New TIPS-substituted benzo[1,2-b:4,5-b′]dithiophene-based copolymers for application in polymer solar cells
作者:Chinna Bathula、Chang Eun Song、Sachin Badgujar、Seong-Jin Hong、In-Nam Kang、Sang-Jin Moon、Jaemin Lee、Shinuk Cho、Hong-Ku Shim、Sang Kyu Lee
DOI:10.1039/c2jm33466f
日期:——
Novel triisopropylsilylethynyl (TIPS)-substituted benzodithiophene-based copolymers, poly[4,8-bis(triisopropylsilylethynyl)benzo[1,2-b:4,5-bâ²]dithiophene-2,6-diyl-alt-4,6-(2-ethylhexyl-thieno[3,4-b]thiophene-2-carboxylate)] (P1), poly[4,8-bis(triisopropylsilylethynyl)benzo[1,2-b:4,5-bâ²]dithiophene-2,6-diyl-alt-[4,6-(1-thieno[3,4-b]thiophen-2-yl)-2-ethylhexan-1-one}] (P2), and poly[4,8-bis(triisopropylsilylethynyl)benzo[1,2-b:4,5-bâ²]dithiophene-2,6-diyl-alt-4,6-(2-ethylhexyl(3-fluorothieno[3,4-b]thiophene)-2-carboxylate)] (P3), were designed and synthesized for use in polymer solar cells (PSCs). We describe the effects of the different acceptor segment side groups on the optical, electrochemical, field-effect hole mobility, and photovoltaic characteristics of the resulting TIPS-based copolymers. The side groups in the copolymers were found to significantly influence the carrier mobilities and photovoltaic properties of the copolymers. The field-effect mobilities of the holes varied from 9 Ã 10â5 cm2 Vâ1 sâ1 in P2 to 3 Ã 10â3 cm2 Vâ1 sâ1 in P1. Under optimized conditions, the TIPS-based polymers showed power conversion efficiencies (PCEs) for the PSCs in the range of 3.16â5.76%. Among the TIPS-based copolymers studied here, P1 showed the best photovoltaic performance, with an open-circuit voltage (Voc) of 0.82 V, a short-circuit current density (Jsc) of 12.75 mA cmâ2, a fill factor (FF) of 0.55, and a power-conversion efficiency of 5.76% using a P1:PC71BM blend film as the active layer under AM 1.5G irradiation (100 mW cmâ2).
条件下,在聚合物太阳能电池(PSCs)中,设计并合成了用于聚合物太阳能电池(PSCs)的新型
三异丙基硅乙炔(
TIPS)取代苯并二
噻吩基共聚物,即聚[4,8-双(
三异丙基硅乙炔)苯并[1,2-b:4,5-b²]二
噻吩-2,6-二基-alt-4,6-(2-乙基己基-
噻吩[3,4-b]
噻吩-2-
羧酸酯)](P1)、聚[