Patent ID: 9391076
Filing Date: 2016-07-12
CPC Classification: H01L

Claim Text:
1. A semiconductor chip, comprising: a substrate having a semiconducting surface comprising a first layer formed directly on a second layer, the semiconducting surface having formed therein a plurality of active regions extending through the first layer and the second layer, the plurality of active regions comprising at least a first active region and a second active region, the first layer comprising a substantially undoped layer, and the second layer comprising a highly doped screening layer, a first gate insulating film formed directly on the first layer in the first active region, a second gate insulating film formed directly on the first layer in the second active region; and a first semiconductor device comprising the first gate insulating film formed in the first active region and a second semiconductor device comprising the second gate insulating film formed in the second active region, wherein a thickness of the first layer in the first active region and a thickness of the first layer in the second active region are different, wherein a thickness of the second layer in the first active region and a thickness of the second layer in the second active region are substantially the same, wherein a position of a boundary between the first layer and the second layer for each of the first active region and the second active region is substantially the same throughout the substrate, and wherein the first layer in the first active region and the first layer in the second active region are common undoped epitaxial layer of a single semiconductor material.