Patent ID: 7282712

Claim:
An infrared sensor comprising: a support member including a support film made of an insulating material and a substrate that has a concavity and supports the support film; a plurality of polysilicon layers each of which has a predetermined conductivity type and extends from a location above the concavity to a location above the substrate, and each of which comprises an elongated portion having edges that extend parallel to one another in a longitudinal direction of the elongated portion, and a tapered portion located at a distal end of the elongated portion located above the concavity and being configured such that edges of the tapered portion gradually converge toward one another in a non-parallel fashion in a distal direction of the elongated portion; an insulating film which is formed on the polysilicon layers and has a first junction hole formed above the concavity and a second junction hole formed above the substrate; an aluminum wiring layer which is connected to a first one of the polysilicon layers through the first junction hole and which is connected to an adjacent one of the polysilicon layers through the second junction hole; and an infrared absorption layer formed above the concavity to cover a portion above the first junction hole, wherein the aluminum layer connected to the first polysilicon layer through the first junction hole is stacked via the insulating film as an overlying layer of the first polysilicon layer above the concavity, and wherein the tapered portion of the first polysilicon wiring layer is coupled to the elongated portion of the first polysilicon wiring layer, and a hot junction portion is formed within the elongated portion of the first polysilicon wiring layer at a location where the aluminum wiring layer is connected to the first polysilicon wiring layer through the first junction hole.