Dresden 2009 – wissenschaftliches Programm

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.37: Poster

Donnerstag, 26. März 2009, 16:30–19:00, P1A

Investigation of novel organic n-type semiconductors in photovoltaic bulk heterojunction — •Moritz Liedtke^1,2, Andreas Sperlich¹, Carsten Deibel¹, Vladimir Dyakonov^1,2, Patrick Witte³, and Alexander Hirsch³ — ¹Julius-Maximilians-University of Würzburg, Institute of Physics, Experimental Physics VI, D-97074 Würzburg — ²Bavarian Centre for Applied Energy Research e.V. (ZAE Bayern), D-97074 Würzburg — ³Friedrich-Alexander-University Erlangen-Nürnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, D-91054 Erlangen

Two novel organic n-type semiconductors are investigated due to their function as electron acceptor for applications in organic electronic devices to widen the knowledge of how molecule structure influences the excitation processes in organic electronics. Bispyrenylfullerene and Octadecyl-Capronacidesterfullerene are C60 derivates with sidechains more featured compared to the commonly used [6,6] phenyl-C61-butyric acid methyl ester (PCBM). In bulk heterojunction devices regioregular poly(3-hexylthiophene) (P3HT) was used as donor. The materials, pristine and in blend, were studied in view of light absorption, their quenching abilities of the P3HT photoluminescence as well as excited states. Furthermore, the spinstate of the excited states was determined by light-induced electron spin resonance. Combining these complimentary experimental techniques, we obtained information on the generation of excited states, their nature, and the efficiency of the subsequent charge carrier separation.