Patent ID: 6586282
Filing Date: 2003-07-01
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:forming a first insulating film on a silicon substrate; forming a gate oxide film in a MOS type transistor area; simultaneously forming by one patterning process a dot pattern obtained by processing a thin film in a dot shape in a portion that becomes later a pattern for laser trimming position registration, a polycrystal silicon fuse in a portion that becomes later a fuse element, and a gate electrode formed from said thin film in said MOS type transistor area; forming a second insulating film from an NSG film, a PSG film or a BPSG film after a source area and a drain area are formed in said MOS type transistor area and said pattern portion for laser trimming position registration; removing said second insulating film from said pattern portion for laser trimming position registration and opening only a contact area in said MOS type transistor area and said fuse element portion; forming a metallic film in said MOS type transistor area, said fuse element portion, and said pattern portion for laser trimming position registration; etching the metallic film to remove the metallic film from the fuse element portion while leaving a given portion of the metallic film for wiring in said MOS type transistor area and while leaving the metallic film in said pattern portion for laser trimming position registration; forming a protective film over the MOS type transistor area, the fuse element portion and the pattern portion for laser trimming position registration; and patterning the protective film so that the protective film is left in said MOS type transistor area, only an area for irradiating a laser beam is opened in said fuse element portion, and said protective film is removed from said pattern portion for laser trimming position registration.