Revisiting mask contact hole measurements

Masaru Higuchi; Emily Gallagher; Daniel Ceperley; Timothy Brunner; Reg Bowley; Anne McGuire

doi:10.1117/12.686957

20 October 2006 Revisiting mask contact hole measurements

Masaru Higuchi, Emily Gallagher, Daniel Ceperley, Timothy Brunner, Reg Bowley, Anne McGuire

Proceedings Volume 6349, Photomask Technology 2006; 634947 (2006) https://doi.org/10.1117/12.686957
Event: SPIE Photomask Technology, 2006, Monterey, California, United States

Abstract

Contact holes represent one of the biggest critical dimension (CD) mask metrology challenges for 45nm technology mask development. The challenge is a consequence of both wafer and mask sensitivities. Large mask error factors and the small process windows found when contact holes are imaged on wafers impose very tight mask specifications for CD uniformity. The resultant CD error budget leaves little room for mask metrology. Current advanced mask metrology deploys a CD-SEM to characterize the mask contact hole CD uniformity. Measuring a contact hole is complex since it is inherently two-dimensional and is not always well-characterized by one-dimensional x- and y-axis measurements. This paper will investigate contact metrics such as line edge roughness (LER), region of interest (ROI) size, area, and CD sampling methods. The relative merits of each will be explored. Ultimately, an understanding of the connection between what is physically measured on the mask and what impacts wafer imaging must be understood. Simulations will be presented to explore the printability of a contact hole's physical attributes. The results will be summarized into a discussion of optimal contact hole metrology for 45nm technology node masks.

Citation Download Citation

Masaru Higuchi, Emily Gallagher, Daniel Ceperley, Timothy Brunner, Reg Bowley, and Anne McGuire "Revisiting mask contact hole measurements", Proc. SPIE 6349, Photomask Technology 2006, 634947 (20 October 2006); https://doi.org/10.1117/12.686957

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