聚合物
聚合
高分子化学
有机太阳能电池
接受者
支化(高分子化学)
材料科学
分散性
能量转换效率
化学
光化学
有机化学
光电子学
凝聚态物理
物理
作者
Masayuki Wakioka,Naohiro Torii,Masahiko Saito,Itaru Osaka,Fumiyuki Ozawa
出处
期刊:ACS applied polymer materials
[American Chemical Society]
日期:2021-01-21
卷期号:3 (2): 830-836
被引量:16
标识
DOI:10.1021/acsapm.0c01163
摘要
While palladium-catalyzed direct arylation polymerization (DArP) is an easy and safe method to synthesize semiconducting polymers with alternating donor–acceptor units (DA polymers), branching and cross-linking defects arising from unintended side reactions are common. When these polymers are used as electronic materials in organic solar cells (OSCs) and similar devices, these defects may adversely affect device performance. We have recently shown that the side reactions can be inhibited by the simultaneous presence of two ligands, P(2-MeOC6H4)3 and N,N,N′,N′-tetramethylethylenediamine (TMEDA). In this study, an efficient donor polymer for OSCs (P1), based on 4,8-dithienylbenzo[1,2-b:4,5-b′]dithiophene (DTBDT) units, was prepared with this mixed-ligand method. The DA polymer is found to exhibit a well-controlled structure, with homocoupling defects of 2.0%, compared to 14.8% observed in the Migita–Stille product (P2). The power conversion efficiency (PCE) was 9.9% when P1 was used, compared to 9.8% for P2 in bulk-heterojunction-type OSC with a nonfullerene acceptor. This demonstrates the effectiveness of the DArP method as a clean and safe alternative method to synthesize DTBDT-based DA polymers for OSCs.
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