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 language | English |
---|---|
Pages (from-to) | 1623-1628 |
Number of pages | 6 |
Journal | Journal of the Electrochemical Society |
Volume | 125 |
Issue number | 10 |
DOIs | |
State | Published - Oct 1978 |
Externally published | Yes |
Keywords
- XPS
- energy conversion
- photocorrosion
- photoelectrochemistry