Dielectric spectroscopy studies of ZnO single crystal

doi:10.1088/1674-1056/22/10/107701

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.

Keywords: ZnO single crystal electronic hopping conductance dielectric relaxation

Received: 09 December 2012
Revised: 02 April 2013
Accepted manuscript online:

PACS:	77.55.hf	(ZnO)
	72.20.Ee	(Mobility edges; hopping transport)
	72.20.-i	(Conductivity phenomena in semiconductors and insulators)
	77.22.Gm	(Dielectric loss and relaxation)

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).

Corresponding Authors: Cheng Peng-Fei
E-mail: pfcheng@xpu.edu.cn

Cite this article:

Cheng Peng-Fei (成鹏飞), Li Sheng-Tao (李盛涛), Wang Hui (王辉) Dielectric spectroscopy studies of ZnO single crystal 2013 Chin. Phys. B 22 107701

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