Patent ID: 7985682

Claim:
A method of fabricating a semiconductor device, comprising: forming a first film on a processed film; patterning the first film into a pattern with a smaller width and a space with a larger width, thereby exposing an upper surface of the processed film; forming a second film along an upper surface and side surface of the first film and the upper surface of the processed film; etching the second film under a condition that the second film has a higher etch selectivity than the first film, thereby exposing the upper surfaces of the first film and the processed film while part of the second film remains along the side surface of the first film; etching the first film under a condition that the first film has a higher etch selectivity than the second film, so that an upper end of the first film is located lower than an upper end of the second film and so that the upper end of the first film is located higher than the processed film; etching an upper part of the second film under a condition that the upper part of the second film has a higher etch selectivity than the processed film, after the first film has been etched; removing the first film after the upper part of the second film has been etched; and etching the processed film with the second film serving as a mask after the first film has been removed.