4.6 Article

High rate of diamond deposition through graphite etching in a hot filament CVD reactor

期刊

DIAMOND AND RELATED MATERIALS
卷 11, 期 7, 页码 1337-1343

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ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-9635(01)00671-9

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diamond; graphite etching; hot filament; high deposition rate

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Although a hot filament diamond CVD reactor has many advantages over other processes, the relatively low growth rate of the films has been a crucial drawback. We developed a new hot filament process that uses no hydrocarbon gas for diamond deposition. The graphite plate was placed below the silicon substrate and only hydrogen was supplied during the process. We could achieve the growth rate of 9 mum/h, which is approximately 9 times higher than that of conventional hot filament CVD using a gas mixture of methane and hydrogen. In spite of the high growth rate, the quality of diamond films was not degraded. Besides, the diamond films consisted of small crystallites with a smooth surface while the conventional diamond films of the same thickness tend to have a columnar structure with a rough surface. (C) 2002 Elsevier Science B.V. All rights reserved.

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