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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 Brütting31Institut 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

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