Dielectric spectroscopy studies of ZnO single crystal
Cheng Peng-Fei (成鹏飞)a, Li Sheng-Tao (李盛涛)b, Wang Hui (王辉)b
a School of Science, Xi’an Polytechnic University, Xi’an 710048, China; b State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Abstract Dielectric relaxation and charge transport induced by electron hopping in ZnO single crystal are measured by using a novocontrol broadband dielectric spectrometer. Typical Debye-like dielectric relaxation originating from electronic hopping between electronic traps and conductive band in surface Schottky barrier region is observed for ZnO single crystal-Au electrode system. However, after insulation of ZnO single crystal by heat treatment in rich oxygen atmosphere, dielectric relaxation and alternating current conductance are observed simultaneously in the dielectric spectra, implying that dielectric relaxation and charge transport can be induced simultaneously by electronic hopping at high temperature in an ordered system. The intrinsic correlation between local dielectric relaxation and long range charge transport offers us a new method to explore complicated dielectrics.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51277138 and 50972118), the Scientific Research Plan of the Education Department of Shaanxi Province, China (Grant No. 12JK0434), and the Doctoral Scientific Research Foundation of Xi’an Polytechnic University, China (Grant No. BS0814).
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