Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 69: Poster Session: II-VI semiconductors; Organic semiconductors; Heterostructures

HL 69.15: Poster

Mittwoch, 13. März 2013, 16:00–20:00, Poster A

Temperature dependent exciton diffusion length in organic solar cells — •Bernhard Siegmund, Johannes Widmer, Christian Körner, Debdutta Ray, Karl Leo, and Moritz Riede — Institut für Angewandte Photophysik, Dresden, Germany

The photo-current of organic solar cells is the result of a multi-step process from the generation and diffusion of excitons to their separation into free charge carriers being then transported to the electrodes and extracted. In this work, the exciton diffusion length as function of temperature as well as a combined probability for charge carrier recombination and extraction are investigated in devices with a flat heterojunction between ZnPc and C60. To accomplish this, jV-characteristics of organic solar cells and the optical properties of the constituting single layers are studied at different temperatures in the range of 100 to 350K. Furthermore, the thickness of ZnPc is systematically varied from 7 to 70nm as well as the illumination intensity over two orders of magnitude to verify the obtained values. The results may lead to a better understanding of the temperature behaviour of organic solar cells.