Patent ID: 7268041

Claim:
A method of forming a source contact of a flash memory device, comprising the steps of: forming a first interlayer insulating film on a semiconductor substrate in which first junction regions and gate electrode patterns for SSL and DSL of a cell region and second junction regions for peripheral circuits of a peripheral region are formed; patterning the first interlayer insulating film to form a source contact hole through which the first junction regions for the SSL of the cell region is exposed on one sides of the gate electrode patterns for SSL; forming a film on the entire surface including the source contact hole; performing a polishing process until the first interlayer insulating film is exposed to form a source contact; forming a second interlayer insulating film on the entire surface including the source contact; patterning the second interlayer insulating film to expose the second junction regions formed in the peripheral region of the semiconductor substrate; performing an ion implant process on the exposed junction regions; and performing a thermal treatment process to form third junction regions in the second junction regions of the peripheral region.