Patent ID: 7176084
Filing Date: 2007-02-13
Classification: H01L

Abstract:
1. A conductive spacer process of forming sidewall control gates, comprising: forming a floating gate on a semiconductor substrate; forming a dielectric layer on said semiconductor substrate, at least covering sidewalls of said floating gate; forming a conductive layer on said dielectric layer; forming an oxide spacer on said conductive layer and adjacent to said sidewalls of said floating gate; and performing an anisotropic etch process on said conductive layer and using said oxide spacer as a hard mask to form conductive spacers at both sides of said floating gate, wherein said conductive spacer serves as a sidewall control gate and is separated from said floating gate by said dielectric layer wherein the step of forming said oxide spacer comprises: forming an oxide layer on said conductive layer; and performing an anisotropic etch process to remove horizontal portions of said oxide layer and expose said conductive layer, leaving vertical portions of said oxide layer adjacent to said sidewalls of said floating gate.