Monolithically-grained perovskite solar cell with Mortise-Tenon structure for charge extraction balance
Fangfang Wang, Mubai Li, Qiushuang Tian, Riming Sun, Hongzhuang Ma, Hongze Wang, Jingxi Chang, Zihao Li, Haoyu Chen, Jiupeng Cao, Aifei Wang, Jingjin Dong, You Liu, Jinzheng Zhao, Ying Chu, Suhao Yan, Zichao Wu, Jiaxin Liu, Ya Li, Xianglin Chen, Ping Gao, Yue Sun, Tingting Liu, Wenbo Liu, Renzhi Li, Jianpu Wang, Yi‐Bing Cheng, Xiaogang Liu, Wei Huang, Tianshi Qin
Abstract
Although the power conversion efficiency values of perovskite solar cells continue to be refreshed, it is still far from the theoretical Shockley-Queisser limit. Two major issues need to be addressed, including disorder crystallization of perovskite and unbalanced interface charge extraction, which limit further improvements in device efficiency. Herein, we develop a thermally polymerized additive as the polymer template in the perovskite film, which can form monolithic perovskite grain and a unique "Mortise-Tenon" structure after spin-coating hole-transport layer. Importantly, the suppressed non-radiative recombination and balanced interface charge extraction benefit from high-quality perovskite crystals and Mortise-Tenon structure, resulting in enhanced open-circuit voltage and fill-factor of the device. The PSCs achieve certified efficiency of 24.55% and maintain >95% initial efficiency over 1100 h in accordance with the ISOS-L-2 protocol, as well as excellent endurance according to the ISOS-D-3 accelerated aging test.