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Proceedings Paper

Influence of non-uniform intensity distribution of deformed pellicle for N7 patterning
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Paper Abstract

For protecting mask from debris, EUV pellicle is considered as a most effective solution. EUV pellicle can avoid contamination on mask by covering mask. Usage of EUV pellicle can reduce mask damage caused by contamination but the pellicle involves transmission loss due to absorption of EUV light. To get high transmission, pellicle made with thin thickness but it can be deformed easily due to weak structure. Deformation of pellicle such as wrinkle leads transmission non-uniformity and transmission non-uniformity will involve CD non-uniformity. For real-application at lithography process, the optical study of deformed pellicle is required to avoid degradation of CD uniformity. In this paper, we discuss transmission non-uniformity with various off-axis-illumination (OAI) conditions. Then we studied CD nonuniformity caused by wrinkled pellicle with various patterns. By increasing spatial coherence, transmission nonuniformity is decrease at small wrinkle region. However, transmission non-uniformity variation is independent with illumination conditions at large wrinkle which has large period. Not only wrinkled pellicle imaging but also CD variation caused by non-uniform transmission is also dependent on illumination conditions. In contrast with transmission nonuniformity, CD non-uniformity with high coherent light is smaller than the result with low coherent light. With all of results, we find that the allowable local tilt angle is varied with wrinkle size and illumination conditions and smallest size of allowable local tilt angle is about 250 mrad for both illuminations.

Paper Details

Date Published: 26 September 2016
PDF: 8 pages
Proc. SPIE 9985, Photomask Technology 2016, 99850G (26 September 2016); doi: 10.1117/12.2242999
Show Author Affiliations
In-Seon Kim, Hanyang Univ. (Korea, Republic of)
Guk-Jin Kim, Hanyang Univ. (Korea, Republic of)
Michael Yeung, Fastlitho Inc. (United States)
Eytan Barouch, Boston Univ. (United States)
Min-Su Kim, Hanyang Univ (Korea, Republic of)
Jin-Goo Park, Hanyang Univ (Korea, Republic of)
Hye-Keun Oh, Hanyang Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 9985:
Photomask Technology 2016
Bryan S. Kasprowicz; Peter D. Buck, Editor(s)

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