Patent ID: 7785953
Filing Date: 2010-08-31
Classification: H01L

Abstract:
1. A method for forming floating-gate electrodes on a semiconductor substrate, the method comprising: depositing a layer of dielectric material on a surface of the semiconductor substrate; depositing a layer of material for floating-gate electrodes on the layer of dielectric material; etching a first plurality of trenches; filling the first plurality of trenches at least partially with an insulating material to form insulation trenches; etching a second plurality of trenches to shape a first side wall of a plurality of floating-gate electrodes, the first side wall running parallel to the longitudinal direction of the insulation trenches; covering the first side wall at least partially with a first layer; and etching a third plurality of trenches to shape a second side wall of the plurality of floating-gate electrodes, so that each floating-gate electrode of the plurality of floating-gate electrodes comprises one first side wall and one second side wall opposing the first side wall.