Patent ID: 7935599
Filing Date: 2011-05-03
Classification: B82Y,H01L

Abstract:
1. In the fabrication of a nanowire transistor (NWT), a method for removing reentrant stringers, the method comprising: providing a cylindrical nanostructure with an insulator shell having an outside surface with a lower hemisphere overlying a substrate surface, the nanostructure including a semiconductor core surrounded by the insulator shell; conformally depositing a conductive film overlying the nanostructure with a reentrant section underlying the insulator shell outside surface lower hemisphere; depositing a hard mask insulator overlying the conductive film, with a reentrant section adjacent the conductive film reentrant section; anisotropically plasma etching selected regions of the hard mask; forming a conductive film gate electrode substantially surrounding a cylindrical section of the insulator shell; forming reentrant stringers from the reentrant section of the conductive film layer underlying the insulator shell outside surface lower hemisphere, and from the reentrant section of the hard mask insulator adjacent the reentrant section of the conductive film; isotropically etching the reentrant section of the conductive film; and, removing the conductive film portion of the reentrant stringers.