Fabrication of Porous Lead Bromide Films by Introducing Indium Tribromide for Efficient Inorganic CsPbBr3 Perovskite Solar Cells

In the process of preparing CsPbBr3films by two-step or multi-step methods, due to the low solubility of CsBr in organic solvents, the prepared perovskite films often have a large number of holes, which is definitely not conducive to the performance of CsPbBr3perovskite solar cells (PSCs). In response to this problem, this article proposed a method of introducing InBr3into the PbBr2precursor to prepare a porous PbBr2film to increase the reaction efficiency between CsBr and PbBr2and achieve the purpose of In (Ⅲ) incorporation, which not only optimized the morphology of the produced CsPbBr3film but also enhanced the charge extraction and transport capabilities, which was ascribed to the reduction of the trap state density and impurity phases in the perovskite films, improving the performance of CsPbBr3PSCs. At the optimal InBr3concentration of 0.21 M, the InBr3:CsPbBr3perovskite solar cell exhibited a power conversion efficiency of 6.48%, which was significantly higher than that of the pristine device.