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Electron paramagnetic resonance and theoretical study of gallium vacancy in β-Ga2O3
- Source :
- Applied Physics Letters. 117:032101
- Publication Year :
- 2020
- Publisher :
- AIP Publishing, 2020.
-
Abstract
- Unintentionally doped n-type beta -Ga2O3 becomes highly resistive after annealing at high temperatures in oxygen ambient. The annealing process also induces an electron paramagnetic resonance (EPR) center, labeled IR1, with an electron spin of S=1/2 and principal g-values of g(xx)=2.0160, g(yy)=2.0386, and g(zz)=2.0029 with the principal axis of g(zz) being 60 degrees from the [001](*) direction and g(yy) along the b-axis. A hyperfine (hf) structure due to the hf interaction between the electron spin and nuclear spins of two equivalent Ga atoms with a hf splitting of similar to 29G (for Ga-69) has been observed. The center can also be created by electron irradiation. Comparing the Ga hf constants determined by EPR with corresponding values calculated for different Ga vacancy-related defects, the IR1 defect is assigned to the double negative charge state of either the isolated Ga vacancy at the tetrahedral site (V-Ga(I)(2-)) or the V-Ga(I)-Ga-ib-V-Ga(I) complex. Funding Agencies|DFGGerman Research Foundation (DFG) [FR2833/63-1]; HLRN [hbc00027]; Institute of Global Innovation Research, Tokyo; University of Agriculture and Technology, Japan
- Subjects :
- 010302 applied physics
Materials science
Physics and Astronomy (miscellaneous)
Spins
Annealing (metallurgy)
Doping
chemistry.chemical_element
02 engineering and technology
Condensed Matter Physics
021001 nanoscience & nanotechnology
01 natural sciences
Molecular physics
law.invention
chemistry
law
Vacancy defect
0103 physical sciences
Electron beam processing
Gallium
0210 nano-technology
Electron paramagnetic resonance
Den kondenserade materiens fysik
Hyperfine structure
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 117
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi.dedup.....7ded6f7f98e8a988e6ff6b25900b8046