Improved photovoltaic performance of two-dimensional low band-gap conjugated polymers with thieno[3,2-b]thiophene and diketopyrrolopyrrole units by altering pendent position of conjugated side chain

被引：19

作者：

Dang, Dongfeng ^{[1
]}

Zhou, Pei ^{[1
]}

Peng, Qing ^{[1
]}

He, Keqi ^{[1
]}

Jiang, Haigang ^{[1
]}

Yang, Pingao ^{[1
]}

Tan, Hua ^{[1
]}

Wang, Yafei ^{[1
]}

Liu, Yu ^{[1
]}

Lei, Gangtie ^{[1
]}

Zhu, Weiguo ^{[1
]}

机构：

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

来源：

DYES AND PIGMENTS | 2014年 / 109卷

基金：

中国国家自然科学基金; 湖南省自然科学基金;

关键词：

Polymer solar cells; Two-dimensional copolymers; Low band-gap; Thieno[3,2-b]thiophene; Pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione; Hole mobility; FIELD-EFFECT TRANSISTORS; ORGANIC SOLAR-CELLS; RATIONAL DESIGN; COPOLYMER; MOBILITY;

D O I：

10.1016/j.dyepig.2014.04.041

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Two-dimensional low band-gap copolymers of P1 and P2 with a framework of (2,5-di(thiophen-2-yl) thieno[3,2-b]thiophene)-alt-(2,5-bis(2-ethylhexyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4( 2H,5H)-dione) (DTTT-alt-DTPP) were synthesized, in which two 2,3-dioctylthiophene-5-yl groups were pended into the 3-positions of two thiophenyl rings close to the thieno[3,2-b]thiophene (TT) unit for P1 and the 3, 6-positions of the TT unit for P2, respectively. The influence of pending positions on optophysical and photovoltaic properties were studied. Similar broad absorption spectra from 350 to 950 nm were observed with a low band-gap of 1.25 eV. However, significantly different photovoltaic properties were obtained in the bulk heterojunction polymer solar cells with a device structure of ITO/PEDOT:PSS/active layer/LiF/Al. The P1-based devices showed a power conversion efficiency (PCE) of 0.79%, but the P2-based devices displayed a notably increasing PCE up to 2.12% under an AM 1.5G irradiation with an intensity of 100 mW cm(-2). Our results indicate that altering pendent position of alkyl thiophene is effective way to improve the photovoltaic properties for the two-dimensional copolymers. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：6 / 12

页数：7

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