Performance analysis of cesium formamidinium lead mixed halide based perovskite solar cell with MoOx as hole transport material via SCAPS-1D

Cesium formamidinium lead mixed halide (FA(0.83)Cs(0.17)PbI(1.5)Br(1.5)) perovskite solar cells (PSCs) have gained enormous attention being a top cell of perovskite-perovskite tandem cells and solar cells with triple-junction due to wide bandgap, prolonged diffusion length, and tremendous charge carrier mobility. But the performances of FA(0.83)Cs(0.17)PbI(1.5)Br(1.5) based PSC are limited by the large valance band offset of conventional hole transport material (HTM). Molybdenum oxide (MoOx) can be an appropriate HTM in this regard as it exhibits a low valance band offset with FA(0.83)Cs(0.17)PbI(1.5)Br(1.5) perovskite. In our work, we have simulated an n-i-p structured FA(0.83)Cs(0.17)PbI(1.5)Br(1.5) based PSC using MoOx as HTM via SCAPS-1D. Investigating the impacts of perovskite layer thickness, defect density, hole transport layer thickness, back-contact work function, and interface defects, we find an encouraging efficiency of similar to 20.1 %. The analysis reveals that FA(0.83)Cs(0.17)PbI(1.5)Br(1.5) based solar cell using MoOx as HTM is compatible to be a benign top cell and may contribute to design a highly efficient perovskite-perovskite tandem or triple junction configuration.

Automated summary

Cesium formamidinium lead mixed halide perovskite solar cells show potential for high efficiency, with molybdenum oxide as a favorable hole transport material. This combination may contribute to the design of efficient perovskite-perovskite tandem or triple junction configurations for solar cells.