Patent ID: 6365472
Filing Date: 2002-04-02
Classification: H01L,Y10S

Abstract:
A manufacturing method of a semiconductor device having a MOS transistor, comprising the steps of:forming a gate electrode of the MOS transistor on a semiconductor substrate; forming a thin insulating film on a main surface of the semiconductor substrate; implanting impurity ions into first source and drain forming regions of the MOS transistor using the gate electrode as a mask; depositing a first film on the main surface of the semiconductor substrate; performing an anisotropic etching of the first film so as to expose a surface of the thin insulating film, thereby to form a first side wall on a side of the gate electrode; depositing a second film on the main surface of the semiconductor substrate; performing an anisotropic etching of the second film so as to expose the surface of the thin insulating film, thereby to form a second side wall on a side of the first side wall; implanting impurity ions into second source and drain forming regions of the MOS transistor using the gate electrode and the first and second side walls as a mask; and performing a heat treatment for activation of the implanted impurity ions after removing the second side wall.