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Large surface relaxation in the organic semiconductor tetracene

Author

Listed:
  • Hazuki Morisaki

    (Graduate School of Engineering Science, Osaka University)

  • Takashi Koretsune

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Chisa Hotta

    (Graduate School of Arts and Science, University of Tokyo)

  • Jun Takeya

    (Graduate School of Frontier Sciences, University Tokyo)

  • Tsuyoshi Kimura

    (Graduate School of Engineering Science, Osaka University)

  • Yusuke Wakabayashi

    (Graduate School of Engineering Science, Osaka University)

Abstract

Organic crystals are likely to have a large degree of structural relaxation near their surfaces because of the weak inter-molecular interactions. The design of organic field-effect transistors requires a detailed knowledge of the surface relaxation as the carriers usually transfer within the first few molecular layers at the semiconductor surfaces, and their transport properties reflect the structural changes through the transfer integral. Here, we report the direct observation of the surface relaxation of an organic semiconductor, a tetracene single crystal, by means of X-ray crystal truncation rod scattering measurements. A significant degree of surface relaxation is observed, taking place only in the first monolayer at the semiconductor surface. First principles calculations show that the resultant transfer integrals are completely different between the bulk and surface of the semiconductor.

Suggested Citation

  • Hazuki Morisaki & Takashi Koretsune & Chisa Hotta & Jun Takeya & Tsuyoshi Kimura & Yusuke Wakabayashi, 2014. "Large surface relaxation in the organic semiconductor tetracene," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6400
    DOI: 10.1038/ncomms6400
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