Fabrication of {CH(NH2)2}1-xCsxPbI3 perovskite thin films by two-step method and its application to thin film solar cells

Abstract

We have investigated the fabrication process of organic-inorganic perovskite {CH(NH2)2}1-xCsxPbI3 thin films on compact TiO2 layers by the reaction of porous PbCsxI2+x layers and CH(NH2)2I solution. The perovskite thin films have compact pore-free surfaces with minimal surface roughness. A planar-structured {CH(NH2)2}1-xCsxPbI3 thin film solar cell with x = 0.2 exhibited a power conversion efficiency of 14.7% in reverse scan.