Upcoming Events
David Beljonne , Belgian National Science Foundation (FNRS)
Modelling electronic and excitonic processes in organic semiconductors
07.05.2019 (Tuesday)
, 16:40 - 18:10
Recknagel-Bau (REC) Hörsaal C213 , Haeckelstr. 3 , 01062 Dresden
Everybody welcome!
Abstract:
Energetics of charge carriers in organic semiconductors: Implications for optoelectronics’
A proper description of how semiconducting optoelectronic devices work starts with a
quantitative assessment of the energy landscape explored by positive and negative charge
carriers. In organics, this is controlled by the chemical nature of the molecular building
blocks, but also by the way these organize into the solid state, which namely defines their
classical electrostatic embedding and quantum-mechanical interactions. In addition,
conjugated organic materials are ‘soft’ and coupling between their electronic and vibrational
degrees of freedom is ubiquitous. In this presentation, we will first present a comprehensive
review of the fundamentals of charged excitations in organic conjugated semiconductors
based on a multifaceted modelling scheme combining a simple classical molecular dynamics
micro-electrostatic scheme to a state-of-the-art perturbative many-body quantum approach.
We will show applications of this computational machinery to ascertain the microscopic
mechanisms of doping, singlet fission and charge photogeneration in the bulk and at
interfaces between molecular materials.
Bio:
David Beljonne received his PhD in Chemistry with Professor Jean-Luc Brédas at the
University of Mons-Hainaut in 1994. After post-doctoral stays at the Universities of
Cambridge (with Professor Richard Friend) and Rochester (with Professor Shaul Mukamel),
he became a research fellow of the Belgian National Science Foundation (FNRS) and is now
FNRS Research Director. He is also a Visiting Principal Research Scientist at the Georgia
Institute of Technology in Atlanta and serves as an associate editor for ACS Applied Materials
& Interfaces. Co-author of about 400 scientific publications (more than 25000 citations; h
index of 81, Scopus), his research activities deal with a multifaceted modelling of the optoelectronic
processes taking place in the bulk and at interfaces of (semi)conducting organic,
2D and hybrid materials for electronics and energy applications.