Hydrogen centers as a probe of VGa(2) defects in β -Ga2O3
Abstract
While a number of O-H and O-D vibrational lines have been observed for hydrogen and deuterium in β-Ga2O3, it has been commonly reported that there is no absorption with a component of the polarization E parallel to the [010], or b, axis. This experimental result has led to O-H defect structures that involve shifted configurations of a vacancy at the tetrahedrally coordinated Ga(1) site [VGa(1)] and have ruled out structures that involve a vacancy at the octahedrally coordinated Ga(2) site [VGa(2)], because these structures are predicted to show absorption for E//[010]. In this Letter, weak O-D lines at 2475 and 2493 cm−1 with a component of their polarization with E//[010] are reported for β-Ga2O3 that had been annealed in a D2 ambient. O-D defect structures involving an unshifted VGa(2) are proposed for these centers. An estimate is made that the concentration of VGa(2) in a Czochralski-grown sample is 2–3 orders of magnitude lower than that of VGa(1) from the intensities of the IR absorption lines.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 06, 2023
- Source ID
- 10.1063/5.0138904
Entities
People
- Amanda Portoff
- E. R. Glaser
- Michael Stavola
- Stephen Pearton
- W. Beall Fowler
Organizations
- Defense Threat Reduction Agency
- Lehigh University
- National Science Foundation
- United States Naval Research Laboratory
- University of Florida