Journal
POLYMER
Volume 54, Issue 2, Pages 607-613Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.12.006
Keywords
Indaceno[1,2-b:5,6-b ']dithiophene; Photovoltaic cells; Thieno[3,2-b]thiophene
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Funding
- National Natural Science Foundation of China [20704021, 61166002 U1174001]
- Gansu Province Natural Foundation [1107RJZA154, 1111RJDA009]
- Natural Science Foundation of Guangdong Province [S2011010003400]
- China Postdoctoral Science Foundation
- China Postdoctoral Science Special Foundation
- Lanzhou Jiaotong University
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An alternating conjugated polymer derived from 4,4,9,9-tetra(4-octyloxyphenyl)indaceno[1,2-b:5,6-b'] dithiophene and thieno[3,2-b]thiophene was synthesized by Stille coupling reaction. The copolymer shows extensive absorption from 360 nm to 590 nm with optical band gap of 2.12 eV. The highest occupied molecular orbit (HOMO) and the lowest unoccupied molecular orbit (LUMO) energy levels of the copolymer, determined by cyclic voltammetry (CV), are about -5.29 eV and -3.01 eV, respectively. A field-effect hole mobility of 8.1 x 10(-4) cm(2)/(V s) and an on/off ratio of 2.0 x 10(3) are obtained in the field-effect transistors based on the copolymer. The J(sc), V-oc and FF of the polymer photovoltaic cells (PVCs) based on the copolymer were enhanced simultaneously via the inserting of alcohol soluble conjugated polymer interlayer between active layer and metal cathode, and the maximal power conversion efficiency of 4.19% was achieved in the modified devices under an AM 1.5 simulator (100 mWcm(-2)). (C) 2012 Elsevier Ltd. All rights reserved.
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