Patent ID: 7923310
Filing Date: 2011-04-12
Classification: B82Y,H01L,Y10S

Abstract:
1. A core-shell-shell (CSS) nanowire transistor (NWT) fabrication method, the method comprising: providing a cylindrical CSS nanostructure with a semiconductor core, an insulator shell surrounding the semiconductor core, and a conductive shell surrounding the insulator shell, the CSS nanostructure having a lower hemicylinder overlying a substrate surface; conformally depositing a first insulating film overlying the CSS nanostructure; anisotropically plasma etching the first insulating film; forming insulating reentrant stringers adjacent the nanostructure lower hemicylinder; conformally depositing a conductive film; anisotropically plasma etching selected regions of the conductive film, forming conductive film gate straps overlying a gate electrode in a center section of the CSS nanostructure; isotropically etching to remove the insulating reentrant stringers adjacent the center section of the CSS nanostructure; isotropically etching the conductive shell overlying the S/D regions; depositing a screen oxide layer over the CSS nanostructure; and, doping source/drain (S/D) regions in end sections of the CSS nanostructure flanking the CSS nanostructure center section.