Electronic structure of long-range ordered pentacene structures on the stepped Cu(119) surface

The formation of long-range ordered molecular structures can be achieved by depositing pentacene molecules (C22H14) in ultra-high-vacuum (UHV) conditions on copper vicinal surfaces. The growth morphology of pentacene on the Cu(119) surface and the induced electronic states have been singled out and compared with the corresponding flat Cu(001) surface. Low energy electron diffraction (LEED) reveals the presence of a single domain long-range ordered phase for pentacene grown on Cu(119), and multi-phase domains when deposited on Cu(001). We identify similar hybrid molecule/substrate electronic states for both systems and we follow the molecular orbitals evolution as a function of pentacene deposition, by means of high-energy-resolution UV photoclectron spectroscopy (HR-UPS). The electronic spectral density evolution indicates the dominance of pentacene n extended orbitals interaction with the copper d bands for both systems. (C) 2004 Elsevier B.V. All rights reserved.