Patent ID: 6180978
Filing Date: 2001-01-30
Classification: H01L

Abstract:
A replacement gate MOSFET, comprising:a doped silicon substrate;an oppositely doped epitaxial silicon layer formed on the doped silicon substrate;a gate oxide layer with a top surface and a bottom surface wherein said bottom surface of said gate oxide layer contacts said oppositely doped epitaxial silicon layer;a permanent gate on said gate oxide layer with a bottom surface, side surfaces, and a top surface wherein said bottom surface of said permanent gate contacts said top surface of said oxide layer;sidewall spacers formed on the side surfaces of said permanent gate; andlateral notches adjacent to either side of the bottom surface of said permanent gate, said lateral notches having bottom surfaces, side surfaces and top surfaces wherein said bottom surfaces of said lateral notches are formed by the gate oxide layer and said top surfaces of said lateral notches are formed by the sidewall spacers.