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A novel electrochemically and thermally stable polythiophene for photovoltaic application

Authors

  • Muddasir Hanif,

    1. MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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  • Lijian Zuo,

    1. MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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  • Quanxiang Yan,

    1. MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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  • Xiaolian Hu,

    1. MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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  • Minmin Shi,

    Corresponding author
    1. MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
    • MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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  • Hongzheng Chen

    1. MOE Key Laboratory of Macromolecule Synthesis and Functionalization, State Key Lab of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China
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Abstract

Conjugated polymers having good electrochemical and thermal stability are highly desired in optoelectronics. We report a new polythiophene consisting of alternating 4,4′-didodecyl-2,2′-bithiophene and terthiophene units (HPL1) synthesized via Stille coupling reaction. The optical band gap of HPL1 (1.92 eV) is similar to that of regioregular poly(3-hexylthiophene) (rr-P3HT, 1.89 eV). In comparison to rr-P3HT, the HPL1 when subjected to the cyclic voltammetry as thin film shows much superior electrochemical stability and a lower highest occupied molecular orbital energy level (−4.87 eV for rr-P3HT and −4.95 eV for HPL1). The transient photoluminescence study of HPL1 and rr-P3HT shows that both materials have two exciton decay processes, and the excitons of rr-P3HT are quenched more quickly. The onset decomposition, Td for rr-P3HT (465°C) is 4°C lower than HPL1 (469°C). Preliminary photovoltaic study disclosed that the polymer solar cell based on HPL1:[6,6]-phenyl-C61-butyric acid methyl ester blend showed a power conversion efficiency of 0.63%, with a Voc of 0.6 V, and a short circuit current (Jsc) of 2.79 mA cm−2 under AM 1.5 illumination (100 mW cm−2). The whole study provided an important example to design new electrochemically and thermally stable polymers with longer exciton life time for application in bulk heterojunction polymer solar cells. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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