Patent ID: 9196700
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A semiconductor structure comprising: a first channel region location in a semiconductor substrate; a second channel region located in said semiconductor substrate: a trench isolation region separating said first channel region from said second channel region; a first gate dielectric located over said first channel region; and a second gate dielectric located over said second channel region, wherein said first and second channel regions have different compositions, and wherein said first and second gate dielectrics have substantially same thickness and comprise a material stack of, from bottom to top, a Si-containing oxynitride layer, a first Si-containing oxynitride material portion, and a second Si-containing oxynitride material portion, and wherein a topmost surface of each Si-containing oxynitride layer is coplanar with a topmost surface of said trench isolation region and said Si-containing oxynitride layer of said first gate dielectric has a different composition than said Si-containing oxynitride layer of said second gate dielectric.