Effects of the Molecular Weight and the Side-Chain Length on the Photovoltaic Performance of Dithienosilole/Thienopyrrolodione Copolymers

被引：230
|
作者：
Chu, Ta-Ya [1 ]
Lu, Jianping [1 ]
Beaupre, Serge [2 ]
Zhang, Yanguang [1 ]
Pouliot, Jean-Remi [2 ]
Zhou, Jiayun [1 ]
Najari, Ahmed [2 ]
Leclerc, Mario [2 ]
Tao, Ye [1 ]
机构：
[1] Natl Res Council Canada NRC, IMS, Ottawa, ON K1A 0R6, Canada
[2] Univ Laval, Dept Chim, Quebec City, PQ G1V 0A6, Canada
来源：
ADVANCED FUNCTIONAL MATERIALS | 2012年 / 22卷 / 11期
关键词：
photovoltaic devices; solar cells; fullerenes; polymeric materials; POLYMER SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; PHASE-SEPARATION; EFFICIENCY; ENHANCEMENT; MORPHOLOGY; NETWORK; DONOR;
D O I：
10.1002/adfm.201102623
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A series of low-bandgap alternating copolymers of dithienosilole and thienopyrrolodione (PDTSTPDs) are prepared to investigate the effects of the polymer molecular weight and the alkyl chain length of the thienopyrrole-4,6-dione (TPD) unit on the photovoltaic performance. High-molecular-weight PDTSTPD leads to a higher hole mobility, lower device series resistance, a larger fill factor, and a higher photocurrent in PDTSTPD:[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) bulk-heterojunction solar cells. Different side-chain lengths show a significant impact on the interchain packing between polymers and affect the blend film morphology due to different solubilities. A high power conversion efficiency of 7.5% is achieved for a solar cell with a 1.0 cm2 active area, along with a maximum external quantum efficiency (EQE) of 63% in the red region.
引用
收藏
页码：2345 / 2351
页数：7
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