Persistent photoconductivity quenching effect crystals and elect

Details Persistent photoconductivity quenching effect crystals and elect Persistent photoconductivity quenching effect crystals and elect

1990-10-15

1992-03-31

Larkins, William D.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

357 61, 357 30, H01L 310296

Patent

active

051011093

ABSTRACT:
Mixed II-VI crystal semiconductors (10) having the general formula Zn.sub.x Cd.sub.1-x Se, where x is up to about 0.4, are provided which exhibit persistent photoconductivity (PPC) above 70.degree. K. which is quencable by infrared radiation. An electrical apparatus (12) utilizing the crystal (10) of the invention is further provided. The apparatus (12) preferably includes a pair of electrical terminals (14, 16) coupled to the crystal (10), circuit-defining structure (18) connecting the terminal (14, 16) coupled with a power source (19) and a current responsive device (20) being in series with the crystal (10). Action of visible light on the crystal (10) induces PPC, completing an electrical circuit and initiating current flow. Incident infrared light on the crystal (10) quenches PPC and decreases current flow.

REFERENCES:
patent: 3218203 (1965-11-01), Ruehrwein
patent: 3309553 (1967-03-01), Kroemer
patent: 3390090 (1968-06-01), Taylor et al.
patent: 3716406 (1973-02-01), Scholl et al.
patent: 3918971 (1975-11-01), Zweig

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