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Proceedings Paper

Mask design optimization for 70-nm technology node using chromeless phase lithography (CPL) based on 100% transmission phase shifting mask
Author(s): J. Fung Chen; Douglas J. Van Den Broeke; Michael Hsu; Thomas L. Laidig; Kurt E. Wampler; Xuelong Shi; Stephen Hsu; Ted Shafer
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Paper Abstract

Chromeless phase lithography (CPL, or previously named CLM) is based on using 100 percent transmission PSM in the critical patterning area. However, unlike the conventional single chromeless phase edge type, CPL forms pattern images based on a pair of symmetrical phase-edges in proximity. In principle, the mask pattern layout is very similar to attenuated phase shift mask. There is no need to be concerned with neither phase assignment nor phase conflict. The mask layout complexity is greatly reduced as compared to the requirement for alternating PSM. In this report, we discuss how to optimize CPL mask design for a full-chip application. One effective method is by applying chrome patches or 'chrome shields' on top of the optically sensitive pattern areas. In 'large' 100 percent phase transmission areas, the chrome shield can prevent printing an undesirable pattern. As for the 'critical' pattern areas, chrome shields can be effectively used for controlling optical proximity effects in order to enhance the printing performance. We found chrome scattering bar (SB) OPC is necessary to improve process window. Using LithoCruiser simulation, we predict that it is possible to obtain manufacturable overlapped-process-window across a full range of feature pitch for 70nm line CD target with ArF exposure.

Paper Details

Date Published: 23 April 2002
PDF: 12 pages
Proc. SPIE 4754, Photomask and Next-Generation Lithography Mask Technology IX, (23 April 2002); doi: 10.1117/12.476927
Show Author Affiliations
J. Fung Chen, ASML MaskTools (United States)
Douglas J. Van Den Broeke, ASML MaskTools (United States)
Michael Hsu, ASML MaskTools (United States)
Thomas L. Laidig, ASML MaskTools (United States)
Kurt E. Wampler, ASML MaskTools (United States)
Xuelong Shi, ASML MaskTools (United States)
Stephen Hsu, ASML MaskTools (United States)
Ted Shafer, ASML MaskTools (United States)

Published in SPIE Proceedings Vol. 4754:
Photomask and Next-Generation Lithography Mask Technology IX
Hiroichi Kawahira, Editor(s)

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