The Effect of Copper Content on the Formation of Silicon Suboxides Phases in Cu–Si Films Obtained by Ion-Beam Sputtering

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Resumo

Cu–Si systems are important for a wide range of technological applications. This work is devoted to the study of the influence of copper content on the formation of silicon oxide phases in Cu–Si films obtained by ion beam sputtering. According to X-ray diffraction and ultra-soft X-ray emission spectroscopy data in a film with a low copper content of ∼ 15 wt. % silicon is partially in an amorphous state, and partially oxidized, forming a SiO0.47 suboxide. In films with a high copper content, Cu ∼ 65 wt. % Cu3Si phase is formed, which leads to the formation of phases of SiO2 dioxide and SiO0.8 suboxide in both near-surface and deeper layers. X-ray photoelectron spectroscopy indicates the formation of predominantly silicon-oxygen tetrahedra of the Si-Si3O and SiO4 types for Cu ∼ 15 wt. % and more oxygen-rich Si-Si2O2 silicon-oxygen tetrahedra for Cu ∼ 65 wt. %, both on the surface and in deep layers of Cu–Si films.

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Sobre autores

K. Barkov

Voronezh State University

Autor responsável pela correspondência
Email: barkov@phys.vsu.ru
Rússia, Voronezh

V. Terekhov

Voronezh State University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

E. Kersnovsky

Voronezh State University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

I. Polshin

Voronezh State University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

S. Ivkov

Voronezh State University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

A. Chukavin

Voronezh State University; Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences

Email: barkov@phys.vsu.ru
Rússia, Voronezh; Izhevsk

S. Rodivilov

Research Institute of Electronic Technology

Email: barkov@phys.vsu.ru
Rússia, Voronezh

N. Buylov

Voronezh State University; Research Institute of Electronic Technology

Email: barkov@phys.vsu.ru
Rússia, Voronezh; Voronezh

D. Nesterov

Voronezh State University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

V. Pobedinsky

Voronezh State University; Research Institute of Electronic Technology

Email: barkov@phys.vsu.ru
Rússia, Voronezh; Voronezh

A. Pelagina

Voronezh State University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

K. Moiseev

Voronezh State University; Bauman Moscow State Technical University

Email: barkov@phys.vsu.ru
Rússia, Voronezh; Moscow

A. Nikonov

Voronezh State Technical University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

A. Sitnikov

Voronezh State Technical University

Email: barkov@phys.vsu.ru
Rússia, Voronezh

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2. Fig. 1. SEM images of the surface (a, c) and chipping (b, d) of Cu-Si films with Cu content ∼ 15 (a, b) and ∼ 65 wt% (c, d).

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3. Fig. 2. X-ray diffractograms from Cu-Si films with relative Cu content ∼ 15 (1) and 65 wt% (2), as well as polycrystalline silicon (3) and pure copper (4) standards. The most significant reflections are marked on the plots, with the correspondence to crystallographic planes and phases indicated. Reflections from the substrate are highlighted in grey.

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4. Fig. 3. X-ray emission spectra of SiL2,3 from Cu-Si film with Cu content ∼ 15 wt% obtained from layers at depths of 10 (1) and 60 nm (2), as well as spectra of amorphous silicon a-Si (3) and silicon suboxide SiO0.47 (4) etalons [43]. The dots show the experimental spectra, the solid red curves show the result of modelling based on the standards.

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5. Fig. 4. X-ray emission spectra of SiL2,3 from Cu-Si film with Cu content ∼ 65 wt% obtained from layers at depths of 10 (1) and 60 nm (2), as well as spectra of silicon dioxide SiO2 (3), silicon suboxide SiO0.8 (4) [43], and silicon silicide Cu3Si (5) [8]. Dots show experimental spectra, solid red curves show the result of modelling based on standards.

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6. Fig. 5. XRD spectra near the 2p Si lines from Cu-Si films with Cu content ∼ 15 (a, b) and ∼ 65 wt% (c, d) before (a, c) and after (b, d) Ar+ ion beam etching.

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