Patent ID: 6803268
Filing Date: 2004-10-12
Classification: H01L,Y10S

Abstract:
A method of fabricating an EEPROM semiconductor device having a plurality of memory cell transistors, comprising:forming a plurality of field insulating films in parallel with one another in a first direction on a semiconductor substrate, each of said plurality of field insulating films provided for a plurality of memory cell transistors, and said pluralilty of memory cell transistors formed between two associated adjacent field insulating films; forming a first gate insulating film in each of active regions; forming a plurality of first polysilicon films; patterning said first polysilicon film to form first polysilicon strips in parallel with one another, said first polysilicon strips formed in said first direction; forming a second gate insulating film on said first polysilicon strips forming a second polysilicon layer on said second gate insulating film; patterning said second polysilicon layer, said second gate insulating film, said plurality of first polysilicon strips and said first gate insulating film to form a plurality of control gates, a plurality of second gate insulators, a plurality of floating, gates, and a plurality of first gate insulators, respectively; forming drain and source regions; forming a first interlayer insulating layer on an entire surface of said semiconductor substrate; forming contact-holes through said first interlayer insulating layer in alignment with said drain and source regions; and forming a first metal wiring layer on said first interlayer insulating layer and filing said contact-holes therewith to couple said first wiring layer to a corresponding one of said drain and source regions in a memory area and a wiring layer of a logic area; forming a second metal wiring layer which is patterned so as to form a common source line connecting said source regions with each other; and forming aluminum backing wiring layers connecting to said plurality of control gates, simultaneously with forming said common source line.