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

概要

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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^<13>Ω cm. Specimens with surfaces parallel to C-plane about 7×5×1 mm^3 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 (0001^^-) surface. From the results of the measurement of the thermally stimulated current curves, it was found that shallow electron traps were predominant in (0001^^-) 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.
社団法人応用物理学会の論文
1968-06-05