Patent ID: 8138052

Claim:
A non-transitory computer readable medium encoded with program instructions for execution by a processor, which when executed by the processor, cause at least one processing tool to fabricate a transistor, the program instructions comprising instructions for performing the steps of: providing a silicon layer; forming a first layer on the silicon layer, the first layer comprising a high dielectric constant material; forming a second layer on the first layer, the second layer comprising a metal or metal alloy; forming a third layer on the second layer, the third layer comprising silicon or polysilicon; etching, by the at least one processing tool, at least the first and second layers so as to form a gate stack; and etching, by the at least one processing tool, the third layer without etching the first and second layers so as to substantially reduce the width of the third layer, so that a lateral extent of the second layer is substantially greater than a lateral extent of the third layer.