Journal
SURFACE SCIENCE
Volume 532, Issue -, Pages 249-254Publisher
ELSEVIER
DOI: 10.1016/S0039-6028(03)00167-5
Keywords
photoelectron spectroscopy; atomic force microscopy; low energy electron diffraction (LEED); growth; interface states; self-assembly; surface structure, morphology, roughness, and topography
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High-quality ordered growth and characterization of organic systems is an important requirement to understand the physical properties underlying the new organic-molecule based electronic devices. In this work, pentacene (C22H14) is ultra-high-vacuum deposited in situ on the (1 x 2)-reconstructed surface of Au(110), at different substrate temperatures. Low-energy electron diffraction reveals a two-dimensional (2D) ordered phase, showing the presence of a (1 x 3) pentacene-induced long-range periodicity, for room-temperature deposition. High-resolution UV photoelectron spectroscopy investigations for pentacene adsorption at room- and low- (80 K) temperature, bring to light the new interface electronic levels and the molecular orbital evolution. Higher substrate temperature (370 K) during adsorption induces higher pentacene mobility, thus improving long-range ordering. Atomic force microscopy images at higher coverage show the presence of pentacene stripes, grown on top of the first 2D ordered layer, with a preferred orientation perpendicular to the substrate [1-10] direction. (C) 2003 Elsevier Science B.V. All rights reserved.
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