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Proceedings Paper

A study of storage life extension for high performance chemically amplified resist coated blanks
Author(s): Sin-Ju Yang; Sung-Min Seo; Sang-Hoon Ko; Han-Sun Cha; Geung-Won Kang; Kee-Soo Nam; Woong-Won Seo; Woo-Kyun Jung; Hyun-Kyoon Cho; Jin-Min Kim; Sang-Soo Choi
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Paper Abstract

The importance of advanced e-beam writing system and chemically amplified resist (CAR) coated blank is increasing gradually in high-end grade photomask manufacture according to CD embodiment of 90 nm and beyond technology node requiring because of the shrinkage of design rule in the semiconductor industry. However, many studies have been reported that CAR has several troubles and especially, CAR sensitivity change is occurred by airborne molecular contamination (AMC). So, the storage life of CAR coated blank is shortened. This problem may cause the difficulty of high-end grade photomask manufacture because it is hard to secure stable mean to target (MTT) and CD uniformity by sensitivity change, T-top profile and footing profile. Therefore, the purpose of this paper is to investigate the storage life extension for high performance CAR coated blank through improvement of the packing materials. Firstly, a variety of packing materials were collected and the selected packing materials were analyzed by Automatic Thermal Desorption Gas Chromatograph/Mass Spectrometer (ATD GC/MS) and Ion Chromatograph (IC) to examine AMC generated from the packing materials. As a result, molecular condensables such as alcohols, hydrocarbons and fatty acids were detected and molecular acids and molecular bases those are NH4+, Cl-, NOx- and SOx- were also detected from the packing materials, respectively. From the above results, we selected the best packing materials which generated the least AMC and the worst packing materials which generated the most AMC. Additionally, we verified photomask process with CAR coated blanks which were packed with those packing materials with post coating delay (PCD) by 50 kV e-beam writing system. In consequence, dose to clear (DTC) showed 4.6 μC/cm2 at 0 day PCD for both of the best and the worst packing materials of CAR coated blank. After 90 days PCD, DTC variation was only 0.4 μC/cm2 for the best packing materials, but DTC variation of 4.0 μC/cm2 showed in the worst packing materials. There was 10 times difference in DTC variation between the best and the worst packing materials. As well as, the CD variation at 0.5 μm dense line presented less than 5 nm movement for 90 days PCD.

Paper Details

Date Published: 28 June 2005
PDF: 11 pages
Proc. SPIE 5853, Photomask and Next-Generation Lithography Mask Technology XII, (28 June 2005); doi: 10.1117/12.617054
Show Author Affiliations
Sin-Ju Yang, S&S TECH Corp. (South Korea)
Sung-Min Seo, S&S TECH Corp. (South Korea)
Sang-Hoon Ko, S&S TECH Corp. (South Korea)
Han-Sun Cha, S&S TECH Corp. (South Korea)
Geung-Won Kang, S&S TECH Corp. (South Korea)
Kee-Soo Nam, S&S TECH Corp. (South Korea)
Woong-Won Seo, Photronics-PKL (South Korea)
Woo-Kyun Jung, Photronics-PKL (South Korea)
Hyun-Kyoon Cho, Photronics-PKL (South Korea)
Jin-Min Kim, Photronics-PKL (South Korea)
Sang-Soo Choi, Photronics-PKL (South Korea)

Published in SPIE Proceedings Vol. 5853:
Photomask and Next-Generation Lithography Mask Technology XII
Masanori Komuro, Editor(s)

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