Zinc selenide photoelectrodes. Efficient radiative recombination in a stable photoelectrochemical cell. Technical report

Technical Report · Fri May 25 04:00:00 EDT 1984

OSTI ID:6566067

Smiley, P M; Biagioni, R N; Ellis, A B

Photoluminescence (PL) and electroluminescence (EL) from single-crystal, n-type, A1-doped ZnSe (ZnSe:A1) electrodes have been studied. These samples exhibit both edge emission (lambda(max) approx. 460 nm) and subband gap emission when excited at several ultraband gap wavelengths. The latter PL band is particularly intense, with a measured radiative quantum yield of approx. 0.1 to 0.01; the transition seems at least partially self-activated (SA) in origin, based on previously reported PL data. Excited-state communication involving the two emissive states is inferred from time-resolved PL measurements. Stable photoelectrochemical cells (PEC's) can be constructed from n-ZnSe:A1 electrodes and aqueous diselenide or ditelluride electrolytes. Applied potential quenches both of the photoanodes' PL bands roughly in parallel. The extent of PL quenching is consistent with a dead-layer model previously used to describe quenching in Au-ZnSe Schottky diodes. When used as a dark cathode in aqueous, alkaline peroxydisulfate eletrolyte, EL from ZnSe:A1 electrodes is observed.

• Research Organization: Wisconsin Univ., Madison (USA). Dept. of Chemistry
• OSTI ID: 6566067
• Report Number(s): AD-A-141869/8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
CATHODES
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTROLUMINESCENCE
ELECTROLYTES
EMISSION
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
EXCITATION
FLUIDS
LAYERS
LIQUIDS
LUMINESCENCE
PHOTOCHEMICAL REACTIONS
PHOTOELECTROCHEMICAL CELLS
PHOTOLUMINESCENCE
QUENCHING
SELENIDES
SELENIUM COMPOUNDS
SOLAR EQUIPMENT
STABILITY
ZINC COMPOUNDS
ZINC SELENIDES