Patent ID: 7084065

Claim:
A method for fabricating a semiconductor device, the method comprising: a first process for forming a barrier insulating film which contains hydrogen atoms and an interlayer dielectric which includes an organic insulating film in order on a semiconductor substrate; a second process for making a first opening of a hole shaped pattern in the interlayer dielectric; a third process for making a second opening of a hole shaped pattern in the barrier insulating film which contains the hydrogen atoms by etching the barrier insulating film which contains the hydrogen atoms through the first opening in the interlayer dielectric; and a fourth process performed after the third process for removing fluoride which has attached to the barrier insulating film which contains the hydrogen atoms by the use of ammonia gas and for making a third opening of a wiring shaped pattern in the interlayer dielectric by use of ammonia gas so that at least part of the third opening will overlap with the first opening, wherein the fourth process is performed in the same chamber where the third process is performed, and is performed in an environment of a temperature below or at 0° C.; wherein in the third process the second opening is made so that the angle of a taper of the barrier insulating film will be smaller than or equal to 85 degrees, further wherein in the fourth process the fluoride which has attached to the barrier insulating film is removed so that the recession length of shoulders of the first opening and the third opening after making of the third opening will be shorter than or equal to 5 nm.