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The type of conductivity of pure Bi 2 O 3 layers is determined by the change of conductivity under the influence of chemisorbed oxygen. The spectral photoconductive sensitivity is measured on undoped and doped Bi 2 O 3 layers within the range of 0.8 to 3.5 eV. The time constant of the photoelectric effect of pure Bi 2 O 3 layers can be reduced by photoadsorption of oxygen. A sulfur or selenium doping of the layers causes a shift of the wavelength limit towards the near infra‐red. The time constant is greatly reduced. The doped layers are suitable for vidicon use.
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Gobrecht et al. (1969) studied this question.
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