<論文>II-VI半導体ZnOへのCu添加,Cu,Li共添加の影響

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Both the electric properties of divalent Cu^<2+>(CuO)-doped ZnO and the dielectric properties of Cu_2O and Li_2O co-doped ZnO were studied. In CuO-doped ZnO, the solubility of Cu in ZnO converged on 0.9mol% (x=0.009) in the specimen heat-treated at 800℃ for 72 hours. The activation energy calculated from electric conductivity is about 0.9eV, which does not depend on substituted Cu. Effect of substituted Cu on electrical conductivity is different in Cu_2O-doped ZnO from CuO-doped ZnO, but obtained activation energy is almost the same with both specimens. Dielectric properties in Cu_2O and Li_2O co-doped ZnO were studied in the two kind of specimens as follows, (1) Cu_2O and Li_2O were doped to ZnO simultaneously and (2)Li_2O was doped after Cu_2O had been doped to ZnO. The dielectric anomalies were observed in both specimens in the temperature range from 80 to 90℃, but the dielectric hysteresis loop was not observed.
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