The optimization of π-bridge for trialkylsilyl substituted D-π-A photovoltaic polymers

被引：14
作者：
Du, Mengzhen [1 ,2 ]
Geng, Yanfang [2 ]
Ji, Hongru [3 ,4 ]
Li, Gongqiang [3 ,4 ]
Xiao, Yuzhang [1 ,2 ]
Zuo, Kunyuan [1 ,2 ]
Liu, Yingliang [1 ]
Guo, Qiang [1 ]
Tang, Ailing [2 ]
Zhou, Erjun [2 ]
机构：
[1] Zhengzhou Univ, Sch Mat Sci & Engn, Henan Inst Adv Technol, Zhengzhou 450001, Peoples R China
[2] Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Nanosyst & Hierarch Fabricat, Beijing 100190, Peoples R China
[3] Nanjing Tech Univ, Key Lab Flexible Elect KLOFE, Nanjing 211816, Peoples R China
[4] Nanjing Tech Univ, Inst Adv Mat IAM, Nanjing 211816, Peoples R China
来源：
DYES AND PIGMENTS | 2021年 / 194卷
基金：
中国国家自然科学基金;
关键词：
Nonfullerne acceptor; Organic solar cells; Photovoltaic; thieno[3,2-b]thiophene; D-pi-A copolymer; SOLAR-CELLS; CONJUGATED POLYMERS; EFFICIENCY; ACCEPTOR; COPOLYMER; ACHIEVE; DESIGN; LEVEL; BAND;
D O I：
10.1016/j.dyepig.2021.109609
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Polymers with donor-pi-acceptor (D-pi-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 pi-bridge in BDTT-Si-based polymers are not sufficient, and structure-properties relationship is still unclear. Here, we designed and synthesized three polymers PE7a, PE7b and PE7c, with BDTT-Si and 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 (C-6-TT) and TT with undecyl (C-11-TT) as the pi-bridge, the solubility, crystallinity and optoelectronic properties of three polymers can be fine-tuned. When blended with the non-fullerene acceptor Y6, PE7a-c show different photovoltaic performance. The polymer PE7c realized the highest power conversion efficiency (PCE) of 11.4%, obviously higher than that (9.5%) of J71 with thiophene as pi-bridge. The results indicate that the introduction of TT pi-bridge with suitable alkyl chain into BDTT-Si containing polymer is an effective strategy to improve the photovoltaic performance.
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页数：9
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