Patent ID: 8168547
Filing Date: 2012-05-01
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device comprising steps of: before the step (a), forming a silicon oxide film over the semiconductor substrate; (a) forming a first layer over a semiconductor substrate; (b) after the step (a), forming a second layer over the first layer; and (c) after the step (b), forming a cap layer over the second layer, wherein the first and second layers compose a gate insulating film of a MIS transistor, wherein the cap layer composes a gate electrode of the MIS transistor, wherein the first layer includes Hf and O, wherein the second layer includes either Al and O or Ta and O, wherein a thickness of the second layer is smaller than a thickness of the first layer, wherein a thickness of the silicon oxide film is smaller than a thickness of the first layer, and wherein a thickness of the second layer is smaller than a thickness of the silicon oxide film.