Photoemitter

Details Photoemitter Photoemitter

1975-05-20

1978-08-15

Segal, Robert

Electric lamp and discharge devices

Geiger-mueller type

313385, H01J 3900, H01J 3906

Patent

active

041075641

ABSTRACT:
A photoemitter sensitive in the optical range of wavelengths comprises, according to the invention, a substrate made from p-type semiconductor materials of a group of chemical compounds A.sup.II B.sup.IV C.sub.2.sup.V, where A.sup.II are elements belonging to the second subgroup of group II: zinc and cadmium, B.sup.IV are elements belonging to the second subgroup of group IV: germanium, silicon and tin, C.sub.2.sup.V are elements belonging to the second subgroup of group V: phosphorus and arsenic, and a coating of cesium and oxygen. Homogeneity of the bulk and surface properties of the emitter substrate provides high sensitivity in the near-threshold region of photosensitivity corresponding to the width of the forbidden band of the photoemitter substrate.

REFERENCES:
patent: 3140998 (1964-07-01), Folberth
patent: 3259582 (1966-07-01), Folberth
patent: 3631303 (1971-12-01), Antypas et al.
patent: 3687743 (1972-08-01), Le Duc
patent: 3806372 (1974-04-01), Sommer

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