Affiliation:
1. Department of Physical Chemistry Fritz Haber Institute of the Max Planck Society Faradayweg 4-6 14195 Berlin Germany
2. Max Planck Institute for the Structure and Dynamics of Matter Luruper Chaussee 149 22761 Hamburg Germany
3. Institut für Optik und Atomare Physik Technical University Berlin Strase des 17. Juni 135 10623 Berlin Germany
4. Department of Physics Freie Universität Berlin Arnimallee 14 14 195 Berlin Germany
Abstract
Singlet exciton fission (SF), the formation of two triplet excitons from one singlet exciton, involves electronic, nuclear, and spin degrees of freedom as well as their couplings. Despite almost 60 years of research on this process, a complete microscopic understanding is still missing. One important open question concerns the role of nuclear motion in SF. In this perspective, recent results on the exciton dynamics are related to the structural dynamics of single‐crystal pentacene and how they provide insights into that open question is shown. To probe the electronic dynamics, orbital‐resolved measurements of the electronic structure are carried out using time‐ and angle‐resolved photoemission spectroscopy. With femtosecond electron diffraction and with ab initio computations, the complementary nuclear dynamics is tracked. The results from both techniques are summarized, and how they relate to each other is discussed. Then, remaining open questions are outlined and potential routes are identified to tackle them, hopefully guiding future studies.
Funder
Deutsche Forschungsgemeinschaft
HORIZON EUROPE European Research Council
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Subject
Materials Chemistry,Electrical and Electronic Engineering,Surfaces, Coatings and Films,Surfaces and Interfaces,Condensed Matter Physics,Electronic, Optical and Magnetic Materials