Patent ID: 7993949

Claim:
A method of making a component from a heterogeneous substrate comprising first and second portions in at least one monocrystalline material, said first portion having a monocrystalline Si surface and a sacrificial layer constituted by at least one stack of at least one layer of monocrystalline Si situated between two layers of monocrystalline SiGe, one of said SiGe layers being epitaxied on said monocrystalline Si surface of said first portion the stack being disposed between said first and second portions of monocrystalline material, wherein the method comprises etching said stack by making: e) at least one opening in the first and/or second portion and the first and/or second layer of SiGe so as to reach the layer of Si; and f) eliminating all or part of the layer of Si.