Patent ID: 6620687
Filing Date: 2003-09-16
Classification: H01L

Abstract:
A method for manufacturing a nonvolatile memory on a semiconductor substrate, said method comprising the steps of:forming a first dielectric layer on said semiconductor substrate as a gate dielectric; forming a first conductive layer on said first dielectric layer; forming a second dielectric layer on said first conductive layer; patterning said second dielectric layer and said first conductive layer; forming conductive spacers with sharp corners attached on said patterned second dielectric layer and said first conductive layer, wherein said conductive spacers, said second dielectric layer and said first conductive layer act as a floating gate; forming a tunneling dielectric layer on a surface of said floating gate; forming a third conductive layer on said tunneling dielectric layer as a control gate; defining said control gate by a lithography process; and performing an etching process to separate said nonvolatile memory.