Dr. Stefan Kraner


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.

PhD in Physics, Technical University Dresden, Supervisor: Prof. Leo.

Topic: Improved organic materials and electronic properties of organic solar cells

Postdoc, Dresden Center for Comput. Materials Science, Prof. Cuniberti

Topic: Investigation of the exciton binding energy of molecular triads by MD and DFT calculations

Engineer in Processintegration, responsible for the lifetime of organic solar cell, Heliatek GmbH

Postdoc, University Konstanz, Prof. Schmidt-Mende