Prof.
Christian Teichert
(Institute of Physics, Montanuniversität Leoben, Austria)
Crystalline films of small semiconducting organic molecules on two-dimensional materials like graphene or ultrathin hexagonal boron nitride (hBN) offer attractive potential for fabricating organic solar cells, organic light emitting diodes, and organic field effect transistors on flexible substrates. Here, we report on the growth of the polar, acene-like molecule dihydrotetraazaheptacene (DHTA7) on hBN. µm-long crystalline needles are observed which are oriented close to armchair directions of the substrates with a 9° deviation which originates from the dipolar interaction of the molecules as demonstrated by DFT calculations. Results are compared to needle growth of the nonpolar parahexaphenyl molecule 6P on hBN [1].
[1] Matković, et al., Sci. Rep. 6, 38519 (2016).
Prof.
Christian Teichert
(Institute of Physics, Montanuniversität Leoben, Austria)
Mr
Jakob Genser
(Institute of Physics, Montanuniversität Leoben, Austria)
Dr
Aleksandar Matković
(Institute of Physics, Montanuniversität Leoben, Austria)
Dr
Markus Kratzer
(Institute of Physics, Montanuniversität Leoben, Austria)
Prof.
Radoš Gajić
(Institute of Physics, University of Belgrade, Belgrade, Serbia)
Dr
Zhongrui Chen
(CINaM, Aix Marseille Université, CNRS, Marseille, France)
Prof.
Olivier Siri
(CINaM, Aix Marseille Université, CNRS, Marseille, France)
Prof.
Conrad Becker
(CINaM, Aix Marseille Université, CNRS, Marseille, France)
Dr
Daniel Lüftner
(Institute of Physics, Karl-Franzens-Universität Graz, Graz, Austria)
Prof.
Peter Puschnig
(Institute of Physics, Karl-Franzens-Universitaet Graz, Graz, Austria)
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