Patent ID: 8614149

Claim:
A semiconductor device formed by a method for forming a feature in an etch layer, comprising: forming a photoresist layer over the etch layer; patterning the photoresist layer to form photoresist features with photoresist sidewalls, where the photoresist features have a first critical dimension; forming a control layer over the photoresist layer and bottoms of the photoresist features; depositing a conformal layer over the sidewalls of the photoresist features and control layer to reduce the critical dimensions of the photoresist features; breaking through openings in the control layer with a control layer breakthrough chemistry; and etching features into the etch layer with an etch chemistry, which is different from the control layer break through chemistry, wherein the etch layer features have a second critical dimension, which is less than the first critical dimension and wherein the control layer is more etch resistant to the etch with the etch chemistry than the conformal layer.