Patent ID: 6204145
Filing Date: 2001-03-20
Classification: H01L,Y10S

Abstract:
A method of making one or more silicon-on-insulator structures in an integrated circuit, the method comprising:forming a first set of trenches in the silicon substrate to define laterally-isolated bars of silicon in the silicon substrate;filling the first set of trenches with silicon oxide to form silicon oxide bars;forming a second set of trenches in the substrate, wherein the second set of trenches intersect the first set of trenches to form silicon islands at least partly bounded by the silicon oxide bars and the second set of trenches;fully undercutting the laterally-isolated bars of silicon between the second set of trenches to define substantially evacuated regions underneath the silicon islands, the evacuated regions fully separating the islands from the substrate and leaving the islands supported only by respective portions of the silicon oxide bars; andfilling the substantially evacuated regions with silicon oxide after fully undercutting the laterally-isolated bars of silicon, with the silicon oxide preventing free movement of one or more of the silicon islands relative the silicon substrate.