Patent ID: 6300197
Filing Date: 2001-10-09
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device having MIS field effect transistors (MIS-FETs) with gate insulating films of different film thicknesses formed in element regions on the same semiconductor substrate, comprising:effecting channel ion-implantation with respect to at least one of the element regions in which the MIS-FETs are to be formed;selectively doping at least one impurity for changing the growth rate of an insulating film into said at least one of the element regions, said at least one impurity including a first impurity composed of electrically inactive ions for enhancing the growth rate of the gate insulated films, the first impurity being doped in a channel portion of a MIS-FET to be formed; andsimultaneously forming gate insulating films of different film thicknesses on the element regions which have been subjected to the channel ion-implantation and the doping of impurity.