Patent ID: 7648917
Filing Date: 2010-01-19
Classification: H01L

Abstract:
1. A manufacturing method of a solid-state imaging device which has a pixel region and a peripheral region, said method comprising the steps of: forming a first insulating film and a second insulating film on a silicon substrate having a pixel region and a peripheral region such that they cover sides of a gate electrode formed on the silicon substrate in the pixel region and sides of a gate electrode formed on the silicon substrate in the peripheral region, the first and second insulating films having different etching properties from each other; subjecting the second insulating film to selective etching over both gate electrodes, and forming sidewalls on the sides of both of the gate electrodes; subjecting the gate electrodes with the sidewalls in the peripheral region and the pixel region to ion implantation at the same time; covering the gate electrodes with the sidewalls and the silicon substrate with a third insulating film; covering the gate electrode with the sidewalls and the third insulting film in one of the regions with a mask material, and subjecting the resultant structure to etching to remove third insulating film not covered by the mask; removing the mask material; forming a metal film capable of forming a silicide over the gate electrodes with sidewalls and third insulating film; and effecting silicide formation to form a silicide layer from the silicide, wherein, the sidewalls of the gate electrodes in the pixel and peripheral regions are effectively the same in structure, and said step of forming a third insulating layer includes a first step of forming a plasma silicon nitride film and a second step of forming a low pressure silicon nitride film.