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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.79: Poster

Tuesday, March 27, 2007, 18:00–20:00, Poster B

Annealing Studies on Organic Photodetectors using Impedance Spectroscopy — •Edgar Zaus¹, Sandro Tedde¹, Tobias Rauch¹, Jens Fürst¹, and Gottfried Döhler² — ¹Siemens AG, CT MM 1, Günther-Scharowsky-Str. 1, 91050 Erlangen — ²Max Planck Research Group for Optics, Information and Photonics, University of Erlangen-Nürnberg, Günther-Scharowsky-Str. 1, 91052 Erlangen

Organic photo detectors offer various advantages over inorganic devices, e.g. large area imaging at low fabrication costs and the realization of the devices on flexible substrates. A poly-3-hexyl-thiophene (P3HT):[6,6]-phenyl C61 butyric acid methyl ester (PCBM) blend, forming a bulk heterojunction, is a widely used absorbing material due to its good exciton dissociation properties. Annealing of the device leads to a significant improvement of bulk heterojunction organic solar cells as reported in literature. We show that also the performance of organic photodetectors is influenced positively by thermal treatment. Results obtained from impedance spectroscopy measurements in addition to current-voltage characteristics and charge extraction by linearly increasing voltage (CELIV) measurements give insight into the annealing effects.