Abstract
In two previous communications1,2 the photo-conductive properties of lead sulphide layers and a new photovoltaic effect were described. The latter effect is essentially a property of the semi-conductor and is not associated with the electrodes. A theory of the effect was outlined which attributed the photo-e.m.f. to the barrier between regions of excess and defect semi-conductors. It was further postulated that, in an apparently homogeneous photoconductive layer showing no external photo-e.m.f., there existed regions distributed at random which were predominantly either excess or defect semi-conductors. The photoconductive properties of the layer were also attributed to the barriers between these regions. Experimental evidence has now been obtained to justify this assumption.
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References
Starkiewicz, J., Sosnowski, L., and Simpson, O., Nature, 158, 28 (1946).
Sosnowski, L., Starkiewicz, J., and Simpson, O., Nature, 159, 818(1947).
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SOSNOWSKI, L., SOOLE, B. & STARKIEWICZ, J. Occurrence of Random Photovoltaic Barriers in Photoconductive Layers. Nature 160, 471–472 (1947). https://doi.org/10.1038/160471a0
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DOI: https://doi.org/10.1038/160471a0
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