Patent ID: 8969932
Filing Date: 2015-03-03
Classification: H01L,Y10S

Abstract:
1. A method of forming a device in and above a semiconducting substrate, comprising: prior to forming an isolation region in said substrate for said device, forming a doped well region and a doped punch-stop region in said substrate; introducing dopant material into said substrate to form a dopant-containing layer proximate an upper surface of said substrate, wherein said dopant material is adapted to retard diffusion of boron or phosphorous; performing an epitaxial deposition process to form an undoped semiconducting material above said dopant-containing layer; forming a plurality of spaced-apart trenches that extend at least partially into said substrate, said trenches defining a fin for said device comprised of at least said undoped semiconducting material; forming at least a local isolation insulating material in said trenches; and forming a gate structure around at least said undoped semiconducting material, wherein a bottom of a gate electrode of said gate structure is positioned approximately level with or below a bottom of said undoped semiconducting material.