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Photoelectrochemical studies of passivating films on tin in slightly alkaline solutions

✍ Scribed by Sergio Kapusta; Norman Hackerman

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
537 KB
Volume
25
Category
Article
ISSN
0013-4686

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✦ Synopsis

The photoresponse ofpassivatingfilms grown on tin in slightly alkalinesolutions has beenstudied under both galvanostatic and potentiostatic conditions. The response of films growing under galvanostatic conditions was used to determine the nature and magnitude of their deviation from stoichiometry, as a function of potential. The photoresponse of films formed at potentials between 0.5 and 1.6 V can he described by Gartner's theory of depletion layer photoeffects. For thicker nlms the presence of localized levels acting as trapsis postulated to explain the slow response and potential dependence of the photocurrents.

The spectral response is independent of film thickness. Under sub-bandgap illumination indirect transitions with an absorption edge of 2.55eV are predominant.

No evidence of impurity band transitions was found.

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