Presentation + Paper
1 March 2019 Hydrogen passivation of calcium and magnesium doped β-Ga2O3
Jacob R. Ritter, Kelvin G. Lynn, Matthew D. McCluskey
Author Affiliations +
Proceedings Volume 10919, Oxide-based Materials and Devices X; 109190Z (2019) https://doi.org/10.1117/12.2507187
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
Calcium and magnesium doped beta-phase gallium oxide (β-Ga2O3) single crystals were Czochralski grown in an iridium crucible and subsequently annealed in hydrogen at ~800° C. IR spectroscopy was used to investigate the roles of Mg and Ca dopants as well as H and Ir impurities. An IR peak at 3492 cm-1 was previously assigned to an O-H bondstretching mode of a MgH complex in hydrogen-annealed Ga2O3:Mg and an IR peak at 3541 cm-1 is tentatively assigned to a similar mode in a CaH complex for H annealed Ga2O3:Ca. An IR peak at 5148 cm-1 is attributed to the presence of Ir4+ when magnesium is present. Excitation with several different wavelengths was used to confirm the position of the Ir level within the band gap. Our results suggest that isolated substitutional Ca dopants are less effective as deep acceptors than Mg. Polarization dependence of the iridium IR spectra is also discussed.
Conference Presentation
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacob R. Ritter, Kelvin G. Lynn, and Matthew D. McCluskey "Hydrogen passivation of calcium and magnesium doped β-Ga2O3", Proc. SPIE 10919, Oxide-based Materials and Devices X, 109190Z (1 March 2019); https://doi.org/10.1117/12.2507187
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Cited by 3 scholarly publications.
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KEYWORDS
Magnesium

Hydrogen

Gallium

Calcium

Iridium

Crystals

Absorption

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