Large-area photovoltaics based on low band gap copolymers of thiophene and benzothiadiazole or benzo-bis(thiadiazole)

被引:96
作者
Bundgaard, E. [1 ]
Krebs, F. C. [1 ]
机构
[1] Riso Natl Lab, Danish Polymer Ctr, DK-4000 Roskilde, Denmark
关键词
low band gap polymers; large-area organic photovoltaic devices;
D O I
10.1016/j.solmat.2007.01.013
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Large-area solar cells (active area = 3 and 10cm(2)) were prepared with low band gap polymers based on thiophene and benzothiadiazole (1) or thiophene and benzo-bis(thiadiazole) (2). The band gaps of the polymers were 1.65 and 0.67 eV, respectively. The best photovoltaic performance was obtained for the device ITO/PEDOT/1:PCBM (1:2)/Al with an active area of 3 cm(2). The efficiency of the device was 0.62%. This is a high efficiency for a low band gap polymer in a large-area organic solar cell and thus polymer I is a very promising material for organic solar cells. The devices based on 2 were found to give poor devices when employed in bulk heterojunctions with PCBM. This was linked to a poor alignment of the energy levels in 2 with that of the electrodes and PCBM, showing that the requirement for a control of the positions of the energy levels becomes increasingly important as the band gap decreases. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:1019 / 1025
页数:7
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