Strong modification of the transport level alignment in organic materials after optical excitation.

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 0.4 eV) of the non-excited molecules. As all observed dynamics evolve on identical timescales, we conclude that optical and transport properties are completely interlinked. This

SUBMITTER: Stadtmuller B 

PROVIDER: S-EPMC6443800 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature