Fabrication of ZnO-based thick film varistors with high potential gradient

稀有金属（英文版）, 2010, 29(4): 390-395. doi: 10.1007/s12598-010-0136-x

^1, , ^2, , ^3,

1.State Key Laboratory of Precision Spectroscopy,Department of Physics,East China Normal University,Shanghai 200062,China

2.State Key Laboratory of Precision Spectroscopy,Department of Physics,East China Normal University,Shanghai 200062,China

3.State Key Laboratory of Precision Spectroscopy,Department of Physics,East China Normal University,Shanghai 200062,China

基金项目: the Shanghai Municipal Natural Science Foundation(08ZR1406700) The work is financially supported by the Nano Special Plan from Shanghai Municipal Science and Technology Plan of Commission(0852nm06000)

Fabrication of ZnO-based thick film varistors with high potential gradient

KE Lei ^1, , JIANG Dongmei ^2, , MA Xueming ^3,

1.State Key Laboratory of Precision Spectroscopy,Department of Physics,East China Normal University,Shanghai 200062,China

2.State Key Laboratory of Precision Spectroscopy,Department of Physics,East China Normal University,Shanghai 200062,China

3.State Key Laboratory of Precision Spectroscopy,Department of Physics,East China Normal University,Shanghai 200062,China

Keywords： condensed matter physics

ZnO-based thick film varistors have been fabricated by Y2O3 doping and low-temperature sintering,of which the sample with the best electrical properties has a high potential gradient value of 3159.4 V/mm.The effects of Y2O3 doping concentration and sintering temperature on the potential gradient of the samples were systematically investigated.The results show that the sample with the best electrical properties can be obtained by doping 0.08 mol% Y2O3 and sintering at 725℃.Under these optimum preparation conditions,the leakage current and the nonlinear coefficient are found to be 36.4 μA and 13.1.The sample with the best electrical properties has a grain size of 1.290 μm,a single grain boundary voltage of 4.08 V,a barrier height of 0.81 eV,and a depletion layer width of 10.2 nm,which are determined by thermionlc emission.Small grain size with good grain boundary characteristics is beneficial to improve the electrical properties of varistors and promote the potential gradient.

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Fabrication of ZnO-based thick film varistors with high potential gradient

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