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Proceedings Paper

Ion-beam sputter deposition of x-ray multilayer optics on large areas
Author(s): Peter Gawlitza; Stefan Braun; Sebastian Lipfert; Andreas Leson
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Paper Abstract

Most important requirements for the deposition of x-ray optical multilayers are a) using a stable and reproducible deposition technique and b) to find growth conditions where the interfaces between adjacent layers are abrupt (no interdiffusion σd) and smooth (no roughness σr). The interface width σ (σ2 = σd 2 + σr 2) becomes increasingly important for smaller period thicknesses. Furthermore, the kinetic energies of the condensing particles on the substrate surface are of special importance for the interface formation. The ion beam sputter deposition technique (IBSD) provides stable and well adjustable particle energies combined with medium to high deposition rates allowing the fabrication of precise multilayer stacks for x-ray optical applications. We will present our newly installed large area IBSD facility with 400 x 100 mm2 linear ion sources and substrate sizes of up to 200 mm diameter (circular) or 500 x 100 mm2 (rectangular) and its characteristics concerning thickness homogeneity and process stability. First experimental results of metal/non-metal multilayer depositions with thickness uniformities of 99,9% over the entire substrate area are discussed. Different material combinations (Ni/B4C, Ni/C, Mo/Si) with period thicknesses between 2 nm and 10 nm have been fabricated and characterized by x-ray and EUV reflectometry. Interface widths are typically in the order of 0.3 nm. For the Ni-based multilayers Cu-Kα reflectances of R > 80 % can be obtained with period thicknesses dP greater than or equal to 2.5 nm (Ni/B4C) and dP greater than or equal to 3.0 nm (Ni/C). EUV reflectances of the Mo/Si multilayers are as high as R = 68,0 % at λ = 13,5 nm (incidence angle α = 5 deg).

Paper Details

Date Published: 11 September 2006
PDF: 9 pages
Proc. SPIE 6317, Advances in X-Ray/EUV Optics, Components, and Applications, 63170G (11 September 2006); doi: 10.1117/12.680618
Show Author Affiliations
Peter Gawlitza, Fraunhofer Institute for Material and Beam Technology (Germany)
Stefan Braun, Fraunhofer Institute for Material and Beam Technology (Germany)
Sebastian Lipfert, Fraunhofer Institute for Material and Beam Technology (Germany)
Andreas Leson, Fraunhofer Institute for Material and Beam Technology (Germany)

Published in SPIE Proceedings Vol. 6317:
Advances in X-Ray/EUV Optics, Components, and Applications
Ali M. Khounsary; Christian Morawe, Editor(s)

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