Patent ID: 6417021
Filing Date: 2002-07-09
Classification: G01L

Abstract:
A method of fabricating an integrated piezoresistive pressure sensor comprising the steps of:forming an SOI substrate having a diaphragm; forming piezoresistive element in said diaphragm; wherein said step of forming an SOI substrate comprises the step of forming by bonding a body of semiconductor material having a first wafer of monocrystalline semiconductor material, a layer of insulating material over said first wafer, and a second wafer of monocrystalline semiconductor material over said layer of insulating material; wherein said step of forming a diaphragm comprises the steps of: forming at least one trench through said second wafer and extending up to said layer of insulating material; forming an opening in said layer of insulating material by chemical etching through said at least one trench; and depositing a layer of dielectric material on said second wafer; said layer of dielectric material outwardly closing said at least one trench and not extending into said opening.