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Synthesis and properties of copolymers based on 5,6-dinitrobenzothiadiazole with low band gap and broad absorption spectra

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Abstract

One polythiophene derivative PT3T and two low band gap copolymers, PBTT-T3T and PBTT, with different ratios of 5,6-dinitrobenzothiadiazole as the acceptor unit in the polymer backbone have been synthesized by Pd-catalyzed Stille-coupling polymerizations. Thermal stability, X-ray diffraction analyses, UV-vis absorption spectra, photoluminescence spectra and electrochemical properties of the copolymers were investigated. The band gap estimated from UV-vis-NIR spectra of the copolymers films varied from 1.39 to 1.94 eV. Among these copolymers, the films of PBTT-T3T and PBTT, which contain the 5,6-dinitrobenzothiadiazole unit, cover a broad wavelength range in the visible and near-infrared region from 400 to 1000 nm with the maximal peak absorption around 700 nm, which is exactly matched with the maximum in the photon flux of the sun.

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Authors and Affiliations

  1. Key Laboratory for Functional Polymer Materials and Centre for Nanoscale Science and Technology, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China

    Fei Wang, YongSheng Liu, XiangJian Wan, JiaoYan Zhou & YongSheng Chen

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  1. Fei Wang
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  2. YongSheng Liu
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  3. XiangJian Wan
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Correspondence to YongSheng Chen.

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Wang, F., Liu, Y., Wan, X. et al. Synthesis and properties of copolymers based on 5,6-dinitrobenzothiadiazole with low band gap and broad absorption spectra. Sci. China Chem. 54, 617–624 (2011). https://doi.org/10.1007/s11426-011-4244-8

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