Comparison of oscillatory behavior on InP electrodes in KOH solutions

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O'Dwyer, Colm
Melly, T.
Harvey, E.
Buckley, D. Noel
Cunnane, V. J.
Sutton, David
Newcomb, Simon B.
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The observation of current oscillations under potential sweep conditions when an n-InP electrode is anodized in a KOH electrolyte is reported and compared to the oscillatory behavior noted during anodization in an (NH4)2S electrolyte. In both cases oscillations are observed above 1.7 V (SCE). The charge per cycle was found to increase linearly with potential for the InP/KOH system but was observed to be independent of potential for the InP/(NH4)2S system. The period of the oscillations in the InP/KOH was found to increase with applied potential. In this case the oscillations are asymmetrical and the rising and falling segments have a different dependence on potential. Although the exact mechanism is not yet know for either system, transmission electron microscopy studies show that in both cases, the electrode is covered by a thick porous film in the oscillatory region.
KOH electrolyte , Transmission electron microscopy , Porous film
O' Dwyer, C., Melly, T., Harvey, E., Buckley, D. N., Cunnane, V. J., Sutton, D and Newcomb, S. B. (2002) ' Comparison of Oscillatory Behavior on InP Electrodes in KOH Solutions ', State-of-the-Art Program on Compound Semiconductors XXXVII (SOTAPOCS XXXVII) / Narrow Bandgap Optoelectronic Materials and Devices, 202nd ECS Meeting, Salt Lake City, Utah, 20-24 October, in Proceedings - Electrochemical Society, Vol. 14, pp. 275-285. ISBN 1-56677-306-5.
© 2002, Electrochemical Society