Patent ID: 8598000

Claim:
A method of making a transistor, comprising: defining a gate oxide region by patterning an oxide layer formed over a substrate to create a source-side edge and a drain-side edge of the gate oxide region; applying a first photoresist over a gate, the gate including the gate oxide region of the oxide layer having the source-side edge and the drain-side edge over the substrate and a conductive material formed over the gate oxide region; using the first photoresist as a mask, performing a first etching of a first side of the gate to remove a first portion of the conductive material; using the first photoresist and the conductive material as a mask after the first etching, implanting an impurity region into the substrate such that the impurity region is self-aligned to the gate, wherein the implantation occurs at least in a portion of the substrate that is not covered by the gate oxide region; applying a second photoresist over the gate after implanting; and using the second photoresist as a mask, performing a second etching of a second side of the gate to remove a second portion of the conductive material.