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Relation between carriers hopping rate and structural constants in amorphous carbon nickel films with different nickel nanoparticles distributions

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Abstract

In this paper, the films were prepared by radio frequency magnetron co-sputtering technique. The effect of different mosaic targets made of nickel strips and graphite pure on the dielectric relaxation time, the carriers hopping rate, the fractal dimensions and the optical loss of films were studied. The values of the optical band gap of films using the cross-point between the tangent of the plot of lower and higher values of the photon energy were calculated. The films deposited at 4.64% have maximum hopping rate of about 8.6 × 1012 S−1. It can be seen that the films deposited at 3.92% have minimum value of fractal dimension of 2.27. With increasing Ni content of films a nonmetal–metal transition is observed which it is explainable by the power law of percolation theory. Critical metal content and the critical exponent of films were 87.25% and 1, respectively. With increasing Ni content, the carriers effective mass of films decreased and average lattice separation values of films increased. Films deposited at 3.92% have minimum value of Debye frequency νD of about 1.09 × 1012 Hz. The value of energy loss by free charge carriers when traversing the bulk and surface of films at 3.92% has maximum value and it has an increasing function behavior with energy.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Malayer University, Malayer, Iran

    Nastaran Asareh & Vali Dalouji

  2. Young Researchers and Elite Club, West Tehran Branch, Islamic Azad University, Tehran, Iran

    Shahram Solaymani

  3. Department of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Sahar Rezaee

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  1. Nastaran Asareh
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  2. Vali Dalouji
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  3. Shahram Solaymani
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  4. Sahar Rezaee
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Correspondence to Vali Dalouji.

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Asareh, N., Dalouji, V., Solaymani, S. et al. Relation between carriers hopping rate and structural constants in amorphous carbon nickel films with different nickel nanoparticles distributions. Opt Quant Electron 51, 373 (2019). https://doi.org/10.1007/s11082-019-2087-2

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