Patent ID: 8268689
Filing Date: 2012-09-18
Classification: H01L

Abstract:
1. A method for fabricating a field effect transistor device, the method including: forming a first conducting channel and a second conducting channel on a substrate; forming a first gate stack on the first conducting channel to partially define a first device; forming second gate stack on the second conducting channel to partially define a second device; implanting ions to form a source region and a drain region connected to the first conducting channel and the second conducting channel; forming a masking layer over second device, a portion of the source region, a portion of the drain region, and a portion of the substrate; performing a first annealing process operative to change a threshold voltage of the first device; removing a portion of the masking layer to expose the second device; and performing a second annealing process operative to change the threshold voltage of the first device and a threshold voltage of the second device.