Patent ID: 7932118

Claim:
Method of producing at least one mechanical component of MEMS or NEMS structure from a monocrystalline silicon substrate ( 1 ), comprising the steps of: a) forming anchoring zones ( 4 ) in one face ( 2 ) of the substrate ( 1 ) to delimit at least in part the mechanical component, b) forming, on said face ( 2 ) of the substrate ( 1 ), a lower protective layer ( 5 ) made of material other than silicon and obtained by epitaxy from said face of the substrate, wherein this lower protective layer is monocrystalline at least outside of the anchoring zones, c) forming on the lower protective layer ( 5 ) a silicon layer ( 7 ) obtained by epitaxy from the lower protective layer, wherein this silicon layer ( 7 ) is monocrystalline at least outside of the anchoring zones, d) forming an upper protective layer ( 9 ) on the silicon layer ( 7 ), e) etching the upper protective layer ( 9 ), the silicon layer ( 7 ) and the lower protective layer ( 5 ), between the anchoring zones ( 4 ), according to a pattern defining the mechanical component, until the monocrystalline silicon substrate ( 1 ) is reached and to provide access routes ( 10 ) to the monocrystalline silicon substrate, f) forming a protective layer ( 11 ) on the walls formed by the etching of the pattern of the mechanical component in the epitaxied silicon layer ( 7 ), g) releasing the mechanical component by isotropic etching of the monocrystalline silicon substrate ( 1 ) from the access routes ( 10 ) to the monocrystalline silicon substrate, this isotropic etching not attacking the lower ( 5 ) and upper ( 9 ) protective layers and the protective layer of the walls ( 11 ).