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- W292429462 abstract "In this study, we investigated the effects of Cr dopant (1.0 at% <TEX>$Cr_2O_3$</TEX> sintered at <TEX>$1000^{circ}C$</TEX> for 1 h in air) on the bulk trap (i.e. defect) and interface state levels of ZnO using dielectric functions (<TEX>$Z^*$</TEX>, <TEX>$M^*$</TEX>, <TEX>$Y^*$</TEX>, <TEX>$varepsilon^*$</TEX>, and <TEX>$tan{delta}$</TEX>), admittance spectroscopy (AS), and impedance-modulus spectroscopy (IS & MS). For the identification of the bulk trap levels, we examine the zero-biased admittance spectroscopy and dielectric functions as a function of frequency and temperature. Impedance and electric modulus spectroscopy is a powerful technique to characterize grain boundaries of electronic ceramic materials as well. As a result, three kinds of bulk defect trap levels were found below the conduction band edge of ZnO in 1.0 at% Cr-doped ZnO (Cr-ZnO) as 0.11 eV, 0.21 eV, and 0.31 eV. The overlapped defect levels (<TEX>$Zn^{..}_i$</TEX> and <TEX>$V^{cdot}_0$</TEX>) in admittance spectra were successfully separated by the combination of dielectric function such as <TEX>$M^*$</TEX>, <TEX>$varepsilon^*$</TEX>, and <TEX>$tan{delta}$</TEX>. In Cr-ZnO, the interfacial state level was about 1.17 eV by IS and MS. Also we measured the resistance (<TEX>$R_{gb}$</TEX>) and capacitance (<TEX>$C_{gb}$</TEX>) of grain boundaries with temperature using impedance-modulus spectroscopy. It have discussed about the stability and homogeneity of grain boundaries using distribution parameter (<TEX>$alpha$</TEX>) simulated with the Z-logf plots with temperature." @default.
- W292429462 created "2016-06-24" @default.
- W292429462 date "2009-11-01" @default.
- W292429462 modified "2023-09-24" @default.
- W292429462 title "Defects and Grain Boundary Properties of Cr-doped ZnO" @default.
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- W292429462 doi "https://doi.org/10.4313/jkem.2009.22.11.949" @default.
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