Dynamics of charge transfer states in organic semiconductor devices: A combined experimental and simulation-based approach
Final Report Abstract
The aim of the project was to study the dynamics of charge transfer states (also denoted as CT excitons) in organic donor-acceptor systems and, specifically, the interplay between different excitonic species as well as between CT excitons and charge carriers, both in the bulk of individual layers (intra-molecular) and at interfaces of multilayer organic semiconductor devices (inter-molecular). This required the preparation of clean model systems to isolate the underlying processes by dedicated experiments on the one hand; on the other hand theoretical models needed to be extended to capture the enhanced complexity of these systems. The dynamics of CT states were studied in both organic LEDs and solar cell configurations. Specifically, the group at University of Augsburg focused on OLED-related phenomena, such as exciton-charge quenching and spontaneous orientation polarization, while the group at ZHAW Winterthur has performed work on simulation of both OLEDs and solar cells.
Publications
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Application of Fluorescent Molecules as Noninvasive Sensors for Optoelectronic Characterization on Nanometer Length Scales. ACS Applied Electronic Materials, 2(1), 186-194.
Ferschke, Thomas; Hofmann, Alexander; Brütting, Wolfgang & Pflaum, Jens
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The Many Facets of Molecular Orientation in Organic Optoelectronics. Advanced Optical Materials, 9(21).
Hofmann, Alexander; Schmid, Markus & Brütting, Wolfgang
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Controlling Charge Accumulation Properties of Organic Light‐Emitting Diodes using Dipolar Doping of Hole Transport Layers. Advanced Optical Materials, 10(21).
Noguchi, Yutaka; Hofmann, Alexander & Brütting, Wolfgang
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Detailed electro-optical modeling of thermally-activated delayed fluorescent OLEDs with different host-guest concentrations. Organic Electronics, 107, 106553.
Sem, S.; Jenatsch, S.; Sahay, P.; Züfle, S.; Schmid, M.; Brütting, W. & Ruhstaller, B.
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Controlling Spontaneous Orientation Polarization in Organic Semiconductors─The Case of Phosphine Oxides. ACS Applied Materials & Interfaces, 15(47), 54721-54731.
Cakaj, Albin; Schmid, Markus; Hofmann, Alexander & Brütting, Wolfgang
