Patent ID: 6355531
Filing Date: 2002-03-12
Classification: H01L,Y10S

Abstract:
A method for fabricating a plurality of semiconductor devices on a semiconductor substrate, wherein properties of the plurality of semiconductor devices are different from each other, the method comprising the steps of:defining in the semiconductor substrate a plurality of channel regions which have various lengths, each of the plurality of channel regions being formed in a corresponding one of the plurality of semiconductor devices; forming various types of doped channel regions by performing in sequence various channel implant processes with respect to the plurality of channel regions, wherein each of the various types of doped channel regions has a different doping level determined by corresponding one of the various channel implant processes which are free from an implant mask; forming an oxide layer on each of the doped channel regions; and forming a gate conductor material layer on the oxide layer on each of the doped channel regions, wherein the gate conductor material layer determines a gate conductor work-function of a corresponding semiconductor device.