Journal
PHYSICAL REVIEW B
Volume 81, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.125206
Keywords
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Funding
- U.S. National Science Foundation [CHE 0628252-CRC]
- Sloan Foundation
- Dreyfus Foundation
- Research Corporation
- Department of Energy's Office of Biological and Environmental Research located at Pacific Northwest National Laboratory
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Materials Science and Engineering Physics
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Variable-temperature and polarized scanning photoconductivity measurements on Zn1-xCoxO epitaxial films allow description of sub-band-gap Co2+-derived photoionization excited states in this archetypal diluted magnetic oxide. Low-temperature (27 K) measurements demonstrate spontaneous ionization from the photogenerated T-4(1)(P) d-d excited state, despite the highly localized nature of this excitation. Ionization involves relaxation from this d-d state to the lower Co2+/3+ donor-type photoionization level. Variable-temperature photoconductivity measurements reveal an additional thermally assisted ionization process that enhances the d-d photoconductivity at higher temperatures. The energy barrier to thermal ionization from the T-4(1)(P) excited state at low temperatures is estimated to be E-a approximate to 43 meV.
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