Patent ID: 8476002

Claim:
A method of forming a patterned mask, comprising: forming spaced-apart first features over a semiconductor material, the first features comprising a first material and having sidewalls; the first features being spaced from one another by gaps; forming a second material along the sidewalls of the first features; the second material being compositionally different from the first material; forming a third material over the second material and the first features; the third material being compositionally different from the second material; the third material having a topography which defines recesses over segments of the gaps; forming a pedestals within said recesses; the pedestals comprising fourth material which is compositionally different from the third material; removing some of the second material from within the gaps to pattern the second material into a plurality of second features along the sidewalls of the first features; and removing the first features and at least some of the third material to leave a patterned mask comprising the second features in combination with other features defined by the pedestals.