The electronic states of ordered thin films of perylene on Ag (110)

The growth of perylene on Ag (110) has been studied by ultraviolet photoemission spectroscopy measurements and low-energy electron diffraction. Four emission features of the organic material are located at 3.5, 4.8, 6.4 and 8.5 eV, respectively, below the Fermi level. An ordered structure of c(6 x 2) can be observed when the organic film is about a monolayer (3Angstrom thickness). The angle-resolved ultraviolet photoemission spectroscopy measurements show that the molecular plane of perylene near the interface is parallel to the substrate. The desorption of the organic material occurs with warming the substrate; the perylene molecules are stable on the Ag (110) surface and no decomposition is observed below 140degreesC. (C) 2004 Elsevier B.V. All rights reserved.