Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 72: Poster Session: Si-based Photovoltaics / Inorganic Photovoltaics / Structure and Transport in Organic Photovoltaics / Organic Semiconductors
HL 72.25: Poster
Mittwoch, 28. März 2012, 16:00–19:00, Poster D
Organic semiconducting complexes at the molecular scale — •Matthieu Dvorak, Markus Müller, Frank Stienkemeier, and Elizabeth von Hauff — Physics Institute, University of Freiburg, Hermann-Herder Str. 3, 79104 Freiburg, Germany
An improved understanding of the parameters which influence the charge transfer between donor and acceptor molecules is highly important to improve the efficiency of organic solar cells. Different parameters such as the bulk mobility, the molecular structure and the ordering proved to play an important role on the charge transfer.1 In thin film or solution systems it is most of the time not possible to disentangle these different mechanisms at a molecular scale. On the contrary, helium droplets, due to their cold, superfluid and weak interacting properties, has proved to be the perfect matrix for the study of optical properties at the molecular scale, related to a spectral resolution increased by three orders of magnitude compared to thin film or solution measurements. This precision proved to be helpful to confirm recent calculations on PTCDA complexes (3,4,9,10-perylene-tetracarboxylic-
dianhydride) based on a Frenkel exciton model.2
Making use of the enhanced spectroscopic resolution to study the charge transfer process at a molecular scale as well as the possibility to vary the donor-acceptor distance are expected to reveal new information to improve the charge transfer in donor-acceptor systems which is relevant in organic photovoltaic.
1 M. Hallermann et al.; Appl. Phys. Lett., 97, 023301 (2010)
2 J. Roden et al.; J. Chem. Phys., 134, 054907 (2011)