Journal
SCRIPTA MATERIALIA
Volume 60, Issue 5, Pages 313-316Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2008.10.023
Keywords
Sol-gel; Crystalline oxides; Hydrogen; Annealing; Impedance spectroscopy
Categories
Funding
- National Science Council of the Republic of China [NSC95-2221-E-007-061MY3]
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Sol-gel derived Al-doped Zno (AZO) films were annealed under various degrees of hydrogen reduction treatments. Three sequential equivalent circuits were obtained by simulating the impedance spectra of the AZO films. By interpreting the equivalent circuit elements, the functional sequence of hydrogen in AZO films was disclosed. Hydrogen destroys the energetic barriers at grain boundaries and releases free electrons, which are shown by the presence of a parallel resistor-capacitor circuit, a constant phase element and a short Warburg element in equivalent circuits. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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