Mechanically robust and stretchable organic solar cells plasticized by small-molecule acceptors

• 成果类型: Article
• 署名作者: Wang, Zhenye; Zhang, Di; Yang, Lvpeng; Allam, Omar; Gao, Yerun; Su, Yang; Xu, Meichen; Mo, Songmin; Wu, Qinghe; Wang, Zhi; Liu, Junfeng; He, Jiayi; Li, Rui; Jia, Xingwang; Li, Zhilin; Yang, Long; Weber, Mark D.; Yu, Yu; Zhang, Xinliang; Marks, Tobin J.; Stingelin, Natalie; Kacher, Josh; Jang, Seung Soon; Facchetti, Antonio; Shao, Ming
• 署名单位: Huazhong University of Science & Technology; University System of Georgia; Georgia Institute of Technology; University System of Georgia; Georgia Institute of Technology; Shantou University; Shantou University; Northwestern University; Northwestern University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9544
• DOI: 10.1126/science.adp9709
• 发表日期: 2025-01-24
• 页码: 381-387
• 关键词: electronic population analysis; all-polymer; simultaneous enhancement; wave functions; performance; lcao; intercalation; cohesion; weight; blends

摘要

Emerging wearable devices would benefit from integrating ductile photovoltaic light-harvesting power sources. In this work, we report a small-molecule acceptor (SMA), also known as a non-fullerene acceptor (NFA), designed for stretchable organic solar cell (s-OSC) blends with large mechanical compliance and performance. Blends of the organosilane-functionalized SMA BTP-Si4 with the polymer donor PNTB6-Cl achieved a power conversion efficiency (PCE) of >16% and ultimate strain (epsilon(u)) of >95%. Typical SMAs suppress OSC blend ductility, but the addition of BTP-Si4 enhances it. Although BTP-Si4 is less crystalline than other SMAs, it retains considerable electron mobility and is highly miscible with PNTB6-Cl and is essential for enhancing epsilon(u). Thus, s-OSCs with PCE > 14% and operating normally under various deformations (>80% PCE retention under an 80% strain) were demonstrated. Analysis of several SMA-polymer blends revealed general molecular structure-miscibility-stretchability relationships for designing ductile blends.