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We reinvestigated the origin of n-type conductivity in the unintentionally-doped ZnO. 1000 °C-annealed sample was free of H- and C-related impurities and still demonstrated strong conductivity revealing the significant contribution of native defects to the n-type conductivity of ZnO. However, it is hydrogen impurities, rather than native defects, that can only explain the increase of sample resistivity...
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