Patent ID: 8637357
Filing Date: 2014-01-28
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: forming a hard mask over a first region of a workpiece; forming a first gate dielectric material over the hard mask and a second region of the workpiece; forming a first gate material over the first gate dielectric material; removing the first gate material, the first gate dielectric material, and the hard mask from over the first region of the workpiece, leaving the first gate material and the first gate dielectric material residing over the second region of the workpiece; forming a second gate dielectric material over the first region of the workpiece and over the first gate material in the second region of the workpiece, the second gate dielectric material comprising a different material than the first gate dielectric material; forming a second gate material over the second gate dielectric material; removing the second gate material and the second gate dielectric material from over the second region of the workpiece, leaving the second gate material and the second gate dielectric material over the first region of the workpiece; and patterning the first gate material, the second gate material, the first gate dielectric material and the second gate dielectric material, wherein the first gate material comprises a first gate of a first transistor, wherein the first gate dielectric material comprises a first gate dielectric of the first transistor, wherein the second gate material comprises a second gate of a second transistor, and wherein the second gate dielectric material comprises a second gate dielectric of the second transistor.