Authors: Stadtmüller, Benjamin
Emmerich, Sebastian
Jungkenn, Dominik
Haag, Norman
Rollinger, Markus
Eich, Steffen
Manira, Mahalingam
Aeschlimann, Martin
Cinchetti, Mirko
Mathias, Stefan
Title: Strong modification of the transport level alignment in organic materials after optical excitation
Language (ISO): en
Abstract: Organic photovoltaic devices operate by absorbing light and generating current. These two processes are governed by the optical and transport properties of the organic semiconductor. Despite their common microscopic origin—the electronic structure—disclosing their dynamical interplay is far from trivial. Here we address this issue by time-resolved photoemission to directly investigate the correlation between the optical and transport response in organic materials. We reveal that optical generation of non-interacting excitons in a fullerene film results in a substantial redistribution of all transport levels (within 0.4eV) of the non-excited molecules. As all observed dynamics evolve on identical timescales, we conclude that optical and transport properties are completely interlinked. This finding paves the way for developing novel concepts for transport level engineering on ultrafast time scales that could lead to novel functional optoelectronic devices.
Subject Headings: Carbon nanotubes and fullerenes
Surfaces, interfaces and thin films
Issue Date: 2019-04-01
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