Patent ID: 6472244
Filing Date: 2002-10-29
Classification: B81C,G01L,G01P,H01L

Abstract:
A method of fabricating integrated microstructures of semiconductor material, the method including steps of:forming a sacrificial buried region of insulating material on a substrate of monocrystalline semiconductor material; epitaxially growing a first semiconductor material layer on an upper surface of said substrate; said first semiconductor material layer comprising a polycrystalline region over said sacrificial buried region, and a monocrystalline region elsewhere, said substrate and said semiconductor material layer surrounding said sacrificial buried region on all sides; and anisotropicaily etching openings, substantially narrow with respect to a horizontal width of the sacrificial buried region, having lateral walls that are substantially vertical, the openings etched from a lower surface of the substrate to the sacrificial buried region; and removing said sacrificial buried region via the openings to form an air gap between the lower surface of the substrate and the polycrystalline region.