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

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...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2005-03, Vol.71 (12), p.125210.1-125210.6, Article 125210
Main Authors: VLASENKO, L. S, WATKINS, G. D
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CRYSTALS
DEFECTS
ELECTRON BEAMS
ELECTRON SPIN RESONANCE
ELECTRONS
Exact sciences and technology
IRRADIATION
Magnetic double resonances and cross effects
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optically detected magnetic resonance (odmr)
Other solid inorganic materials
PHOTOLUMINESCENCE
Physics
SEMICONDUCTOR MATERIALS
TEMPERATURE RANGE 0273-0400 K
VACANCIES
ZINC OXIDES
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Summary: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.
ISSN:1098-0121
1550-235X
DOI:10.1103/physrevb.71.125210