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Title

Bulk-grain resistivity and positive temperature coefficient of ZnO-based varistors

AuthorsFernández Hevia, D.; Frutos, José de ; Caballero Cuesta, Amador ; Fernández Lozano, José Francisco
Issue Date2003
PublisherAmerican Institute of Physics
CitationApplied Physics Letters 82(2): 212-214 (2003)
AbstractWe analyze the conditions that allow the bulk-grain regions of a polycrystalline semiconductor to be explored through electrical measurements. The temperature dependence of grain resistivity in ZnO varistors (300-430 K) is presented, and a positive temperature coefficient is found. This is consistent with a free-carrier density approaching exhaustion, and an electron mobility controlled mainly by lattice (both optical and acoustical) scattering. No grain conductivity activation energy is to be found above room temperature and, therefore, ac-impedance techniques can be inadequate for the evaluation of grain conductivity and shallow donor activation energy. (C) 2003 American Institute of Physics.
Publisher version (URL)http://dx.doi.org/10.1063/1.1534620
URIhttp://hdl.handle.net/10261/85783
DOI10.1063/1.1534620
Identifiersdoi: 10.1063/1.1534620
issn: 0003-6951
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