Статья

Ductile Oligomeric Acceptor‐Modified Flexible Organic Solar Cells Show Excellent Mechanical Robustness and Near 18% Efficiency

Qinrui YeCenter of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 ChinaZhenyu ChenCenter of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 ChinaDaobin YangCenter of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 ChinaWei SongCenter of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 ChinaJintao ZhuDepartment of Chemical and Environmental Engineering University of Nottingham Ningbo China Ningbo 315100 ChinaShuncheng YangZhejiang Engineering Research Center for Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 ChinaJinfeng GeCenter of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 ChinaFei ChenDepartment of Chemical and Environmental Engineering University of Nottingham Ningbo China Ningbo 315100 ChinaZiyi GeCenter of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

2023en

ABI

Аннотация

Abstract High power conversion efficiency (PCE) and mechanical robustness are key requirements for wearable applications of organic solar cells (OSCs). However, almost all highly efficient photoactive films comprising polymer donors (P D ) and small molecule acceptors (SMAs) are mechanically brittle. In this study, highly efficient (PCE = 17.91%) and mechanically robust (crack‐onset strain [COS] = 11.7%) flexible OSCs are fabricated by incorporating a ductile oligomeric acceptor (DOA) into the P D :SMA system, representing the most flexible OSCs to date. The photophysical, mechanical, and photovoltaic properties of D18:N3 with different DOAs are characterized. By introducing DOA DOY‐C4 with a longer flexible alkyl linker and lower polymerization, the D18:N3:DOY‐C4‐based flexible OSCs exhibit a significantly higher PCE (17.91%) and 50% higher COS (11.7%) than the D18:N3‐based device (PCE = 17.06%, COS = 7.8%). The flexible OSCs based on D18:N3:DOY‐C4 retain 98% of the initial PCE after 2000 consecutive bending cycles, showing greater mechanical stability than the reference device (maintaining 89% of initial PCE). After careful investigation, it is hypothesized that the enhancement in mechanical properties is mainly due to the formation of tie chains or entanglement in the ternary blend films. These results demonstrate that DOAs have great potential for achieving high‐performance flexible OSCs.

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Идентификаторы

DOI: 10.1002/adma.202305562

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar