Patent ID: 6784066
Filing Date: 2004-08-31
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device having a first area, a second area and a third area on a semiconductor substrate, comprising:a step of forming plurality of gate electrodes over the semiconductor substrate; a step of forming lightly-doped regions by implanting an impurity in the semiconductor substrate with the gate electrodes as masks; a step of forming a first insulating film on the whole surface of the semiconductor substrate so as to cover the plurality of gate electrodes; a step of forming a second insulating film on the first insulating film; a step of forming sidewalls on the sides of the plurality of gate electrodes respectively by means of etching the first insulating film and the second insulating film, each of the sidewalls including a layer for the first insulating film covering the sides of the gate electrodes and a layer for the second insulating film covering the layer for the first insulating film; a step of forming heavily-doped regions by implanting an impurity in the second area and the third area with the sidewalls as masks; a first removing step of removing the layer for the second insulating film formed on the sides of the gate electrodes after said step of forming heavily doped regions; a third insulating film forming step of forming a third insulating film on the whole surface of the semiconductor substrate after said first removing step; and an interlayer dielectric forming step of forming an interlayer dielectric on the third insulating film.