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Proceedings Paper

Printing characteristics of proximity x-ray lithography and comparison with optical lithography for 100-nm node and below
Author(s): Masaki Hasegawa; Yoshinori Nakayama; K. Yamaguchi; Tsuneo Terasawa; Yasuji Matsui
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Paper Abstract

Proximity X-ray Lithography (PXL) has been demonstrated to be powerful tool for fabricating patterns at the 130-nm technology node and to be extendable to the 70-nm node and below. On the other hand, the capabilities of optical lithography have now reached the 150-nm node, and it is widely discussed that it will be applicable to the 100- and 70-nm nodes. In this study, we have investigated the printing characteristics of PXL and compare them to those of ArF and F2 optical lithography for several model patterns of DRAMs, SRAMs, and logic devices at the 100- and 70-nm nodes. We used aerial image simulations and carried out PXL exposure experiments to confirm the simulation results. Both the aerial images and the exposure results show that PXL has sufficient resolution for patterns with a 100-nm design rule and offers a wide latitude in the proximity gap. For ArF and F2 lithography with a Levenson-type mask, the same patterns were resolved with a lower fidelity and the depth of focus (DOF) was less than 0.2 micrometer. No resolution enhancement techniques (RET), such as optical proximity correction (OPC) to masks, are required in PXL; but they are indispensable in optical lithography. At the 70-nm node, PXL provides acceptable resolution, even at a gap of 10 micrometer; and the simulations show that the resolution can be increased by setting the gap in the range of 5 - 10 micrometer.

Paper Details

Date Published: 21 July 2000
PDF: 9 pages
Proc. SPIE 3997, Emerging Lithographic Technologies IV, (21 July 2000); doi: 10.1117/12.390116
Show Author Affiliations
Masaki Hasegawa, Association of Super-Advanced Electronics Technologies (Japan)
Yoshinori Nakayama, Association of Super-Advanced Electronics Technologies (Japan)
K. Yamaguchi, Association of Super-Advanced Electronics Technologies (Japan)
Tsuneo Terasawa, Hitachi, Ltd. (Japan)
Yasuji Matsui, Association of Super-Advanced Electronics Technologies (Japan)

Published in SPIE Proceedings Vol. 3997:
Emerging Lithographic Technologies IV
Elizabeth A. Dobisz, Editor(s)

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