Patents by Inventor Ho-Chaw Sing

Ho-Chaw Sing 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: 6645818
    Abstract: A new method for forming a dual-metal gate CMOS transistors is described. An NMOS and a PMOS active area of a semiconductor substrate are separated by isolation regions. A nitride layer is deposited overlying a gate dielectric layer and patterned to form a first dummy gate in each of the active areas. First ions are implanted to form source/drain regions in each of the active areas not covered by the first dummy gates. The first dummy gates are isotropically etched to form second dummy gates thinner than the first dummy gates. Second ions are implanted to form lightly doped source/drain regions in each of the active areas not covered by the second dummy gates. Dielectric spacers are formed on sidewalls of the second dummy gates and the source/drain regions are silicided. The second dummy gates and spacers are removed. A first metal layer is deposited overlying the substrate and patterned to form a first metal gate in one of the NMOS and PMOS active areas.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: November 11, 2003
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Ho-Chaw Sing, Ng Chit Hwei