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Proceedings Paper

Characterization of resist flow process for the improvement of contact hole CD uniformity
Author(s): Cha-Won Koh; Dong-Ho Lee; Myoung-Soo Kim; Sung-Nam Park; Won-Taik Kwon
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Paper Abstract

We can print contact hole pattern beyond the optical resolution limit using resist flow process. But CD uniformity should be improved for its masse implementation because CD uniformity gets worser as shrink bias gets larger in resist flow process. For example, contact hole size of wafer edge region is larger by the amount of about 20nm than that of wafer center region. Contact hole CD uniformity depends on uniformity of wafer temperature to which bake oven temperature uniformity and atmosphere temperature uniformity surrounding the wafer in bake oven can affect. The air and exhaust have large effect on the temperature uniformity of atmosphere surrounding the wafer. And mechanical structure of bake oven has an influence on wafer temperature uniformity. So we tested CD uniformity according to types of middle cover in bake oven. We also investigated CD uniformity according to resist inherent characteristics concerning resist flow rate. We optimized resist flow process using two step flow system, which improves wafer CD uniformity by amount of 30% compared to one step resist flow process and considering resist thickness dependency. Device characteristics of chain resistance uniformity was enhanced by improving contact hole CD uniformity.

Paper Details

Date Published: 12 June 2003
PDF: 8 pages
Proc. SPIE 5039, Advances in Resist Technology and Processing XX, (12 June 2003); doi: 10.1117/12.485110
Show Author Affiliations
Cha-Won Koh, Hynix Semiconductor, Inc. (South Korea)
Dong-Ho Lee, Hynix Semiconductor, Inc. (South Korea)
Myoung-Soo Kim, Hynix Semiconductor, Inc. (South Korea)
Sung-Nam Park, Hynix Semiconductor, Inc. (South Korea)
Won-Taik Kwon, Hynix Semiconductor, Inc. (South Korea)

Published in SPIE Proceedings Vol. 5039:
Advances in Resist Technology and Processing XX
Theodore H. Fedynyshyn, Editor(s)

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