Efficient and thermally stable organic solar cells based on small molecule donor and polymer acceptor

Zijian Zhang, Junhui Miao, Zicheng Ding (), Bin Kan, Baojun Lin, Xiangjian Wan, Wei Ma (), Yongsheng Chen (), Xiaojing Long, Chuandong Dou, Jidong Zhang, Jun Liu () and Lixiang Wang
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Zijian Zhang: Chinese Academy of Sciences
Junhui Miao: Chinese Academy of Sciences
Zicheng Ding: Chinese Academy of Sciences
Bin Kan: Nankai University
Baojun Lin: Xi’an Jiaotong University
Xiangjian Wan: Nankai University
Wei Ma: Xi’an Jiaotong University
Yongsheng Chen: Nankai University
Xiaojing Long: Chinese Academy of Sciences
Chuandong Dou: Chinese Academy of Sciences
Jidong Zhang: Chinese Academy of Sciences
Jun Liu: Chinese Academy of Sciences
Lixiang Wang: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Efficient organic solar cells (OSCs) often use combination of polymer donor and small molecule acceptor. Herein we demonstrate efficient and thermally stable OSCs with combination of small molecule donor and polymer acceptor, which is expected to expand the research field of OSCs. Typical small molecule donors show strong intermolecular interactions and high crystallinity, and consequently do not match polymer acceptors because of large-size phase separation. We develop a small molecule donor with suppressed π-π stacking between molecular backbones by introducing large steric hindrance. As the result, the OSC exhibits small-size phase separation in the active layer and shows a power conversion efficiency of 8.0%. Moreover, this OSC exhibits much improved thermal stability, i.e. maintaining 89% of its initial efficiency after thermal annealing the active layer at 180 °C for 7 days. These results indicate a different kind of efficient and stable OSCs.

Date: 2019
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DOI: 10.1038/s41467-019-10984-6

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