The optimization of π-bridge for trialkylsilyl substituted D-π-A photovoltaic polymers
The optimization of π-bridge for trialkylsilyl substituted D-π-A photovoltaic polymers
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三烷基甲硅烷基取代的D-pi-A光伏聚合物的pi桥优化
DOI：
10.1016/j.dyepig.2021.109609
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发表时间：
2021-10
影响因子：
4.5
通讯作者：
Zhou Erjun
中科院分区：
文献类型：
--
作者：
Du Mengzhen;Geng Yanfang;Ji Hongru;Li Gongqiang;Xiao Yuzhang;Zuo Kunyuan;Liu Yingliang;Guo Qiang;Tang Ailing;Zhou Erjun
Polymers with donor-π-acceptor (D-π-A) structure are widely used in organic solar cells (OSCs) because of their tunable optoelectronic properties. With the distinct 2D-conjugated structure and the s*(Si)–p*(C) bond interaction of the trialkylsilyl substitution, the electron-donating unit of 4,8-bis(5-(tripropylsilyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophenes (BDTT-Si) shows large potential to construct promising photovoltaic polymers. However, the studies of π-bridge in BDTT-Si-based polymers are not sufficient, and structure-properties relationship is still unclear. Here, we designed and synthesized three polymersPE7a,PE7bandPE7c, withBDTT-Siand difluorinated benzo[d] [1,2,3]triazole (BTA) as the D unit and A unit, respectively. By using thieno[3,2-b]thiophene (TT), TT with hexyl (C6-TT) and TT with undecyl (C11-TT) as the π-bridge, the solubility, crystallinity and optoelectronic properties of three polymers can be fine-tuned. When blended with the non-fullerene acceptorY6,PE7a-cshow different photovoltaic performance. The polymerPE7crealized the highest power conversion efficiency (PCE) of 11.4%, obviously higher than that (9.5%) ofJ71with thiophene as π-bridge. The results indicate that the introduction ofTTπ-bridge with suitable alkyl chain intoBDTT-Sicontaining polymer is an effective strategy to improve the photovoltaic performance.
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