Ultraviolet-light photodiode
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United States of America Patent
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Jul 14, 1992
Grant Date -
N/A
app pub date -
Feb 22, 1990
filing date -
Mar 16, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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