Patent ID: 7943460
Filing Date: 2011-05-17
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: forming a Ge-containing layer atop p-type device regions of a substrate, wherein the Ge-containing layer is not present in the n-type device regions of the substrate; forming a first dielectric layer atop the p-type device regions and the n-type device regions; removing the first dielectric layer from a second portion of the substrate including at least one of the p-type device regions and at least one of the n-type device regions, wherein a remaining portion of the first dielectric layer is present in a first portion of the substrate; forming a second dielectric layer overlying the first dielectric layer in the first portion of the substrate and overlying the second portion of the substrate; forming gate structures atop the p-type device regions and the n-type device regions, the gate structures to the n-type device regions including a rare earth metal; and forming analog devices in the first portion of the substrate and digital devices in the second portion of the substrate.