Luminescent Tellurium-Doped Cadmium Sulfide Electrodes as Probes of Semiconductor Excited-State Deactivation Processes in Photoelectrochemical Cells.
WISCONSIN UNIV-MADISON DEPT OF CHEMISTRY
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Correlations between quantum efficiencies for photocurrent phi x, emission phi r, and nonradiative recombination phi nr are discussed with reference to data from single-crystal, n-type, 100 and 1000 ppm CdSTe-based photoelectrochemical cells PECs employing aqueous sulfide electrolyte. These materials emit while they serve as PEC electrodes. The assumption that the proportionality of phi r to phi nr is unaffected by potential leads to a simple expression relating phi x to phi r for monochromatic excitation. Calculated and observed emission data are in reasonable agreement sources of deviation are discussed. Polychromatic excitation is shown to yield photocurrent and emission intensity which is approximately a weighted average of the values obtained with the constituent monochromatic frequencies. Practical implications of the phi x correlation with phi r are described, as are related results from other PECs. Author
- Physical Chemistry