Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 31: Poster II

HL 31.67: Poster

Tuesday, February 26, 2008, 16:30–19:00, Poster D

Development of mesoporous TiO₂-electrodes as ordered acceptor matrix for organic-inorganic bulk-heterojunction solar cells — •Jan Friedmann¹, Bettina Herbig³, Maria Hammer¹, Andreas Sperlich¹, Moritz Liedtke², Ingo Riedel¹, Carsten Deibel², and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Physical Institute, Julius-Maximilian University of Würzburg, Am Hubland, D-97074 Würzburg — ²ZAE Bayern, Div. Functional Materials for Energy Technology, Am Hubland, D97074 Würzburg, Germany — ³Fraunhofer Institut für Silicatforschung, Neunerplatz 2, D97082 Würzburg, Germany

There is a vast variety of intriguing concepts for the improvement of organic photovoltaic devices. One approach focuses on the application of mesoporous acceptor-type metal oxides (e.g., TiO₂) infiltrated by a donor-type conjugated polymer (P3HT) forming a hybrid bulk heterojunction. To establish efficient dissociation of photogenerated excitons in the polymer phase the porosity of the acceptor-template is to be optimized for twice the exciton diffusion length. We realized mesoporous TiO₂-electrodes derived from a sol-gel process using structure-directing block-copolymers and evaporation induced self assembbley technique. The structure of the mesoporous films was characterized by XRD-analysis and TEM-imaging. We experimentally verified the efficiency of this elementary via photoluminescence quenching experiments and photoinduced absorption spectroscopy to qualify the formation of long-lived excited states such as polarons, triplet excitons.