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Anodic formation of nanoporous indium phosphide in KOH electrolytes: effects of temperature and concentration

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Show simple item record Quill, Nathan Buckley, Noel O’Dwyer, Colm Lynch, Robert P. 2019-01-24T10:35:04Z 2019-01-24T10:35:04Z 2019
dc.description peer-reviewed en_US
dc.description.abstract Anodization of n-InP electrodes was carried out over a range of temperatures and KOH concentrations. Scanning electron microscopy showed <111>A aligned pore growth with pore width decreasing as the temperature was increased. This variation is explained in terms of the relative rates of electrochemical reaction and hole diffusion and supports the three-step model proposed earlier. As temperature is increased, both the areal density and width of surface pits decrease resulting in a large increase in the current density through the pits. This explains an observed decrease in porous layer thickness: pits sustain mass transport at the necessary rate for a shorter time before precipitation of etch products blocks the pores. As the concentration of KOH is increased, both pore width and layer thickness decrease to minima at ∼9 mol dm−3 after which they again increase. This variation of pore width is also explained by the three-step model and the variation in layer thickness is explained by mass transport effects. Layer porosity follows a similar trend to pore width, further supporting the three-step model. A transition from porous layer formation to planar etching is observed below 2 mol dm−3 KOH, and this is also explained by the three-step model. en_US
dc.language.iso eng en_US
dc.publisher Electrochemical Society en_US
dc.relation 07/SK/B1232a en_US
dc.relation.ispartofseries Journal of The Electrochemical Society;166 (5), H3097-H3106
dc.subject anodic en_US
dc.subject nanoporous en_US
dc.subject KOH en_US
dc.subject temperature en_US
dc.subject concentration en_US
dc.title Anodic formation of nanoporous indium phosphide in KOH electrolytes: effects of temperature and concentration en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.contributor.sponsor IRC en_US
dc.contributor.sponsor Government of Ireland en_US
dc.contributor.sponsor IRC-Marie Skłodowska Curie Fellowship en_US
dc.contributor.sponsor SFI en_US
dc.contributor.sponsor National Access Program (NAP) en_US
dc.contributor.sponsor INSPIRE en_US
dc.relation.projectid INSPIRE PCOFUND-GA-2008-229520 en_US
dc.relation.projectid (37 and 70) en_US
dc.relation.projectid 07/SK/B1232a en_US
dc.relation.projectid IA/14/2581 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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