Patent ID: 7572661

Claim:
A method for manufacturing a micromechanical sensor element having a hollow space and a membrane, comprising: applying a structured etch mask having a plurality of holes on a semiconductor substrate; creating depressions beneath the holes via an etch process; forming, via anodization, an area rendered porous beneath at least one of the depressions in the semiconductor substrate and a lattice-like structure, made of a substrate material that has not been rendered porous, on a surface of the semiconductor substrate between the depressions; removing the etch mask; and creating the hollow space out of the area rendered porous and the membrane above the hollow space out of the lattice-like structure via one of a temperature treatment and an electro polishing of the semiconductor substrate; wherein the semiconductor substrate has the same doping concentration in both the area rendered porous and the lattice-like structure, and wherein a formation of the area rendered porous beneath and a formation of the lattice-like structure are doping-independent.