Regensburg 2004 – wissenschaftliches Programm

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SYOH: Organic and Hybrid Systems for Future Electronics

SYOH 5: Poster

SYOH 5.33: Poster

Donnerstag, 11. März 2004, 18:00–21:00, B

Photo Electron Spectroscopy of Silicon-Organic Pigment Interfaces — •Ulrich Weiler¹, Thomas Mayer¹, Ralf Hunger¹, Wolfram Jaegermann¹, Christian Kelting², and Derck Schlettwein² — ¹Technische Universität Darmstadt, FB Material- und Geowissenschaften, FG Oberflächenforschung — ²Universität Oldengurg, Physikalische Chemie 1

One of the prerequisites to obtain a photovoltaically active composite material uniting high light absorption of an organic dye with good charge separation and transport properties of Si is the specific alignment of the dye frontier orbitals versus the Si bands: in order to inject both, the photo excited electrons from the dye LUMO into the Si conduction band and the holes from the dye HOMO into the Si valence band, the LUMO should energetically be situated just above the CB and the HOMO just below the VB. According to the Anderson model, ZnPc should match perfectly this requirement. As model systems for the composite, the interface properties of ZnPc and related organics adsorbed on different Si surfaces have been characterized with photoelectron spectroscopy. Experimental results of ZnPc on H-terminated Si are in good agreement to the Anderson model implying that no additional dipoles are formed at the interface. In addition, the experimental set-up of our deposition system for silicon organic compounds will be explained on our poster. In order to conserve the organic dyes during growth of the compound, Si will be deposited from a remote hot wire source by CVD and the dyes will be co-sublimated from a second source.