Abstract
A photoconductive signal has been observed in ZnO single crystals at 300°K upon illumination with the 6935-Å laser light from a ruby rod. With a dark current of 2 mA, a typical peak increase in current was 7 μA. Green luminescence (centered at 5250 Å) excited by the laser light was also detected. The fluorescent intensity showed an approximately second-power dependence on incident intensity at lower intensities. At higher intensities an approximately fourth-power dependence was noted. A plausible model is given to account for the second- and fourth-power dependencies in terms of a two-photon absorption mechanism. Since the absorption coefficient of ZnO for light of wavelength 6935 Å is quite small, the observed photoconductivity and luminescence are very likely associated with the bulk rather than with the surface.
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