Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 27: Poster: Organic Electronics and Photovoltaics
CPP 27.15: Poster
Wednesday, March 24, 2010, 17:30–19:00, Poster C
Temperature dependent photoinduced absorption measurements on oligothiophene derivatives — •Christian Körner1, Hannah Ziehlke1, Karl Leo1, Roland Fitzner2, Egon Reinold2, Peter Bäuerle2, and Moritz Riede1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden — 2Institut für Organische Chemie II und Neue Materialien, Universität Ulm
Oligothiophenes are among the most promising small molecules for use in organic photovoltaic devices (OPV). The current efficiency world record of 6.1% on an area of >2cm2 is based on using an oligothiophene derivative as one of the absorber materials. Notwithstanding this success, the underlying processes e.g. for charge generation at the donor-acceptor heterointerface are still subject of intense discussions.
By small variations of the molecule structure we are able to systematically tune the electrical and optical properties of these molecules. The energy levels which are mainly determined by the backbone length and the terminating end groups are supposed to strongly correlate with energy and charge transfer processes like the initial charge separation step at the donor-acceptor heterojunction in OPV.
Here we present temperature dependent PIA measurements of dicyanovinyl end-capped oligothiophenes with various backbone lengths. The nature and recombination dynamics of the long living triplet excitons and cations present in optically excited oligothiophene single layers and in mixed layers with the acceptor C60 are determined and compared.