Patent ID: 7416939

Claim:
A method for manufacturing on a substrate a semiconductor device with a floating-gate and a control-gate, the method comprising: first forming isolation zones in a surface of the substrate, thereafter depositing a floating gate layer over the substrate and the isolation zones, etching the floating gate layer to form the floating gate on the substrate between two of the isolation zones, thereafter extending the floating gate using conductive spacers, thereafter forming the control gate over the floating gate and the conductive spacers, wherein etching the floating gate layer to form the floating gate includes forming two opposite walls of the floating gate on the substrate, one of the two opposite walls located above each of the two isolation zones, and forming a recess in each of the two isolation zones, each of the recesses having a wall that is substantially in line with one of the two opposite walls of the floating gate, the recesses extending to a depth from the surface of the substrate.