Patent ID: 9472555
Filing Date: 2016-10-18
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor structure, said method comprising: providing a first substrate comprising a first semiconductor material having a first crystallographic orientation, wherein a second substrate portion comprising a second semiconductor material having a second crystallographic orientation that is different from said first crystallographic orientation is present on a portion of said first substrate; forming a first nanosheet stack structure on said first substrate and in a first device region, and a second nanosheet stack structure on said second substrate portion and in a second device region, said first nanosheet stack structure comprising a first portion of a base sacrificial layer and alternating layers of semiconductor channel material and sacrificial semiconductor material, each of which has said first crystallographic orientation, and said second nanosheet stack structure comprising a second portion of said base sacrificial layer, and alternating layers of semiconductor channel material and sacrificial semiconductor material, each of which has said second crystallographic orientation; forming a first sacrificial gate structure straddling said first nanosheet stack structure and a second sacrificial gate structure straddling said second nanosheet stack structure; removing exposed portions of the first and second nanosheet stack structures; removing said first and second sacrificial gate structures; and removing remaining portions of said base sacrificial layer and said layers of sacrificial semiconductor material to provide vertically stacked and suspended nanosheets of said semiconductor channel material in said first and second device regions, wherein said nanosheets of said semiconductor channel material in said first device region have said first crystallographic orientation and said nanosheets of said semiconductor channel material in said second device region have said second crystallographic orientation.