Paper Title:
Design, Fabrication and Characterization of ZnO Based Thin Film Bulk Acoustic Resonators
  Abstract

In the present work we report design, simulation, fabrication and characterization of thin film bulk acoustic resonator (FBAR). The FBAR has been modeled as a single port device with two terminals. The FBAR has been fabricated using Si-SiO2-Al–ZnO-Al structure. Zinc Oxide (ZnO) films were deposited by RF magnetron sputtering using Ceramic ZnO target in Ar-O2 (1:1) ambient without external substrate heating. The XRD result confirms the preferred C-axis orientation of the films required for good piezoelectric properties. These ZnO films have been used to fabricate air gap type resonator. A four mask process sequence was used for this purpose. Lift-off process was used to pattern Al top electrode. In order to create the air cavity under the active device area, the bulk Si was etched in 40 % KOH at 80 °C. A specially designed mechanical jig was used to protect the front side of the device during anisotropic etching. Vector network analyzer was used to measure the reflection coefficient (S11: Return Loss) of the device. The resonant frequency of the resonator was measured to be 2.89 GHz as compare to the simulated frequency of 2.85 GHz with a return loss of 14.51 dB.

  Info
Periodical
Edited by
Lynn Khine and Julius M. Tsai
Pages
144-147
DOI
10.4028/www.scientific.net/AMR.254.144
Citation
S. Rathod, A. Vir Singh, S. Chandra, S. K. Koul, "Design, Fabrication and Characterization of ZnO Based Thin Film Bulk Acoustic Resonators", Advanced Materials Research, Vol. 254, pp. 144-147, 2011
Online since
May 2011
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