Patent ID: 9450078
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A method for forming a punch-through stopper region in a fin field effect transistor (finFET) device, the method comprising: etching a substrate to form a pair of trenches, the pair of trenches defining a fin structure, wherein a cap layer is disposed on a top surface of the fin structure; implanting a first dose of ions such that a portion of the first dose of ions is implanted into the substrate through a bottom wall of each trench to form a pair of first dopant regions in the substrate, wherein each first dopant region extends at least partially under a channel region of the fin structure; and etching the substrate at the bottom wall of each trench to increase a depth of each trench, wherein etching the substrate at the bottom wall of each trench removes a portion of each first dopant region under each trench, and wherein a remaining portion of the pair of first dopant regions under the fin structure at least partially defines the punch-through stopper region; and wherein the pair of first dopant regions is not subjected to a thermal anneal process after implanting the first dose of ions and prior to etching the substrate at the bottom wall of each trench.