Functional‐Group‐Induced Single Quantum Well Dion–Jacobson 2D Perovskite for Efficient and Stable Inverted Perovskite Solar Cells
Cheng Gong, Xihan Chen, Jie Zeng, Huaxin Wang, Jing Li, Qingkai Qian, Cong Zhang, Qixin Zhuang, Xuemeng Yu, Shaokuan Gong, Hua Yang, Baomin Xu, Jiangzhao Chen, Zhigang Zang
Abstract
Abstract In two‐dimensional/three‐dimensional (2D/3D) perovskite heterostructure, randomly distributed multiple quantum wells (QW) 2D perovskites are frequently generated, which are detrimental to carrier transport and structural stability. Here, the high quality 2D/3D perovskite heterostructure is constructed by fabricating functional‐group‐induced single QW Dion–Jacobson (DJ) 2D perovskites. The utilization of ─ OCH 3 in the precursor solution facilitates the formation of colloidal particles with uniform size, resulting in the production of a pure 2D DJ perovskite with an n value of 3. This strategy facilitates the improvement of 3D structural stability and expedites carrier transport. The resultant devices accomplish a power conversion efficiency of 25.26% (certified 25.04%) and 23.56% at a larger area (1 cm 2 ) with negligible hysteresis. The devices maintain >96% and >89% of their initial efficiency after continuous maximum power point tracking under simulated AM1.5 illumination for 1300 h and under damp‐heat conditions (85 °C and 85% RH) for 1010 h, respectively.