Patent ID: 9305922
Filing Date: 2016-04-05
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a substrate including a first surface; an inter-layer insulating film disposed on the first surface of the substrate, the inter-layer insulating film including a first trench on a first region of the substrate and a second trench on a second region of the substrate; a first work-function metal pattern disposed in the first trench; a second work-function metal pattern disposed in the second trench; a first metal gate structure pattern disposed in the first trench and filling the first trench, the first metal gate structure pattern covering the first work-function metal pattern; and a second metal gate structure pattern disposed in the second trench and filling the second trench, the second metal gate structure pattern covering the second work-function metal pattern, wherein a first depth of the first metal gate structure pattern is greater than a second depth of the first metal gate structure pattern, the first depth of the first metal gate structure pattern being measured from a center of a surface of the first metal gate structure pattern, the second depth of the first metal gate structure pattern being measured from a first edge of the surface of the first metal gate structure pattern, the first depth of the first metal gate structure pattern is greater than a third depth of the first metal gate structure pattern, the third depth of the first metal gate structure pattern being measured from a second edge of the surface of the first metal gate structure pattern, the second edge of the surface of the first metal gate structure pattern being opposite to the first edge of the surface of the first metal gate structure pattern, a first depth of the second metal gate structure pattern is greater than a second depth of the second metal gate structure pattern, the first depth of the second metal gate structure pattern being measured from a center of a surface of the second metal gate structure pattern, the second depth of the second metal gate structure pattern being measured from a first edge of the surface of the second metal gate structure pattern, and the first depth of the second metal gate structure pattern is greater than a third depth of the second metal gate structure pattern, the third depth of the second metal gate structure pattern being measured from a second edge of the surface of the second metal gate structure pattern, the second edge of the surface of the second metal gate structure pattern being opposite to the first edge of the surface of the second metal gate structure pattern.