Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 3: Organic Thin Films

DS 3.3: Vortrag

Montag, 16. März 2015, 15:45–16:00, H 2032

Influencing the growth of para-sexiphenyl through chemical tuning — •Anton Zykov¹, Mino Sparenberg¹, Paul Beyer¹, Linus Pithan¹, Christopher Weber¹, Yves Garmshausen², Francesco Carlà³, Stefan Hecht², Sylke Blumstengel¹, Fritz Henneberger¹, and Stefan Kowarik¹ — ¹Inst. f. Physik, Humboldt-Universität zu Berlin — ²Inst. f. Chemie, Humboldt-Universität zu Berlin — ³ESRF, Grenoble

We investigate the molecular growth of hybrid organic-inorganic semiconductor systems (HIOS) and show that chemical tuning can be used to optimize the growth mode [1]. We employ fluorination of para-sexiphenyl (6P) to drastically alter the growth mode from a rough three-dimensional towards a smooth, crystalline layer-by-layer growth as demanded for efficient opto-electronic devices with advanced properties. Our study combines in situ atomic force microscopy and in situ real-time X-ray scattering performed at the ID03 beamline at ESRF to monitor the evolution of the molecular thin film structure and morphology on non-polar ZnO (1010) substrates. In contrast to the parent molecule 6P, we observe for the fluorinated 6P a suppression of the growth of a second crystal phase and an increased molecular diffusivity together with a lower Ehrlich-Schwoebel barrier. As a consequence the interlayer mass transport is increased, which leads to the observed improvement in growth-mode.
M. Sparenberg*, A. Zykov*, P. Beyer, L. Pithan, C. Weber, Y. Garmshausen, F. Carlà, S. Hecht, S. Blumstengel, F. Henneberger and S. Kowarik. Phys. Chem. Chem. Phys., 2014, 16, 26084-26093.