Patent ID: 7833405

Claim:
A method of manufacturing a micromechanical component, comprising: providing a substrate; providing a buried layer on the surface of the substrate, the buried layer having higher doping concentration than the surrounding substrate; providing a monocrystalline layer above the substrate; providing inside the monocrystalline layer at least one area having higher doping concentration than the surrounding monocrystalline layer; selectively porous etching the at least one area having higher doping concentration to produce corresponding at least one porous area; and forming a permanent cavity under the monocrystalline layer and a membrane area above the permanent cavity by dissolving out the buried layer, wherein the dissolving out the buried layer to form the permanent cavity takes place entirely through the at least one porous area previously produced, by an electropolishing process in which an etchant is introduced, via penetration of the at least one porous area, to the area to be dissolved, wherein the at least one porous area is part of the membrane area above the permanent cavity.