Abstract
FROM early experiments on the photo-conductivity of zinc-blende, Gudden and Pohl1 deduced that the current must be transported by two kinds of carrier, and according to present-day theory these must be electrons and positive holes—vacant places left in a normally full electron energy band when an electron is ejected. While electrons are liberated by blue light, positive holes do not become mobile until a subsequent illumination by light of longer wave-length, for example red or infra-red, but the reason for this need not be discussed here.
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References
Gudden, B., “Lichtelektrische Erscheinungen” (Springer, 1928).
Antonow-Romanowsky, W. W., Sow. Phys., 7, 366 (1935).
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REIMANN, A. Photo-conductivity and Phosphorescence of Zinc-blende. Nature 140, 501–502 (1937). https://doi.org/10.1038/140501b0
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DOI: https://doi.org/10.1038/140501b0
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