Optical detection of electron paramagnetic resonance in room-temperature electron-irradiated ZnO

Journal Article · Tue Mar 15 04:00:00 EST 2005 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.71.125210· OSTI ID:20666268

Vlasenko, L S; Watkins, G D ^[1]

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1. Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, Pennsylvania 18015-3182 (United States)

The dominant defect observed in the photoluminescence (PL) of room-temperature electron-irradiated ZnO by optical detection of electron paramagnetic resonance (ODEPR) is determined to be the positively charged oxygen vacancy (V{sub O}{sup +}). Its spectrum, labeled L3, was previously observed in a 4.2 K in situ irradiation study [Yu. V. Gorelkinskii and G. D. Watkins, Phys. Rev. B 69, 115212 (2004)], but it was thought there not to be stable at room temperature and was not identified. Here it is found to be stable to 400 deg. C, where it disappears. It is observed as a competing process (negative signal) to the dominant PL band produced by the irradiation at {approx}700 nm, but is positive in a weaker band at {approx}600 nm. Models are presented for its electrical level position in the gap to explain the results. Two other ODEPR signals are also detected, one of which is tentatively identified as also associated with the oxygen vacancy.

• OSTI ID: 20666268
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 12 Vol. 71; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
DEFECTS
ELECTRON BEAMS
ELECTRON SPIN RESONANCE
ELECTRONS
IRRADIATION
PHOTOLUMINESCENCE
SEMICONDUCTOR MATERIALS
TEMPERATURE RANGE 0273-0400 K
VACANCIES
ZINC OXIDES