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Proceedings Paper

Analysis of in-field uniformity on wafer considering exposure margin and MEEF
Author(s): Byung-Cheol Cha; Seong-Yoon Kim; Soon-Ho Kim; Sang-Yong Yu; Chan-Uk Jeon; Hee-Sun Yoon; Woo-Sung Han
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Paper Abstract

In this article, we analyzed in-field uniformity (IFU) on wafer considering exposure margin [linewidth variation (nm) per % exposure dose variation (%)] and the MEEF (mask error enhancement factor). As gate linewidth becomes smaller, the controllability of in-field uniformity (IFU) plays a key role in wafer manufacturing yield. IFU depends on various lithography parameters including mask CD (critical dimension) uniformity, MEEF, exposure margin, focus margin, transmittance, flare and illumination uniformity. In real world, the combination of wafer exposure machine and mask characteristics should be carefully considered to achieve better IFU on wafer. This presentation discusses the various experimental works including CD uniformity on mask, IFU on wafer, MEEF, exposure margin and wafer exposure machine. CD uniformity data on mask and IFU data on wafer is obtained from optical measurement tool to reduce measurement error disregarding local CD variation. Even though one handles a unit pattern, various MEEF exists in a unit pattern in case of complex pattern. In addition, the MEEF varying with the area across one mask degrades IFU on a wafer. IFU on a wafer is predictable using mask CD uniformity and exposure margin mean. Variation of exposure margin is the measure of stability of photo process. In manufacturing devices, mask and Litho. Tool should be well harmonized to achieve better IFU and a higher manufacturing yield. The photo process including resist process should be well controlled to get stability, as well as mask CD uniformity.

Paper Details

Date Published: 6 December 2004
PDF: 9 pages
Proc. SPIE 5567, 24th Annual BACUS Symposium on Photomask Technology, (6 December 2004); doi: 10.1117/12.569383
Show Author Affiliations
Byung-Cheol Cha, Samsung Electronics Co., Ltd. (South Korea)
Seong-Yoon Kim, Samsung Electronics Co., Ltd. (South Korea)
Soon-Ho Kim, Samsung Electronics Co., Ltd. (South Korea)
Sang-Yong Yu, Samsung Electronics Co., Ltd. (South Korea)
Chan-Uk Jeon, Samsung Electronics Co., Ltd. (South Korea)
Hee-Sun Yoon, Samsung Electronics Co., Ltd. (South Korea)
Woo-Sung Han, Samsung Electronics Co., Ltd. (South Korea)


Published in SPIE Proceedings Vol. 5567:
24th Annual BACUS Symposium on Photomask Technology
Wolfgang Staud; J. Tracy Weed, Editor(s)

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