Patent ID: 7029803
Filing Date: 2006-04-18
Classification: C23C,G03F

Abstract:
1. An attenuating phase shift mask for use in lithography, comprising a substrate and a thin film system on one surface of said substrate; said thin film system comprising: a phase shift layer comprising a phase shift control sublayer and a transmission control sublayer; said phase shift mask being suitable for use in producing a photomask with substantially 180° phase shift and an optical transmission of at least 0.001% at an exposure light having a wavelength of 200 nm or less; wherein said thin film system is essentially free of defects having a particle size of 0.5 μm or more, and said transmission control sublayer comprises a material selected from the group consisting of Mg, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Zn, Ge, Sn, Pb, nitrides thereof and mixtures of two or more of these metals or nitrides.