Nonlinearity of current-voltage characterustics of diamond-like carbon thin films with nikel impurity

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Abstract

The current-voltage characteristics for Pt/DLC/Pt structures based on thin (40 nm) diamond-like carbon (DLC) films with Ni impurity have been studied at room temperature. The films were synthesized in the hallow Ni-cathode discharge from the mixture of argon and propane at simultaneous deposition of the DLC and Ni. The Ni concentration (10, 20 and 40 at. %) was controlled by variation of the propane portion (reactive gas) in plasma forming gas (argon) in the range of C3H8: Ar ~ 1:(1000…7000). Nonlinearity of the conductance G dependence on transverse voltage V agrees with Frenkel–Paul model: G ∝ exp(AV1/2). Observed decrease of the ln(G) - V1/2 dependence slope with increase of the Ni content was connected with increase of the DLC(Ni) dielectric permeability. Percolation threshold corresponds to Ni concentration of ~ 20 at.%.

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About the authors

A. S. Vedeneev

Kotelnikov Institute Radioengineering and Electronics RAS

Author for correspondence.
Email: asv335@fireras.su

Fryazino Branch

Russian Federation, Vvedenskogo Squar. 1, Fryazino, Moscow region, 141190

A. M. Kozlov

Kotelnikov Institute Radioengineering and Electronics RAS

Email: asv335@fireras.su

Fryazino Branch

Russian Federation, Vvedenskogo Squar. 1, Fryazino, Moscow region, 141190

D. V. Kolodko

Kotelnikov Institute Radioengineering and Electronics RAS

Email: asv335@fireras.su

Fryazino Branch

Russian Federation, Vvedenskogo Squar. 1, Fryazino, Moscow region, 141190

V. A. Luzanov

Kotelnikov Institute Radioengineering and Electronics RAS

Email: asv335@fireras.su

Fryazino Branch

Russian Federation, Vvedenskogo Squar. 1, Fryazino, Moscow region, 141190

I. A. Sorokin

Kotelnikov Institute Radioengineering and Electronics RAS

Email: asv335@fireras.su

Fryazino Branch

Russian Federation, Vvedenskogo Squar. 1, Fryazino, Moscow region, 141190

A. S. Bugaev

Kotelnikov Institute Radioengineering and Electronics RAS; Moscow Institute of Physics and Technology (National Research University)

Email: asv335@fireras.su

Fryazino Branch

Russian Federation, Vvedenskogo Squar. 1, Fryazino, Moscow region, 141190; Institutskii Lane, 9, Dolgoprudny, Moscow region, 141700

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Supplementary files

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2. Fig. 1. Dependence of the percentage content of nickel in DLC(Ni) and the film growth rate on the ratio of partial pressures of argon and propane.

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3. Fig. 2. Volt-ampere characteristics of Pt/DLC(Ni)/Pt structures with different nickel concentrations: 10 (1), 20 (2), 40 at.% (3).

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4. Fig. 3. Dependence of conductance G on |V |1/2 at different nickel concentrations: 10 (1), 20 (2), 40 at.% (3).

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5. Fig. 4. Dependence of resistance of Pt/DLC(Ni)/Pt structures on Ni content.

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