Molecular insights of exceptionally photostable electron acceptors for organic photovoltaics

Zhi-Xi Liu, Zhi-Peng Yu, Ziqiu Shen, Chengliang He, Tsz-Ki Lau, Zeng Chen, Haiming Zhu, Xinhui Lu, Zengqi Xie, Hongzheng Chen and Chang-Zhi Li ()
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Zhi-Xi Liu: Zhejiang University
Zhi-Peng Yu: Zhejiang University
Ziqiu Shen: Zhejiang University
Chengliang He: Zhejiang University
Tsz-Ki Lau: The Chinese University of Hong Kong, New Territories
Zeng Chen: Zhejiang University
Haiming Zhu: Zhejiang University
Xinhui Lu: The Chinese University of Hong Kong, New Territories
Zengqi Xie: South China University of Technology
Hongzheng Chen: Zhejiang University
Chang-Zhi Li: Zhejiang University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Photo-degradation of organic semiconductors remains as an obstacle preventing their durable practice in optoelectronics. Herein, we disclose that volume-conserving photoisomerization of a unique series of acceptor-donor-acceptor (A-D-A) non-fullerene acceptors (NFAs) acts as a surrogate towards their subsequent photochemical reaction. Among A-D-A NFAs with fused, semi-fused and non-fused backbones, fully non-fused PTIC, representing one of rare existing samples, exhibits not only excellent photochemical tolerance in aerobic condition, but also efficient performance in solar cells. Along with a series of in-depth investigations, we identify that the structural confinement to inhibit photoisomerization of these unique A-D-A NFAs from molecular level to macroscopic condensed solid helps enhancing the photochemical stabilities of molecules, as well as the corresponding OSCs. Although other reasons associating with the photostabilities of molecules and devices should not excluded, we believe this work provides helpful structure-property information toward new design of stable and efficient photovoltaic molecules and solar cells.

Date: 2021
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DOI: 10.1038/s41467-021-23389-1

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