Patent ID: 6797552
Filing Date: 2004-09-28
Classification: H01L

Abstract:
A method for forming a semiconductor device comprising:providing a substrate having formed thereon a polysilicon layer, a lower amorphous carbon hardmask layer formed on the polysilicon layer, and an upper silicon oxynitride hardmask layer formed on the lower amorphous carbon hardmask layer; forming a photoresist mask on the upper silicon oxynitride hardmask layer; patterning the upper silicon oxynitride hardmask layer using the photoresist mask as an etch mask to form an upper hardmask; removing the photoresist mask; patterning the lower amorphous carbon hardmask layer using the upper hardmask as an etch mask to form a lower hardmask; and anisotropically patterning the polysilicon layer using the lower hardmask as an etch mask while introducing a source of passivation agents from an external source, wherein said patterning of the polysilicon layer does not utilize passivation agents emitted from a photoresist material during patterning of the polysilicon layer.