Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.16: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Light-induced p-doping of P3HT and P3HT/Fulleren blends by oxygen studied by Photoelectron Spectroscopy — •Umut Aygül, Holger Hintz, Heiko Peisert, and Thomas Chassé — Universität Tübingen, Institut für Physikalische und Theoretische Chemie, Auf der Morgenstelle 18, 72076 Tübingen

Organic photovoltaic cells (OPVC) based on donor-acceptor blends present a quite new technique for environmental friendly energy conversion although their efficiency and lifetime is currently rather low compared to inorganic solar cells. Detailed unterstanding of the electronic properties and interface properties (e.g. electrodes or other organic materials) are required to increase efficiency and lifetime. We study the influence of oxygen and light (AM 1.5) on the energy level alignment of Poly(3-hexylthiophene) (P3HT) and P3HT/Fullerene blend films. The samples are alternately exposed to light and oxygen and then annealed. The electronic properties and interface properties are monitored subsequently by X-ray and ultraviolet photoelectron spectroscopy (XPS/UPS) in order to probe both changes in the electronic structure and the chemical composition of the film. The exposure to light and oxygen leads to reversible and irreversible effects. The reversible effect is an oxygen induced p-doping of the semiconductor whereas the irreversible part is the photooxidation of the polymer which does not alter the electronic structure.