Electric lamp and discharge devices – Cathode ray tube – Image pickup tube
Patent
1986-11-24
1988-06-14
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Image pickup tube
357 3, 357 30, H01J 3126, H01J 4006
Patent
active
047514230
ABSTRACT:
A photocathode having a low dark current comprises a first layer consisting of P.sup.+ type semiconductor material which is transparent to all wavelengths of the light to be detected, a second layer consisting of P.sup.+ type semiconductor in which the forbidden band is of sufficiently small width to convert the photons of the light to be detected into electron-hole pairs, at least one intercalary layer located within the second layer and consisting of P-type or N-type semiconductor material for creating a potential barrier with respect to the second layer, the thickness of said intercalary layer being of sufficiently low value to permit the passage of electrons by tunnel effect with high probability but of sufficiently high value to stop the greater part of a hole current, a metallic electrode for biasing the photocathode in order to accelerate the electrons of the electron-hole pairs created within the second layer by the light, a last layer for reducing the energy-gap potential with respect to the second layer in order to emit into the vacuum the electrons which have thus been accelerated.
REFERENCES:
patent: 3743899 (1973-07-01), Anthony et al.
patent: 3958143 (1976-05-01), Bell
patent: 4015284 (1977-03-01), Hara et al.
patent: 4587456 (1986-05-01), Inoue et al.
IEEE Electron Device Letters, vol. EDL-2, No. 5 mai 1981, pp. 123-125.
de Groot Paul
Henry Yves
Munter Bernard
Weisbuch Claude
Moore David K.
Thomson - CSF
Wieder K.
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