Synthesis and Photovoltaic Properties of Copolymers Based on Bithiophene and Bithiazole

被引：18

作者：

Zhang, Maojie ^{[1
,2
]}

Fan, Haijun ^{[1
,2
]}

Guo, Xia ^{[1
]}

Yang, Yang ^{[1
]}

Wang, Shanshan ^{[1
]}

Zhang, Zhi-Guo ^{[1
]}

Zhang, Jing ^{[1
,2
]}

Zhan, Xiaowei ^{[1
]}

Li, Yongfang ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2011年 / 49卷 / 12期

关键词：

bithiazole; bithiophene; conjugated polymers; D-A copolymers; polymer solar cells; EFFECT CARRIER MOBILITY; BULK-HETEROJUNCTION; ELECTROCHEMICAL PROPERTIES; CONJUGATED POLYMERS; OPTICAL-PROPERTIES; THIOPHENE; EFFICIENCY; CELLS; BAND; BENZOTHIADIAZOLE;

D O I：

10.1002/pola.24708

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Three simple structured D-A copolymers, PBTBTz-1, PBTBTz-2, and PBTBTz-3, containing bithiophene (BT) donor unit and bithiazole (BTz) acceptor unit with different alkyl chain length were synthesized by the Pd-catalyzed Stille-coupling method. The copolymers were characterized by thermogravimetric analysis, UV-vis absorption, electrochemical cyclic voltammetry, and photovoltaic measurements. The results indicate that the introduction of BTz unit to the polythiophene main chain effectively decreases highest occupied molecular orbital levels of the copolymers and increases the open circuit voltage (V-oc) of polymer solar cells (PSCs) based on the copolymers as donor, and the alkyl chain length influences the photovoltaic properties of the polymers significantly. The PSCs based on PBTBTz-2 and PBTBTz-3 show higher Voc up to 0.77 and 0.81 V, respectively. The power conversion efficiency of the PSC based on PBTBTz-2: PC70BM 1:1(w/w) reached 2.58% with short circuit current of 8.70 mA/cm(2), under the illumination of AM1.5, 100 mW/cm(2). (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 2746-2754, 2011

引用

页码：2746 / 2754

页数：9

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