Patent ID: 9515138
Filing Date: 2016-12-06
CPC Classification: H01L

Claim Text:
1. A method of making a semiconductor device, the method comprising: forming a nanosheet stack comprising a first layer arranged in contact with a substrate and a second layer arranged on the first layer; depositing and patterning a gate stack on the nanosheet stack; forming a first spacer along a sidewall of the gate stack; removing an endwall portion of the nanosheet stack that extends beyond the first spacer such that a portion of the second layer is exposed from a sidewall of the first spacer; depositing a second spacer along a sidewall of the first spacer; recessing the substrate beneath the second spacer to form an isolation region beneath the second spacer; depositing an oxide on the gate stack and the substrate within the isolation region and partially recessing the oxide to expose the second spacer; removing a portion of the second spacer such that the portion of the second layer is exposed; and growing by an epitaxial process an epitaxial layer on the portion of the second layer that is exposed to form a source/drain over the isolation region.