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

Title
Influence of non-uniform intensity distribution of deformed pellicle for N7 patterning
Author
오혜근
Keywords
CD uniformity; EUV lithography; Pellicle; Pellicle deformation
Issue Date
2016-09
Publisher
SPIE
Citation
Proceedings of SPIE - The International Society for Optical Engineering, v. 9985, Page. 1-8
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.
URI
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9985/1/Influence-of-non-uniform-intensity-distribution-of-deformed-pellicle-for/10.1117/12.2242999.full?SSO=1http://repository.hanyang.ac.kr/handle/20.500.11754/69308
ISSN
0277-786X
DOI
10.1117/12.2242999
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > APPLIED PHYSICS(응용물리학과) > Articles
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