Improved performance of inorganic CsPbI3 perovskite solar cells with WO3/C60 UTL bilayer as an ETL structure: a computational study

双层 钙钛矿(结构) 材料科学 结晶学 化学 生物化学
作者
Aminreza Mohandes,Mahmood Moradi
出处
期刊:Physica Scripta [IOP Publishing]
卷期号:99 (5): 055951-055951 被引量:2
标识
DOI:10.1088/1402-4896/ad3a2a
摘要

Abstract CsPbI 3 , also known as cesium lead iodide, has garnered significant attention as a potential absorber in perovskite solar cells (PSCs). CsPbI 3 -PSCs have not matched the high performance of hybrid PSCs. This study aimed to identify an effective combination of charge transport layers. Six-hole transporting layers (HTLs) including Spiro-OMeTAD, Cu 2 O, CuO, CuAlO 2 , CuSbS 2 , and SrCu 2 O 2 , as well as five electron transporting layers (ETLs) such as TiO 2 , WO 3 , ZnO, IGZO, and CdZnS, were tested separately in 30 PSCs. The findings of this research indicate that CuAlO 2 as the HTL and WO 3 as the ETL that are the most appropriate materials among the options examined, so we use FTO/WO 3 /CsPbI 3 /CuAlO 2 /Au as a required PSC. In this research, we used SCAPS (Solar Cell Capacitance Simulator)−1D device modeling to investigate the bilayer ETL of inorganic CsPbI 3 -PSC and discover the methods to improve their efficiency. In planar PSCs, optimizing electron–hole pair extraction and recombination at the ETL/perovskite interface is crucial for achieving high performance. The key concept is to enhance the WO 3 /perovskite interface properties by adding a 5 nm ultra-thin layer (UTL) of C60. The bilayer structure WO 3 /C60 was found to have the advantage of high electron extraction and low interfacial recombination, primarily due to more effective energy level alignment and defect passivation. To achieve the superior efficiency of PSC, various factors such as defect and doping densities in all layers, the energy level alteration of ETL and HTL, interface defect densities on both ETL and HTL sides, back metal contact, operating temperature, and parasitic resistances were optimized. After optimizing these parameters, the efficiency of the system containing WO 3 /C60 bilayer ETL was found to be 29.39%. The current work proposes a straightforward and promising method to create photovoltaic devices, especially for many types of perovskites, with desirable charge transport layers and recombination properties.
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