Patents by Inventor Min-Tzong Yang

Min-Tzong Yang 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: 5413950
    Abstract: A new stacked capacitor structure having increased capacitance and a method of fabrication was accomplished. The capacitor stores data in the form of stored charge and together with a field effect transistor (MOSFET) make up the individual Dynamic Random Access Memory (DRAM) storage cells on a DRAM chip. The improved capacitor is fabricated using an electrically conducting layer in the bottom electrode of the capacitor, which is substantially different in composition from silicon. The conducting layer preferably being a refractory metal or a refactory metal silicides, such as, tungsten (W) or tungsten silicide (WSi). The bottom electrode is formed from a multilayer composed of a thin polysilicon layer, the conducting layer and an upper thicker polysilicon layer. Vertical capacitor sidewalls are formed from the upper polysilicon layer by photoresist masking and then etching to the conducting layer. The conducting layer provides an etch end point for accurately etching to the correct depth without over etching.
    Type: Grant
    Filed: April 22, 1994
    Date of Patent: May 9, 1995
    Assignee: United Microelectronics Corporation
    Inventors: Anchor Chen, Min-Tzong Yang, Chen-Chiu Hsue, Gary Hong