Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films

DS 42.25: Poster

Mittwoch, 16. März 2011, 15:00–17:30, P1

Photodegradation of P3HT - a systematic study of environmental factors — •Holger Hintz¹, Ulf Dettinger¹, Hans-Joachim Egelhaaf², Larry Luer³, Heiko Peisert¹, Thomas Chassé¹, and Jens Hauch² — ¹Eberhard-Karls-University, Institute for Physical and Theoretical Chemistry, Auf der Morgenstelle 8, D-72076 Tübingen, Germany — ²Konarka Technologies GmbH, Landgrabenstr. 94, D-90443 Nürnberg, Germany — ³Madrid Institute for Advanced Studies, IMDEA Nanociencia, Mòdulo 13; Avda Fco Tomas y Valiente, 7, 28049 Madrid, Spain

The influence of environmental factors on the degradation process of P3HT film has been investigated quantitatively. The decay kinetics of the polymer absorption during variation of intensity and spectral distribution of the incident light, oxygen concentration, humidity level as well as temperature are monitored using infrared and UV/VIS absorption spectroscopy. Oxygen diffusion into the polymer film has been investigated using fluorescence spectroscopy. The degradation process is light initiated with a strong increase of the effectiveness towards the ultraviolet region of the spectrum. The photo oxidation is not oxygen diffusion limited although an activation energy of 26 kJmol-1 was observed for both degradation and oxygen diffusion. The observed kinetics, especially its dependence on wavelength of the incident light, point to a radical- based degradation process in the solid state rather than a singlet oxygen based mechanism as it is observed in the liquid phase. The presence of humidity strongly affects the degradation process although water itself does not decompose the polymer.