Patent ID: 6013551
Filing Date: 2000-01-11
Classification: H01L

Abstract:
A method of manufacture of self-aligned floating gate, flash memory device on a semiconductor substrate comprising:forming a blanket silicon oxide layer over said substrate,forming a blanket floating gate conductor layer over said silicon oxide layer,patterning said blanket silicon oxide layer, said floating gate conductor layer and said substrate in a patterning process with a single floating gate electrode mask forming a floating gate electrode from said floating gate conductor layer and said silicon oxide layer and simultaneously forming trenches in said substrate adjacent to said floating gate electrode and aligned with said floating gate electrode thereby patterning the active region in said substrate,forming a blanket trench dielectric structure filling said trenches and planarizing said trench dielectric structure with the surface of said floating gate electrode,forming an interconductor dielectric layer over said floating gate electrode, andforming a control gate conductor over said interconductor dielectric layer.