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Report No.

Hydrogen at zinc vacancy of ZnO; An EPR and ESEEM study

Son, N. T.*; Isoya, Junichi*; Ivanov, I. G.*; Oshima, Takeshi; Janz$'e$n, E.*

Defect centers in zinc oxide (ZnO) were investigated using electron paramagnetic resonance (EPR) techniques. Un-doped ZnO samples were irradiated with 2MeV electrons with fluence ranges between 2 and 4$$times$$10$$^{18}$$ /cm$$^{2}$$ at room temperature. As a result of EPR measurements, the spectrum, labeled S1, with small-splitting doublet accompanied by weak satellites was observed. The obtained structure is shown to be the hyperfine structure because of the dipolar interaction between an unpaired electron spin and a nuclear spin of hydrogen (H). The presence of H atom in S1 was confirmed from the observation of the nuclear Zeeman frequency of H in electron spin echo envelope modulation experiments. Considering the observed spin-Hamiltonian parameters, S1 was identified to be the partly H-passivated Zn vacancy, V$$_{Zn}$$$$^{-}$$H$$^{+}$$, with the H$$^{+}$$ ion making a short O-H bond with only one nearest O neighbor of V$$_{Zn}$$ in the basal plane, being off the substitutional site, while the unpaired electron spin, by which the observed EPR signal increased, was localized on the p orbital of another O neighbor also in the basal plane.



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