Organic solar cells using oligomer acceptors for improved stability and efficiency

Youcai Liang, Difei Zhang, Zerun Wu, Tao Jia, Larry Lüer, Haoran Tang, Ling Hong, Jiabin Zhang, Kai Zhang, Christoph J. Brabec, Ning Li () and Fei Huang ()
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Youcai Liang: South China University of Technology
Difei Zhang: South China University of Technology
Zerun Wu: South China University of Technology
Tao Jia: South China University of Technology
Larry Lüer: Friedrich-Alexander-Universität Erlangen-Nürnberg
Haoran Tang: South China University of Technology
Ling Hong: South China University of Technology
Jiabin Zhang: South China University of Technology
Kai Zhang: South China University of Technology
Christoph J. Brabec: Friedrich-Alexander-Universität Erlangen-Nürnberg
Ning Li: South China University of Technology
Fei Huang: South China University of Technology

Nature Energy, 2022, vol. 7, issue 12, 1180-1190

Abstract: Abstract The power conversion efficiencies of organic solar cells (OSCs) have reached over 19%. However, the combination of high efficiency and long-term stability is still a major conundrum of commercialization. Here a Y6-analogue and a 2,2′-bithiophene unit are utilized to construct a series of oligomer acceptors to investigate the effect of molecular size and packing properties on photovoltaic performance. By altering the molecular chain length, we modify the thermal properties, crystallization behaviours and molecular packing and achieve an optimal microstructure and a more stable morphology in blend films. A combination of efficiencies over 15% and an extrapolated T80 lifetime over 25,000 h, which equates to an average lifetime exceeding 16 years in Guangzhou, is achieved for binary OSCs based on an oligomer acceptor. This work emphasizes the importance of oligomeric strategy in tuning molecular packing behaviours and blend morphology, leading to development of novel non-fullerene acceptors for stable and efficient OSCs.

Date: 2022
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DOI: 10.1038/s41560-022-01155-x

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