On the flat-band potential and the frequency dispersion of capacitance and its removal in an n-cadmium telluride in alkaline selenide, polyselenide photoelectrochemical cell

Lyons L.E. and Young T.L. (1985) On the flat-band potential and the frequency dispersion of capacitance and its removal in an n-cadmium telluride in alkaline selenide, polyselenide photoelectrochemical cell. Australian Journal of Chemistry, 39 2: 347-356. doi:10.1071/CH9860347


Author Lyons L.E.
Young T.L.
Title On the flat-band potential and the frequency dispersion of capacitance and its removal in an n-cadmium telluride in alkaline selenide, polyselenide photoelectrochemical cell
Journal name Australian Journal of Chemistry   Check publisher's open access policy
ISSN 1445-0038
Publication date 1985-01-01
Sub-type Article (original research)
DOI 10.1071/CH9860347
Volume 39
Issue 2
Start page 347
End page 356
Total pages 10
Subject 1600 Chemistry
Abstract When seepage of the electrolyte between the semiconductor crystal and its insulation was prevented, the equivalent series capacitance Cs of an n-CdTeƖSe1-, Sen 2-, OH-ƖPt cell was almost independent of frequency (<2% increase of Cs per decade decrease of frequency) in the range 104-2 Hz. Attributing Cs wholly to the space-charge capacitance resulted in a linear Mott-Schottky plot and this yielded a fiat-band potential of -2•0 ± 0•1 V v. s.c.e. and a built-in potential of 1•08 ± 0•06 V. This was consistent with the observed current-voltage curves in both dark and light. Two conditions under which frequency dispersion was observed were (a) electrolyte seepage and (b) surface damage. The insulating techniques which allowed seepage were similar to those of other workers. The effects of these imperfections on the Mott-Schottky plot are considered. Attempts to extract useful information from frequency dispersion data showed that it is difficult or impossible to obtain an unambiguous equivalent circuit solely on the basis of goodness-of-fit of calculated to observed impedances. The ambiguity can be removed only when sufficient information beyond impedance-frequency data is available. For electrodes with seepage, a model due to Tomkiewicz led to the correct value of the built-in potential.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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