Epitaxial structures of self-organized, standing-up pentacene thin films studied by LEEM and STM

A. Al-Mahboob, J. T. Sadowski, T. Nishihara, Y. Fujikawa, Q. K. Xue, K. Nakajima, Toshio Sakurai

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    Growth of pentacene (Pn) thin films has been studied in situ by means of low-energy electron microscopy (LEEM) and scanning tunneling microscopy (STM). A very low nucleation density of Pn grains has been observed on Bi(0 0 0 1)/Si(1 1 1) template, resulting in formation of large, monolayer-high Pn grains with diameter exceeding several hundreds of micrometers. We determined that formation of self-organized, standing-up Pn epitaxial layers was stabilized by a weak interaction between the substrate and Pn molecules and by the presence of the commensurate structure between the oblique Pn lattice and trigonal substrate surface lattice. The 'point-on-line' commensurability has been found along a-axis of Pn and one of the primitive vectors of substrate surface lattice. Strong 'point-on-line' commensurability in Pn/Bi(0 0 0 1)/Si(1 1 1) system resulted in a bulk-like epitaxial thin film growth, starting from the first layer. The presence of twins, often having a mirror line parallel to the direction of the 'point-on-line' matching, has been also detected using an asymmetric dark-field imaging mode in LEEM experiments, which, we believe, is the first LEEM demonstration of molecular tilt imaging.

    Original languageEnglish
    Pages (from-to)1304-1310
    Number of pages7
    JournalSurface Science
    Volume601
    Issue number5
    DOIs
    Publication statusPublished - 2007 Mar 1

    Keywords

    • Epitaxy
    • Low-energy electron diffraction (LEED)
    • Low-energy electron microscopy (LEEM)
    • Pentacene
    • Scanning tunneling microscopy
    • Self-assembly

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

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  • Cite this

    Al-Mahboob, A., Sadowski, J. T., Nishihara, T., Fujikawa, Y., Xue, Q. K., Nakajima, K., & Sakurai, T. (2007). Epitaxial structures of self-organized, standing-up pentacene thin films studied by LEEM and STM. Surface Science, 601(5), 1304-1310. https://doi.org/10.1016/j.susc.2006.12.064