Simultaneous observation of current oscillations and porous film growth during anodization of InP

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Simultaneous observation of current oscillations and porous film growth during anodization of InP

O'Dwyer, Colm; Buckley, D. Noel; Newcomb, Simon B.
Date: 2005-08-05
Copyright: © 2005 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/la050936r
Citation: O'Dwyer, C., Buckley, D. N., Newcomb, S. B. (2005) 'Simultaneous observation of current oscillations and porous film growth during anodization of InP', Langmuir, 21(18), pp. pp 8090–8095. http://dx.doi.org/10.1021/la050936r
Published Version: 10.1021/la050936r

Abstract:

The observation of spontaneous oscillations in current during the anodization of InP in relatively high concentrations of KOH electrolytes is reported. Oscillations were observed under potential sweep and constant potential conditions. Well-defined oscillations are observed during linear potential sweeps of InP in 5 mol dm-3 KOH to potentials above ∼1.7 V (SCE) at scan rates in the range of 50 to 500 mV s-1. The oscillations observed exhibit an asymmetrical current versus potential profile, and the charge per cycle was found to increase linearly with potential. More complex oscillatory behavior was observed under constant potential conditions. Periodic damped oscillations are observed in high concentrations of electrolyte whereas undamped sinusoidal oscillations are observed in relatively lower concentrations. In both cases, the anodization of InP results in porous InP formation, and the current in the oscillatory region corresponds to the cyclical effective area changes due to pitting dissolution of the InP surface with the coincidental growth of a thick porous In2O3 film.

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