Patent ID: 8003300

Claim:
A method for making a T-gate, shifted T-gate or Gamma gate electrode structure on a substrate, said method comprising the steps of: providing a layer of photosensitive material on at least a portion of said substrate, said layer of photosensitive material having a thickness; exposing a first area of said layer of photosensitive material to radiation having a first intensity; exposing a second area of said layer of photosensitive material to a second radiation having a second intensity; wherein said second area of said layer partially overlaps said first area of said layer in an overlapping area; developing said layer of photosensitive material by removing said photosensitive material from said first and second areas, wherein said photosensitive material is completely removed along the entire thickness of the layer of photosensitive material for the overlapping area so as to expose an exposed region of the substrate and wherein said photosensitive material is only partially removed along the thickness of the layer of photosensitive material for non-overlapping areas of the first and second areas, thereby generating a recessed feature in said layer of photosensitive material having a non-uniform depth profile, wherein said recessed feature includes a first feature with a first length corresponding to both the first area and the second area and a second feature with a second length corresponding to the overlapping area, wherein said second feature of the recessed feature exposes the exposed region of said substrate; depositing a material on said layer of photosensitive material having said recessed feature and on said exposed region of said substrate so as to at least partially fill said recessed feature, thereby generating said structure of said material having a selected non-uniform cross sectional geometry corresponding to the non-uniform depth profile in said photosensitive layer, said structure having a stem portion in contact with the substrate corresponding to the second feature and a top portion corresponding to the first feature; and removing said layer of photosensitive material; thereby making said T-gate, shifted T-gate or Gamma gate electrode structure on said substrate.