The Prepration of p-Type Transparant Conducting Oxides CuCr1-xCaxO2 and Research about Its Electrical and Optical Property
- Received Date: 2003-03-03
- Ca-doped CuCrO2，Delafossite，p-type conducting oxides /
Abstract: Transparant conducting oxides showing the combination of high electrical conductivity and high transparency for visible light have been based on electron doping into a conduction band. For p-type delafossite oxides，the valence band is commonly the oxygen 2p band. Doping to produce holes in this band but the electronic conductivity of such p-type oxides is highly activated and can generally only be measured at temperatures well above room temperature. So it is very desirable to improve conductivity by doping wide-gap delafossites as transparant conducting oxides nowadays. The article reported the prepration and characterization of Ca-doped CuCrO2 monophasic delafossites. It was found that conductivity had a notable improvement after Ca-doped and reached 3. 2×10-2 S/cm for x=0.06 Ca-doped at room temperature and the structures had not been changed. The temperature dependence of electrical conductivity around room temperture was consistent with thermal activation type very well from 200 K to 300 K. The activation energe was 0. 36 eV before doping，but it changed to 0.27 eV when Ca-doped. This phenomenon suggest that in pure non-doped CuCrO2，carrier was the Cu+ d. After Ca-doped，the Cu2+ was formed from the Cu+ by a charge compensating process when the divalent Ca2+ substituted for the trivalent Cr3+ . The Seebeck coefficients being large positive constants implied that all the samples were p-type conducting oxides.
|Citation:||Huang Hua, Zhu Changfei, Liu Wei. The Prepration of p-Type Transparant Conducting Oxides CuCr1-xCaxO2 and Research about Its Electrical and Optical Property[J]. Chinese Journal of Chemical Physics , 2004, 17(2): 161-164. doi: 10.1088/1674-0068/17/2/161-164|