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- W2044921185 abstract "Variable-temperature and polarized scanning photoconductivity measurements on ${text{Zn}}_{1ensuremath{-}x}{text{Co}}_{x}text{O}$ epitaxial films allow description of sub-band-gap ${text{Co}}^{2+}$-derived photoionization excited states in this archetypal diluted magnetic oxide. Low-temperature (27 K) measurements demonstrate spontaneous ionization from the photogenerated ${^{4}text{T}}_{1}(text{P})$ $dtext{ensuremath{-}}d$ excited state, despite the highly localized nature of this excitation. Ionization involves relaxation from this $dtext{ensuremath{-}}d$ state to the lower ${text{Co}}^{2+/3+}$ donor-type photoionization level. Variable-temperature photoconductivity measurements reveal an additional thermally assisted ionization process that enhances the $dtext{ensuremath{-}}d$ photoconductivity at higher temperatures. The energy barrier to thermal ionization from the ${^{4}text{T}}_{1}(text{P})$ excited state at low temperatures is estimated to be ${E}_{text{a}}ensuremath{approx}43text{ }text{meV}$." @default.
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- W2044921185 date "2010-03-19" @default.
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- W2044921185 title "Sub-band-gap photoconductivity inCo2+-doped ZnO" @default.
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- W2044921185 doi "https://doi.org/10.1103/physrevb.81.125206" @default.
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