SPP1355:Charge separation at nanostructured molecular donor-acceptor interfaces III


Organic donor and acceptor molecules represent an important class of materials for solar energy conversion.
The focus of this project is to combine the expertise of four experimental groups to address the correlation
between film and interface morphology and the photoelectrical properties of excitonic solar cells.
The goal of this multilateral approach is to develop a detailed understanding of the correlation between
structural and electronic properties, microscopic transport phenomena and macroscopic parameters determining
solar cell performance for different prototypes of donor and acceptor materials. In the first two
funding periods we have studied a variety of D/A combinations, both in planar heterojunctions as well as
in bulk-heterojunctions, in order to identify different growth behaviour and to estimate their potential in
OPV cells. In this final phase of the project we will now focus our efforts on selected, particularly promising
D/A pairs, e.g. those containing diindenoperylene as acceptor moiety, and develop a general understanding
of molecular solar cells by bringing together all the information obtained by our synergetic approach.
This also includes interfaces between organic layers and metal electrodes as well as environmental
effects and materials purity.

Principal Investigators
Koch, Norbert Prof. Dr. techn. (Details) (Structure, Dynamics and electronic Properties of Molecular Systems)

Duration of Project
Start date: 08/2012
End date: 06/2015

Research Areas
Experimental Condensed Matter Physics

Research Areas
Experimentelle Physik, kondensierte Materie

Publications
A. Opitz, A. Wilke, P. Amsalem, M. Oehzelt, R.-P. Blum, J.P. Rabe, T. Mizokuro, U. Hörmann, R. Hansson, E. Moons, N. Koch
Organic heterojunctions: Contact-induced molecular reorientation, interface states, and charge re-distribution
Scientific Reports 6 (2016) 21291. DOI: 10.1038/srep21291

U. Hörmann, C. Lorch, A. Hinderhofer, A. Gerlach, M. Gruber, J. Kraus, B. Sykora, S. Grob, T. Linderl, A. Wilke, A. Opitz, R. Hansson, A.S. Anselmo, Y. Ozawa, Y. Nakayama, H. Ishii, N. Koch, E. Moons, F. Schreiber, W. Brütting
Voc from a morphology point of view: the influence of molecular orientation on the open circuit voltage of organic planar heterojunction solar cells
J. Phys. Chem. C 118 (2014) 26462. DOI: 10.1021/jp506180k

A. Opitz, J. Frisch, R. Schlesinger, A. Wilke, N. Koch
Energy level alignment at interfaces in organic photovoltaic devices
J. Elec. Spec. Rel. Phen. 190 (2013) 12. DOI: 10.1016/j.elspec.2012.11.008

P. Amsalem, J. Niederhausen, A. Wilke, G. Heimel, R. Schlesinger, S. Winkler, A. Vollmer, J. P. Rabe, N. Koch
Role of charge transfer, dipole-dipole interactions, and electrostatics in Fermi-level pinning at a molecular heterojunction on a metal surface
Phys. Rev. B 87 (2013) 035440. DOI: 10.1103/PhysRevB.87.035440

G. Heimel, S. Duhm, I. Salzmann, A. Gerlach, A. Strozecka, J. Niederhausen, C. Bürker, T. Hosokai, I. Fernandez-Torrente, G. Schulze, S. Winkler, A. Wilke, R. Schlesinger, J. Frisch, B. Bröker, A. Vollmer, B. Detlefs, J. Pflaum, S. Kera, K. J. Franke, N. Ueno, J. I. Pascual, F. Schreiber, N. Koch
Charged and metallic molecular monolayers through surface-induced aromatic stabilization
Nature Chem. 5 (2013) 187. DOI: 10.1038/nchem.1572

A. Wilke, J. Endres, U. Hörmann, J. Niederhausen, R. Schlesinger, J. Frisch, P. Amsalem, J. Wagner, M. Gruber, A. Opitz, A. Vollmer, W. Brütting, A. Kahn, N. Koch
Correlation between interface energetics and open circuit voltage in organic photovoltaic cells
Appl. Phys. Lett. 101 (2012) 233301. DOI: 10.1063/1.4769360

J. Niederhausen, P. Amsalem, A. Wilke, R. Schlesinger, S. Winkler, A. Vollmer, J. P. Rabe, N. Koch
Doping of C60 monolayers by Fermi-level pinning induced electron transfer
Phys. Rev. B 86 (2012) 081411. DOI: 10.1103/PhysRevB.86.081411

A. Opitz, R. Banerjee, S. Grob, M. Gruber, A. Hinderhofer, U. Hörmann, J. Kraus, T. Linderl, C. Lorch, A. Steindamm, A.K. Topczak, A. Wilke, N. Koch, J. Pflaum, F. Schreiber, W. Brütting
Charge Separation at Nanostructured Molecular Donor–Acceptor Interfaces.
In K. Leo (Ed.), Elementary Processes in Organic Photovoltaics (Volume 272) (pp. 77-108).
Switzerland: Springer International Publishing (2017). ISBN 978-3-319-28336-4
DOI: 10.1007/978-3-319-28338-8_4

Last updated on 2020-16-03 at 23:16