Characterization of HafSOx inorganic photoresists using electron stimulated desorption

Ryan T. Frederick; Gregory S. Herman

doi:10.1117/12.2220604

21 March 2016 Characterization of HafSOx inorganic photoresists using electron stimulated desorption

Proceedings Volume 9779, Advances in Patterning Materials and Processes XXXIII; 97790I (2016) https://doi.org/10.1117/12.2220604
Event: SPIE Advanced Lithography, 2016, San Jose, California, United States

Abstract

Inorganic resists are of interest for nanomanufacturing due to the potential for high resolution, low line width roughness, and high sensitivity. The combination of high absorption coefficient elements and radiation sensitive ligands can improve inorganic resist sensitivity while still allowing high contrast for extreme ultraviolet (EUV) lithography. A prototypical resist is Hf(OH)_4-2x-2y(O₂)_x(SO₄)_y·qH₂O (HafSOx), which has both high absorption coefficient elements (Hf) and radiation sensitive ligands (peroxides). Herein, we evaluate the use of electron stimulated desorption (ESD) to characterize HafSOx. These results indicate that the peroxo species are extremely radiation sensitive, even for low kinetic energy electrons that approximate the range of electron energies expected during EUV exposures. The primary desorption products from HafSOx are O₂ and H₂O, where the time evolution suggest much faster desorption kinetics for O₂. These data provide insight into the radiation-induced changes responsible for the solubility transition upon exposure and dissolution during development, and the role of low kinetic energy electrons in these processes. The following describes our experimental methodology for the ESD studies, and the specific kinetic model used to extract total desorption cross sections from the ESD data.

Citation Download Citation

Ryan T. Frederick and Gregory S. Herman "Characterization of HafSOx inorganic photoresists using electron stimulated desorption", Proc. SPIE 9779, Advances in Patterning Materials and Processes XXXIII, 97790I (21 March 2016); https://doi.org/10.1117/12.2220604

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