Regensburg 2007 – wissenschaftliches Programm
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.11: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Ballistic Electron Transport through titanylphthalocyanine films — •Soner Özcan1, Jürgen Smoliner1, Max Andrews1, Gottfried Strasser1, Thomas Dienel2, Robert Franke2, and Torsten Fritz2 — 1Inst. fürrFestkörperelektronik, TU-Wien, Austria — 2Inst. für angewandte Photophysik, TU-Dresden, Germany
In this article, Au/titanylphthalocyanine/GaAs diodes incorporating ultra smooth thin films of the archetypal organic semiconductor Titanylphthalocyanine were investigated by Ballistic Electron Emission Microscopy/Spectroscopy (BEEM/S). To guarantee good internal sample resistance and optimized BEEM signals, molecular beam epitaxial (MBE) grown GaAs samples were used as substrates. On these substrates, TiOPc-films were grown with organic MBE. Finally, a 7 nm Au layer was evaporated on the samples. Our BEEM images indicate that the molecular beam epitaxial grown organic films have a very homogeneous transmission compared to simple evaporated films organic films. Analyzing the BEEM spectra we find that the TiOPc increases the BEEM threshold voltage compared to reference Au/GaAs diodes. The Schottky barrier heights were measured for various temperatures and show an approximately linear increase from 1.2 eV at room temperature to 1.5 eV at T=10K