A benzo[1,2-b: 4,5-b′]difuran- and thieno-[3,4-b]thiophene-based low bandgap copolymer for photovoltaic applications

被引：37

作者：

Liu, Bo ^{[1
,2
]}

Chen, Xuewen ^{[2
]}

Zou, Yingping ^{[1
,2
,3
]}

He, Yuehui ^{[1
]}

Xiao, Lu ^{[2
]}

Xu, Xinjun ^{[4
]}

Li, Lidong ^{[4
]}

Li, Yongfang ^{[5
]}

机构：

[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China

[3] Cent S Univ, Inst Super Microstruct & Ultrafast Proc, Changsha 410083, Hunan, Peoples R China

[4] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

[5] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

来源：

POLYMER CHEMISTRY | 2013年 / 4卷 / 03期

基金：

中国博士后科学基金;

关键词：

SOLAR-CELLS; PERFORMANCE; POLYMERS; ACCEPTOR; UNIT;

D O I：

10.1039/c2py20580g

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A new low bandgap conjugated polymer-PBDFTT-C was synthesized from thieno-[3,4-b] thiophene and benzo[1,2-b:4,5-b'] difuran units by Stille coupling reactions. The structure was verified by H-1 NMR and elemental analysis, the molecular weight was determined by gel permeation chromatography (GPC) and the thermal properties were investigated by thermogravimetric analysis (TGA). PBDFTT-C showed a low HOMO energy level of -5.27 eV. The polymer film displayed broad absorption in the wavelength region from 300 nm to 840 nm with a low bandgap of 1.48 eV. The field effect hole mobility of PBDFTT-C reached 5.4 x 10(-3) cm(2) V-1 s(-1). By using 1,8-diiodooctane (DIO) as the solvent additive, photovoltaic cells with the structure of ITO/PEDOT:PSS/PBDFTT-C:PC71BM (1 : 1.5, w/w)/Ca/Al demonstrated a power conversion efficiency of 4.4% with a short circuit current of 10.45 mA cm(-2), open circuit voltage of 0.66 V and a fill factor of 0.64, under the illumination of AM 1.5G, 100 mW cm(-2).

引用

页码：470 / 476

页数：7

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