Minimizing buried interfacial defects for efficient inverted perovskite solar cells
Shuo Zhang, Fangyuan Ye, Xiaoyu Wang, Rui Chen, Huidong Zhang, Liqing Zhan, Xianyuan Jiang, Yawen Li, Xiaoyu Ji, Shuaijun Liu, Miaojie Yu, Furong Yu, Yilin Zhang, Ruihan Wu, Zonghao Liu, Zhijun Ning, Dieter Neher, Liyuan Han, Yuze Lin, He Tian, Wei Chen, Martin Stolterfoht, Lijun Zhang, Weihong Zhu, Yongzhen Wu
Abstract
Controlling the perovskite morphology and defects at the buried perovskite-substrate interface is challenging for inverted perovskite solar cells. In this work, we report an amphiphilic molecular hole transporter, (2-(4-(bis(4-methoxyphenyl)amino)phenyl)-1-cyanovinyl)phosphonic acid, that features a multifunctional cyanovinyl phosphonic acid group and forms a superwetting underlayer for perovskite deposition, which enables high-quality perovskite films with minimized defects at the buried interface. The resulting perovskite film has a photoluminescence quantum yield of 17% and a Shockley-Read-Hall lifetime of nearly 7 microseconds and achieved a certified power conversion efficiency (PCE) of 25.4% with an open-circuit voltage of 1.21 volts and a fill factor of 84.7%. In addition, 1-square centimeter cells and 10-square centimeter minimodules show PCEs of 23.4 and 22.0%, respectively. Encapsulated modules exhibited high stability under both operational and damp heat test conditions.