Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 39: Poster Session II
DS 39.7: Poster
Thursday, March 19, 2015, 16:00–18:30, Poster F
CHARGE TRANSFER IN ORGANIC MIXED FILMS OF DIINDENOPERYLENE AND PDIR-CN2 — •Valentina Belova1, Giuliano Duva1, Paul Beyer2, Alexander Hinderhofer1, Alexander Gerlach1, Frank Schreiber1, and Andreas Opitz2 — 1Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany — 2Department of Physics, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 6, 12489 Berlin, Germany
Interface doping by molecular charge transfer is a promising approach to tune the electronic properties of organic semiconductors without changing their molecular arrangement [1]. DIP (diindenoperylene) was chosen as a prototypical donor with good charge transport properties and optical contrast [2]. Since DIP (C32H14) possesses relatively high ionization energy (5.35 eV) it requires strong acceptor like PDIR-CN2 (CxHyO4N4) with electron affinity 4.3 eV. We studied thin blended (co-evaporated) films by structural and optical methods in order to investigate charge transfer effect between the HOMO of DIP and the LUMO of PDIR-CN2. Optical studies involved FTIR spectroscopy, spectroscopic ellipsometry, UV-VIS absorption, as well as photoluminescence (temperature dependent) and Raman spectroscopy. Structural and morphological characterisation of the mixed films was carried out by X-ray diffraction and atomic force microscopy. Signatures of intermolecular interaction in DIP:PDIR-CN2 mixtures are discussed.
[1] A. Hinderhofer/F. Schreiber, ChemPhysChem, 13, 628 (2012) [2] J. Wagner et al., Adv. Funct. Mater. 20, 4295 (2010)