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X-Shaped Oligothiophenes as a New Class of Electron Donors for Bulk-Heterojunction Solar Cells

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Download Hi-Res ImageDownload to MS-PowerPointCite This:J. Phys. Chem. B 2006, 110, 15, 7702-7707
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    X-Shaped Oligothiophenes as a New Class of Electron Donors for Bulk-Heterojunction Solar Cells
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    Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China, and Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, Changchun 130012, P. R. China
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    The Journal of Physical Chemistry B

    Cite this: J. Phys. Chem. B 2006, 110, 15, 7702–7707
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    https://doi.org/10.1021/jp060128o
    Published March 24, 2006
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    Abstract

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    Four X-shaped oligothiophenes with different conjugation length were investigated as novel electron donors in single-layer bulk-heterojunction solar cells. The UV−vis absorption spectra of blends of compounds 1−4 with 1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C61 show a remarkably red shift and broadening with increasing thiophene number at each of the four branches. The performance of the photovoltaic cells varied significantly with molecular structures of the four oligothiophenes. Conversion efficiencies increased from 0.008% to 0.8% with changing the electron donors from 1 to 4. The maximum incident photon-to-current conversion efficiency of the device based on 4 reaches 31.6%, much higher than those of three other compounds 1−3. Remarkable improvement of the device performance was achieved with increasing the substituted thiophene number. The results show that the photovoltaic effect is dependent on the structural characteristics and the film forming abilities of the X-shaped thiophenes.

    Copyright © 2006 American Chemical Society

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    †

     Institute of Chemistry, Chinese Academy of Sciences.

    ‡

     Jilin University.

    *

     Address correspondence to these authors. E-mail:  [email protected] (Y.Q.L.), [email protected] (W.J.T.).

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    This article is cited by 118 publications.

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    Cite this: J. Phys. Chem. B 2006, 110, 15, 7702–7707
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