Infrared detector and method of making the infrared detector
First Claim
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1. An infrared detector for detecting absorbed infrared rays by converting the infrared rays into heat, comprising:
- a semiconductor substrate having a surface and a heat insulation section at the surface;
a heat detection section located in the heat insulation section;
an infrared ray absorption film disposed substantially parallel to the surface of the semiconductor substrate; and
an infrared ray reflection film supported by the semiconductor substrate and located on opposite sides of the heat detection section, wherein infrared rays transmitted through the infrared ray absorption film are reflected by the infrared ray reflection film into the infrared ray absorption film.
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Abstract
An infrared detector includes an optical cavity structure with an infrared reflection film on a semiconductor substrate. The infrared reflection film and an infrared absorption film provide high efficiency infrared detection.
45 Citations
20 Claims
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1. An infrared detector for detecting absorbed infrared rays by converting the infrared rays into heat, comprising:
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a semiconductor substrate having a surface and a heat insulation section at the surface;
a heat detection section located in the heat insulation section;
an infrared ray absorption film disposed substantially parallel to the surface of the semiconductor substrate; and
an infrared ray reflection film supported by the semiconductor substrate and located on opposite sides of the heat detection section, wherein infrared rays transmitted through the infrared ray absorption film are reflected by the infrared ray reflection film into the infrared ray absorption film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of producing an infrared detector for detecting absorbed infrared rays by converting the infrared rays into heat, comprising:
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forming a wiring layer and a heat detection section connected to the wiring layer and supported by a semiconductor substrate;
covering the wiring layer and the heat detection section with an insulating film;
forming an infrared ray reflection film on the insulating film;
forming a sacrificial film on the infrared ray reflection film, and forming an opening in the sacrificial film opposite the heat detection section;
forming, over the sacrificial film and in the opening, an infrared ray absorption section including an infrared ray absorption film;
removing the sacrificial film; and
forming, opposite the heat detection section, in the semiconductor substrate, a hollow section by etching the semiconductor substrate. - View Dependent Claims (13, 15)
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14. A method of producing an infrared detector for detecting absorbed infrared rays by converting the infrared rays into heat, comprising:
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forming a metal layer supported by a semiconductor substrate, and forming a wiring layer and an infrared ray reflection film separated from the wiring layer by patterning the metal layer;
forming a heat detection section connected to the wiring layer, and covering the heat detection section with an insulating film;
forming a sacrificial film on the infrared ray reflection film, and forming an opening in the sacrificial film opposite the insulating film, thereby exposing the insulating film;
forming, on the sacrificial film and in the opening, an infrared ray absorption section including an infrared ray absorption film;
removing the sacrificial film; and
forming, opposite the heat detection section, in the semiconductor substrate, a hollow section by etching the semiconductor substrate. - View Dependent Claims (16)
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17. An infrared detector for detecting absorbed infrared rays by converting the infrared rays into heat, comprising:
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a semiconductor substrate having a surface and a hollow section at the surface;
a heat detection section opposite the hollow section;
an infrared ray reflection film supported by the semiconductor substrate;
a support section at the heat detection section and extending away from the semiconductor substrate;
an infrared ray absorption film supported by the support section and spaced from the infrared ray reflection film; and
an air layer between the infrared ray absorption film and the infrared ray reflection film so that infrared rays transmitted through the infrared ray absorption film are reflected by the infrared ray reflection film into the infrared ray absorption film through the air layer. - View Dependent Claims (18, 19, 20)
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Specification