Patent ID: 8138029
Filing Date: 2012-03-20
Classification: H01L

Abstract:
1. A method of forming a device comprising: providing a first substrate comprising a first semiconductor layer present on a surface of the first substrate, and a second semiconductor layer present on the first semiconductor layer, wherein the first semiconductor layer has a different composition than the second semiconductor layer, forming a first gate structure to a first semiconductor device on a first portion of the second semiconductor layer; etching a second portion of the second semiconductor layer that is adjacent to the first portion of the second semiconductor layer, and etching a portion of the first semiconductor layer that is present underlying the second portion of the second semiconductor layer; growing a third semiconductor layer on a remaining thickness of the first semiconductor layer; forming source regions and drain regions of the first semiconductor device into the third semiconductor layer and the remaining thickness of the first semiconductor layer; removing at least a portion of the first substrate, the first semiconductor layer and the second semiconductor layer underlying the gate structure to provide a recess aligned to the gate structure; forming a metal nitride spacer on one sidewall of the recess; and filling the recess with a dielectric material.