Invention Application
US20020179957A1 Structure and method for fabricating high Q varactor diodes 审中-公开
制造高Q变容二极管的结构和方法

  • Patent Title: Structure and method for fabricating high Q varactor diodes
  • Patent Title (中): 制造高Q变容二极管的结构和方法
  • Application No.: US09865447
    Application Date: 2001-05-29
  • Publication No.: US20020179957A1
    Publication Date: 2002-12-05
  • Inventor: Kevin B. TraylorJames S. Irwin
  • Applicant: MOTOROLA, INC.
  • Applicant Address: IL Schaumburg
  • Assignee: MOTOROLA, INC.
  • Current Assignee: MOTOROLA, INC.
  • Current Assignee Address: IL Schaumburg
  • Main IPC: H01L029/76
  • IPC: H01L029/76
Structure and method for fabricating high Q varactor diodes
Abstract:
High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer includes a layer of conductive metallic oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline material layer. A diode is formed on the overlying monocrystalline material layer, which is a gallium arsenide layer. Optionally, the accommodating buffer layer may include a non-conductive oxide layer on the conductive metallic oxide layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer. In addition, formation of a compliant substrate may include utilizing surfactant enhanced epitaxy, epitaxial growth of single crystal silicon onto single crystal oxide, and epitaxial growth of Zintl phase materials.
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