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DS: Fachverband Dünne Schichten

DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials

DS 35.59: Poster

Wednesday, April 2, 2014, 17:00–20:00, P1

The degradation process of spin coated and flexo printed polytriarylamine thin films studied by IR ellipsometry — •Michael Sendner, Jens Trollmann, and Annemarie Pucci — Kirchhoff-Institut für Physik der Universität Heidelberg

Due to their potential in a roll-to-roll printing process, solution processed organic semiconductor thin films require basic research on the production-related properties. Especially, the knowledge of the degradation processes in organic devices consisting of such thin films is of importance for the application. Therefore, spin coated and flexo printed thin films of polytriarylamine (PTAA) that is used in p-type organic field effect transistors were degraded in a controlled manner by heat and high humidity (65°C, 85% r.h.) over a period of 60 days. The changes of vibrational modes of PTAA during the degradation process were studied in the mid infrared region by IR ellipsometry. Additionally, changes in film morphology were investigated with atomic force microscopy. Our work contributes to a better understanding of the degradation processes and helps to prevent aging of organic devices. Funding by BMBF (Polytos) is gratefully acknowledged.