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Tunneling Relaxation of Photocurrent from Passive Films on Stainless Steel

Authors :
T.L. Sudesh L. Wijesinghe
Daniel John Blackwood
Source :
Journal of The Electrochemical Society. 153:B178
Publication Year :
2006
Publisher :
The Electrochemical Society, 2006.

Abstract

The photocurrent transient effects of passive films grown on austenitic stainless steels in borate solutions have been investigated and explained by extending a mid-bandgap states model that was previously developed for titanium oxide. Tunneling of electrons trapped in mid-bandgap states into the conduction band was proposed as the reason behind the slow relaxation of photocurrent once the light is turned off. In addition, it was found that surface recombination effects started to appear at potentials where Cr(III) is expected to occur in the passive film, supporting earlier suggestions that this species can act as recombination centers.

Details

ISSN :
00134651
Volume :
153
Database :
OpenAIRE
Journal :
Journal of The Electrochemical Society
Accession number :
edsair.doi...........973e72c346a99f10636006afde08bdce
Full Text :
https://doi.org/10.1149/1.2186035