High‐Performance Carbon‐Based CsPbIBr<sub>2</sub> Solar Cells by SnO<sub>2</sub>–MXene‐Regulating Perovskite Vertical Growth
Deng Wang, Wenjing Li, Guangtian Yu, Qianju Zheng, Minglang Huang, Zhenghe Zhang, Xuping Liu, Xiao Jin, Zhang Lan, Jihuai Wu, Qinghua Li
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 SnO 2 –MXene nanocomposites are used as the electron transport layer. The introduction of MXene not only inhibits SnO 2 agglomeration and induces the vertical growth of CsPbIBr 2 , but also passivates defects of the SnO 2 /CsPbIBr 2 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.