Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.66: Poster

Tuesday, March 13, 2018, 18:15–20:15, Poster B

Initial Growth of DNTT Thin Films on Ag(111) — •Daniel Bischof, Maximilian Dreher, Andrea Huttner, Felix Widdascheck, Tobias Breuer, and Gregor Witte — FB Physik Phillips-Universität Marburg 35032 Marburg, Germany

The high charge carrier mobility of the novel organic semiconductor (OSC) dinaphthothienothiophene (DNTT) has created large interest in this compound in view of potential efficient devices. Since device characteristics are largely governed by interfaces to metallic electrodes, the structure and coupling at metal surfaces is of fundamental interest. Here, we combined STM and NEXAFS to investigate the initial stage of DNTT film growth on Ag(111) substrates. While initially a relaxed monolayer of flat-lying molecules is formed, at large coverage a compressed monolayer forms, where molecules exhibit a herringbone arrangement. Interestingly, multilayer films reveal a temporal dewetting, yielding the formation of discrete islands surrounded by regions with the relaxed monolayer.