Exciton photoluminescence from ZnO layers produced by laser-induced gas breakdown processing
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The plasma of optically-excited gas breakdown has been used to treat a Zn target in atmospheric pressure gases (air, O2, N2, Ar). The breakdown is produced near the target by a pulsed CO2 laser radiation, yielding to a local erosion of the target under the irradiation spot and the formation of a porous nanostructured layer, consisting of ZnO nanoscale spheres. We show that the produced nanostructured layers exhibit an intense exciton emission band in the ultraviolet range (380–385 nm), while defect-related photoluminescent bands were weak and could be completely removed by varying the fabrication parameters. Properties of the produced layers were found to be very promising for the development of optoelectronic devices.
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