Hydrogen passivation of calcium and magnesium doped β-Ga₂O₃

Journal Article · Fri Mar 01 00:00:00 EST 2019 · Proceedings of SPIE - The International Society for Optical Engineering

DOI:https://doi.org/10.1117/12.2507187· OSTI ID:1601471

Ritter, Jacob ^[1]; Lynn, Kelvin G. ^[1]; McCluskey, Matthew D. ^[1]

---

1. Washington State Univ., Pullman, WA (United States)

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 bond-stretching 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 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.

• Research Organization: Washington State Univ., Pullman, WA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
• Grant/Contract Number: FG02-07ER46386
• OSTI ID: 1601471
• Journal Information: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 10919; Conference: SPIE OPTO, San Francisco, CA (United States), 2-7 Feb 2019; ISSN 0277-786X
• Publisher: SPIE
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Gallium Oxide
Ga2O3
Magnesium
Hydrogen
Calcium
Iridium
IR Spectroscopy
Absorption
Crystals