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Thin films of polyacene molecules have become widely used as molecular semiconducting materials in the field of organic electronics. Their transport properties in well-ordered organic thin films is highly anisotropic and a detailed understanding of the optical and electronic properties of their molecular crystals and their interfaces with metals implies the knowledge of their electronic structure[1,2,3].
Here we present a combined Photoemission, metastable deexcitation, Inverse Photoemission and XAS study of molecular states of polyacenes grown on noble metals, mainly Ag(111) and Au(111), from submonolayer to multilayer thicknesses.
The picture on the electronic occupied and unoccupied states and the molecular geometry in the bond derived from the composition of the different spectroscopies will be presented.
The molecular absorption differences related to molecular structure and its effects on the orientation and electronic properties in the various systems will be discussed.
[1] K.H. Frank, P. Yannoulis, R. Dudde, E.E. Koch, J. Chem Physics 89, 7569 (1988).
[2] G.Witte and C.Wöll, J. Mater. Res.19, 1889 (2004) and references therein.
[3] M. Pedio, B. P. Doyle, N. Mahne, A. Giglia, F. Borgatti, S. Nannarone, S.K. M. Henze, R. Temirov, S. Tautz , L. Casalis, R. Hudej, M.F. Danisman, B. Nickel, Appl. Surf. Sci. xx, xxxx (2007).
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