Patent ID: 7122900

Claim:
A semiconductor device comprising: a substrate in which semiconductor elements are formed; metal wiring for interconnecting the semiconductor elements; and an insulative diffusion barrier layer directly covering at least a portion of the metal wiring, wherein at least a portion of the surface on the periphery of the metal wiring has a region made of a material comprising copper as a main ingredient, a portion of the region made of the material comprising copper as the main ingredient is in contact with the insulative diffusion barrier layer, the insulative diffusion barrier layer is formed to have a dielectric being 5 or less, a leak current at a test temperature of 140° C., under an electric field strength of 2 MV/cm being 10 nA or less per 1 cm 2 , and a dielectric breakdown lifetime when copper is used as an anode at a temperature of 140° C. being at least 100 years, and the insulative diffusion barrier layer has oxygen, silicon and nitrogen as main constituent elements, a concentration of the nitrogen being from 0.5 to 12.5 atm %.