The optical, mechanical, and microstructural properties of single layers grown by ion beam sputtering have been investigated by spectrophotometric measurements, film stress characterization, x-ray photoelectron spectroscopy (XPS), x-ray diffraction, and transmission electron microscopy. The deposition conditions, using fluorine reactive gas or not, have been found to greatly influence the optical absorption and the stress of the films as well as their microstructure. The layers grown with fluorine compensation exhibit a regular columnar microstructure and an UV-optical absorption which can be very low, either as deposited or after thermal annealings at very low temperatures. On the contrary, layers grown without fluorine compensation exhibit a less regular microstructure and a high ultraviolet absorption which is particularly hard to cure. On the basis of calculations, it is shown that F centers are responsible for this absorption, whereas all the films were found to be stoichiometric, in the limit of the XPS sensitivity. On the basis of external data taken from literature, our experimental curves are analyzed, so we propose possible diffusion mechanisms which could explain the behaviors of the coatings.
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November 2000
Research Article|
November 01 2000
Optical and microstructural properties of UV coatings grown by ion beam sputtering process
E. Quesnel;
E. Quesnel
LETI/CEA-G-DOPT, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
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L. Dumas;
L. Dumas
LETI/CEA-G-DOPT, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
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D. Jacob;
D. Jacob
EME, Ingenierı́a y Materiales Electrónicos, Departamento de Electrónica, Universidad de Barcelona, Marti i Franquès, 1, E-08028 Barcelona, España
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F. Peiró
F. Peiró
EME, Ingenierı́a y Materiales Electrónicos, Departamento de Electrónica, Universidad de Barcelona, Marti i Franquès, 1, E-08028 Barcelona, España
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J. Vac. Sci. Technol. A 18, 2869–2876 (2000)
Article history
Received:
December 22 1999
Accepted:
July 10 2000
Citation
E. Quesnel, L. Dumas, D. Jacob, F. Peiró; Optical and microstructural properties of UV coatings grown by ion beam sputtering process. J. Vac. Sci. Technol. A 1 November 2000; 18 (6): 2869–2876. https://doi.org/10.1116/1.1290374
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