Piezoresistive pressure sensor
First Claim
1. A piezoresistive pressure sensor comprisinga substrate having a cavity;
- a silicon device layer attached to the substrate, the silicon device layer having a recess, the silicon device layer comprisinga diaphragm having a top surface; and
a support element having a top surface;
the top surface of the diaphragm being connected to the top surface of the support element by one or more side surfaces;
the recess of the silicon device layer being defined by the top surface of the diaphragm and the one or more side surfaces;
each of a plurality of piezoresistive regions being on the top surface of the diaphragm, extending to a respective side surface of the one or more side surfaces and further extending to the top surface of the support element; and
a plurality of conductive regions being on the top surface of the support element, the plurality of conductive regions not extending to the one or more side surfaces nor the top surface of the diaphragm;
wherein said each of the plurality of piezoresistive regions is connected to two respective conductive regions of the plurality of conductive regions;
wherein the plurality of piezoresistive regions have a first ion dosage concentration;
wherein the plurality of conductive regions have a second ion dosage concentration; and
wherein the second ion dosage concentration is greater than the first ion dosage concentration.
1 Assignment
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Accused Products
Abstract
A piezoresistive pressure sensor includes a substrate and a silicon device layer. The substrate has a cavity. The silicon device layer includes a diaphragm and a support element. A top surface of the diaphragm is connected to a top surface of the support element by one or more side surfaces. A recess of the silicon device layer is defined by the top surface of the diaphragm and the one or more side surfaces. A plurality of piezoresistive regions are on the top surface of the diaphragm, on the one or more side surfaces and on the top surface of the support element. A plurality of conductive regions are on the top surface of the support element. The plurality of conductive regions do not extend to the top surface of the diaphragm. The plurality of piezoresistive regions have a first ion dosage concentration. The plurality of conductive regions have a second ion dosage concentration. The second ion dosage concentration is greater than the first ion dosage concentration.
6 Citations
19 Claims
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1. A piezoresistive pressure sensor comprising
a substrate having a cavity; -
a silicon device layer attached to the substrate, the silicon device layer having a recess, the silicon device layer comprising a diaphragm having a top surface; and a support element having a top surface; the top surface of the diaphragm being connected to the top surface of the support element by one or more side surfaces; the recess of the silicon device layer being defined by the top surface of the diaphragm and the one or more side surfaces; each of a plurality of piezoresistive regions being on the top surface of the diaphragm, extending to a respective side surface of the one or more side surfaces and further extending to the top surface of the support element; and a plurality of conductive regions being on the top surface of the support element, the plurality of conductive regions not extending to the one or more side surfaces nor the top surface of the diaphragm; wherein said each of the plurality of piezoresistive regions is connected to two respective conductive regions of the plurality of conductive regions; wherein the plurality of piezoresistive regions have a first ion dosage concentration; wherein the plurality of conductive regions have a second ion dosage concentration; and wherein the second ion dosage concentration is greater than the first ion dosage concentration. - 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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Specification