Low energy electron trapping in hydrogenated diamond surfaces by resonance electron attachment

Hoffman, A.; Akhvlediani, R.

doi:10.1016/j.diamond.2004.09.003

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…Moreover, the present study was conducted at substrate temperatures higher than those in their reports. It would bear some effects on the ESD process in the present study relative to those previous reports employing the electron beam, which should be studied further in the future.…”

Section: Resultsmentioning

confidence: 75%

“…On the other hand, it is worth to note here that the diamond growth environment in the present study differs somewhat from the experimental conditions in the previously reported hydrogen ESD studies: their ESD studies were conducted in a vacuum, in contrast to the reaction gas environment at a relatively high chamber pressure employed in the present study. Their experiments employed the electron beam with well‐defined energy, while the energy of the electrons directed to the anode in the present study was generated in the reaction gas plasma, and were consequently subjected to a Maxwellian distribution.…”

Section: Resultsmentioning

confidence: 84%

“…The hydrogen desorption was reported to be driven chemically by the atomic hydrogen, via the hydrogen abstraction reactions . By contrast, a physical pathway of such hydrogen desorption from the hydrogenated diamond surface, enabled by the electron bombardment, and known as the electron‐stimulated desorption (ESD), has been extensively studied . The ESD of hydrogen from the hydrogen‐terminated diamond surface was studied as a function of the bombarding electron energy to reveal that “the cross‐section of the ESD has a resonance behavior displaying two well‐defined peaks at 9 and 22 eV;” the resonance behavior was attributed to a resonant scattering phenomenon known as the “Feshbach resonance.” The effect of substrate temperature on the phenomenon was also reported: the resonant energy of the bombarding electron weakly decreased as the temperature was increased up to 450 K …”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

An Insight into Grain Refinement Mechanism of Ultrananocrystalline Diamond Films Obtained by Direct Current Plasma-Assisted Chemical Vapor Deposition

Lee

Cho

Kim

et al. 2014

Plasma Process. Polym.

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The grain-refinement mechanisms involved during the deposition of diamond films by directcurrent plasma assisted chemical vapor deposition (DC-PACVD) were investigated as a function of the inter-electrode electric field (IEEF). As IEEF was increased from 260 to 940 V cm À1 , the local electron temperatures near the growth front increased strongly; as a result, a strong grain refinement occurred ultimately yielding ultrananocrystalline diamond films (UNCD). Such observations were attributed to novel features of the DC-PACVD, including the electron-stimulated desorption (ESD) of the hydrogen-terminated moieties located at the surface, and the consequently enhanced generation of bi-radical sites at the growing diamond surface.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

An Insight into Grain Refinement Mechanism of Ultrananocrystalline Diamond Films Obtained by Direct Current Plasma-Assisted Chemical Vapor Deposition

Lee

Cho

Kim

et al. 2014

Plasma Process. Polym.

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show abstract

Voltammetric and impedance behaviours of surface-treated nano-crystalline diamond film electrodes

et al. 2014

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The electrochemical performances of hydrogen- and oxygen-terminated nano-crystalline diamond film electrodes were investigated by cyclic voltammetry and AC impedance spectroscopy. In addition, the surface morphologies, phase structures, and chemical states of the two diamond films were analysed by scanning probe microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. The results indicated that the potential window is narrower for the hydrogen-terminated nano-crystalline diamond film than for the oxygen-terminated one. The diamond film resistance and capacitance of oxygen-terminated diamond film are much larger than those of the hydrogen-terminated diamond film, and the polarization resistances and double-layer capacitance corresponding to oxygen-terminated diamond film are both one order of magnitude larger than those corresponding to the hydrogen-terminated diamond film. The electrochemical behaviours of the two diamond film electrodes are discussed.

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Effects of hydrogen atoms on surface conductivity of diamond film

Liu

Cui

et al. 2014

AIP Advances

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To investigate the effects of surface chemisorbed hydrogen atoms and hydrogen atoms in the subsurface region of diamond on surface conductivity, models of hydrogen atoms chemisorbed on diamond with (100) orientation and various concentrations of hydrogen atoms in the subsurface layer of the diamond were built. By using the first-principles method based on density functional theory, the equilibrium geometries and densities of states of the models were studied. The results showed that the surface chemisorbed hydrogen alone could not induce high surface conductivity. In addition, isolated hydrogen atoms in the subsurface layer of the diamond prefer to exist at the bond centre site of the C-C bond. However, such a structure would induce deep localized states, which could not improve the surface conductivity. When the hydrogen concentration increases, the C-H-C-H structure and C-3Hbc-C structure in the subsurface region are more stable than other configurations. The former is not beneficial to the increase of the surface conductivity. However, the latter would induce strong surface states near the Fermi level, which would give rise to high surface conductivity. Thus, a high concentration of subsurface hydrogen atoms in diamond would make significant contributions to surface conductivity.

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Low energy electron trapping in hydrogenated diamond surfaces by resonance electron attachment

Cited by 4 publications

References 21 publications

An Insight into Grain Refinement Mechanism of Ultrananocrystalline Diamond Films Obtained by Direct Current Plasma-Assisted Chemical Vapor Deposition

An Insight into Grain Refinement Mechanism of Ultrananocrystalline Diamond Films Obtained by Direct Current Plasma-Assisted Chemical Vapor Deposition

Voltammetric and impedance behaviours of surface-treated nano-crystalline diamond film electrodes

Effects of hydrogen atoms on surface conductivity of diamond film

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