Investigation of diamond deposition by chemical vapor transport with hydrogen

Wladyslaw Piekarczyk; Russell F. Messier; Rustum Roy; Chris Engdahl

doi:10.1117/12.22440

1 December 1990 Investigation of diamond deposition by chemical vapor transport with hydrogen

Wladyslaw Piekarczyk, Russell F. Messier, Rustum Roy, Chris Engdahl

Proceedings Volume 1325, Diamond Optics III; (1990) https://doi.org/10.1117/12.22440
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

The carbon-hydrogen chemical vapor transport system was examined in accordance with a four-stage transport model. A result of this examination is that graphite co-deposition could be avoided when diamond is deposited from gas solutions under-saturated with respect to diamond. Actual deposition experiments showed that this unusual requirement can be fulfilled but only for the condition that the transport distance between the carbon source and the substrate surface is short. In such a case diamond can be deposited equally from super-saturated as well as from under-saturated gas solutions. On the basis of thermodynamic considerations a possible explanation of this unusual phenomenon is given. It is shown that there is a possibility of deposition of diamond from both super-saturated as well as under-saturated gas solutions but only on the condition that they are in a non-equilibrium state generally called the activated state. A model of the diamond deposition process consisting of two steps is proposed. In the first step diamond and graphite are deposited simultaneously. The most important carbon deposition reaction is C2H2(g) + 2 H(g) C(diamond graphite) + CH(g). The amount of co-deposited graphite is not a direct function of the saturation state of the gas phase. In the second step graphite is etched according to the most probable reaction C(graphite) + 4 H(g) CH4(g). Atomic hydrogen in a super-equilibrium concentration is necessary not only to etch graphite but also to precipitate and graphite. 1.

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Wladyslaw Piekarczyk, Russell F. Messier, Rustum Roy, and Chris Engdahl "Investigation of diamond deposition by chemical vapor transport with hydrogen", Proc. SPIE 1325, Diamond Optics III, (1 December 1990); https://doi.org/10.1117/12.22440

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