Berlin 2018 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Organic photovoltaics and electronics
HL 45.3: Talk
Thursday, March 15, 2018, 15:30–15:45, EW 203
Surface-tension driven assembly of a novel perylene diimide derivative leads to highly crystalline monolayers — Ilja Vladimirov1,2, Matthias Kellermeier1, Thomas Geßner1, Zahra Molla3, Souren Grigorian3, Ullrich Pietsch3, Lilian Schaffroth4, Michael Kühn1, Falk May1, and •R. Thomas Weitz1,2,4 — 1BASF SE Ludwigshafen — 2InnovationLab GmbH Heidelberg — 3Fakultät für Physik, Universität Siegen — 4Physics of Nanosystems, NIM and CeNS, LMU Munich
The charge carrier mobility in thin films composed of organic semiconductors benefits from high crystalline order. An everlasting challenge with organic semiconductors when processed from solution is, that currently there is no general understanding of how to select solvents to yield a certain crystal morphology of the organic semiconductor. One approach is the crystallization of organic semiconductors at the liquid-air boundary of a drying droplet [1,2]. The systematics of why the used small molecules assemble preferably at the liquid-air interface have not been the focus of these studies. Here we show using a novel perylene diimide derivative that it is mainly the surface tension of a liquid, that drives the crystallization at the liquid-air interface of a drying droplet [3]. This confinement allows the growth of mm sized, few-nm thin crystals. We show that such crystals have excellent electrical performance. For example, electron field-effect mobilities of larger than 4 cm*/Vs were realized in only 3 nm thin films. [1] G. Giri et al. Nature Commun. 2014, 5, 3573 [2] H. Minemawari et al. Nature 2011, 475, 364 [3] I. Vladimirov et al. Nano Lett. 10.1021/acs.nanolett.7b03789