Evaluation of the acoustoelectric effect in the thickness direction of c -plane ZnO single crystals by Brillouin scattering

Shota Tomita, Takahiko Yanagitani, Shinji Takayanagi, Hayato Ichihashi, Yoshiaki Shibagaki, Hiromichi Hayashi, Mami Matsukawa

Research output: Contribution to journalArticle

Abstract

Longitudinal wave velocity dispersion in ZnO single crystals, owing to the acoustoelectric effect, has been investigated by Brillouin scattering. The resistivity dependence of the longitudinal wave velocity in a c-plane ZnO single crystal was theoretically estimated and experimentally investigated. Velocity dispersion owing to the acoustoelectric effect was observed in the range 0.007-10 Ωm. The observed velocity dispersion shows a similar tendency to the theoretical estimation and gives the piezoelectric stiffened and unstiffened wave velocities. However, the measured dispersion curve shows a characteristic shift from the theoretical curve. One possible reason is the carrier mobility in the sample, which could be lower than the reported value. The measurement data gave the piezoelectric stiffened and unstiffened longitudinal wave velocities, from which the electromechanical coupling coefficient k33 was determined. The value of k33 is in good agreement with reported values. This method is promising for noncontact evaluation of electromechanical coupling. In particular, it could be for evaluation of the unknown piezoelectricity in the thickness direction of semiconductive materials and film resonators.

Original languageEnglish
Article number235102
JournalJournal of Applied Physics
Volume121
Issue number23
DOIs
Publication statusPublished - 2017 Jun 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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