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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster Session II

CPP 49.4: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1A

Structure Formation and Optical Emission of Organic Binary Mixed Thin Films — •Oleg Vladimirov, Nadine Rußegger, Alexander Hinderhofer, and Frank Schreiber — Institut für Angewandte Physik, Universität Tübingen, Tübingen 72076, Germany

We present a comprehensive investigation of the charge transfer (CT) effect in weakly interacting organic semiconductors by means of planar heterostructures and mixtures. The donor-acceptor pairs diindenoperylene (DIP) with N,N*-Dimethyl-3,4,9,10-perylenetetracarboxylic diimide (PTCDI-C1), 2,9-Dipropylanthra[2,1,9-def:6,5,10-d*e*f*]diisoquinoline-1,3,8,10(2H,9H)tetrone (PTCDI-C3) and N,N*-Dipentyl-3,4,9,10-perylenedicarboximide (PTCDI-C5) have been chosen for this purpose in order to investigate the structure and CT characteristics in dependence of the chain length of the respective molecules. The binary mixtures of PTCDI derivatives have already been studied for different mixing ratios in reference [V.Belova J. Am. Chem. Soc. 2017, 139, 25, 8474-8486]. A wide range of experimental methods, for instance atomic force microscopy, x-ray reflectometry, photoluminescense spectroscopy, UV-Vis spectroscopy and ellipsometry were used in order to characterize the structural, optical, electronic, and device properties of the intermolecular interactions. We observed that the mixtures with PTCDI-C1 phase separate due to their short chain length and form crystal structures when grown at high temperature, whereas mixtures with PTCDI-C3 show the formation of a co-crystal with pronounced CT.