Patent ID: 7670957

Claim:
A method of fabricating a semiconductor device, comprising: sequentially forming etch target layers, a hard mask layer and an anti-reflective coating layer; selectively etching the anti-reflective coating layer and the hard mask layer using gases generating polymers, thereby increasing a line width of a bottom portion of the hard mask layer due to the polymers; and etching the etch target layers using the hard mask layer with the increased line width, wherein selectively etching the hard mask layer includes using a gas mixture including at least one of CF 4 and CHF 3 with at least one of N x H y gas and C x H y gas, wherein x and y represent atomic ratios and are positive numbers, and wherein selectively etching the anti-reflective coating layer and the hard mask layer includes implementing a process condition that a temperature of a top electrode is different from a temperature of a bottom electrode to make sidewalls of the anti-reflective coating layer and the hard mask layer have a sloped profile.