19.5% Inverted organic photovoltaic with record long-lifetime via multifunctional interface engineering featuring radical scavenger

Jiaming Huang, Jiehao Fu, Bo Yuan, Hao Xia, Tianxiang Chen, Yongwen Lang, Heng Liu, Zhiwei Ren, Qiong Liang, Kuan Liu, Zhiqiang Guan, Guangruixing Zou, Hrisheekesh Thachoth Chandran, Tsz Woon Benedict Lo, Xinhui Lu, Chun-Sing Lee, Hin-Lap Yip, Yung-Kang Peng and Gang Li ()
Additional contact information
Jiaming Huang: The Hong Kong Polytechnic University
Jiehao Fu: The Hong Kong Polytechnic University
Bo Yuan: City University of Hong Kong
Hao Xia: The Hong Kong Polytechnic University
Tianxiang Chen: The Hong Kong Polytechnic University
Yongwen Lang: The Hong Kong Polytechnic University
Heng Liu: The Chinese University of Hong Kong
Zhiwei Ren: The Hong Kong Polytechnic University
Qiong Liang: The Hong Kong Polytechnic University
Kuan Liu: The Hong Kong Polytechnic University
Zhiqiang Guan: City University of Hong Kong
Guangruixing Zou: City University of Hong Kong
Hrisheekesh Thachoth Chandran: The Hong Kong Polytechnic University
Tsz Woon Benedict Lo: The Hong Kong Polytechnic University
Xinhui Lu: The Chinese University of Hong Kong
Chun-Sing Lee: City University of Hong Kong
Hin-Lap Yip: City University of Hong Kong
Yung-Kang Peng: City University of Hong Kong
Gang Li: The Hong Kong Polytechnic University

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Advances in improving the operational lifetime of highly efficient organic photovoltaic (OPV) and understanding photo-degradation mechanisms in molecular level are currently limited, especially on the promising inverted OPV, posing critical challenges to commercialization. Here, we demonstrate a radical scavenger (3-(3,5-Di-tert-butyl-4-hydroxyphenyl)propionic acid) capped ZnO (BHT@ZnO) nanoparticles as the electron transport layer providing effective surface oxygen vacancy passivation and reactive radical capture capability. Encouragingly, this BHT@ZnO-based empowered device achieves a record inverted OPV efficiency of 19.47% (Certificated efficiency: 18.97%). The devices demonstrate light soaking-free behavior, long-term stability under ISOS-D-1 (94.2% PCE retention after 8904 h in ambient) and ISOS-L-1 testing protocol (81.5% PCE retention after 7724 h in MPP). More importantly, we elucidate detailed degradation mechanism in OPV involving selectively catalytic degradation of donor and acceptor by superoxide and hydroxyl radicals, respectively, as well as the degradation pathway of polymer donor upon radiation exposure. Performance enhancement and mechanism comprehension provide strong support for the development of OPV technology.

Date: 2024
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DOI: 10.1038/s41467-024-54923-6

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