S/Se Substitution in Polycrystalline CdSe Photoelectrodes: Photoelectrochemical Energy Conversion

David Cahen, Gary Hodes, Joost Manassen

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

On the basis of x-ray photoelectron spectroscopy (XPS) studies of polycrystalline CdSe electrodes, the occurrence of S/Se substitution in these electrodes, when immersed in polysulfide solution, is. verified. The substitution process is enhanced considerably when the electrode is illuminated as part of a photoelectrochemical cell. The mechanism of the S/Se exchange is discussed, as well as the consequences of such an exchange for electrode stability. The resulting presence of a thin (several tens of angstroms) layer of CdS on top of the CdSe is taken into account in constructing a rough band scheme for the system. The CdS layer is shown to influence the photovoltage and, to a lesser extent, the photocurrent obtainable from this kind of photoelectrochemical cell. Its relation to the slow deactivation of highly crystalline CdSe photoelectrodes is discussed.

Original languageEnglish
Pages (from-to)1623-1628
Number of pages6
JournalJournal of the Electrochemical Society
Volume125
Issue number10
DOIs
StatePublished - Oct 1978
Externally publishedYes

Keywords

  • XPS
  • energy conversion
  • photocorrosion
  • photoelectrochemistry

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