Mechanism of two-dimensional chiral growth of 6,13-pentacenequinone thin films on Si(1 1 1)

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

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Thin film growth of 6,13-pentacenequinone (C24H12O2, PnQ) on Si(1 1 1)-7 × 7 at room temperature (RT) was studied by low-energy electron microscopy (LEEM) and ab initio density functional theory (DFT) calculations. Our experiments yielded direct microscopic observation of enantiomorphic evolution mechanism in the initial stage of the chiral-like growth of PnQ islands, under kinetic growth conditions. We observed that the faster growth direction aligns with the direction of easier molecule incorporation, or lowest kink formation energy, rather than along the lowest energy step. Real time observation of the growth and subsequent relaxation of island shape revealed that kinetically stiff direction differs from the thermodynamic one. This feature together with anisotropic mass incorporation determines the enantiomorphic evolution and rotational arrangement of crystallites during the growth of elongated organic molecules, like PnQ.

Original languageEnglish
Pages (from-to)1311-1318
Number of pages8
JournalSurface Science
Volume601
Issue number5
DOIs
Publication statusPublished - 2007 Mar 1
Externally publishedYes

Keywords

  • Kinetic growth
  • Low-energy electron diffraction
  • Low-energy electron microscopy
  • Organic thin films
  • Surface chirality

ASJC Scopus subject areas

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

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