Morphology Evolution of Spin-Coated Films of Poly(thiophene-phenylene-thiophene) and [6,6]-Phenyl-C71-butyric Acid Methyl Ester by Solvent Effect

被引:57
作者
Chan, Shu-Hua [1 ,2 ]
Hsiao, Yu-Sheng [1 ]
Hung, Ling-I [1 ]
Hwang, Gue-Wuu [1 ]
Chen, Hsin-Lung [2 ]
Ting, Ching [1 ]
Chen, Chih-Ping [1 ]
机构
[1] Ind Technol Res Inst, Mat & Chem Labs, Hsinchu 310, Taiwan
[2] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 30013, Taiwan
关键词
POLYMER SOLAR-CELLS; EFFICIENCY;
D O I
10.1021/ma1000157
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This paper describes the influence of the solvent on the morphological evolution and performance of polymer solar cells (PSCs) based on blended films of poly(thiophene-phenylene-thiophene) and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM). The blends are spin-coated with solvents exhibiting various evaporation rates, including o-dichlorobenzene (DCB), chlorobenzene (CB), chloroform (CF), and tetralin. The changing morphologies of these blended films are monitored using atomic force microscopy (AFM) and transmission electron microscopy (TEM). A solvent having a higher boiling point [1,8-octanedithiol (OT)] is also introduced as an additive to further fine-tune the morphology of the bulk heterojunction (BHJ). We demonstrate herein that the morphology of a blend and, hence, the performance of a BHJ device-can be manipulated by controlling the rate of solvent evaporation during film formation. The resulted fine-scale phase separation leads to enhanced performance of such organic photovoltaic devices. The highest power efficiency for our PSCs (5.8%, AM 1.5G irradiation (100 mW/cm(2))) resulted when we use DCB as the solvent with OT as a processing additive.
引用
收藏
页码:3399 / 3405
页数:7
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