Patent ID: 7413960

Claim:
A method of forming a floating gate electrode in a flash memory device, comprising: forming an isolation film in an inactive region so that a step with a predetermined thickness can be generated between an active region and the inactive region, the active and inactive region being defined on a semiconductor substrate; sequentially forming a tunnel oxide film, a polysilicon film for the floating gate electrode and an organic anti-reflection film over the polysilicon film, and then forming photoresist patterns on predetermined regions of the organic anti-reflection film; forming a patterned organic anti-reflection film having a bottom surface wider than a top surface and a slope at both sidewalls on the polysilicon film using the photoresist patterns as an etch mask; and patterning the polysilicon film for the floating gate electrode, the tunnel oxide film and a predetermined thickness of the isolation film using the patterned organic anti-reflection film as an etch mask, thus forming the floating gate electrode having a slope on top and bottom of the sidewalls.