Patent ID: 7157357

Claim:
A method for forming a halo region in an NMOS transistor, comprising the steps of: forming, on a channel region of a semiconductor substrate, a structure having a gate insulation film pattern and a gate conductive film pattern stacked sequentially; forming an ion implantation buffer film comprising an oxide on an exposed surface of the semiconductor substrate and the gate conductive film pattern; performing a first ion implantation process for injecting fluorine ions through the ion implantation buffer film into the semiconductor substrate; performing a second ion implantation process for implanting p-type halo ions through the ion implantation buffer film into the semiconductor substrate; performing a third ion implantation process for implanting n-type impurity ions through the ion implantation buffer film into the semiconductor substrate; and diffusing the p-type halo ions and the n-type impurity ions using a thermal process.