Patterning With EUV Lithography Without Photoresists

A technical paper titled “Resistless EUV lithography: photon-induced oxide patterning on silicon” was published by researchers at Paul Scherrer Institute, University College London, ETH Zürich, and EPFL.

Abstract:

“In this work, we show the feasibility of extreme ultraviolet (EUV) patterning on an HF-treated Si(100) surface in the absence of a photoresist. EUV lithography is the leading lithography technique in semiconductor manufacturing due to its high resolution and throughput, but future progress in resolution can be hampered because of the inherent limitations of the resists. We show that EUV photons can induce surface reactions on a partially H-terminated Si surface and assist the growth of an oxide layer, which serves as an etch mask. This mechanism is different from the H-desorption in scanning tunneling microscopy-based lithography. We achieve SiO2/Si gratings with 75 nm half-pitch and 31 nm height, demonstrating the efficacy of the method and the feasibility of patterning with EUV lithography without the use of a photoresist. Further development of the resistless EUV lithography method can be a viable approach to nm-scale lithography by overcoming the inherent resolution and roughness limitations of photoresist materials.”

Find the technical paper here. Published April 2023.

Li-Ting Tseng et al. ,Resistless EUV lithography: Photon-induced oxide patterning on silicon.Sci. Adv.9,eadf5997(2023).DOI:10.1126/sciadv.adf5997.

Related Reading
Assist Layers: The Unsung Heroes Of EUV Lithography
Various materials work in concert with the scanner, photoresist and photomasks to make EUV lithography work.
High-NA Lithography Starting To Take Shape
First systems built, with production planned for 2025; hyper-NA to follow next decade.

Source: https://semiengineering.com/patterning-with-euv-lithography-without-photoresists/

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