| Autor: |
Bai, Yang, Zhang, Ze, Zhou, Qiuju, Geng, Hua, Chen, Qi, Kim, Seoyoung, Zhang, Rui, Zhang, Cen, Chang, Bowen, Li, Shangyu, Fu, Hongyuan, Xue, Lingwei, Wang, Haiqiao, Li, Wenbin, Chen, Weihua, Gao, Mengyuan, Ye, Long, Zhou, Yuanyuan, Ouyang, Yanni, Zhang, Chunfeng |
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| Zdroj: |
Nature Communications; 5/22/2023, Vol. 14 Issue 1, p1-12, 12p |
| Abstrakt: |
With the power conversion efficiency of binary polymer solar cells dramatically improved, the thermal stability of the small-molecule acceptors raised the main concerns on the device operating stability. Here, to address this issue, thiophene-dicarboxylate spacer tethered small-molecule acceptors are designed, and their molecular geometries are further regulated via the thiophene-core isomerism engineering, affording dimeric TDY-α with a 2, 5-substitution and TDY-β with 3, 4-substitution on the core. It shows that TDY-α processes a higher glass transition temperature, better crystallinity relative to its individual small-molecule acceptor segment and isomeric counterpart of TDY-β, and a more stable morphology with the polymer donor. As a result, the TDY-α based device delivers a higher device efficiency of 18.1%, and most important, achieves an extrapolated lifetime of about 35000 hours that retaining 80% of their initial efficiency. Our result suggests that with proper geometry design, the tethered small-molecule acceptors can achieve both high device efficiency and operating stability. The variation on molecular topology and aggregation behaviour of tethered small molecule acceptors is critical to device operating performance. Here, the authors designed two isomeric dimers via the thiophene-core engineering and realize device efficiency of 18.1% and long stability in solar cells. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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