The roles of cesium ions in regulating photoinduced interfacial charge transfer at the n-type cadmium chalcogenide/ferrocyanide interface

Douglas J. Arent, Carmela Hidalgo-Luangdilok, Jonathan K.M. Chun, Andrew Bruce Bocarsly, Robert E. Woods

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Addition of Cs+ ions to electrolytes utilized with n-type cadmium chalcogenide photoanodes has previously been reported to have major effects on the stability and in some cases the electrochemical output parameters of such cells. The observed behavior has been attributed both to chemical effects occurring in the electrolyte and to semiconductor surface modification based on the adsorption of Cs+ ions. The present study evaluates the effects of Cs+ on n-CdX/ferri-ferrocyanide (X= S, Se) photo- electrochemical cells. Two effects are observed: the intercalation of Cs+ into [CdFe(CN)6] 2- 1- overlayers which are intrinsic to the semiconductor surface, and the specific chemisorption of Cs+ onto CdSe surfaces. The former effect is found to reorganize the overlayer microstructure allowing for enhanced interfacial charge transport, while the latter process leads to unfavorable heterogeneous charge-transfer kinetics.

Original languageEnglish (US)
Pages (from-to)295-310
Number of pages16
JournalJournal of Electroanalytical Chemistry
Volume328
Issue number1-2
DOIs
StatePublished - Jul 1 1992

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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