Abstract
Various coverages of benz[a]anthracene (BA) thin films prepared by depositing the molecules in several steps on Au(111) and Ag(111) were investigated using ultraviolet and X-ray photoelectron spectroscopy (UPS and XPS). XPS and UPS were taken after each deposition. A Schottky junction formed between BA/Au(111) and BA/Ag(111). A hole barrier height of 1.89 eV in BA/Ag(111) was determined directly from the observed highly occupied molecular orbital (HOMO) peak cutoff however a HOMO peak cutoff in BA/Au(111) 1.63 eV was indirectly determined. When combined with previous measurements of the BA/Cu(111) interface, the slope S of the plot of hole barrier height as a function of metal workfunction (WF) was calculated to be 0.39, which is close to the S value of pentacene. Discussion on film growth mode, band bending, band diagram, and comparisons of interface parameter S of BA with S of other molecules condensed on metal surfaces are presented.
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