1. Monolithically-grained perovskite solar cell with Mortise-Tenon structure for charge extraction balance.
- Author
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Wang, Fangfang, Li, Mubai, Tian, Qiushuang, Sun, Riming, Ma, Hongzhuang, Wang, Hongze, Chang, Jingxi, Li, Zihao, Chen, Haoyu, Cao, Jiupeng, Wang, Aifei, Dong, Jingjin, Liu, You, Zhao, Jinzheng, Chu, Ying, Yan, Suhao, Wu, Zichao, Liu, Jiaxin, Li, Ya, and Chen, Xianglin
- Subjects
SOLAR cells ,PHOTOVOLTAIC power systems ,PEROVSKITE ,ELECTRON transport ,OPEN-circuit voltage ,CRYSTAL structure - 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. Disorder crystallization of perovskite and unbalanced charge extraction limit the performance of perovskite solar cells. Here, the authors develop self-polymerizing additive to form monolithic perovskite grains with mortise-tenon structure, achieving efficiency over 24% and long device stability. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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