Journal
ELECTROCHIMICA ACTA
Volume 112, Issue -, Pages 976-982Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.04.167
Keywords
Zinc oxide; Transparent conductive oxide; Surface texture; Anodic dissolution; Electrolyte
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The electrochemical anodic dissolution of sputter-deposited, aluminum-doped zinc oxide (ZnO:Al) was investigated. The dissolution proceeds mainly via a local oxygen evolution reaction and subsequent dissolution of the zinc oxide lattice. The present work focuses on the influence of the anion species in the used electrolyte. Several electrolytes (KCl, K2SO4, KNO3, KClO4) were applied. The anion species turned out to be a major factor that influenced the kinetics of the etching process. In K2SO4 solutions a strong limitation of the etching process to the close vicinity of the grain boundaries was observed. However, anodic dissolution in KCl, KNO3, and KClO4 showed an unexpected etching behavior, which lead to the formation of cavern-like structures within the ZnO:Al thin films. This was attributed to different local pH values at the ZnO:Al/electrolyte interface. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
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