Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 26: Organic Electronics and Photovoltaics 2
CPP 26.5: Talk
Wednesday, September 7, 2022, 12:30–12:45, H38
Thin films of electron donor-acceptor complexes: characterisation of mixed-crystalline phases and implications for electrical doping — •Andreas Opitz1, Giuliano Duva2, Marius Gebhardt3, Hongwon Kim3, Eduard Meister3, Tino Meisel1, Paul Beyer1, Valentina Belova2, Christian Kasper4, Jens Pflaum4, Linus Pithan4,5, Alexander Hinderhofer2, Frank Schreiber2, and Wolfgang Brütting3 — 1Institut für Physik, Humboldt-Universität zu Berlin, Germany — 2Institut für Angewandte Physik, Universität Tübingen, Germany — 3Institut für Physik, Universität Augsburg, Germany — 4Experimentelle Physik VI, Julius-Maximilians-Universität Würzburg, Germany — 5European Synchrotron Radiation Facility, Grenoble Cedex 9, France
Electron donor-acceptor (EDA) complexes are of interest as low-band gap molecular semiconductors and as dopants for molecular semiconducting matrices. Our recent work establishes a link between optical, structural and vibrational properties of EDA complexes as well as the electrical doping by them. [1] Here, we report on optical and electrical properties of EDA complexes. All studied donor:acceptor systems form mixed crystalline structures and the EDA complex is characterised by the complex-related absorption, which cross the neutral-to-ionic boundary. Our measurements reveal an exponential relation between electrical conductivity and activation energy of transport for all complex-doped systems related to the separation of Coulombically bound charges.
[1] A. Opitz et al., Mater. Adv. 3 (2022). DOI: 10.1039/D1MA00578B