Strain-compensated infrared photodetector and photodetector array
First Claim
1. A photodetector, comprising:
- a semiconductor substrate;
a plurality of III-V compound semiconductor layers epitaxially grown on the semiconductor substrate including;
a plurality of indium arsenide antimonide (InAsSb) light-absorbing layers located above the semiconductor substrate;
a plurality of tensile-strained layers interspersed between the plurality of InAsSb light-absorbing layers, the plurality of tensile-strained layers comprising layers of indium arsenide (InAs) or indium gallium arsenide (InGaAs);
a barrier layer located above the plurality of InAsSb light-absorbing layers;
an contact layer located above the barrier layer;
a first electrode electrically connected to the plurality of InAsSb light-absorbing layers; and
a second electrode electrically connected to the contact layer.
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Accused Products
Abstract
A photodetector is disclosed for the detection of infrared light with a long cutoff wavelength in the range of about 4.5-10 microns. The photodetector, which can be formed on a semiconductor substrate as an nBn device, has a light absorbing region which includes InAsSb light-absorbing layers and tensile-strained layers interspersed between the InAsSb light-absorbing layers. The tensile-strained layers can be formed from GaAs, InAs, InGaAs or a combination of these III-V compound semiconductor materials. A barrier layer in the photodetector can be formed from AlAsSb or AlGaAsSb; and a contact layer in the photodetector can be formed from InAs, GaSb or InAsSb. The photodetector is useful as an individual device, or to form a focal plane array.
30 Citations
40 Claims
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1. A photodetector, comprising:
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a semiconductor substrate; a plurality of III-V compound semiconductor layers epitaxially grown on the semiconductor substrate including; a plurality of indium arsenide antimonide (InAsSb) light-absorbing layers located above the semiconductor substrate; a plurality of tensile-strained layers interspersed between the plurality of InAsSb light-absorbing layers, the plurality of tensile-strained layers comprising layers of indium arsenide (InAs) or indium gallium arsenide (InGaAs); a barrier layer located above the plurality of InAsSb light-absorbing layers; an contact layer located above the barrier layer; a first electrode electrically connected to the plurality of InAsSb light-absorbing layers; and a second electrode electrically connected to the contact layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A photodetector, comprising:
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a semiconductor substrate; a light-absorbing region located above the semiconductor substrate, with the light-absorbing region comprising a plurality of layers of indium arsenide antimonide (InAsSb), gallium arsenide (GaAs) and indium arsenide (InAs); a barrier layer located above the light-absorbing region; a contact layer located above the barrier layer; a first electrode electrically connected to the light-absorbing region; and a second electrode electrically connected to the contact layer. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A photodetector, comprising:
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a semiconductor substrate; a light-absorbing region located above the semiconductor substrate, with the light-absorbing region comprising a plurality of alternating layers of indium arsenide antimonide (InAsSb) and indium gallium arsenide (InGaAs); a barrier layer located above the light-absorbing region; a contact layer located above the barrier layer; a first electrode electrically connected to the light-absorbing region; and a second electrode electrically connected to the contact layer. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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Specification