Progress of UV-NIL template making

Takaaki Hiraka; Jun Mizuochi; Yuko Nakanishi; Satoshi Yusa; Shiho Sasaki; Yasutaka Morikawa; Hiroshi Mohri; Naoya Hayashi

doi:10.1117/12.824342

11 May 2009 Progress of UV-NIL template making

Takaaki Hiraka, Jun Mizuochi, Yuko Nakanishi, Satoshi Yusa, Shiho Sasaki, Yasutaka Morikawa, Hiroshi Mohri, Naoya Hayashi

Author Affiliations +

Proceedings Volume 7379, Photomask and Next-Generation Lithography Mask Technology XVI; 73792S (2009) https://doi.org/10.1117/12.824342
Event: Photomask and NGL Mask Technology XVI, 2009, Yokohama, Japan

Abstract

Nano-imprint lithography (NIL) has been counted as one of the lithography candidates for hp32nm node and beyond and has showed excellent resolution capability with remarkable low line edge roughness that is attracting many researchers in the industry who were searching for the finest patterning technology. Therefore, recently we have been focusing on the resolution improvement on the NIL templates with the 100keV acceleration voltage spot beam (SB) EB writer and the 50keV acceleration voltage variable shaped beam (VSB) EB writer. The 100keV SB writers have high resolution capability, but they show fatally low throughput if we need full chip writing. Usually templates for resolution pioneers needed just a small field (several hundred microns square or so), but recently requirements for full chip templates are increasing. For full chip writing, we have also started the resolution improvement with the 50keV VSB writers used in current 4X photomask manufacturing. The 50keV VSB writers could generate full chip pattern in a reasonable time though resolution limits are inferior to that with the 100keV SB writers. In this paper, we will show latest results with both the 100keV SB and the 50keV VSB EB writers. With the 100keV SB EB writer, we have achieved down to hp15nm resolution for line and space pattern, but found that to achieve further improvement, an innovation in pattern generation method or material would be inevitable. With the 50keV VSB EB writer, we have achieved down to hp22nm resolution for line and space pattern. Though NIL has excellent resolution capability, solutions for defect inspection and repair are not clearly shown yet. In this paper, we will show preliminary inspection results with an EB inspection tool. We tested an EB inspection tool by Hermes Microvision, Inc. (HMI), which was originally developed for and are currently used as a wafer inspection tool, and now have been started to seek the application for mask use, using a programmed defect template.

Citation Download Citation

Takaaki Hiraka, Jun Mizuochi, Yuko Nakanishi, Satoshi Yusa, Shiho Sasaki, Yasutaka Morikawa, Hiroshi Mohri, and Naoya Hayashi "Progress of UV-NIL template making", Proc. SPIE 7379, Photomask and Next-Generation Lithography Mask Technology XVI, 73792S (11 May 2009); https://doi.org/10.1117/12.824342

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