High‐Performance Carbon‐Based CsPbIBr2 Solar Cells by SnO2–MXene‐Regulating Perovskite Vertical Growth

Abstract

Due to its unique photoelectric properties, MXene has a wide range of potential applications. Herein, different MXene contents (0, 0.10, 0.15, 0.20, 0.25, 0.4 wt%) of SnO2–MXene nanocomposites are used as the electron transport layer. The introduction of MXene not only inhibits SnO2 agglomeration and induces the vertical growth of CsPbIBr2, but also passivates defects of the SnO2/CsPbIBr2 interface. It effectively increases the power conversion efficiency from 8.98% to 11.21%. In addition, even after 1000 h of storage with a relative humidity of more than 50% in the ambient air, the unsealed device still maintains about 92% of its initial efficiency. This strategy provides a promising way to improve the efficiency of solar cells.