Luminescent Photoelectrochemical Cells. 6. Spatial Aspects of the Photoluminescence and Electroluminescence of Cadmium Selenide Electrodes.
Abstract
The study of interfacial charge-transfer processes at semiconductor electrodes is under active investigation, as befits the semiconductor's role as the key element of photoelectrochemical cells (PECs). We have recently reported the use of luminescence as a tool for examining charge-transfer events occurring at n-type CdS and CdS:Te (Te-doped CdS) electrodes. Photoluminescence was studied while these electrodes served as photoanodes in PECs employing polychalcogenide electrolytes; under certain conditions photoluminescence could be initiated by using the semiconductors as dark cathodes in alkaline, peroxydisulfate media. Photoluminescence (PL) and electroluminescence (EL) represents two methods for populating the excited-state manifold of CdSe. PL studies, to be described first, were conducted in air and in a PEC. These experiments aid in the assignment of the emissive transition and detail its spectral distribution, efficiency, and perturbation by the passage of current in a PEC. Subsequently, we discuss the analogous EL characteristics of spectral distribution, efficiency and potential dependence. Implications of comparisons of PL and EL properties are also discussed in this section. In the final section we describe the effects of various surface treatments on the PL properties of CdSe.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 06, 1981
- Accession Number
- ADA107580
Entities
People
- Arthur B. Ellis
- Holger H. Streckert
- Jiu-ru Tong