Berlin 2005 – scientific programme
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O: Oberflächenphysik
O 45: Organische Dünnschichten IV
O 45.7: Talk
Tuesday, March 8, 2005, 17:15–17:30, TU EB301
Tetracene and pentacene growth on Ag(111) — •Moritz Sokolowski1, Andreas Langner1, Annegret Hauschild1, Russlan Temirov2, Stefan Tautz2, Maxim Eremtchenko 3, D. Bauer3, and Jürgen-A. Schaefer3 — 1Institut für Physikalische und Theoretische Chemie der Universität Bonn — 2School of Engineering and Science, International University Bremen — 3Institut für Physik und Zentrum für Mikro- und Nanotechnologien, Technische Universität Ilmenau
The growth of the two polyacenes tetracene (Tc) and pentacene (Pc) on Ag(111) was investigated by SPA-LEED, STM, HREELS, XPS, and TPD. Although the two molecules are chemically similar, their growth behaviour on Ag(111) turns out to be significantly different. Tc forms two long-range ordered monolayer structures at temperatures below 230 K, which contain one (planar) and two (slighly tilted) Tc molecules per unit cell, respectively [1]. From the second layer onward, a pronounced cluster-growth occurs. Quite differently, the monolayer of Pc appears to be disordered, possibly due to kinetic limitations. Interestingly, the second layer exhibits a long range ordered structure, whereby the growth directions are templated by surface steps. Supported by the DFG. [1] A. Langner et al., Surf. Science (2004), in press.