Nucleation and growth of polycrystalline SiC

M. Kaiser, S. Schimmel, V. Jokubavicius, M. K. Linnarsson, Haiyan Ou, M. Syväjärvi, P. Wellmann

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    Abstract

    The nucleation and bulk growth of polycrystalline SiC in a 2 inch PVT setup using isostatic and pyrolytic graphite as substrates was studied. Textured nucleation occurs under near-thermal equilibrium conditions at the initial growth stage with hexagonal platelet shaped crystallites of 4H, 6H and 15R polytypes. It is found that pyrolytic graphite results in enhanced texturing of the nucleating gas species. Reducing the pressure leads to growth of the crystallites until a closed polycrystalline SiC layer containing voids with a rough surface is developed. Bulk growth was conducted at 35 mbar Ar pressure at 2250°C in diffusion limited mass transport regime generating a convex shaped growth form of the solid-gas interface leading to lateral expansion of virtually [001] oriented crystallites. Growth at 2350°C led to the stabilization of 6H polytypic grains. The micropipe density in the bulk strongly depends on the substrate used.
    Original languageEnglish
    Title of host publicationEMRS 2013 Spring Meeting, Symposium G
    Number of pages7
    PublisherIOP Publishing
    Publication date2014
    Article number012001
    DOIs
    Publication statusPublished - 2014
    EventE-MRS 2013 Spring Meeting - Strasbourg, France
    Duration: 27 May 201331 May 2013
    http://www.emrs-strasbourg.com/index.php?option=com_content&task=view&id=569&Itemid=1583

    Conference

    ConferenceE-MRS 2013 Spring Meeting
    Country/TerritoryFrance
    CityStrasbourg
    Period27/05/201331/05/2013
    Internet address
    SeriesI O P Conference Series: Materials Science and Engineering
    Number1
    Volume56
    ISSN1757-8981

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