Synthesis and Photovoltaic Properties of Low Band Gap Polymers Containing Benzo[1,2-b:4,5-c′]dithiophene-4,8-dione

被引：46

作者：

Cao, Jiamin ^{[1
,3
]}

Zhang, Wei ^{[1
]}

Xiao, Zuo ^{[1
]}

Liao, Lingyan ^{[1
]}

Zhu, Weiguo ^{[3
]}

Zuo, Qiqun ^{[2
]}

Ding, Liming ^{[1
]}

机构：

[1] Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China

[2] Jiahong Optoelect, Suzhou 215151, Peoples R China

[3] Xiangtan Univ, Coll Chem, Key Lab Environm Friendly Chem & Applicat, Minist Educ, Xiangtan 411105, Peoples R China

来源：

MACROMOLECULES | 2012年 / 45卷 / 03期

关键词：

CONJUGATED POLYMER; SOLAR-CELLS; DITHIENOSILOLE; SEMICONDUCTORS; POLYTHIOPHENES; EFFICIENCY; NETWORK; DESIGN;

D O I：

10.1021/ma202578y

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Two low-bandgap polymers P1 and P2 were synthesized by copolymerization of benzo[1,2-b:4,5-c']-dithiophene-4,8-dione (BDTD) with benzo-[1,2-b:4,5-b'] dithiophene (BDT) and dithieno[3,2- b:2',3'-d]silole (DTS), respectively. Thermogravimetric analyses of P1 and P2 were found and the temperature of 5% weight-loss was selected as the onset point of decomposition. Both the polymers are found to exhibit low-lying HOMO and good light-absorption properties. The absorption spectra of the polymers in chloroform and films are found to be of the range of 500-650 nm. The optimized weight ratios for P1 and P2 both are found to be 1:1.5. The AFM images show the morphology change for the polymer/PC61BM composite films and the rms roughness for the film is found to decrease from 6.94 to 0.47 nm. P2 device exhibits higher external quantum efficiency (EQE) than that of P1, which is due to stronger sunlight absorption of P2 film.

引用

页码：1710 / 1714

页数：5

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