| 摘要 |
A damascene wiring structure having: a lower wiring structure (5); an interlayer insulating film (7) covering the lower wiring structure (5); a wiring trench (G2) formed in the interlayer insulating film (7) from an upper surface thereof, and a via hole (VIA) passing through the interlayer insulating film (7) from a lower surface of the wiring trench (G2) in an inner area thereof and reaching the lower wiring structure (5), the via hole (VIA) having a diameter smaller than a width of the wiring trench (G2); an insulating pillar pattern (RI) projecting upward from the lower surface of the wiring trench (G2) in an area outside of the via hole (VIA), the insulating pillar pattern (RI) being made of a same material as the interlayer insulating film (7), wherein a first occupied area factor of the insulating pillar pattern (RI) in a first area of the wiring trench (G2) near said via hole (VIA) is higher than a second occupied area factor of the insulating pillar pattern (RI) in a second area of the wiring trench (G2) remote from the via hole (VIA); and a dual damascene wiring (10) formed by filling the wiring trench (G2) and said via hole (G2) with conductive material. A damascene wiring structure (10) having a high reliability and a semiconductor device having such a damascene wiring structure can be formed. <IMAGE> <IMAGE> <IMAGE> |
