Harmonizing the bilateral bond strength of the interfacial molecule in perovskite solar cells

Qiuyang Li, Hong Liu, Cheng-Hung Hou, Haoming Yan, Shunde Li, Peng Chen, Hongyu Xu, Wen-Yi Yu, Yiping Zhao, Yanping Sui, Qixuan Zhong, Yongqiang Ji, Jing-Jong Shyue, Shuang Jia, Bo Yang, Pengyi Tang, Qihuang Gong, Lichen Zhao () and Rui Zhu ()
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Qiuyang Li: Peking University
Hong Liu: Chinese Academy of Sciences
Cheng-Hung Hou: Academia Sinica
Haoming Yan: Peking University
Shunde Li: Peking University
Peng Chen: Peking University
Hongyu Xu: Peking University
Wen-Yi Yu: Academia Sinica
Yiping Zhao: Chinese Academy of Sciences
Yanping Sui: Chinese Academy of Sciences
Qixuan Zhong: Peking University
Yongqiang Ji: Peking University
Jing-Jong Shyue: Academia Sinica
Shuang Jia: Peking University
Bo Yang: ShanghaiTech University
Pengyi Tang: Chinese Academy of Sciences
Qihuang Gong: Peking University
Lichen Zhao: Peking University
Rui Zhu: Peking University

Nature Energy, 2024, vol. 9, issue 12, 1506-1516

Abstract: Abstract Interfacial molecules have been demonstrated to improve the photovoltaic performance of perovskite solar cells (PSCs). However, the effect is influenced by the targeted substrate and, in particular, by its bond with the interfacial molecule. A weaker bonding of the interfacial molecule with the substrate usually implies a stronger bonding with the perovskite that could lead to uncontrollable insertion of the interfacial molecule into the perovskite bulk, resulting in device degradation. Here we select bis(2-aminoethyl) ether (BAE) as the interfacial molecule between the perovskite and the electron transport layer (ETL) in n–i–p PSCs and develop a strategy to harmonize the strength of the bilateral bonds of BAE. In particular, we manipulate the electronic structure of the ETL with doping to increase the strength of the BAE–ETL bond. This thereby results in a weakening of the BAE–perovskite bond. The harmonization in bilateral bonds of the interfacial molecule leads to PSCs with an efficiency surpassing 26.5% (certified as 26.31%) and improved stability.

Date: 2024
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DOI: 10.1038/s41560-024-01642-3

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