Patent ID: 7763512

Claim:
A method for manufacturing a plurality of floating gate type semiconductor devices on a substrate having a surface, the method comprising: forming, on the substrate surface, a stack comprising an insulating film, a first layer of floating gate material and a layer of sacrificial material, forming a set of isolation zones between the a plurality of floating gate type semiconductor devices by forming a set of trenches by removing portions of the insulating film, portions of the first layer of floating gate material, portions of the layer of sacrificial material and portions of the substrate, for each floating gate type semiconductor device, the first layer of floating gate material, thereby, having a top surface and side walls, and filling the trenches with isolation material; removing the sacrificial material, thus leaving a cavity defined by the isolation zones and the top surface of the first layer of floating gate material, and completely filling the cavity with a second layer of floating gate material, the first layer of floating gate material and the second layer of floating gate material thus forming together a floating-gate.