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Effect of Ag on the microstructure and electrical properties of ZnO by Shu-Ting Kuo; Wei-Hsing Tuan; Jay Shieh; Sea-Fue Wang is a Materials Science article available to read on EtoBox.

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Various amounts of silver particles, 0.08-7.7 mol%, are mixed with zinc oxide powder and subsequently co-fired at 800-1200 • C. The effects of Ag addition on the microstructural evolution and electrical properties of ZnO are investigated. A small Ag doping amount ( 3.8 mol%). It is evident that a tiny amount of Ag (∼0.08 mol%) may dissolve into the ZnO lattice. High-resolution TEM observations give direct evidences on the segregation of Ag solutes at the ZnO grain boundaries. The grain boundary resistance of ZnO increases 35-fold with the presence of Ag solute segregates. The Ag-doped ZnO system exhibits a nonlinear electric current-voltage characteristic, confirming the presence of an electrostatic barrier at the grain boundaries. The barrier is approximately 2 V for a single grain boundary.

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Author

Shu-Ting Kuo; Wei-Hsing Tuan; Jay Shieh; Sea-Fue Wang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

2007

Language

EN

Field

Materials Science (Physical Sciences)