Effects of side-chains on low band gap polymer photovoltaic devices

被引：0

作者：

Yao, Yan ^{[1
]}

Shi, Chenjun ^{[1
]}

Pei, Qibing ^{[1
]}

Yang, Yang ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

来源：

ORGANIC PHOTOVOLTAICS VII | 2006年 / 6334卷

关键词：

low band gap polymer photovoltaic device; side-chains; thermal annealing;

D O I：

10.1117/12.683077

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The effect of side-chains on the molecular weight and the optical and electrical property of a low band gap copolymer poly {(9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-decyloxythien-2-yl)-2,1,3-benzothiadiazole]-5',5"-diyl} (PF-co-DTB) was studied. The decyloxy side-chains help to increase molecular weight (Mw = 115,000) and decrease the band gap (1.78 eV) as well as the oxidation potential (-5.4 eV). Zero-field mobility of 2x10(-5) cm(2)/VS is measured in hole-only devices. Photovoltaic devices based on PF-co-DTB/fullerene bulk-heterojunction show power conversion efficiency of up to 1.6% under air mass 1.5G, 100 mW/cm(2) illumination. The studies of effects of side-chains on the photovoltaic devices show the trade-off between short circuit current increase and open-circuit voltage drop. Thermal annealing on device performance is also discussed.

引用

页数：5

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