Patent ID: 6527961
Filing Date: 2003-03-04
Classification: G01L

Abstract:
A method of manufacturing an integrated circuit on a silicon substrate including a pressure microsensor, comprising the following steps:forming a region comprising a selectively removable material on a surface of the silicon substrate, a surface of the region being sized relative to the surface of the silicon substrate so that transistor integrated circuitry may be formed over the surface of the silicon substrate not covered by the selectively removable material; forming a silicon layer on the region and on the substrate wherein the silicon layer is an epitaxial growth such that a monocrystalline silicon grows from the surface of the silicon substrate not covered by the selectively removable material and a polycrystalline silicon grows on the region, the monocrystalline silicon being dimensioned for the transistor integrated circuitry to be formed therein; forming holes in the silicon layer above the region; removing the selectively removable material from the region by applying a chemical composition through the holes until a diaphragm of the pressure microsensor having a predetermined thickness is defined at least substantially by the polycrystalline silicon on the region, said diaphragm being attached to the silicon substrate along edges of said polycrystalline silicon and separated therefrom by the region; forming a dielectric layer over the polycrystalline silicon and the holes therein so as to seal the holes; forming electrical devices for detecting mechanical deformation of the diaphragm; and wherein the holes have widths smaller than the thickness of the diaphragm.