From diamond to crystalline silicon carbonitride: effect of introduction of nitrogen in CH4/H2 gas mixture using MW-PECVD

Fu, Yong Qing, Sun, Chang Qing, Du, Hejun and Yan, Bibo (2002) From diamond to crystalline silicon carbonitride: effect of introduction of nitrogen in CH4/H2 gas mixture using MW-PECVD. Surface and Coatings Technology, 160 (2-3). pp. 165-172. ISSN 0257-8972

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Abstract

Microwave plasma enhanced chemical vapor deposition (MW-PECVD) is considered as one of the most successful growth techniques in recent diamond and crystalline carbon nitride investigations. In this study, we tried to synthesize crystalline carbon nitride film using MW-PECVD by gradually increasing the content of nitrogen into H2/CH4 gas mixture. Well-faceted crystalline diamond films could be synthesized with a H2/CH4 gas ratio of 198:2. With the gradual increase of nitrogen content up to 3% in the gas mixture diamond film quality deteriorates seriously, and the morphological crystal size and growth rate of diamond coatings decreased significantly. With the nitrogen gas content increased to approximately 6–22%, a lot of separated round diamond or diamond-like carbon particles formed on the surface rather than a continuous film. Only with the nitrogen content increased above 72%, could some tiny crystals with a type of hexagonal facet form on the silicon surface, together with many large, round diamond particles. With the further increase of nitrogen gas content above 90%, many large, well-faceted hexagonal crystals formed on Si surface. However, XRD, energy dispersive X-ray spectrometry, X-ray photoelectron spectroscopy and nano-indentation analysis indicated that these crystals were actually silicon carbonitride (Si–C–N) with a crystalline structure of Si3N4 modified with the introduction of carbon atoms, rather than carbonitride as expected and regarded.

Item Type: Article
Uncontrolled Keywords: Diamond; Silicon carbon nitride; MW-PECVD; Nitrogen
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 25 Mar 2015 13:42
Last Modified: 16 Mar 2016 14:19
URI: http://nrl.northumbria.ac.uk/id/eprint/21777

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