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Liu, Bin; Sun, Huiliang; Lee, Jin-Woo; Jiang, Zhengyan; Qiao, Junqin; Wang, Junwei; Yang, Jie; Feng, Kui; Liao, Qiaogan; An, Mingwei; Li, Bolin; Han, Dongxue; Xu, Baomin; Lian, Hongzhen; Niu, Li; Kim, Bumjoon J; Guo, Xugang
Nature communications, 02/2023, Volume: 14, Issue: 1Journal Article
Degradation of the kinetically trapped bulk heterojunction film morphology in organic solar cells (OSCs) remains a grand challenge for their practical application. Herein, we demonstrate highly thermally stable OSCs using multicomponent photoactive layer synthesized via a facile one-pot polymerization, which show the advantages of low synthetic cost and simplified device fabrication. The OSCs based on multicomponent photoactive layer deliver a high power conversion efficiency of 11.8% and exhibit excellent device stability for over 1000 h (>80% of their initial efficiency retention), realizing a balance between device efficiency and operational lifetime for OSCs. In-depth opto-electrical and morphological properties characterizations revealed that the dominant PM6-b-L15 block polymers with backbone entanglement and the small fraction of PM6 and L15 polymers synergistically contribute to the frozen fine-tuned film morphology and maintain well-balanced charge transport under long-time operation. These findings pave the way towards the development of low-cost and long-term stable OSCs.
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