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Proceedings Paper

Shot overlap model-based fracturing for edge-based OPC layouts
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Paper Abstract

In this paper, we develop a novel fracturing algorithm with shot overlap that is tailored towards rectilinear masks, such as those generated via edge based OPC software. Our proposed fracturing algorithm generates both the location and dosage of shots given the mask layout and mask making parameters. In the first step we heuristically cover the mask polygon with overlapping shots. Next, we incorporate the forward scattering and resist model in a least squares problem to compute the best dosage for all shots. Finally, we update the locations of the shot edges by computing the edge placement error between our simulated contour and the desired contour. One unique feature of our algorithm is that it can readily trade off between edge placement error and shot count by adjusting two input parameters. Compared to a commercially available non-overlapping shot software package, for a 400μm×400μm micron SRAM unit with about 1 million polygons, our algorithm results in a 23% reduction in shot count, while increasing the weighted average EPE from 0.7 to 1 nanometers.

Paper Details

Date Published: 31 March 2014
PDF: 19 pages
Proc. SPIE 9052, Optical Microlithography XXVII, 90520L (31 March 2014); doi: 10.1117/12.2046650
Show Author Affiliations
Shangliang Jiang, Univ. of California, Berkeley (United States)
Avideh Zakhor, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 9052:
Optical Microlithography XXVII
Kafai Lai; Andreas Erdmann, Editor(s)

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