Patent ID: 7244652
Filing Date: 2007-07-17
Classification: H01L

Abstract:
1. A method of forming a split programming virtual ground (SPVG) SONOS memory, comprising: providing a substrate having at least a first conductive type well positioned in the substrate, and a plurality of select gate structures arranged in parallel and positioned on the first conductive type well; forming a plurality of sacrificial spacers alongside each select gate structure; performing an implantation process by utilizing the select gate structures and the sacrificial spacers as a mask to form a second conductive type doped region in the first conductive type well between two adjacent select gate structures; removing the sacrificial spacers; forming a composite dielectric layer covering the select gate structures subsequent to forming the second conductive type doped region in the first conductive type well between two adjacent select gate structures; and forming a plurality of word lines perpendicular to the select gate structures on the composite dielectric layer.