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 8.92: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Organic Thin Film Transistor Based Sensors with Chemically Reactive Interfacial Layers — •Peter Pacher1, A. Lex2, V. Proschek1, O. Werzer1, P. Frank1, S. Temmel2, E. Tchernychova3, M. Szezen3, G. Hlawacek4, Q. Shen4, C. Teichert4, W. Grogger3, R. Resel1, R. Schennach1, A. Winkler1, C. Slugovc2, G. Trimmel2, and E. Zojer1 — 1Institute of Solid State Physics, TU Graz , 8010 Graz, Austria — 2Institute for Chemistry and Technology of Organic Materials, TU Graz — 3FELMI-ZFE, TU Graz — 4Institute of Physics, MU Leoben, 8700 Leoben, Austria
We discuss the influence of reactive thin layers on the device performance of P3HT based organic thin film transistors (OTFTs). The CSTS layer (2-(4-Chlorosulfonylphenyl)-ethyltrichlorosilane) is characterized by XRR thickness measurements. Reflection absorption infrared spectroscopy (RAIRS) is used to study the chemical reaction of CSTS with ammonia gas (NH3). Density functional theory calculations are presented to explain the origin of the observed peaks and peak shifts of the RAIRS spectra and are in good agreement with our experimental data. XPS studies on samples before and after NH3 exposure are a further proof for the proposed reaction to happen.
Particular attention is paid to how such thin films can be used as sensitizers. We find that the turn on voltage shifts from large positive values to negative values.
We believe that this novel sensor concept can open new routes for the design and the optimization in the field of organic sensors.