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Advanced Devices for Energy Conversion

Journals

Advanced Energy Materials
년도 2024
학술지명 Advanced Energy Materials
논문명 Design of Star-Shaped Trimer Acceptors for High-Performance (Efficiency > 19%), Photostable, and Mechanically Robust Organic Solar Cells
게재권/집 14/8
수록페이지 2303872
저자명 Jin-Woo Lee†, Cheng Sun†, Jinho Lee, Dong Jun Kim, Won Jung Kang, Seungbok Lee, Donguk Kim, Jinseok Park, Tan Ngoc-Lan Phan, Zhengping Tan, Felix Sunjoo Kim, Jung-Yong Lee, Xichang Bao, Taek-Soo Kim, Yun-Hi Kim*, and Bumjoon J. Kim*
Link 관련링크 https://doi.org/10.1002/aenm.202303872 243회 연결

Abstract 


High power conversion efficiency (PCE), long-term stability, and mechanical robustness are prerequisites for the commercial applications of organic solar cells (OSCs). In this study, a new star-shaped trimer acceptor (TYT-S) is developed and high-performance OSCs with a PCE of 19.0%, high photo-stability (t80% lifetime = 2600 h under 1-sun illumination), and mechanical robustness with a crack-onset strain (COS) of 21.6% are achieved. The isotropic molecular structure of TYT-S affords efficient multi-directional charge transport and high electron mobility. Furthermore, its amorphous structure prevents the formation of brittle crystal-to-crystal interfaces, significantly enhancing the mechanical properties of the OSC. As a result, the TYT-S-based OSCs demonstrate a significantly higher PCE (19.0%) and stretchability (COS = 21.6%) than the linear-shaped trimer acceptor (TYT-L)-based OSCs (PCE = 17.5% and COS = 6.4%) and the small-molecule acceptor (MYT)-based OSCs (PCE = 16.5% and COS = 1.3%). In addition, the increased molecular size of TYT-S, relative to that of MYT and dimer (DYT), suppresses the diffusion kinetics of the acceptor molecules, substantially improving the photostability of the OSCs. Finally, to effectively demonstrate the potential of TYT-S, intrinsically stretchable (IS)-OSCs are constructed. The TYT-S-based IS-OSCs exhibit high device stretchability (strain at PCE80% = 31%) and PCE of 14.4%.