Structural transition of pentacene monolayer on Ga bilayer: From brick-wall structure to herringbone pattern of molecular dimers

Jun Zhong Wang, Ke Hui Wu, Wei Sheng Yang, Xing Jun Wang, J. T. Sadowski, Y. Fujikawa, T. Sakurai

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Utilizing the substrate of Ga bilayer grown on Si(1 1 1)-√3 × √3-Ga, we have investigated the structural transition of pentacene monolayer induced by moderate annealing. Short-range ordering has been observed in the monolayer pentacene deposited at room temperature. Annealing the sample at ∼350 K produced ordered pentacene monolayer with the "brick- wall" adsorption pattern. The STM images with sub-molecular resolution revealed that the orbital symmetry of the HOMO is reduced from D2h to C2v, due to the substrate-molecule interaction, while the deeper HOMO-1 orbital remains intact. Further annealing at ∼400 K led to the formation of molecular dimers as well as the structural transition from "brick-wall" packing to "herringbone" pattern.

    Original languageEnglish
    Pages (from-to)80-88
    Number of pages9
    JournalSurface Science
    Volume579
    Issue number1
    DOIs
    Publication statusPublished - 2005 Mar 20

    Keywords

    • Gallium bilayer
    • Molecule-solid reaction
    • Pentacene
    • Scanning tunneling microscopy
    • Surface structure

    ASJC Scopus subject areas

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

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