Patent ID: 6828237
Filing Date: 2004-12-07
Classification: H01L

Abstract:
A method for forming a patterned layer comprising:providing a substrate; forming over the substrate a blanket target layer; forming upon the blanket target layer a patterned mask layer; etching vertically incompletely the blanket target layer while employing a plasma etch method and the patterned mask layer as an etch mask to form an incompletely vertically etched blanket target layer and an etch residue layer upon a sidewall of the patterned mask layer; removing the patterned mask layer from the incompletely vertically etched blanket target layer; etching further the incompletely vertically etched blanket target layer while employing the plasma etch method to form a further etched incompletely vertically etched blanket target layer having formed thereupon a laterally increased etch residue layer; and etching further the further etched incompletely vertically etched blanket target layer while employing the plasma etch method and the laterally increased etch residue layer as an etch mask to form a patterned target layer.