Observation and modeling of quasiepitaxial growth of a crystalline organic thin film

  • P. E. Burrows
    Department of Electrical Engineering/Electrophysics and Materials Science, University of Southern California, Los Angeles, California 90089-0241
  • Y. Zhang
    Department of Electrical Engineering/Electrophysics and Materials Science, University of Southern California, Los Angeles, California 90089-0241
  • E. I. Haskal
    Department of Electrical Engineering/Electrophysics and Materials Science, University of Southern California, Los Angeles, California 90089-0241
  • S. R. Forrest
    Department of Electrical Engineering/Electrophysics and Materials Science, University of Southern California, Los Angeles, California 90089-0241

書誌事項

公開日
1992-11-16
DOI
  • 10.1063/1.108183
公開者
AIP Publishing

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説明

<jats:p>We directly observe, using the scanning tunneling microscope, a two-dimensional crystal of the organic compound 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA). The surface unit cell dimension is found to be 21.6±2.2 Å by 15.2±1.6 Å, or approximately 20% larger than the bulk unit cell. Furthermore, the organic lattice is oriented with respect to the graphite substrate even though the two lattices are incommensurate. These observations are consistent with reflection high energy electron diffraction measurements, and energy minimization calculations, assuming that the van der Waals bond is the predominant intermolecular force which determines the equilibrium crystal structure. The combination of measurement and theory provides the first step in developing tools for predicting the conditions which lead to quasiepitaxial growth of these technologically important van der Waals solids.</jats:p>

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