Patent ID: 6465272
Filing Date: 2002-10-15
Classification: B82Y,G02B,G03F,G21K,Y10S

Abstract:
A projection lithographic method for producing integrated circuits with printed feature dimensions less than 100 nm, said method comprising:providing an illumination sub-system for producing and directing an extreme ultraviolet soft x-ray radiation &lgr;, said illumination sub-system including an extreme ultraviolet soft x-ray source, providing a mask sub-system illuminated by said extreme ultraviolet soft x-ray radiation &lgr; produced by said illumination sub-system, providing a mask sub-system patterned reflective lithographic mask for forming a projected mask lithographic pattern when illuminated by said radiation &lgr;, said patterned reflective mask including a Ti doped SiO2 glass wafer with a patterned &lgr; absorbing overlay overlaying a &lgr; reflective multilayer coated Ti doped SiO2 glass defect-free wafer surface that has an Ra roughness&lE;0.15 nm, providing a projection sub-system, providing an integrated circuit wafer, said integrated circuit wafer having a &lgr; radiation sensitive wafer surface, and projecting with said projection sub-system the projected mask pattern from said patterned reflective mask onto said radiation sensitive wafer surface.