Letter | Published:

Photo-conductivity and Phosphorescence of Zinc-blende

Nature volume 140, pages 501502 (18 September 1937) | Download Citation



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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  1. 1.

    , “Lichtelektrische Erscheinungen” (Springer, 1928).

  2. 2.

    , Sow. Phys., 7, 366 (1935).

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  1. Royal Society Mond Laboratory, Cambridge. August 18.

    • A. L. REIMANN


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