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Journal of Micro/Nanolithography, MEMS, and MOEMS

Contact hole formation by multiple exposure technique in ultralow k1 lithography
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Paper Abstract

The double line and space (L&S) formation method with L&S masks and dipole illumination was found to have high capability to fabricate ~0.3 k1 contact hole (C/H) pattern. The procedure was as follows. The first L&S pattern was formed and was hardened to avoid the dissolution and mixing during the second resist coating. The second L&S pattern perpendicular to the first one was formed on the first resist pattern. The common space area of the two patterns became 1:1 C/H pattern. Simulation results showed that the double L&S formation method has much wider lithography latitude than other methods, such as single exposure of a C/H mask with quadrupole illumination, single exposure of a vortex mask with conventional illumination, and double exposure of L&S masks with dipole illumination to a single-layer resist. A 75 nm (0.30 k1) 1:1 C/H pattern was fabricated. An 80 nm (0.32 k1) 1:1 C/H pattern had 280 and 600 nm depth of focus in each resist layer at 8% exposure latitude. Moreover, a new method, in which a C/H mask replaces the L&S masks, is proposed to achieve cost reduction and the same high performance as the L&S masks.

Paper Details

Date Published: 1 April 2005
PDF: 8 pages
J. Micro/Nanolith. 4(2) 023005 doi: 10.1117/1.1899324
Published in: Journal of Micro/Nanolithography, MEMS, and MOEMS Volume 4, Issue 2
Show Author Affiliations
Hiroko Nakamura, Toshiba Corp. (Japan)
Yasunobu Onishi, Toshiba Corp. (Japan)
Kazuya Sato, Toshiba Corp. (Japan)
Satoshi Tanaka, Toshiba Corp. (Japan)
Shoji Mimotogi, Toshiba Corp. (Japan)
Koji Hashimoto, Toshiba Corp. (Japan)
Soichi Inoue, Toshiba Corp. (Japan)

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