Design of all-inorganic hole-transport-material-free CsPbI3/CsSnI3 heterojunction solar cells by device simulation. (1st February 2022)

• Record Type: Journal Article
• Authors: Xu, Xingyu; Wang, Jianfeng; Cao, Dan; Zhou, Yun; Jiao, Zhiwei
• Is Part Of: Materials research express. Volume 9:Number 2(2022)
• Publication Date: 2022-02-01
• Subjects: CsPbI3/CsSnI3 heterojunction -- hole transport material free -- perovskite solar cells -- simulation; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ac5778
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: The hole transport material (HTM)-free perovskite solar cells (PSCs) have attracted widespread interest due to enhanced stability and lowered cost as compared to the sandwich-type PSCs with an organic hole conductor. For the absorber layer, CsPbI3 has become a competitive candidate for its good chemical-components stability, excellent optoelectronic properties and most proper bandgap among inorganic halide perovskites. However, the power conversion efficiency of CsPbI3 -based HTM-free PSCs is still much inferior to that of conventional ones. In this work, an all-inorganic-perovskite-heterojunction CsPbI3 /CsSnI3 is proposed as the absorber and the HTM-free CsPbI3 /CsSnI3 PSCs are investigated systematically through numerical simulation by using SCAPS-1D. Compared with the HTM-free PSCs employing a single CsPbI3 absorbing layer, the HTM-free CsPbI3 /CsSnI3 PSCs have the extended absorption range and enhanced performance. The best cell efficiency is increased from 15.60% to 19.99% and from 13.87% to 19.59% for the cell with a back-front Au electrode and a back-front C electrode, respectively. It reveals that for the HTM-free CsPbI3 /CsSnI3 heterojunction cells, C is a good choice for back-front electrode as it can achieve desirable cell performance with improved stability and lowered fabrication cost. These results indicate that the proposed HTM-free CsPbI3 /CsSnI3 heterojunction cells are promising for photovoltaic applications.