Electrochemical formation of nanoporosity in n-InP anodes in KOH
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Date
2011-01
Authors
Buckley, D. Noel
O'Dwyer, Colm
Lynch, Robert P.
Quill, Nathan
Journal Title
Journal ISSN
Volume Title
Publisher
The Electrochemical Society
Published Version
Abstract
We review our recent work on anodic formation of nanoporosity in
n-InP in aqueous KOH. Typically, a nanoporous sub-surface
region is formed beneath a thin, dense near-surface layer. Atomic
force microscopy (AFM) shows pit formation on the surface in the
earlier stages of etching, and transmission electron microscopy
(TEM) shows individual nanoporous domains separated from the
surface by a thin InP layer. Each domain develops from a surface
pit. We developed a model based on propagation of pores along the
<111>A directions. The model predicts porous domains with a
truncated tetrahedral shape and this was confirmed by scanning
electron microscopy (SEM) and TEM. Pores are cylindrical and
have well-developed facets only near their tips. No porous layers
are observed at a KOH concentration of 1.1 mol dm -2 or lower.
Linear sweep voltammograms (LSVs) show a pronounced anodic
peak corresponding to the formation of the porous region. We
describe a technique to deconvolute the effects of potential and
time in LSVs and explain their shape and their relationship to
porous layer formation.
Description
Keywords
Nanoporosity , Atomic force microscopy (AFM) , Transmission electron microscopy (TEM) , Scanning electron microscopy (SEM) , Linear sweep voltammogram (LSV)
Citation
Buckley, D. N.,O'Dwyer, C.,Lynch, R. P.,Quill, N. (2011) 'Electrochemical Formation of Nanoporosity in n-InP Anodes in KOH'. ECS Trans, 35(8), pp.29-48. doi: 10.1149/1.3567735
Copyright
© The Electrochemical Society, Inc. 2011. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Buckley, D. N.,O'Dwyer, C.,Lynch, R. P.,Quill, N. (2011) 'Electrochemical Formation of Nanoporosity in n-InP Anodes in KOH'. ECS Trans, 35(8), pp.29-48. doi: 10.1149/1.3567735