A mechanistic study of anodic formation of porous InP
| dc.contributor.author | O'Dwyer, Colm | |
| dc.contributor.author | Buckley, D. Noel | |
| dc.contributor.author | Sutton, David | |
| dc.contributor.author | Newcomb, Simon B. | |
| dc.contributor.author | Serantoni, M. | |
| dc.date.accessioned | 2013-03-04T16:57:31Z | |
| dc.date.available | 2013-03-04T16:57:31Z | |
| dc.date.copyright | 2003 | |
| dc.date.issued | 2003-01 | |
| dc.date.updated | 2012-11-30T12:10:48Z | |
| dc.description.abstract | When porous InP is anodically formed in KOH electrolytes, a thin layer ~40 nm in thickness, close to the surface, appears to be unmodified. We have investigated the earlier stages of the anodic formation of porous InP in 5 mol dm-3 KOH. TEM clearly shows individual porous domains which appear triangular in cross-section and square in plan view. The crosssections also show that the domains are separated from the surface by a ~40 nm thick, dense InP layer. It is concluded that the porous domains have a square-based pyramidal shape and that each one develops from an individual surface pit which forms a channel through this near-surface layer. We suggest that the pyramidal structure arises as a result of preferential pore propagation along the <100> directions. AFM measurements show that the density of surface pits increases with time. Each of these pits acts as a source for a pyramidal porous domain, and these domains eventually form a continuous porous layer. This implies that the development of porous domains beneath the surface is also progressive in nature. Evidence for this was seen in plan view TEM images. Merging of domains continues to occur at potentials more anodic than the peak potential, where the current is observed to decrease. When the domains grow, the current density increases correspondingly. Eventually, domains meet, the interface between the porous and bulk InP becomes relatively flat and its total effective surface area decreases resulting in a decrease in the current density. Quantitative models of this process are being developed. | en |
| dc.description.status | Peer reviewed | en |
| dc.description.uri | http://www.electrochem.org/dl/pv/published/2003/2003.htm#203pub | en |
| dc.description.version | Submitted Version | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.citation | O’ Dwyer, C., Buckley, D. N., Sutton, D., Newcomb, S. B., Seratoni, M. (2003) 'A Mechanistic Study of Anodic Formation of Porous InP’, 203rd Meeting of the Electrochemical Society: InP Electrochemistry. Palais des Congres de Paris, Paris, France, 27 April – 2 May. Pennington, NJ: The Electrochemical Society, 4, pp. 63-72. | en |
| dc.identifier.endpage | 72 | en |
| dc.identifier.isbn | 1-56677-349-0 | |
| dc.identifier.journaltitle | Proc. Electrochem. Soc. | en |
| dc.identifier.startpage | 63 | en |
| dc.identifier.uri | https://hdl.handle.net/10468/1012 | |
| dc.identifier.volume | 4 | en |
| dc.language.iso | en | en |
| dc.publisher | The Electrochemical Society | en |
| dc.relation.ispartof | 203rd Meeting of the Electrochemical Society Conference, Palais des Congres de Paris, 27 April – 2 May, 2003. | |
| dc.rights | © The Electrochemical Society, Inc. 2003. 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 O’ Dwyer, C., Buckley, D. N., Sutton, D., Newcomb, S. B., Seratoni, M. (2003) 'A Mechanistic Study of Anodic Formation of Porous InP’, 203rd Meeting of the Electrochemical Society: InP Electrochemistry. Palais des Congres de Paris, Paris, France, 27 April – 2 May. Pennington, NJ: The Electrochemical Society, 4, pp. 63-72. | en |
| dc.subject | Porous InP | en |
| dc.subject | KOH electrolytes | en |
| dc.subject | Anodic formation | en |
| dc.subject | AFM measurement | en |
| dc.subject | TEM image | en |
| dc.title | A mechanistic study of anodic formation of porous InP | en |
| dc.type | Conference item | en |
