Single-expose patterning development for EUV lithography
Anuja De Silva, Karen Petrillo, et al.
SPIE Advanced Lithography 2017
Extreme ultraviolet (EUV) patterning offers an opportunity to explore hardmask materials and patterning approaches. Traditional patterning stacks for deep ultraviolet patterning have been based on optimizing multilayer schemes for reflectivity control and pattern transfer. At the EUV wavelength, the patterning challenges are dominated by stochastics and aspect ratio control. This offers an opportunity to think differently about underlayer design for sub-36-nm pitch patterning. The choice of hardmask can be used to modulate postlitho defectivity to mitigate the stochastics effects and enable more efficient pattern transfer. Through different case studies this paper will explore a range of silicon-based inorganic hardmasks for sub-36-nm EUV patterning. How film properties dominate patterning performance will be studied systematically. The relative merits of patterning a chemically amplified organic resist directly on an inorganic hardmask or having different types of organic adhesion promoters as an intermediate layer will also be presented.
Anuja De Silva, Karen Petrillo, et al.
SPIE Advanced Lithography 2017
Anuja De Silva, Luciana Meli, et al.
SPIE Advanced Lithography 2019
Jing Guo, Anuja De Silva, et al.
SPIE Advanced Lithography 2018
Martin Burkhardt, Zheng Chen, et al.
OEN 2022