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Proceedings Paper

Temperature-stabilized silicon-based surface-acoustic-wave gas sensors for the detection of solvent vapors
Author(s): Stefan Bender; W. Mokwa
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Paper Abstract

In the current paper a dual-delay-line- and a resonator- device based on CMOS-silicon-technology is presented. As a piezoelectric layer ZnO is used. The layer was deposited at room temperature in a RF magnetron sputter process. Using x- ray diffraction it could be shown that the crystals are mostly oriented with the c-axis (hexagonal structure) perpendicular to the surface which is necessary to conduct surface acoustic waves. Pt electrodes were designed for frequencies between 140 and 600 MHz and were deposited on top using a lift-off-process. A poly-silicon heating resistor was integrated as a sublayer for controlling and changing of the temperature of the SAW-device for studying the influence of temperature on the mass sensitive layer. A Pt thin film resistance served for temperature measurement. The performance of the devices were compared to standard quartz based SAWs.

Paper Details

Date Published: 18 December 1998
PDF: 8 pages
Proc. SPIE 3539, Chemical Microsensors and Applications, (18 December 1998); doi: 10.1117/12.333739
Show Author Affiliations
Stefan Bender, Technische Univ. Aachen (Germany)
W. Mokwa, Technische Univ. Aachen (Germany)

Published in SPIE Proceedings Vol. 3539:
Chemical Microsensors and Applications
Stephanus Buettgenbach, Editor(s)

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