Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Molecular Electronics and Excited State Properties

CPP 39.2: Vortrag

Donnerstag, 8. September 2022, 11:45–12:00, H38

Time-resolved spectroscopy study of the dynamics of charge transfer processes in strongly interacting organic donor/acceptor compounds — •Nico Hofeditz¹, Christoph P. Theurer², Julian Hausch², Katharina Broch², Wolfram Heimbrodt¹, and Marina Gerhard¹ — ¹Department of Physics, Philipps-Universität Marburg, Germany — ²Institut für Angewandte Physik, Universität Tübingen, Germany

Doping of organic semiconductors with strong acceptor molecules is an effective way to tailor their electronic properties. Here, we investigate the photoexcitation dynamics of blends of tetracene and the strong acceptor F4-TCNQ to better understand how acceptors alter the transport of charge carriers and excitons. The mixtures feature a phase of relatively pure tetracene as well as an intimately mixed phase. In the mixed phase donor and acceptor molecules for charge transfer complexes that efficiently quench excitons from the pure phases. That leads to faster photoluminescence dynamics in the blends with respect to neat tetracene. We investigate the low temperature photoluminescence through global analysis and find constrained dynamics in the blends which we attribute to localization effects and energetic disorder in the tetracene domains.