Coverage dependent adsorption dynamics in hyperthermal organic thin film growth

Aram Amassian, T. V. Desai, S. Kowarik, S. Hong, A. R. Woll, G. G. Malliaras, F. Schreiber, J. R. Engstrom

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

We have examined the dynamics of adsorption of diindenoperylene (DIP) on SiO2 and SiO2 modified with an interfacial organic layer using in situ real time synchrotron x-ray scattering, focusing on the effects of coverage. On both surfaces we observe a substantial increase in the probability of adsorption with increasing coverage, which is most dramatic at the highest incident kinetic energies. On the initially uncovered surfaces, we observe a smooth decrease in the probability of adsorption with increasing incident kinetic energy, indicative of trapping-mediated adsorption. Once both surfaces are covered by DIP, the effects of incident kinetic energy are greatly reduced, and trapping is very efficient over the range of kinetic energies examined. Possible reasons for efficient trapping at high coverage and at high incident kinetic energy include more efficient momentum transfer due to mass matching, and possibly direct molecular insertion. Comparison to results on another small-molecule, pentacene, suggests that this behavior should be common to hyperthermal growth of a variety of other small-molecule thin films.

Original languageEnglish (US)
Article number124701
JournalJournal of Chemical Physics
Volume130
Issue number12
DOIs
StatePublished - Apr 8 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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