Patents by Inventor Douglas Chen-Hua Yu

Douglas Chen-Hua Yu 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: 5723893
    Abstract: A method is described for fabricating field effect transistors (FETs) having double silicide gate electrodes and interconnecting lines for CMOS circuits. The method reduces the IR voltage drops and RC time delay constants, and thereby improves circuit performance. The method consists of forming FETs having gate electrodes and interconnecting lines from a multilayer made up of a doped first polysilicon layer, a first silicide layer (WSi.sub.2), and a doped second polysilicon layer. After patterning the multilayer to form the gate electrodes, a titanium (Ti) metal is deposited and annealed to form a second silicide layer on the gate electrodes, and simultaneously forms self-aligned Ti silicide contacts on the source/drain areas. The latitude in overetching the contact openings in an insulating (PMD) layer to the gate electrodes extending over the field oxide area is increased, and the contact resistance (R.sub.c) is reduced because of the presence of the WSi.sub.
    Type: Grant
    Filed: May 28, 1996
    Date of Patent: March 3, 1998
    Assignee: Taiwan Semiconductor Manufacturing Company, Ltd.
    Inventors: Douglas Chen-Hua Yu, Pin-Nan Tseng