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

页码：2345 / 2351

页数：7

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