Patent ID: 7622762

Claim:
A method for fabricating a nonvolatile semiconductor memory comprising: forming a barrier insulator film on a semiconductor substrate; subsequently forming a first interlayer insulator film on the barrier insulator film; delineating a data transfer line contact and a source line contact in the first interlayer insulator film; forming a trench in the first interlayer insulator film to bury a source line and a passing interconnect; depositing a first barrier metal in the trench; depositing a first metallic material to fill the trench; etching back the first metallic material to form the data transfer line contact, the source line contact, a source line, and a passing interconnect in the first interlayer insulator film; depositing a second interlayer insulator film on the first interlayer insulator film; delineating for a via contact in second interlayer insulator film; etching the second interlayer insulator film so as to extend the top of the data transfer line contact; depositing a second barrier metal on the top of the data transfer line contact; filling a second metallic material on the second barrier metal; etching back the second metallic material; and forming the via contact in second interlayer insulator film.