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Issue 26, 2015
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Synthesis and photovoltaic properties of dithieno[3,2-b:2′,3′-d]silole-based conjugated copolymers

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Abstract

A new low band gap conjugated polymer containing a dithieno[3,2-b:2′,3′-d]silole (DTS) donor unit and a fluorinated 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTffBT) acceptor unit was synthesized by Stille cross-coupling polymerization. The structural and thermal properties of the copolymer were characterized by using nuclear magnetic resonance, gel permeation chromatography and thermogravimetric analysis. This copolymer shows good thermal stability with a decomposition temperature of 325 °C and a broad absorption band from 300 to 800 nm. The HOMO and LUMO energy levels were estimated to be −5.28 and −3.66 eV, with an electrochemical band gap of 1.62 eV. Efficient bulk heterojunction solar cells were fabricated by blending this copolymer with PC71BM, and they reached a power conversion efficiency up to 5.26% under 100 mW cm−2 AM 1.5 illumination, indicating that PDTS–DTffBT is a potential candidate for polymer solar cells.

Graphical abstract: Synthesis and photovoltaic properties of dithieno[3,2-b:2′,3′-d]silole-based conjugated copolymers

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Publication details

The article was received on 27 Feb 2015, accepted on 19 May 2015 and first published on 21 May 2015


Article type: Paper
DOI: 10.1039/C5TA01523E
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J. Mater. Chem. A, 2015,3, 13794-13800

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    Synthesis and photovoltaic properties of dithieno[3,2-b:2′,3′-d]silole-based conjugated copolymers

    S. Wen, C. Wang, P. Ma, Y. Zhao, C. Li and S. Ruan, J. Mater. Chem. A, 2015, 3, 13794
    DOI: 10.1039/C5TA01523E

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