Patents Assigned to United Microelectronics Corp., United Semiconductor Corp.
  • Patent number: 6184082
    Abstract: A method of fabricating a dynamic random access memory is described. The surrounding of a capacitor is covered with stop layers to prevent damage during the etching process for forming a bit line contact opening. A first dielectric layer is formed and it is patterned to form a capacitor opening therein. A conformal first stop layer is formed and covers the first dielectric layer and the capacitor opening. A part of the conformal first stop layer on the first source/drain is removed to form a self-aligned node contact opening. The capacitor is formed in the capacitor opening and the self-aligned node contact opening. A conformal second stop layer layer are formed over the substrate. A part of the second dielectric layer over the second source/drain, the conformal second stop layer, the first stop layer and the first dielectric layer underneath is removed to form a self-aligned bit line contact opening. A bit line is formed over the third dielectric layer and within the self-aligned bit line contact opening.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: February 6, 2001
    Assignee: United Microelectronics Corp., United Semiconductor Corp.
    Inventor: Yong-Fen Hsieh