr2/CsPbBr3 and employing ZnOS and Cu2ZnSnS4 films as the ETM and HTM respectively, the PCE of PSCs is further increased to 15.89%, caused mainly by the enhancement in short-current density (JSC). Moreover, reducing the interface defect density is also very important to improve the performance of PSCs. These results will provide theoretical guidance for improving the performance of the CsPbBr3-based PSCs.
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