Patent ID: 7399690

Claim:
A method of fabricating a semiconductor device, the method comprising: providing a workpiece; forming at least one feature over the workpiece, the at least one feature having a top surface and sidewalls; forming a first material layer over the at least one feature and over the workpiece, the first material layer comprising a first material; removing the first material layer from over the workpiece and from over the top surface of the at least one feature, leaving the first material layer over the sidewalls of the at least one feature; forming a second material layer over the workpiece, the at least one feature, and the first material layer, the second material layer comprising a second material; forming a third material layer over the second material layer, the third material layer comprising the first material; removing at least the third material layer from over the workpiece and from over the top surface of the at least one feature, leaving the third material layer over the sidewalls of the at least one feature; affecting at least the workpiece; and removing the third material layer from over the sidewalls of the at least one feature, wherein removing the first material layer from over the workpiece and from over the top surface of the at least one feature and removing the third material layer from over the workpiece and from over the top surface of the at least one feature comprise anisotropic etch processes, and wherein removing the third material layer from over the sidewalls of the at least one feature comprises an isotropic etch process.