Photoelectron spectroscopy of the annealed and deuterium-exposed natural diamond (100) surface

Francz, G.; Oelhafen, P.

doi:10.1016/0039-6028(95)00174-3

Cited by 30 publications

(13 citation statements)

References 17 publications

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“…These observations accord closely with the results of previous studies 8, [10][11][12]49 and with the photoemission studies. [21][22][23] On hydrogenation to a coverage у1, the gap states disappear and additional states are observed in the energy ranges Ϫ7→Ϫ3 eV and 7→8 eV. The resulting band gap lies very close to the experimental bulk gap of 5.5 eV, indicating the bonding and antibonding surface states have been shifted by sufficiently large energies to fall into the region of the bulk valence and conduction bands.…”

Section: Electronic Structuresupporting

confidence: 64%

“…15,21,23 Angle-resolved measurements reveal there to be two surface states in this energy range, each possessing a moderate dispersion. 21,23 Exposure to atomic deuterium causes these surface features to disappear almost completely. 23 Exposure to very high doses of hydrogen or deuterium results in further changes in the electronic spectrum.…”

Section: Introductionmentioning

confidence: 92%

“…15,[21][22][23] On annealing the diamond samples at high temperature, filled surface states appear in a 1.5-eV-wide range immediately above the valence-band maximum. 15,21,23 Angle-resolved measurements reveal there to be two surface states in this energy range, each possessing a moderate dispersion. 21,23 Exposure to atomic deuterium causes these surface features to disappear almost completely.…”

Section: Introductionmentioning

confidence: 99%

“…21,23 Exposure to atomic deuterium causes these surface features to disappear almost completely. 23 Exposure to very high doses of hydrogen or deuterium results in further changes in the electronic spectrum. The features have tentatively been attributed to the presence of CH 2 and CH 3 fragments at the surface.…”

Section: Introductionmentioning

confidence: 99%

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Atomic and electronic structure of the diamond (100) surface: Reconstructions and rearrangements at high hydrogen coverage

1997

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The atomic and electronic structure of the diamond ͑100͒ surface has been investigated theoretically via a semiempirical tight-binding model for a range of hydrogen coverages. Model parameters for C-C interactions have been taken from the work of Goodwin ͓J. Phys. Condens. Matter 3, 3869 ͑1993͔͒, while new parameter sets have been determined for C-H and H-H interactions. The model gives results for the clean and monohydrogenated surfaces in good agreement with previous studies, but different features have been identified for higher H coverages. When the H coverage is sufficiently high, the substrate lattice is found to distort in order to reduce steric repulsions between dihydride units. As an important example, we obtain two structures for the dihydrogenated surface that are significantly more stable than those proposed previously. For H coverages intermediate between the monohydrogenated and dihydrogenated surfaces, stable geometries consisting of monohydrogenated dimer units and dihydride units are found. In contrast, geometries that include isolated monohydride units, such as have been previously investigated, are found to be thermodynamically and kinetically unstable. Tight-binding molecular dynamics is used to illustrate a mechanism for the rapid removal of isolated monohydride units. The electronic structures of the surfaces are described via the total and partial electronic densities of state, which are obtained directly from the tight-binding Hamiltonian. For the monohydrogenated surface and higher coverages, the stable geometries are found to yield no states in the bulk band gap.

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Section: Electronic Structuresupporting

confidence: 64%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Atomic and electronic structure of the diamond (100) surface: Reconstructions and rearrangements at high hydrogen coverage

1997

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“…In other words, the C1s peaks in the D þ 2 irradiation were located at higher energy than that in the He þ irradiation. This indicates that C-D bond formation between carbon atoms and the trapped deuterium atoms was induced by D þ 2 irradiation because the formation of C-D bond results in a decrease in the electron population of carbon atom, and also an increase of the binding energy of the C1s level [6,9,10]. In addition, the sp 3 /(sp 3 + sp 2 ) ratio was almost constant.…”

Section: Ion Fluence Dependencementioning

confidence: 88%

Energetic deuterium and helium irradiation effects on chemical structure of CVD diamond

Sasaki

Morimoto

Kimura

et al. 2004

Journal of Nuclear Materials

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Photoelectron Spectroscopy Study of Natural (100), (110), (111) and CVD Diamond Surfaces

Francz

Kania

Gantner

et al. 1996

Phys. Stat. Sol. (a)

Self Cite

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Natural type IIb diamond surfaces of (IOO), (110), and (111) orientation, as well as chemical vapor deposited (CVD) diamond thin films with (IOO), (110), or mixed orientation are probed by photoelectron spectroscopy in the ultraviolet (UPS) and X-ray (XPS) energy regimes. Dramatic changes can be observed in the valence band and core level spectra of these surfaces upon annealing, hydrogen-plasma exposure, or pulsed dye laser irradiation. The observed changes can be reversed by the exposure of the surfaces to atomic hydrogen (deuterium). The valence band spectra reveal specific surface reconstructions for all three surface preparation methods and moreover a cleaning effect is observed following laser irradiation of CVD diamond surfaces. A comparison to a multitude of theoretical and experimental studies on diamond surface reconstruction is made to elucidate the connection between electronic properties and atomic surface structures. I )

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Photoelectron spectroscopy of the annealed and deuterium-exposed natural diamond (100) surface

Cited by 30 publications

References 17 publications

Atomic and electronic structure of the diamond (100) surface: Reconstructions and rearrangements at high hydrogen coverage

Atomic and electronic structure of the diamond (100) surface: Reconstructions and rearrangements at high hydrogen coverage

Energetic deuterium and helium irradiation effects on chemical structure of CVD diamond

Photoelectron Spectroscopy Study of Natural (100), (110), (111) and CVD Diamond Surfaces

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