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Observation of Unusual Homoepitaxy in Ultrathin Pentacene Films and Correlation with Surface Electrostatic Potential

Authors

  • Vivek Kalihari,

    1. Department of Chemical Engineering and Materials Science University of Minnesota 151 Amundson Hall, 421 Washington Avenue SE Minneapolis, MN 55455 (USA)
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  • David J. Ellison,

    1. Department of Chemical Engineering and Materials Science University of Minnesota 151 Amundson Hall, 421 Washington Avenue SE Minneapolis, MN 55455 (USA)
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  • Greg Haugstad,

    1. Characterization Facility University of Minnesota Shepherd Labs, 100 Union St SE Minneapolis, MN 55455 (USA)
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  • C. Daniel Frisbie

    Corresponding author
    1. Department of Chemical Engineering and Materials Science University of Minnesota 151 Amundson Hall, 421 Washington Avenue SE Minneapolis, MN 55455 (USA)
    • Department of Chemical Engineering and Materials Science University of Minnesota 151 Amundson Hall, 421 Washington Avenue SE Minneapolis, MN 55455 (USA).
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Abstract

original image

Pentacene second layer grows with a twist (∼76 °) on the first layer, while the third and subsequent layers show commensurism with their respective underlayers. The preferred twisting of the second layer on the first layer gives rise to epitaxial and non-epitaxial domains which also reflect in the surface electrostatic potential measurements.

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