Patent ID: 11880130
Assignee: HOYA CORPORATION
Field: Optics (Instruments)
Classification: CPC G  C | IPC G

Claim 9:
10. A reflective mask comprising:
a substrate;
a multilayer reflective film formed above the substrate; and
a phase shift film formed above the multilayer reflective film, the phase shift film having a pattern,
wherein the phase shift film comprises an alloy having at least two metal elements, the at least two metal elements including at least one metal element from a Group A and at least one metal element from a Group B,
wherein the metal elements in the Group A are Pd, Ag, Pt, Au, Ir, W, Cr, Mn, Sn, V, Fe and Hf,
wherein the metal elements in the Group B are Rh, Ru, Mo, Nb, Zr and Y, and
wherein the phase shift film has a refractive index of approximately between 0.877 to 0.940 and an extinction coefficient of approximately between 0.014 to 0.052 for wavelength of 13.5 nm.