Abstract
Various coverages of perylene thin films on Ag(111) and Cu(111) were investigated using ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS) and near monolayer (ML) films by scanning tunneling microscopy (STM). A Schottky junction is formed between perylene/Ag(111) and perylene/Cu(111) with hole barrier heights of 1.30 and 1.10 eV, respectively. When combined with previous measurements of the perylene/Au(111) interface, the slope S, in the plot of the hole barrier height as a function of work function, was calculated to be 0.53, which is higher than the S value for the other planar polyaromatic hydrocarbons without heteroatoms, revealing that the slope is material specific. During deposition a wetting layer of approximately 4 A thickness was initially formed followed by island formation, consistent with Stranski−Krastanov (SK) growth. Room temperature STM investigations of nominal one ML perylene films revealed coincidence-II and double row array structures with commensurate lattices on Ag(111) ...
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