Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.69: Poster

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

Growth Kinetics-Controlled Morphology of DNTT Thin Films on KCl (001) — •Darius Günder, Andrea Huttner, Tobias Breuer, and Gregor Witte — FB Physik, Philipps-Universität Marburg

The novel organic semiconductor dinaphthothienothiophene (DNTT) has recently gained interest for molecular electronic devices due to its high charge carrier mobility [1]. While the main focus here is typically on transistor characteristics, the microstructure and morphology of the organic semiconductor films are usually less well known. In previous work, a substrate mediated control of the molecular orientation as well as notable dewetting was observed for DNTT [2]. In the present study, we report on the coexistence of two different film morphologies on KCl (001) substrates. Using atomic force microscopy (AFM) we show that by variation of the kinetic growth parameters such as substrate temperature and evaporation rate the amount of both structures can be precisely tuned. Complementary X-Ray diffraction (XRD) measurements reveal different molecular orientations in these two morphologies. Interestingly, both structures grow epitaxially on the KCl (001) surfaces in different discrete azimuthal orientations as observed from statistical analysis of AFM data and inplane XRD scans.

[1] Xie et al., Advanced Materials 25, 3478 (2013)

[2] Breuer et al., ACS Applied Materials & Interfaces 9, 8384 (2017)