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A Non‐Conjugated Polymer Acceptor for Efficient and Thermally Stable All‐Polymer Solar Cells
Author(s) -
Fan Qunping,
Su Wenyan,
Chen Shanshan,
Liu Tao,
Zhuang Wenliu,
Ma Ruijie,
Wen Xin,
Yin Zhihong,
Luo Zhenghui,
Guo Xia,
Hou Lintao,
MothPoulsen Kasper,
Li Yu,
Zhang Zhiguo,
Yang Changduk,
Yu Donghong,
Yan He,
Zhang Maojie,
Wang Ergang
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202005662
Subject(s) - conjugated system , polymer , acceptor , materials science , crystallinity , thermal stability , homo/lumo , energy conversion efficiency , band gap , photochemistry , polymer solar cell , chemical engineering , polymer chemistry , chemistry , molecule , organic chemistry , optoelectronics , composite material , physics , engineering , condensed matter physics
A non‐conjugated polymer acceptor PF1‐TS4 was firstly synthesized by embedding a thioalkyl segment in the mainchain, which shows excellent photophysical properties on par with a fully conjugated polymer, with a low optical band gap of 1.58 eV and a high absorption coefficient >10 5 cm −1 , a high LUMO level of −3.89 eV, and suitable crystallinity. Matched with the polymer donor PM6, the PF1‐TS4‐based all‐PSC achieved a power conversion efficiency (PCE) of 8.63 %, which is ≈45 % higher than that of a device based on the small molecule acceptor counterpart IDIC16. Moreover, the PF1‐TS4‐based all‐PSC has good thermal stability with ≈70 % of its initial PCE retained after being stored at 85 °C for 180 h, while the IDIC16‐based device only retained ≈50 % of its initial PCE when stored at 85 °C for only 18 h. Our work provides a new strategy to develop efficient polymer acceptor materials by linkage of conjugated units with non‐conjugated thioalkyl segments.