Dr. Stefan Kraner
Postdoc
E-Mail: stefan.kraner@...
Phone: 4926
Room: P920
Research Interests
Tailoring amphiphilic organic molecules for self assembled photovoltaic materials
Organic photovoltaics represent a cost-effective, renewable and therefore future-oriented energy supply. However, the power conversion efficiencies of this technology are still too low for the large-scale use of organic photovoltaics. The reason for the low efficiency can be attributed to the high voltage losses caused by the required donor-acceptor system and the low charge carrier mobility in the photoactive material.
In the current project, a concept is being tested which provides an ideal morphology for organic solar cells. The core of the concept consists in the self-assembly of amphiphilic organic donor acceptor molecules into a phase-separated bilayer, leading to donor and acceptor phases with a crystalline structure which improves the charge carrier mobility by order of magnitudes. In addition, the donor-acceptor interface is defined intramolecularly via a spacer molecule, thus enabling the donor-acceptor interface to be optimized at the molecular level. This ideal morphology presumably leads to very high power conversion efficiencies.
Curriculum vitae
2011 :
Master in Micro- & Nanotechnology, Johannes Kepler University, Supervisor: Prof. Sariciftci.
Topic: Measurement of charge carrier mobility and charge carrier concentration of organic photovoltaic diodes under in situ light soaking conditions and varying temperatures.
2012-2015:
PhD in Physics, Technical University Dresden, Supervisor: Prof. Leo.
Topic: Improved organic materials and electronic properties of organic solar cells
2016-2017
Postdoc, Dresden Center for Comput. Materials Science, Prof. Cuniberti
Topic: Investigation of the exciton binding energy of molecular triads by MD and DFT calculations
2018-2019:
Engineer in Processintegration, responsible for the lifetime of organic solar cell, Heliatek GmbH
2019-now:
Postdoc, University Konstanz, Prof. Schmidt-Mende