Patent ID: 6627515
Filing Date: 2003-09-30
Classification: H01L

Abstract:
A method of forming a buried insulator region in a semiconductor substrate with portions of said buried insulator region formed underlying portions of a semiconductor shape, comprising the steps of:forming a semiconductor alloy layer on said semiconductor substrate; forming a semiconductor layer on said semiconductor alloy layer; forming an insulator layer on said semiconductor layer; forming composite shapes on said semiconductor alloy layer, with each composite shape comprised of an overlying insulator shape and comprised of an underlying semiconductor shape, with portions of said semiconductor alloy layer exposed between said composite shapes; forming insulator spacers on the sides of said composite shapes; forming buried insulator regions in top portions of said semiconductor alloy layer exposed between said composite shapes, with portions of said buried insulator regions formed underlying the semiconductor shapes of said composite shapes; removing insulator shapes and said insulator spacers resulting in semiconductor shapes, wherein a first portion each semiconductor shape overlays said semiconductor alloy layer, and wherein second portions of each semiconductor shape overlays said buried insulator regions; and forming a semiconductor device in a semiconductor shape.