Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster Session 1 (joint session with BP)
CPP 19.52: Poster
Dienstag, 1. April 2014, 09:30–13:00, P1
Understanding exciton dissociation at different donor-acceptor interfacial morphologies using field dependent photocurrent measurements — •Tobias Hahn1, Marlene Schuberth2, Peter Strohriegl2, and Anna Köhler1 — 1University of Bayreuth, Exp. Physics 2 — 2Bayreuth Institute of Macromol. Research (BIMF)
Photocurrent measurements up to high electric fields may be employed to assess whether exciton dissociation prevails at an extended donor-acceptor interface with interfacial dipoles, or whether it takes place by dopant-assisted dissociation at individual donor sites. Here we have investigated the influence of acceptor diffusion into the donor layer on the contribution between these two processes, and on the impact this has on the overall solar cell efficiency. We used a donor polymer that can be cross-linked by various degrees such as to control the thermally activated diffusion of the acceptor C60 molecule into the film. Future work will focus on replacing acceptor C60 molecule by inorganic materials including an amorphous silicon layer or, eventually, silicon nanoparticles. The aim of these studies will be to understand the mechanism underlying the dissociation process at the organic / inorganic interface in hybrid solar cells.