Poly(3-hexylselenophene) solar cells: Correlating the optoelectronic device performance and nanomorphology imaged by low-energy scanning Transmission electron microscopy

Authors

  • Michael F. G. Klein,

    Corresponding author
    1. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraβe 13, 76131 Karlsruhe, Germany
    • Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraβe 13, 76131 Karlsruhe, Germany
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  • Marina Pfaff,

    1. Laboratory for Electron Microscopy (LEM), KIT, Engesserstraβe 7, 76131 Karlsruhe, Germany
    2. Center for Functional Nanostructures (CFN), KIT, Wolfgang-Gaede-Str. 1a, 76131 Karlsruhe, Germany
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  • Erich Müller,

    1. Center for Functional Nanostructures (CFN), KIT, Wolfgang-Gaede-Str. 1a, 76131 Karlsruhe, Germany
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  • Jens Czolk,

    1. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraβe 13, 76131 Karlsruhe, Germany
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  • Manuel Reinhard,

    1. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraβe 13, 76131 Karlsruhe, Germany
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  • Sebastian Valouch,

    1. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraβe 13, 76131 Karlsruhe, Germany
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  • Uli Lemmer,

    1. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraβe 13, 76131 Karlsruhe, Germany
    2. Center for Functional Nanostructures (CFN), KIT, Wolfgang-Gaede-Str. 1a, 76131 Karlsruhe, Germany
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  • Alexander Colsmann,

    1. Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT), Engesserstraβe 13, 76131 Karlsruhe, Germany
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  • Dagmar Gerthsen

    1. Laboratory for Electron Microscopy (LEM), KIT, Engesserstraβe 7, 76131 Karlsruhe, Germany
    2. Center for Functional Nanostructures (CFN), KIT, Wolfgang-Gaede-Str. 1a, 76131 Karlsruhe, Germany
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Abstract

The conjugated polymer poly(3-hexylselenophene-2,5-diyl) (P3HS) is a promising donor material for organic solar cells as its absorption covers a large part of the visible spectrum up to 730 nm. We investigate bulk heterojunctions of P3HS and the fullerene derivative [6,6]-phenyl C61-butyric acid methyl ester as the active layer in organic photovoltaic devices. Annealing of the respective samples leads to the formation of needle-like structures that we identify as P3HS whiskers by means of low-energy scanning transmission electron microscopy using a high-angle annular dark-field detector. A quantitative description of the size of the nanostructures was elaborated by means of spatial Fourier analyses. The results of electron microscopic studies are correlated with the macroscopic optoelectronic device properties, that is, solar cell performance parameters, with changes in the absorption spectrum and with the impact on the time-dependent device photoresponse. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

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