High-NA EUV mask pattern characterization using advanced mask CD-SEM metrology

Development of High-NA EUV scanners is maturing and reached the stage of first exposures. Due to the anamorphic 0.55 NA optics, High-NA EUV masks are designed at (4x,-8x) magnification compared to wafer scale (X,Y). Consequently, while dimensions further shrink in X-direction on mask, they relax in Y-direction, resulting in asymmetric mask patterns and new mask perceptions. In this paper, we present a CD-based characterization for a variety of generic patterns on a state-of-the-art High-NA EUV mask, with emphasis on feature dimensions which are specifically relevant to High-NA EUV lithography. The mask metrology is done using an Advantest E3650 mask CD-SEM at imec, with image capture and metrology settings optimized for EUV masks. Besides providing insight into achievable pitches, we touch upon CD linearity for line-space patterns on mask, local roughness and non-uniformity at different length scales, and include a simulation to discuss the transfer of mask variability to wafer variability for a dense contact hole case. Another important aspect which we highlight in this study, is related to the effect of CD errors on mask. Namely, because of the anamorphic imaging, an X/Y symmetric CD offset on mask will lead to asymmetric CD errors at wafer level which can no longer be absorbed e.g. by choice of exposure dose. To avoid these asymmetries at wafer level, it is important to make sure that the mask is well targeted. The latter, however, also depends on choices in metrology settings, which may be 'historic defaults' and based on larger dimensions on DUV masks, yet applied to (High-NA) EUV masks. We therefore appeal to mask vendors for a careful verification of metrology settings applied for measurement on (High-NA) EUV masks.