Ultraviolet-light photodiode

Details Ultraviolet-light photodiode Ultraviolet-light photodiode

1990-02-22

1992-07-14

James, Andrew J.

357 32, 357 48, 357 88, 357 90, H01L 2714, H01L 3100, H01L 2704

Patent

active

051307766

ABSTRACT:
An ultraviolet-light sensitive photodiode device comprises a first semiconductor photodiode for producing a first current when illuminated by light and a second semiconductor photodiode for producing a second current when illuminated by light. The first and second photodiodes are electrically connected to produce a signal proportional to the difference between the first and second currents. The first and second photodiodes are substantially equal in sensitivity to visible and infrared light, while the first photodiode is more sensitive to ultraviolet light than the second photodiode. Thus, the photosensitive device resulting from connecting the two photodiodes has a spectrally narrow sensitivity to ultraviolet light.

REFERENCES:
patent: 4704024 (1987-11-01), Tsunekawa
patent: 4746804 (1988-05-01), Kitamura et al.
patent: 4831430 (1989-05-01), Umeji
N. Kako et al., Sensors and Actuators, 4 (1983), pp. 655-660, "Combustion Detection With a Semiconductor Color Sensor".

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