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Proceedings Paper

Advanced shrink material for NTD process with lower Y/X shrinkage bias of elongated patterns
Author(s): Yoshihiro Miyamoto; Takashi Sekito; John Sagan; Yuko Horiba; Takafumi Kinuta; Tatsuro Nagahara; Shinji Tarutani
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Paper Abstract

Negative tone shrink materials (NSM) suitable for resolution enhancement of negative tone development (NTD) 193nm immersion resists have been developed. While this technology is being expanded to integrated circuits (IC) manufacturing, there still have two major problems to apply various processes. One of them is shrink ID bias which means shrink differences between isolated (I) and dense (D) CDs, and the other one is Y/X shrinkage bias which means shrinkage differences between major axis (Y) and minor axis (X) of the elongated or oval shape pattern. While we have presented the improvement of shrink ID bias at SPIE2014 [1], the reduction of Y/X shrinkage bias was the examination theme for quite some time. In this paper, we present Y/X shrinkage bias of current NTD shrink material, new concept material for Y/X bias reduction and the result of new shrink material. Current NTD shrink model has Y/X bias of 1.6 (Y shrink=16nm) at a mixing bake (MB) of 150°C on AZ AX2110P NTD elongated pattern of X=70nm and Y=210nm ADI. This means shrinkage of Y has larger shrinkage than X and that makes difficult to apply shrink material. We expected that the characteristic shape of elongated pattern was one of the root-cause for Y/X bias, and then simulated how to achieve equivalent shrinkage at Y and X. We concluded that available resist volume per each Y and X unit was not equivalent and need new shrink concept to solve Y/X bias. Based on our new concept, we prepared new shrink material which has lower Y/X bias and larger shrink amount compared with current NTD shrink material. Finally we have achieved lower Y/X bias from 1.6 to 1.1 at MB150°C and moreover got higher shrinkage than current NTD shrink material from 10.1nm to 16.7nm.

Paper Details

Date Published: 20 March 2015
PDF: 6 pages
Proc. SPIE 9425, Advances in Patterning Materials and Processes XXXII, 942520 (20 March 2015); doi: 10.1117/12.2085736
Show Author Affiliations
Yoshihiro Miyamoto, Merck Performance Materials Manufacturing G.K. (Japan)
Takashi Sekito, Merck Performance Materials Manufacturing G.K. (Japan)
John Sagan, EMD Performance Materials Corp. (United States)
Yuko Horiba, Merck Performance Materials Manufacturing G.K. (Japan)
Takafumi Kinuta, Merck Performance Materials Manufacturing G.K. (Japan)
Tatsuro Nagahara, Merck Performance Materials Manufacturing G.K. (Japan)
Shinji Tarutani, Merck Performance Materials Manufacturing G.K. (Japan)

Published in SPIE Proceedings Vol. 9425:
Advances in Patterning Materials and Processes XXXII
Thomas I. Wallow; Christoph K. Hohle, Editor(s)

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