Patents by Inventor Haizheng Song

Haizheng Song has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10260166
    Abstract: Methods for forming an epilayer on a surface of a substrate are generally provided. For example, a substrate can be positioned within a hot wall CVD chamber (e.g., onto a susceptor within the CVD chamber). At least two source gases can then be introduced into the hot wall CVD chamber such that, upon decomposition, fluorine atoms, carbon atoms, and silicon atoms are present within the CVD chamber. The epilayer comprising SiC can then be grown on the surface of the substrate in the presence of the fluorine atoms.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: April 16, 2019
    Assignee: University of South Carolina
    Inventors: Tangali S. Sudarshan, Tawhid Rana, Haizheng Song
  • Publication number: 20180044816
    Abstract: Methods for forming an epilayer on a surface of a substrate are generally provided. For example, a substrate can be positioned within a hot wall CVD chamber (e.g., onto a susceptor within the CVD chamber). At least two source gases can then be introduced into the hot wall CVD chamber such that, upon decomposition, fluorine atoms, carbon atoms, and silicon atoms are present within the CVD chamber. The epilayer comprising SiC can then be grown on the surface of the substrate in the presence of the fluorine atoms.
    Type: Application
    Filed: October 11, 2017
    Publication date: February 15, 2018
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana
  • Patent number: 9885124
    Abstract: Methods for forming an epilayer on a surface of a substrate are generally provided. For example, a substrate can be positioned within a hot wall CVD chamber (e.g., onto a susceptor within the CVD chamber). At least two source gases can then be introduced into the hot wall CVD chamber such that, upon decomposition, fluorine atoms, carbon atoms, and silicon atoms are present within the CVD chamber. The epilayer comprising SiC can then be grown on the surface of the substrate in the presence of the fluorine atoms.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: February 6, 2018
    Assignee: University of South Carolina
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana
  • Patent number: 9644288
    Abstract: Non-destructive pretreatment methods are generally provided for a surface of a SiC substrate with substantially no degradation of surface morphology thereon. In one particular embodiment, a molten suspension mixture (e.g., including KOH (or KOH eutectic) and a buffering agent) is applied directly onto the surface of the SiC substrate to form a treated surface thereon. An epitaxial film (e.g., SiC) can then be grown on the treated surface to achieve very high (e.g., up to and including 100%) BPD to TED conversion rate close to the epilayer/substrate interface.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: May 9, 2017
    Assignee: University of South Carolina
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana
  • Patent number: 9644287
    Abstract: Non-destructive pretreatment methods are generally provided for a surface of a SiC substrate with substantially no degradation of surface morphology thereon. In one particular embodiment, a molten mixture (e.g., including KOH and a buffering agent) is applied directly onto the surface of the SiC substrate to form a treated surface thereon. An epitaxial film (e.g., SiC) can then be grown on the treated surface to achieve very high (e.g., up to and including 100%) BPD to TED conversion rate close to the epilayer/substrate interface.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: May 9, 2017
    Assignee: University of South Carolina
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana
  • Publication number: 20150129897
    Abstract: Non-destructive pretreatment methods are generally provided for a surface of a SiC substrate with substantially no degradation of surface morphology thereon. In one particular embodiment, a molten mixture (e.g., including KOH and a buffering agent) is applied directly onto the surface of the SiC substrate to form a treated surface thereon. An epitaxial film (e.g., SiC) can then be grown on the treated surface to achieve very high (e.g., up to and including 100%) BPD to TED conversion rate close to the epilayer/substrate interface.
    Type: Application
    Filed: December 2, 2014
    Publication date: May 14, 2015
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana
  • Publication number: 20150128850
    Abstract: Non-destructive pretreatment methods are generally provided for a surface of a SiC substrate with substantially no degradation of surface morphology thereon. In one particular embodiment, a molten suspension mixture (e.g., including KOH (or KOH eutectic) and a buffering agent) is applied directly onto the surface of the SiC substrate to form a treated surface thereon. An epitaxial film (e.g., SiC) can then be grown on the treated surface to achieve very high (e.g., up to and including 100%) BPD to TED conversion rate close to the epilayer/substrate interface.
    Type: Application
    Filed: December 2, 2014
    Publication date: May 14, 2015
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana
  • Patent number: 8900979
    Abstract: Non-destructive pretreatment methods are generally provided for a surface of a SiC substrate with substantially no degradation of surface morphology thereon. In one particular embodiment, a molten mixture (e.g., including KOH and a buffering agent) is applied directly onto the surface of the SiC substrate to form a treated surface thereon. An epitaxial film (e.g., SiC) can then be grown on the treated surface to achieve very high (e.g., up to and including 100%) BPD to TED conversion rate close to the epilayer/substrate interface.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: December 2, 2014
    Assignee: University of South Carolina
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana
  • Publication number: 20140338588
    Abstract: Methods for forming an epilayer on a surface of a substrate are generally provided. For example, a substrate can be positioned within a hot wall CVD chamber (e.g., onto a susceptor within the CVD chamber). At least two source gases can then be introduced into the hot wall CVD chamber such that, upon decomposition, fluorine atoms, carbon atoms, and silicon atoms are present within the CVD chamber. The epilayer comprising SiC can then be grown on the surface of the substrate in the presence of the fluorine atoms.
    Type: Application
    Filed: November 20, 2012
    Publication date: November 20, 2014
    Inventors: Tangali S. Sudarshan, Haizheng Song, Tawhid Rana