Synthesis of high quality diamond films in a turbulent flame

Snail, Keith A.; Craigie, C. J.

doi:10.1063/1.105059

Cited by 34 publications

(5 citation statements)

References 9 publications

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“…Both quantities vary linearly with respect to this parameter. High quality films obtained at high flow rates have also been reported by Snail and Craigie [14]. At low oxygen flows, the morphology of the diamond films is changed from octahedral to cubo-octahedral.…”

Section: Resultssupporting

confidence: 72%

Controlled deposition of diamond from an acetylene-oxygen combustion flame

Schermer

Hogenkamp

Otter

et al. 1993

Diamond and Related Materials

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An experimental setup for the deposition of diamond by an acetylene-oxygen combustion flame was developed in which it is possible to control the deposition temperature within 10 °C during long-term experiments. This degree of accuracy is obtained by cooling the back of the substrate holder with an electronically controlled water injection system and using soldered substrates, ensuring a good thermal contact. With this setup a large number of experiments were performed with deposition times of I h. Special attention was given to the growth of diamond layers with uniform thickness and morphology because these properties are considered essential for future applications. It was found that the deposition temperature, the total gas flow, the composition of the gas phase and the position of the substrate in the flame all have major influences on the deposit. Not only the growth rate and the quality of the diamond are strongly influenced by the deposition conditions, but also the preferred crystal habit and the homogeneity.

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Section: Resultssupporting

confidence: 72%

Controlled deposition of diamond from an acetylene-oxygen combustion flame

Schermer

Hogenkamp

Otter

et al. 1993

Diamond and Related Materials

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“…The surplus of acetylene, typically between 3% and 6%, is decomposed in all kinds of active hydrocarbon species by the energy released in the primary combustion process [41]. These species reach the diamond surface by active transport in the main stream, which has a stagnation flow geometry, and diffusion through the boundary layer above the substrate [42][43][44]. A thin boundary layer decreases the diffusion time thus results in a high flux of growth species towards the growing surface, In case of homoepitaxy on relatively small (1-4 mm in diameter) diamond seed crystals, the thickness of the boundary layer can be assumed to be fairly constant over the entire surface with exception of the substrate rims.…”

Section: Sources Of Macrosteps On {001} Diamond Facesmentioning

confidence: 99%

Mosaic growth of diamond: a study of homoepitaxial flame deposition and etching of {001}-oriented diamond layers

Schermer

Theije

Giling

1996

Journal of Crystal Growth

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This study describes homoepitaxial growth and etch phenomena observed on cubic diamond faces as obtained by the application of an acetylene-oxygen combustion flame. It is demonstrated that flame etching of the diamond substrates prior to growth decreases the number of crystallographic imperfections in the diamond layers especially at the edges. This enables a more uniform distributed step generation by the large number of individual dislocations present in the used natural type IIa diamond substrates. Due to this improvement it appears possible to grow one single crystal diamond layer on top of several closely spaced, well-aligned natural diamond substrates. In the present work the overgrowth of a three-piece mosaic structure with gaps along (100) as well as along (110) is reported for the first time. The single crystal nature of this flame-deposited diamond layer could be confirmed by the observation of continuous growth step patterns at the surface across the joint regions. The widths of the gaps between the substrates in the original mosaic structure varied from 7 to 25 ~m, which is more than an order of magnitude larger than the gaps along (100) in two-piece mosaic structures, of which the single crystal overgrowth by HFCVD was previously reported. Comparison of micro-Raman spectra obtained from the joint regions with those from other parts of the overgrown mosaics discussed in the present work, show a larger FWHM of the diamond peak in case of a (110) joint and a shift of the peak position to higher wave numbers in case of a (100) joint.

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“…The gas velocities are adjusted such that the reactive species interact with the substrate in less than 2-3 msec (Debroy et al, 1990). Based upon certain recent observations (Snail and Hanssen, 1991;Snail and Craigie, 1991;Glesener, Morish and Snail, 1991), literature surveys (Matsui et al, 1989;Cappelli and Paul, 1989;Cappelli and Paul, 1990;Yarbrough, Stewart and Cooper, 1990), and with the suggested modifications, growth rates on the order of 200-300 itm can be realized. Figure l(a) shows a schematic of a proposed R.F.…”

Section: An Overview Of Diamond Characteristicsmentioning

confidence: 99%