Abstract
Cuprous oxide films on copper prepared by the rapid oxidation of copper metal foil have been found to contain a steep gradient of copper vacancies which can be redistributed by subsequent annealing in oxygen free argon. The emission and excitation spectra of the copper and oxygen vacancies have been measured at 25 K temperature intervals between 77 and 300 K for films that were annealed and quenched from five temperatures between 300° and 700°C. Annealing selectively removed oxygen vacancies allowing the clear separation, for the first time, of oxygen and copper vacancy excitation bands. Copper vacancy emission can be excited in oxygen vacancy bands over a limited low temperature range demonstrating energy transfer and suggesting a physical association. There appears to be a physical interaction between copper vacancies which may be the source of the weakly trapped holes responsible for room temperature conductivity.
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