Impact of the electrode material and shape on performance of intrinsically tunable ferroelectric FBARs
Journal article, 2014

Experiment-based analysis of losses in tunable ferroelectric xBiFeO 3-(1-x)BaTiO3 (BF-BT) film bulk acoustic wave resonators (FBARs) is reported. The Q-factors, effective coupling coefficients, and tunabilities are considered as functions of surface roughness of the ferroelectric film, the acoustic impedance and shape of the electrodes/ interconnecting strips, leakage of acoustic waves into the substrate via Bragg reflector, and the relative thicknesses of the electrodes and ferroelectric film. Compared with Al, the high acoustic impedance of Pt electrodes provides higher Q-factor, coupling coefficient, and tunability. However, using Pt in the interconnecting strips results in reduction of the Q-factor.

Author

Andrei Vorobiev

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Spartak Gevorgian

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

0885-3010 (ISSN)

Vol. 61 5 840-848

Subject Categories

Communication Systems

Infrastructure

Nanofabrication Laboratory

DOI

10.1109/TUFFC.2014.6805697

More information

Created

10/7/2017