Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1989-12-20
1991-07-30
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
25037013, 250339, H01L 4902
Patent
active
050362038
ABSTRACT:
An infrared detector array which is simultaneously responsive to two different portions of the infrared spectrum is disclosed. The array has detector elements formed upon the two opposite planar surfaces of a substrate. The detector elements formed upon the first surface of the substrate are responsive to a first portion of the infrared spectrum and the detector elements formed upon the second surface of the substrate are responsive to a second portion of the infrared spectrum. An intermediate layer of single crystalline material can be formed upon one or both surfaces of the substrate between the substrate and the dector elements. This intermediate layer of single crystalline material filters infrared radiation not within the second portion of the infrared spectrum to reduce the amount of infraed radiation not within the second portion of the infrared spectrum which is incident upon the detector elements formed upon the second surface of the substrate. The detector elements formed upon the first surface of the detector array may be specifically formed to be more responsive to infrared radiation within the first portion of the infrared spectrum than to infrared radiation within the second portion of the infrared spectrum. A second embodiment is disclosed wherein an array of non-single crystalline inerference filters is formed upon one surface of the substrate and a single crystalline detector is then grown graphotaxially through a small hole in each non-single crystalline interference filter.
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Beyer James E.
Fields Carolyn E.
Grumman Aerospace Corporation
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