Patent ID: 6559067
Filing Date: 2003-05-06
Classification: G03F,H01L,Y10T

Abstract:
In a method for patterning an organic antireflection layer by DUV lithography followed by ARC open etching, which comprises:providing a substrate with a metal layer, a photoresist, and an antireflection layer as an intermediate layer of an organic polymer formed between the photoresist and the metal layer; etching the (ARC polymer) intermediate layer in a CF4 ARC open process with the following process parameters: CF435 . . . 45sccmCHF317 . . . 23sccmO25 . . . 7sccmArâ€‚80 . . . 120sccmPressureâ€‚80 . . . 120mtorrPower550 . . . 650Wattsâ€ƒand with high selectivity with respect to the photoresist; and subsequently etching the metal layer beneath the antireflection layer.