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Lookup NU author(s): Dr Chen Fu
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Shear-horizontal (SH) surface acoustic wave (SAW) propagation characteristics in IDT/(110) ZnO/SiO2/Si multilayered structure were theoretically investigated using 3-dimensions (3D) finite element analysis (FEA). X-ray diffraction result shows that the prepared ZnO films have preferred (110) orientation with its c-axis parallel to the substrate. 3D FEA results and the out of plane vibration experiment confirmed that SH-SAW was successfully excited in the multilayered structure. The phase velocities V-p, electromechanical coupling coefficients K-2, and temperature coefficient of frequency (TCF) dispersion properties of mode 0 were studied considering various thicknesses of ZnO and SiO2 thin films, which were verified by experiments. SiO2 film with a positive TCF not only compensate the negative TCF of the (110) ZnO but also enhance the K-2. A large K-2 of 3.37 and nearly zero TCF of -0.1 ppm/degrees C was achieved in SH-SAW device based on IDT/(110) ZnO(2 mu m)/SiO2(1 mu m)/Si multilayer structure, which is promising for high sensitive and temperature stable bio-sensing application. (C) 2016 Elsevier B.V. All rights reserved.
Author(s): Luo JT, Quan AJ, Fu C, Li HL
Publication type: Article
Publication status: Published
Journal: Journal of Alloys and Compounds
Print publication date: 05/02/2017
Online publication date: 12/09/2016
Acceptance date: 11/09/2016
ISSN (print): 0925-8388
ISSN (electronic): 1873-4669
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