Patent ID: 8987826
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; an inter-layer insulating film formed on a top surface of the semiconductor substrate, wherein the inter-layer insulating film includes a first trench on a first region of the semiconductor substrate and a second trench on a second region of the semiconductor substrate; a first work-unction metal pattern formed, in the first trench, on a side surface of the inter-layer insulating film and on the top surface of the semiconductor substrate, wherein the first work-function metal pattern does not extend up to a top surface of the inter-layer insulating film; a second work-function metal pattern is formed, in the second trench, on a side surface of the inter-layer insulating film and on the top surface of the semiconductor substrate, wherein an end of the second work-function metal pattern does not extend up to the top surface of the inter-layer insulating film; a first metal gate structure pattern formed on the first work-function metal pattern in the trench; and a second metal gate structure pattern formed on the second work-function metal pattern in the trench, wherein a height of the end of the first work-function metal pattern is greater than a height of the end of the second work-function metal pattern.