Optical Phonons in Amorphous Silicon Oxides. II. Calculation of Phonon Spectra and Interpretation of the IR Transmission of SiO<sub><i>x</i></sub>

Lehmann, A.; Schumann, L; Hübner, K.

doi:10.1002/pssb.2221210209

Cited by 64 publications

(27 citation statements)

References 20 publications

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“…Two broad features develop with growing film thickness. The stronger one at 982 cm −1 is assigned to the asymmetric stretching mode of the oxygen atom in a SiOSi bridge against the Si‐neighbour atoms 8, 25–29. The much weaker structure at ∼713 cm −1 corresponds to the Si stretching mode, a mode with dominating Si displacement 29, sometimes called ‘bending’ mode in the literature.…”

Section: Resultsmentioning

confidence: 97%

“…The stronger one at 982 cm −1 is assigned to the asymmetric stretching mode of the oxygen atom in a SiOSi bridge against the Si‐neighbour atoms 8, 25–29. The much weaker structure at ∼713 cm −1 corresponds to the Si stretching mode, a mode with dominating Si displacement 29, sometimes called ‘bending’ mode in the literature. Beyond 1 nm, these peak positions do not shift with film thickness anymore and, accordingly, the IR dielectric function of the evaporated film already resembles that of bulk SiO 12, 14, 30.…”

Section: Resultsmentioning

confidence: 97%

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Vibrational spectroscopy of SiO on Si(111)

Klevenz

Wetzel

Trieloff

et al. 2010

phys. stat. sol. (b)

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The growth of ultrathin SiO layers on clean Si(111) was observed by in situ infrared spectroscopy under ultra-high vacuum conditions. SiO was deposited by thermal evaporation of SiO powder from a Knudsen cell. A large shift of the SiO main vibrational line, from about 864 cm À1 for sub-monolayer coverage up to the bulk value of SiO at about 982 cm À1 for thicknesses above 10 Å , was observed. The extraordinary low vibrational frequencies for species at the SiO-Si interface corroborate recently published theoretical results for SiO adsorption on Si and for the SiO 2 -Si interface.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Vibrational spectroscopy of SiO on Si(111)

Klevenz

Wetzel

Trieloff

et al. 2010

phys. stat. sol. (b)

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“…2.3). As for the 456 cm −1 SiO 2 oscillator, a larger damping constant than that corresponding to the Palik data is justifyable also on the basis of the spectra published by Lehmann, Schumann & Hübner (1984). These authors studied the transmittance of thin SiO x films (with x<2) and found a strong broadening of the 20-21 µm band with decreasing x.…”

Section: Silicon Carbide Silicon Dioxidementioning

confidence: 87%

Reconsidering the Origin of the 21 Micron Feature: Oxides in Carbon‐rich Protoplanetary Nebulae?

Posch¹,

Mutschke²,

Andersen³

2004

ApJ

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The origin of the so-called '21' µm feature which is especially prominent in the spectra of some carbon-rich protoplanetary nebulae (PPNe) is the matter of a lively debate. A large number of potential band carriers have been presented and discarded within the past decade. The present paper gives an overview of the problems related to the hitherto proposed feature identifications, including the recently suggested candidate carrier silicon carbide. We also discuss the case for spectroscopically promising oxides.SiC is shown to produce a strong resonance band at 20-21 µm if coated by a layer of silicon dioxide. At low temperatures, core-mantle particles composed of SiC and amorphous SiO 2 indeed have their strongest spectral signature at a position of 20.1 µm, which coincides with the position of the '21' µm emission band.The optical constants of another candidate carrier that has been relatively neglected so far -iron monoxide -are proven to permit a fairly accurate reproduction of the '21' µm feature profile as well, especially when low-temperature measurements of the infrared properties of FeO are taken into account. As candidate carrier of the '21' µm emission band, FeO has the advantage of being stable against further oxidation and reduction only in a narrow range of chemical and physical conditions, coinciding with the fact that the feature, too, is detected in a small group of objects only. However, it is unclear how FeO should form or survive particularly in carbon-rich PPNe.

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“…SiO 2 has an absorption feature very near the c-BN absorption peak at 1072 cm Ϫ1 . 22 An improper account of the presence of SiO 2 may lead to an overprediction or misinterpretation of the amount of c-BN present in the film. It may be desirable to use IR reflectance spectroscopy at low grazing angles, rather than near-normal IR transmittance spectroscopy, so as to be more sensitive to the BN layer and less sensitive to SiO 2 that may be present at the interface.…”

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confidence: 99%

Cubic boron nitride synthesis in low-density supersonic plasma flows

Berns

Cappelli

1996

Applied Physics Letters

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We report on the growth of cubic boron nitride films on {100} silicon using a low density, supersonic plasma jet generated by a direct-current arc discharge expanded to low pressures. The arc discharge was operated on source gas mixtures of nitrogen and argon, with boron trichloride injected downstream of the expansion nozzle. The films were analyzed by infrared absorption and x-ray photoelectron spectroscopy. Phase selectivity was obtained by the application of a negative bias to the substrate so as to bombard the surface with energetic ions during deposition. The deposition process was found to be highly sensitive to substrate temperature and substrate bias voltage.

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Optical Phonons in Amorphous Silicon Oxides. II. Calculation of Phonon Spectra and Interpretation of the IR Transmission of SiO_x

Cited by 64 publications

References 20 publications

Vibrational spectroscopy of SiO on Si(111)

Vibrational spectroscopy of SiO on Si(111)

Reconsidering the Origin of the 21 Micron Feature: Oxides in Carbon‐rich Protoplanetary Nebulae?

Cubic boron nitride synthesis in low-density supersonic plasma flows

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Optical Phonons in Amorphous Silicon Oxides. II. Calculation of Phonon Spectra and Interpretation of the IR Transmission of SiOx

Cited by 64 publications

References 20 publications

Vibrational spectroscopy of SiO on Si(111)

Vibrational spectroscopy of SiO on Si(111)

Reconsidering the Origin of the 21 Micron Feature: Oxides in Carbon‐rich Protoplanetary Nebulae?

Cubic boron nitride synthesis in low-density supersonic plasma flows

Contact Info

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Optical Phonons in Amorphous Silicon Oxides. II. Calculation of Phonon Spectra and Interpretation of the IR Transmission of SiO_x