Abstract
Real-time synchrotron x-ray scattering in the anti-Bragg configuration was used to monitor the dynamics of pentacene film growth on inert substrates. A distributed-growth model, according to which pentacene molecules adsorbed on the layer can either nucleate and contribute to the growth of the layer or transfer downward and contribute to the growth of the layer, gave a good description of the data. For molecules adsorbed on the first and second layers, the probability of downward transfer was found to be dependent on the substrate, and independent of temperature within the range from . For films grown on , an Ehrlich-Schwoebel barrier of the order of dominated downward transfer of pentacene molecules in layers away from the substrate. For films grown on an alkylated self-assembled monolayer, significant desorption of pentacene molecules from the substrate at elevated temperatures forced the growth mode toward the three-dimensional limit.
- Received 28 March 2006
DOI:https://doi.org/10.1103/PhysRevB.73.205307
©2006 American Physical Society