Patent ID: 7550364
Filing Date: 2009-06-23
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor structure comprising: forming an n-doped region in a bulk Si-containing substrate, wherein said n-doped region extends from a portion of a first device region to a portion of a second device region within said bulk-Si containing substrate; forming a Si-containing layer directly on an upper surface of said bulk Si-containing substrate, wherein said Si-containing layer includes a first Si-containing portion located in said first device region and a second Si-containing portion located in said second device region; forming a contiguous material stack including a first material stack portion located over said first device region and a second material stack portion located over said second device region, wherein said first material stack portion includes a tensile nitride film, and wherein said second material stack portion includes a compressive nitride film; separating a first stack of said first material stack portion and said first Si-containing portion from a second stack of said second material stack portion and said second Si-containing portion by forming a trench into said first and second material stacks between said first and second device regions which extends down through said n-doped region and laterally etching said n-doped region to create voids on each side of the trench, wherein said tensile nitride film generates a compressive strain within said first device region as a free surface surrounding a perimeter of said first Si-containing portion in said first device region is formed within said voids, and wherein said compressive nitride film generates a tensile strain within said second device region as a free surface surrounding a perimeter of said second Si-containing portion in said second device region is formed within said voids; filling said voids and said trench with an oxide; and removing one of said tensile nitride film or compressive nitride film from said second device region.