Patent ID: 7704774
Filing Date: 2010-04-27
Classification: B81B,B81C,G01L,H01L

Abstract:
1. A method for fabricating a pressure sensor comprising: providing a first wafer comprising a base substrate of silicon with integrated circuitry integrated thereon and at least one material layer deposited on said base substrate; providing a second wafer; manufacturing a recess in said first wafer by locally removing or omitting said material layer; and mounting said second wafer, or a chip prepared from said second wafer, on said first wafer, and electrically connecting said second wafer to said circuitry on said first wafer, wherein said recess does not reach into said base substrate, and wherein said second wafer comprises a handle substrate, a silicon layer and an insulating layer between said handle substrate and said silicon layer, said silicon layer being positioned to form at least part of a deformable membrane over said recess for sensing a pressure, said second wafer comprising a cavity closed by said deformable membrane.