Patent ID: 8835278
Filing Date: 2014-09-16
Classification: H01L

Abstract:
1. A method comprising: providing a substrate comprising a bulk semiconductor material; forming at least two trenches in the substrate, thereby forming at least one fin of the bulk semiconductor material, wherein each of the at least two trenches comprises a trench bottom and trench sidewalls and the fin comprises fin sidewalls having a bottom region; filling the at least two trenches with an insulating material; partially removing the insulating material from the at least two trenches, wherein partially removing the portion of the insulating material comprises leaving a portion of the insulating material at the bottom of each of the at least two trenches, thereby forming an insulating region at the bottom of each of the at least two trenches; depositing a liner at least on the sidewalls of the at least two trenches; removing a layer from a top of the insulating region at the bottom of each of the at least two trenches, thereby forming a window opening at the bottom region of the fin sidewalls; transforming the bulk semiconductor material of the fin via the window opening, wherein the liner and isolating region at the bottom of each of the at least two trenches substantially limits the transforming to the bottom region of the fin, thereby forming a localized buried dielectric layer in the bottom region of the fin.