Patent ID: 9093514
Filing Date: 2015-07-28
Classification: H01L

Abstract:
1. A method to form a strained channel within a field-effect transistor, comprising: providing a substrate comprising a source region, a drain region, and a gate; forming a lightly-doped drain region in a vicinity of a boundary between the gate and the drain region or the source region; forming a recess within the source region or the drain region; exposing the substrate to a pulse of a phosphorous-containing source vapor to deposit an epitaxial material in the recess; exposing the substrate to a continuous etchant flow of one or more vapor etchants configured to selectively remove amorphous portions of the epitaxial material from the recess; and alternating between repeated pulses of the phosphorous-containing source vapor and the continuous etchant flow for selective removal of the amorphous portions of the epitaxial material in the recess.