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Synthesis and characterization of novel poly(aryleneethynylene)s derived from squaraines for photovoltaic applications

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Abstract

Two novel π-conjugated polymers composed of alkyl carbazole/dialkoxyphenylene and squaraine units were synthesized by Sonogashira cross-coupling reactions. The structures and properties of these copolymers were characterized using FT-IR, NMR, UV–Vis, gel permeation chromatography and cyclic voltammetry (CV). Both polymers possess adequate thermal stability and exhibit good solubility in common organic solvents such as chloroform, THF, and toluene. The polymer films show intense and broad visible and near IR absorption with the long wavelength absorption maximum peaks of 796 and 851 nm for P1 and P2, respectively, which are apparently red-shifted compared with poly(phenyleneethynylene). CV studies reveal that the band gaps of these copolymers are about 1.45 eV, implying that the resulted polymers may be promising candidates for solar cells.

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Acknowledgements

This study was supported by the key foundation of education ministry of China (20070610053) and Sichuan Province Foundation for Youths (2008JY0050). The authors also acknowledge the Analytical & Testing Center of Sichuan University for the NMR measurements.

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Authors and Affiliations

  1. College of Chemistry, Sichuan University, Chengdu, 610064, China

    Wei Zhang, Feng Tao, Kai-ge Meng, Zheng Wang, Long-yi Xi, Ying Li & Qing Jiang

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  1. Wei Zhang
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  2. Feng Tao
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  3. Kai-ge Meng
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  4. Zheng Wang
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  5. Long-yi Xi
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  6. Ying Li
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  7. Qing Jiang
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Correspondence to Ying Li.

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Zhang, W., Tao, F., Meng, Kg. et al. Synthesis and characterization of novel poly(aryleneethynylene)s derived from squaraines for photovoltaic applications. J Mater Sci 46, 5363–5370 (2011). https://doi.org/10.1007/s10853-011-5474-z

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