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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/4165

Title: Combination of e-beam lithography and of high velocity AlN/diamond-layered structure for SAW filters in X band
Authors: Kirsch, Philippe
Assouar, Mohamed B.
Elmazria, O.
El Hakiki, M.
MORTET, Vincent
Alnot, Patrick
Issue Date: 2007
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 54(7). p. 1486-1491
Abstract: In this work, we report on the fabrication results of surface acoustic wave (SAW) devices operating at frequencies up to 8 GHz. In previous work, we have shown that high acoustic velocities (9 to 12 km/s) are obtained from the layered AIN/diamond structure. The interdigital transducers (IDTs) made of aluminium with resolutions up to 250 nm were successfully patterned on AIN/diamond-layered structures with an adapted technological process. The uniformity and periodicity of IDTs were confirmed by field emission scanning electron microscopy and atomic force microscopy analyses. A highly oriented (002) piezoelectric aluminum nitride thin film was deposited on the nucleation side of the CVD diamond by magnetron sputtering technique. The X-ray diffraction effectuated on the AIN/diamond-layered structure exhibits high intensity peaks related to the (002) AIN and (111) diamond orientations. According to the calculated dispersion curves of velocity and the electromechanical coupling coefficient (K-2), the AIN layer thickness was chosen in order to combine high velocity and high K-2. Experimental data extracted from the fabricated SAW devices match with theoretical values quite well.
Notes: Nancy Univ, LPMIA, Lab Phys Milieux Ionises & Applicat, CNRS, Nancy, France. Limburgs Univ Ctr, Inst Mat Res, B-3590 Diepenbeek, Belgium.Kirsch, P, Nancy Univ, LPMIA, Lab Phys Milieux Ionises & Applicat, CNRS, Nancy, France.badreddine.assouar@lpmi.uhp-nancy.fr
URI: http://hdl.handle.net/1942/4165
DOI: 10.1109/TUFFC.2007.411
ISI #: 000247578700025
ISSN: 0885-3010
Category: A1
Type: Journal Contribution
Validation: ecoom, 2008
Appears in Collections: Research publications

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