NW: Charge separation at nanostructured molecular donor-acceptor interfaces


Organic donor and acceptor molecules represent an important class of materials for solar energy conversion. The focus of this project is to combine the complementary expertise of four groups to address central issues for photovoltaic cells based on these materials. These are: film structure and morphology, electronic structure at interfaces, excitonic processes and charge transport. The goal of this concerted approach is to develop a detailed understanding of the correlation between structural and electronic properties both in the film and at interfaces, microscopic transport phenomena and macroscopic parameters determining solar cell performance for different prototypes of donor/acceptor pairs. This knowledge should enable growing films with favourable properties for exciton and charge transport in both the donor and acceptor phase and efficient charge separation and extraction at the involved interfaces. Starting from a simple planar heterojunction we will proceed to more complex structures, including interdigitated organic/organic interfaces and bulk-heterojunctions to achieve this goal.


Principal Investigators
Koch, Norbert Prof. Dr. techn. (Details) (Junior Research Group 'Lattice QCD with 2+1+1 flavors of dynamical quarks: simulation and analysis aspects' (DFG))

Duration of Project
Start date: 03/2008
End date: 12/2010

Research Areas
Experimental Condensed Matter Physics

Research Areas
Experimentelle Physik, kondensierte Materie

Publications
S. Duhm, I. Salzmann, G. Heimel, M. Oehzelt, A. Haase, R. L. Johnson, J. P. Rabe, N. Koch
Controlling energy level offsets in organic/organic heterostructures using intramolecular polar bonds
Appl. Phys. Lett. 94 (2009) 033304. DOI: 10.1063/1.3073046

S. Duhm, I. Salzmann, R. L. Johnson, N. Koch
Electronic non-equilibrium conditions at C60-pentacene heterostructures
Journal of Electron Spectroscopy and Related Phenomena 174 (2009) 40. DOI: 10.1016/j.elspec.2009.04.008

I. Salzmann, S. Duhm, R. Opitz, R. L. Johnson, J. P. Rabe, N. Koch
Structural and electronic properties of pentacene-fullerene heterojunctions
Journal of Applied Physics 104 (2008) 114518. DOI: 10.1063/1.3040003

Last updated on 2020-09-03 at 17:13