Carbon film growth on model MLM cap layer: interaction of selected hydrocarbon vapor with Ru(10-10) surface

B. V. Yakshinskiy; R. A. Bartynski

doi:10.1117/12.846645

22 March 2010 Carbon film growth on model MLM cap layer: interaction of selected hydrocarbon vapor with Ru(10-10) surface

B. V. Yakshinskiy, R. A. Bartynski

Author Affiliations +

Proceedings Volume 7636, Extreme Ultraviolet (EUV) Lithography; 76360F (2010) https://doi.org/10.1117/12.846645
Event: SPIE Advanced Lithography, 2010, San Jose, California, United States

Abstract

The aim of this work is to explore the thermal and non-thermal interaction of toluene, benzene and isobutene vapor with a crystalline Ru(10-10) surface, a model surface for Ru capping layers used in EUV lithography. Our main objective is to provide insights into the basic processes that affect the reflectivity of Ru-coated Mo/Si multilayer mirrors that are exposed to EUV radiation. A low energy electron beam is employed to mimic excitations initiated by EUV radiation. Temperature programmed desorption (TPD), x-ray photoelectron spectroscopy (XPS), low energy ion scattering (LEIS), and electron-stimulated desorption (ESD) are used to analyze the surface reactions. Pyrolysis of a chemisorbed hydrocarbon layer on the Ru surface leads to the dehydrogenation and buildup a self-limited carbon monolayer. Carbon film growth on the Ru(10-10) crystalline surface under 100 eV electron bombardment in hydrocarbon vapor is measured over a range of pressures and temperatures near 300 K. The carbon growth rate is ~10 times higher in the presence of toluene vapor than in the presence of benzene or isobutene vapor. The estimations of the adsorption energy, the steadystate coverage of the molecules on the surface and the cross-sections for electron-stimulated dissociation are presented. A graphene-like carbon layer is probed as possible way to reduce the surface contamination rate.

Citation Download Citation

B. V. Yakshinskiy and R. A. Bartynski "Carbon film growth on model MLM cap layer: interaction of selected hydrocarbon vapor with Ru(10-10) surface", Proc. SPIE 7636, Extreme Ultraviolet (EUV) Lithography, 76360F (22 March 2010); https://doi.org/10.1117/12.846645

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