Preliminary experiments and numerical calculations were conducted for developing a new ultrasonic method of evaluating resistivity distributions in ZnO single crystals using the line-focus-beam ultrasonic material- characterization system. Velocity and attenuation of leaky surface acoustic waves (LSAWs) were measured at 225MHz on three Z-cut ZnO specimens with different resistivities. We observed drastic LSAW velocity and attenuation changes associated with relaxation between piezoelectricity and semiconduction for LSAW propagation: 56 m/s in velocity and 0.012 in normalized attenuation around a resistivity of 8.3 Ωm. This ultrasonic method is promising for ZnO crystal characterization.
ASJC Scopus subject areas
- Physics and Astronomy(all)