Patent ID: 7981715

Claim:
A method for producing a MEMS/NEMS structure from a substrate comprising at least one portion made in a monocrystalline semiconductor material, the structure comprising a flexible mechanical element connected to said portion of the substrate by at least one anchoring zone, the method comprising the following steps: forming a first protection layer in the monocrystalline semiconductor material on a free face of said portion of the substrate, the first protection layer being made in a different material from that of said substrate portion made in the monocrystalline semiconductor material, etching of the first protection layer and the substrate in order to produce at least one cavity, the etching being conducted so as to leave an overhang in the material of the protection layer on edges of the cavity, filling of the cavity by an electrically insulating material at least up to a free face of the first protection layer in order to obtain an insulating anchoring portion, forming, by epitaxy of a semiconductor material from the first protection layer and the electrically insulating material, an epitaxied layer designed for a production of the flexible mechanical element, the epitaxied layer being monocrystalline on the first protection layer and polycrystalline on the electrically insulating material, releasing the flexible mechanical element by etching, through a mask, from at least the first protection layer, the etching allowing at least one portion of said overhang to remain.