Patent ID: 8809169

Claim:
A method of patterning a substrate, the method comprising: a) forming a sacrificial film over a substrate; b) creating a pattern in the sacrificial film; c) sequentially first, conformally depositing a first spacer layer over the patterned sacrificial film, and second, removing at least one horizontal portion of the first spacer layer while substantially leaving vertical portions of the first spacer layer; d) removing portions of the sacrificial film not overlaid by the remaining portions of the first spacer layer; e) sequentially first, conformally depositing a second spacer layer over the remaining portions of the sacrificial film and the remaining portions of the first spacer layer, and second, removing at least one horizontal portion of the second spacer layer while substantially leaving vertical portions of the second spacer layer; f) optionally repeating c) and e) one or more times; g) optionally repeating c); and h) removing one of the first or second spacer layers while substantially leaving the vertical portions of the remaining one of the first or second spacer layers.