CUED Publications database

Coverage dependent adsorption dynamics in hyperthermal organic thin film growth.

Amassian, A and Desai, TV and Kowarik, S and Hong, S and Woll, AR and Malliaras, GG and Schreiber, F and Engstrom, JR (2009) Coverage dependent adsorption dynamics in hyperthermal organic thin film growth. J Chem Phys, 130. 124701-.

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Abstract

We have examined the dynamics of adsorption of diindenoperylene (DIP) on SiO(2) and SiO(2) 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.

Item Type: Article
Uncontrolled Keywords: Adsorption Indenes Kinetics Perylene Probability Silicon Dioxide Temperature X-Ray Diffraction
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 10 Sep 2017 20:11
Last Modified: 18 Nov 2017 21:47
DOI: