Patent ID: 7078284
Filing Date: 2006-07-18
Classification: H01L

Abstract:
1. A method of forming a notched gate comprising: supplying a substrate; forming a dummy gate on said substrate, said dummy gate having sidewalls; etching said dummy gate to form laterally recessed notches, wherein both upper and lower portions of said laterally recessed notches are spaced from said substrate in said dummy gate and wherein said sidewalls of said dummy gate below said lower portions of said laterally recessed notches remain unetched; forming sidewall spacers on said sidewalls of said dummy gate, said spacers including protrusions extending into said laterally recessed notches, wherein both upper and lower portions of said protrusions are spaced from said substrate; removing said dummy gate to form a recess, wherein said recess includes an air gap defined between said lower portions of said protrusions of said sidewall spacers and said substrate; forming a gate oxide in said air gap; and depositing a permanent gate material over said gate oxide to form a notched gate.