Band engineering at the interface of all-inorganic CsPbI2Br solar cells

Abstract

An all-inorganic CsPbI₂Br perovskite with excellent phase stability and thermal stability has been considered to be a promising candidate for photovoltaic application. However, low efficiency and high moisture sensitivity hinder its advancement. In this work, we exploit 4-bromobenzylamine hydriodate post-treatment on CsPbI₂Br thin films to assist the extraction of holes and to block the flow of electrons to the hole transport layer through band engineering at the CsPbI₂Br bulk/surface. We found through depth profile analysis that a small amount of BrBeAI permeates into the CsPbI₂Br bulk and mainly locates at the CsPbI₂Br grain boundaries. This treatment leads to an improved short-circuit current of CsPbI₂Br solar cells and an enhanced efficiency from 13.10% to 14.63%. In addition, the incorporation of the hydrophobic organic component into perovskite films effectively enhances the moisture resistance. This result proves that utilizing organic ammonium salt to improve the performance of the device through band alignment is an effective strategy for all-inorganic perovskite solar cell optimization.