Patents Represented by Attorney Dismore & Shohl LLP
  • Patent number: 7445996
    Abstract: A process and apparatus directed to forming low resistance contacts in both the memory cell array and peripheral logic circuitry areas of a semiconductor device, for example, a DRAM memory device, is disclosed. In a buried bit line connection process flow, the present invention utilizes chemical vapor deposition of titanium to form titanium silicide in contact structures of the peripheral logic circuitry areas and physical vapor deposition to provide a metal mode (metallic) titanium layer in contact with the poly plugs in the memory cell array area of a semiconductor device, for example, a DRAM memory device according to the present invention. In this manner, the present invention avoids the potential drawbacks such as voiding in the poly plugs of the memory cell array due to the present of titanium silicide, which can cause significant reduction of device drain current and in extreme cases cause electrical discontinuity.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: November 4, 2008
    Assignee: Micron Technology, Inc.
    Inventor: Terrence McDaniel