Patent ID: 9190282
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor structure, comprising: providing a semiconductor substrate; forming a first dielectric layer on a surface of the semiconductor substrate based on a first-type oxidation; forming a high-K dielectric layer on a surface of the first dielectric layer; performing a first thermal annealing process to remove the first dielectric layer between the semiconductor substrate and the high-K dielectric layer, wherein the first thermal annealing process decomposes the first dielectric layer by reacting with a thermal annealing gas nitrogen that passes through the high-K dielectric layer to produce silicon and a gaseous product of nitride oxide (NxOy), the silicon being integrated into the semiconductor substrate to provide an integrated semiconductor substrate, such that the high-K dielectric layer is directly on a surface of the integrated semiconductor substrate; and while the high-K dielectric layer is on the integrated semiconductor substrate, performing a second thermal annealing process to treat the surface of the integrated semiconductor substrate to form a second dielectric layer between a remaining portion of the integrated semiconductor substrate and the high-K dielectric layer, based on a second-type oxidation different from the first-type oxidation, such that the high-K dielectric layer is on the second dielectric layer instead of the first dielectric layer.