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Proceedings Paper

Novel method for quality assurance of two-dimensional pattern fidelity and its validation
Author(s): Shimon Maeda; Ryuji Ogawa; Seiji Shibazaki; Tadashi Nakajima
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Paper Abstract

This paper proposes an evaluation pattern generating method that realizes stable printing for any two-dimensional feature. Below 65nm design node, even in the case of using the most advanced optical techniques, the resolution limit is approached. As a result, patterning fidelity to the target worsens in low k1 lithography conditions. Complex layout patterns, especially two-dimensional features, become increasingly sensitive to photo-resist bridging and necking. This means that the need for rich two-dimensional patterns is increasing in order to cope with lithographic patterning fidelity issues, such as quality assurance of OPC script and establishment of the design rule. A new pattern generating method reported in this paper can provide plenty of two-dimensional patterns by employing the Monte Carlo method. It can also take the design rule checker into account to present patterns without any design rule violation. In addition, to narrow significant generated patterns down to the real efficient patterns, some devices are employed. More than 2000 feature variations of feature can be generated in less than half day by this new method. To determine the efficacy of two-dimensional patterns generated by this method, some examples are provided. We have validated the efficiency of extracted patterns by employing some devices, and get quality assurance of our OPC script with the generated pattern features. It is shown that the proposed method is significantly efficient for detecting hotspots that are unfaithful to the target with low k1 factor.

Paper Details

Date Published: 12 May 2007
PDF: 11 pages
Proc. SPIE 6607, Photomask and Next-Generation Lithography Mask Technology XIV, 66070M (12 May 2007); doi: 10.1117/12.728936
Show Author Affiliations
Shimon Maeda, Toshiba Corp. Semiconductor Co. (Japan)
Ryuji Ogawa, Toshiba Corp. Semiconductor Co. (Japan)
Seiji Shibazaki, Toshiba Microelectronics Corp. (Japan)
Tadashi Nakajima, Toshiba Information Systems Corp. (Japan)

Published in SPIE Proceedings Vol. 6607:
Photomask and Next-Generation Lithography Mask Technology XIV
Hidehiro Watanabe, Editor(s)

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