Patent ID: 9466702
Filing Date: 2016-10-11
CPC Classification: H01L

Claim Text:
1. A method of making a semiconductor device comprising: forming a mask on a portion of a base layer covering a substrate; removing a portion of the base layer from the unmasked region such that the base layer has at least two thicknesses; removing the mask from the base layer having at least two thicknesses; forming a hole in the base layer to reveal the substrate; depositing a sacrificial material over the base layer having two thicknesses and a hole; planarizing the sacrificial material; patterning and etching the sacrificial material to define active areas comprising the hole; disposing a dielectric material over the patterned and etched sacrificial material; patterning and etching the dielectric material to form trenches to the base layer on two opposing sides of the active area, wherein the trenches are adjacent to the sacrificial material; removing the sacrificial material beneath the dielectric material to form a cavity bounded by the trenches and comprising the hole; forming a semiconductor layer in the cavity on the base layer having two thicknesses by epitaxial lateral overgrowth; removing the dielectric material to expose the semiconductor layer; and patterning and etching the semiconductor layer to form a first fin having a first height and a second fin having a second height.