Patent ID: 8519494

Claim:
A method for manufacturing a micromechanical diaphragm structure having access from a rear of a p-doped silicon substrate, comprising: n-doping at least one contiguous lattice-type area of the substrate surface forming an n-doped lattice structure; porously etching a substrate area beneath the n-doped lattice structure; creating a cavity in the substrate area beneath the n-doped lattice structure; and growing a first monocrystalline silicon epitaxial layer on the n-doped lattice structure; wherein: at least one opening in the n-doped lattice structure is dimensioned in such a way that the at least one opening (i) is not closed by the growing first monocrystalline silicon epitaxial layer and (ii) forms at least one access opening to the cavity; an oxide layer is created on a cavity wall of the cavity; a rear access to the cavity is created, the oxide layer acting as an etch stop layer on the cavity wall; and the oxide layer is removed in an area of the cavity so that the rear access is produced for the micromechanical diaphragm structure provided above the cavity.