Optimal proximity correction: application for flash memory design

Y. O. Chen; D. L. Huang; K. T. Sung; J. J. Chiang; M. Yu; F. Teng; Lung Chu; Juan C. Rey; Douglas A. Bernard; Jiangwei Li; Junling Li; V. Moroz; Victor V. Boksha

doi:10.1117/12.310822

29 June 1998 Optimal proximity correction: application for flash memory design

Y. O. Chen, D. L. Huang, K. T. Sung, J. J. Chiang, M. Yu, F. Teng, Lung Chu, Juan C. Rey, Douglas A. Bernard, Jiangwei Li, Junling Li, V. Moroz, Victor V. Boksha

Author Affiliations +

Proceedings Volume 3334, Optical Microlithography XI; (1998) https://doi.org/10.1117/12.310822
Event: 23rd Annual International Symposium on Microlithography, 1998, Santa Clara, CA, United States

Abstract

Proximity Correction is the technology for which the most of IC manufacturers are committed already. The final intended result of correction is affected by many factors other than the optical characteristics of the mask-stepper system, such as photoresist exposure, post-exposure bake and development parameters, etch selectivity and anisotropy, and underlying topography. The most advanced industry and research groups already reported immediate need to consider wafer topography as one of the major components during a Proximity Correction procedure. In the present work we are discussing the corners rounding effect (which eventually cause electrical leakage) observed for the elements of Poly2 layer for a Flash Memory Design. It was found that the rounding originated by three- dimensional effects due to variation of photoresist thickness resulting from the non-planar substrate. Our major goal was to understand the reasons and correct corner rounding. As a result of this work highly effective layout correction methodology was demonstrated and manufacturable Depth Of Focus was achieved. Another purpose of the work was to demonstrate complete integration flow for a Flash Memory Design based on photolithography; deposition/etch; ion implantation/oxidation/diffusion; and device simulators.

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Y. O. Chen, D. L. Huang, K. T. Sung, J. J. Chiang, M. Yu, F. Teng, Lung Chu, Juan C. Rey, Douglas A. Bernard, Jiangwei Li, Junling Li, V. Moroz, and Victor V. Boksha "Optimal proximity correction: application for flash memory design", Proc. SPIE 3334, Optical Microlithography XI, (29 June 1998); https://doi.org/10.1117/12.310822

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