Photo transistor

Details Photo transistor Photo transistor

1984-04-10

1985-06-18

James, Andrew J.

357 34, 357 59, 357 86, 357 53, H01L 2714, H01L 3100, H01L 2972, H01L 2904

Patent

active

045243751

ABSTRACT:
Photo transistor, including a semiconductor body having a surface, a region placed on the surface of the body being intended for light exposure having an edge and a remainder of the region, a collector zone placed in the body and having at least a part thereof emerging to the surface of the body, a base zone being embedded in a planar manner in the collector zone and having at least a part thereof emerging to the surface of the body, an emitter zone being embedded in a planar manner in the base zone, an emitter electrode disposed on the emitter zone, an insulating layer covering the region intended for exposure, an auxiliary zone being embedded in the surface of the body and having a conductivity type being opposite to that of the collector zone, an auxiliary electrode being placed on the insulating layer and overlapping at least the part of the base zone emerging to the surface and the auxiliary zone and covering the part of the collector zone emerging to the surface, the insulating layer having a relatively thicker part and a relatively thinner part both being placed under the auxiliary electrode, the thicker part being placed over the edge of the region intended for exposure and overlapping the auxiliary zone and the thinner part being placed over the remainder of the region intended for exposure.

REFERENCES:
patent: 3204160 (1965-08-01), Sah
patent: 3518494 (1970-06-01), James
patent: 3663869 (1972-05-01), Strull
patent: 4107721 (1978-08-01), Miller
patent: 4223330 (1980-09-01), Koike et al.
patent: 4315271 (1982-02-01), Roger
patent: 4318115 (1982-03-01), Yoshikawa et al.
patent: 4321486 (1982-03-01), Boler et al.
patent: 4343014 (1982-08-01), Jaecklin
patent: 4355320 (1982-10-01), Tihanyi

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