New multilayers of boron carbide/cerium dioxide (B4C/CeO2) combination on silicon (Si) substrate are manufactured to represent reflective-optics candidates for future lithography at 6.x nm wavelength. This is one of only a few attempts to make multilayers of this kind. Combination of several innovative experiments enables detailed study of optical properties, structural properties, and interface profiles of the multilayers in order to open up a room for further optimization of the manufacturing process. The interface profile is visualized by high-angle annular dark-field imaging which provides highly sensitive contrast to atomic number. Synchrotron based at-wavelength extreme ultraviolet (EUV) reflectance measurements near the boron (B) absorption edge allow derivation of optical parameters with high sensitivity to local atom interactions. X-ray reflectivity measurements at Cu-Kalpha ) determine the period of multilayers with high in-depth resolution. By combining these measurements and choosing robust nonlinear curve fitting algorithms, accuracy of the results has been significantly improved. It also enables a comprehensive characterization of multilayers. Interface diffusion is determined to be a major cause for the low reflectivity performance. Optical constants of B4C and CeO2 layers are derived in EUV wavelengths. Besides, optical properties and asymmetric thicknesses of inter-diffusion layers (interlayers) in EUV wavelengths near the boron edge are determined. Finally, ideal reflectivity of the B4C/CeO2 combination is calculated by using optical constants derived from the proposed measurements in order to evaluate the potentiality of the design.
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7 March 2016
Research Article|
March 01 2016
Deposition and characterization of B4C/CeO2 multilayers at 6.x nm extreme ultraviolet wavelengths
M. G. Sertsu
;
M. G. Sertsu
a)
1Department of Information Engineering,
University of Padova
, via Gradenigo 6B, 35131 Padova, Italy
2
CNR—IFN UOS Padova
, Via Trasea 7, 35131 Padova, Italy
3Experimental Physics of EUV, JARA-FIT,
RWTH Aachen University
, Steinbachstr. 15, 52074 Aachen, Germany
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A. Giglia;
A. Giglia
4
CNR- Istituto Officina Materiali
, I-34149 Trieste, Italy
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S. Brose;
S. Brose
5Chair for the Technology of Optical Systems (TOS), JARA-FIT,
RWTH Aachen University
, Steinbachstr. 15, 52074 Aachen, Germany
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D. Park;
D. Park
6Central Facility for Electron Microscopy (GFE), JARA-FIT,
RWTH Aachen University
, Ahornstr. 55, D-52074 Aachen, Germany
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Z. S. Wang;
Z. S. Wang
7
Institute of Precision Optics Engineering
, Tongji University, Shanghai 200092, China
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J. Mayer;
J. Mayer
6Central Facility for Electron Microscopy (GFE), JARA-FIT,
RWTH Aachen University
, Ahornstr. 55, D-52074 Aachen, Germany
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L. Juschkin;
L. Juschkin
3Experimental Physics of EUV, JARA-FIT,
RWTH Aachen University
, Steinbachstr. 15, 52074 Aachen, Germany
8
Peter Grünberg Institut (PGI-9)
, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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P. Nicolosi
P. Nicolosi
1Department of Information Engineering,
University of Padova
, via Gradenigo 6B, 35131 Padova, Italy
2
CNR—IFN UOS Padova
, Via Trasea 7, 35131 Padova, Italy
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J. Appl. Phys. 119, 095301 (2016)
Article history
Received:
December 11 2015
Accepted:
February 11 2016
Citation
M. G. Sertsu, A. Giglia, S. Brose, D. Park, Z. S. Wang, J. Mayer, L. Juschkin, P. Nicolosi; Deposition and characterization of B4C/CeO2 multilayers at 6.x nm extreme ultraviolet wavelengths. J. Appl. Phys. 7 March 2016; 119 (9): 095301. https://doi.org/10.1063/1.4942656
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