Electrical conduction mechanism in laser deposited amorphous carbon

Miyajima, Yoji; Shannon, John M.; Henley, Simon J.; Stolojan, Vlad; Cox, D. C.; Silva, S. Ravi P.

doi:10.1016/j.tsf.2007.06.064

Cited by 19 publications

(22 citation statements)

References 17 publications

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“…[26] This value is within those predicted on the Poole-Frenkel model. [27][28][29] The difference in the carrier types between previous reports on a-CN x and that presented in this study was explained by the different conduction mechanism attributed to the charge conduction which was heavily influenced by the band structure. This is based on the fact that nitrogen modifications to the band structure occur mainly close to the Fermi level.…”

Section: Introductioncontrasting

confidence: 61%

“…(see Figure 3(c)) A shorter bandtail observed in a-CN x films, and the sharp peak in the DOS at approximately 1.5 eV for a-C could be attributed to the stress induced localized states as shown in Figure 3(c) [29].…”

Section: Discussionmentioning

confidence: 84%

“…Considering the fact that this material has an electrical mobility band gap which corresponds more closely with the σ and σ* bands, the Poole-Frenkel conduction reported for electrical conduction at high electric fields [27,29,35] may occur at the edge of the extended states (σ or σ* band). Then, the neutral trapping centres which provide electrons to the extended states under a high electric field should exist within a defect band or localized states (π or π* band).…”

Section: Discussionmentioning

confidence: 89%

“…[8] Then, the strong peak around -1.5 eV as shown in Figure 3 (c) could be associated with the defects band, which was expected by the electrical conduction results with the Pool-Frenkel model. [29] Figure 8: dI/dV plots for estimating the bandgap in the a-C and a-CNx.…”

Section: Discussionmentioning

confidence: 99%

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Probing the band structure of hydrogen-free amorphous carbon and the effect of nitrogen incorporation

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Section: Introductioncontrasting

confidence: 61%

Section: Discussionmentioning

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Probing the band structure of hydrogen-free amorphous carbon and the effect of nitrogen incorporation

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“…Pulsed laser deposition (PLD) is another technique that may be used to produce multi-element thin films [13][14][15]; here, multi-component nanostructures may be formed by simultaneous ablation of multiple targets and/or ablation of a composite target. Despite assertions that ablation of a composite target results in stoichiometric deposition [16], there have also been reported cases of non-stoichiometric thin film deposition [15,17].…”

Section: Introductionmentioning

confidence: 99%

Highly conductive nanoclustered carbon:nickel films grown by pulsed laser deposition

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et al. 2011

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Impact of Annealing on the Conductivity of Amorphous Carbon Films Incorporating Copper and Gold Nanoparticles Deposited by Pulsed Dual Cathodic Arc

Endrino

Horwat

Anders

et al. 2009

Plasma Processes & Polymers

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The influence of annealing in argon at 300 °C on the conductivity, phase stability and electronic structure of hydrogen‐free amorphous carbon (a‐C) films containing copper (a‐C:Cu) and gold (a‐C:Au) nanoclusters was investigated. The motivation of this work is twofold: (1) to study the thermal stability of a‐C:Cu and a‐C:Au films and (2) to point out the relevance of X‐ray absorption near edge structure (XANES) technique to study the structural evolution of metal‐doped a‐C nanocomposites. The films were produced at room temperature using a selective‐bias pulsed dual‐cathode arc deposition technique. Compositional analysis was performed with secondary neutral mass spectroscopy whereas grazing incidence X‐ray diffraction (GIXRD) was used to monitor phase transformation and identify the dispersion or agglomeration of the crystallites within the carbon matrix. XANES spectra at the C‐K was used to investigate the effect of annealing in argon on the electronic structure of the a‐C matrix, while Cu K and Au L‐edges were investigated on a‐C:Cu and a‐C:Au samples, respectively, to study the nanocluster evolution. XANES showed that the a‐C host matrix increased its graphitic character and that stress was relieved upon annealing. No relevant changes were observed in the Au arrangements in a‐C:Au films. In the case of the a‐C:Cu samples, the Cu‐K XANES spectra indicated the formation of Cu2O crystals which correlated well with GIXRD spectra and the decrease in conductivity.

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Electrical conduction mechanism in laser deposited amorphous carbon

Cited by 19 publications

References 17 publications

Probing the band structure of hydrogen-free amorphous carbon and the effect of nitrogen incorporation

Probing the band structure of hydrogen-free amorphous carbon and the effect of nitrogen incorporation

Highly conductive nanoclustered carbon:nickel films grown by pulsed laser deposition

Impact of Annealing on the Conductivity of Amorphous Carbon Films Incorporating Copper and Gold Nanoparticles Deposited by Pulsed Dual Cathodic Arc

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