The availability of defect-free masks remains one of the key challenges for inserting extreme ultraviolet lithography
(EUVL) into high volume manufacturing, yet little data is available for understanding native defects on real masks. In
this paper, a full-field EUV mask is fabricated to investigate the printability of various defects on the mask. The
printability of defects and identification of their source from mask fabrication to handling were studied using wafer
inspection. The printable blank defect density excluding particles and patterns is 0.63/cm2. Mask inspection is shown to
have better sensitivity than wafer inspection. The sensitivity of wafer inspection must be improved using through-focus
analysis and a different wafer stack.
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