Effect of Self-Purification and Polarity on Surface Photoconductivity of CdS Crystals

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<jats:p>It was possible to grow pure CdS crystals, which displayed only the intrinsic photoconduction, by sublimation in which sublimating CdS vapor worked as a trap to remove impurities. CdS crystals without intentionally added impurities thus obtained had a wide range of specific resistivity from 10 to 10<jats:sup>13</jats:sup>\varOmega cm. Specimens with surfaces parallel to C-plane about 7×5×1 mm<jats:sup>3</jats:sup>in size were sliced off a single crystal boule having various resistivities, of which dark resistivities, spectral distribution of photocurrent and thermally stimulated current were studied on both (0001) and (0001̄) surface. From the results of the measurement of the thermally stimulated current curves, it was found that shallow electron traps were predominant in (0001̄) surface, whereas deep electron traps were predominant in (0001) surface. In the case of dark resistivity and spectral distribution of photoconductivity, the experimental results are shown as a tendency in which the local segregations were more effective on these properties, compared with the influences of polarity on them.</jats:p>

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