Patents by Inventor Alexander A. Demkov

Alexander A. Demkov 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: 6693033
    Abstract: A method of removing an amorphous oxide from a surface of a monocrystalline substrate is provided. The method includes depositing a passivation material overlying the amorphous oxide. The monocrystalline substrate is then heated so that the amorphous oxide layer decomposes into at least one volatile species that is liberated from the surface.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: February 17, 2004
    Assignee: Motorola, Inc.
    Inventors: John L. Edwards, Jr., Yi Wei, Dirk C. Jordan, Xiaoming Hu, James Bradley Craigo, Ravindranath Droopad, Zhiyi Yu, Alexander A. Demkov
  • Publication number: 20030122130
    Abstract: High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large GaAs wafers by forming a compliant substrate for growing the monocrystalline layers. An accommodating buffer layer is spaced apart from a GaAs substrate by a decoupling layer. The decoupling layer dissipates strain and permits the growth of a high quality monocrystalline accommodating buffer layer. The accommodating buffer layer is lattice matched to the overlying monocrystalline material layer. Any lattice mismatch between the accommodating buffer layer and the underlying GaAs substrate is taken care of by the decoupling layer.
    Type: Application
    Filed: December 27, 2001
    Publication date: July 3, 2003
    Applicant: MOTOROLA, Inc.
    Inventors: Alexander A. Demkov, Nada A. El-Zein
  • Publication number: 20030038299
    Abstract: High quality epitaxial layers of monocrystalline materials (26) can be grown overlying monocrystalline substrates such as large silicon wafers (22) by forming a compliant substrate for growing the monocrystalline layers (26). One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer (24) on a silicon wafer (22). The accommodating buffer layer (24) is a layer of monocrystalline oxide spaced apart from the silicon wafer (22) by an amorphous interface layer of silicon oxide (28). The amorphous interface layer (28) dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer (24).
    Type: Application
    Filed: August 23, 2001
    Publication date: February 27, 2003
    Applicant: MOTOROLA, INC.
    Inventor: Alexander A. Demkov
  • Publication number: 20030034500
    Abstract: High quality epitaxial layers of monocrystalline materials (106) can be grown overlying monocrystalline substrates (102) 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 Zintl buffer layer (104) on a silicon wafer. Any lattice mismatch between the monocrystalline layer (106) and the underlying silicon substrate (102) is absorbed by the Zintl interface layer (104).
    Type: Application
    Filed: August 15, 2001
    Publication date: February 20, 2003
    Applicant: MOTOROLA, INC.
    Inventors: Alexander A. Demkov, Zhiyi Yu, Jamal Ramdani
  • Publication number: 20030027409
    Abstract: High quality epitaxial layers of germanium can be grown overlying large silicon wafers by first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer is a layer of monocrystalline 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 germanium layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer.
    Type: Application
    Filed: August 2, 2001
    Publication date: February 6, 2003
    Applicant: MOTOROLA, INC.
    Inventors: Jamal Ramdani, Edgar H. Callaway, Alexander Demkov, Lyndee Hilt
  • Publication number: 20030020104
    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. An accommodating buffer layer comprises a layer of monocrystalline oxide spaced apart from a 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. 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.
    Type: Application
    Filed: July 25, 2001
    Publication date: January 30, 2003
    Applicant: MOTOROLA, INC.
    Inventors: Albert A. Talin, Alexander A. Demkov, Paige M. Holm
  • Publication number: 20030022520
    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 (24) on a silicon wafer (22). The accommodating buffer layer (24) is a layer of monocrystalline oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide (28). The amorphous interface layer (28) dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. Light-assisted deposition techniques are used to form the accommodating buffer layer (24).
    Type: Application
    Filed: July 25, 2001
    Publication date: January 30, 2003
    Applicant: MOTOROLA, INC.
    Inventors: Alexander A. Demkov, Zhiyi Yu, Barbara Foley Barenburg
  • Publication number: 20030015711
    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. An accommodating buffer layer comprises a layer of monocrystalline oxide spaced apart from a 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. 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 includes utilizing an intermetallic layer of an intermetallic compound material.
    Type: Application
    Filed: July 20, 2001
    Publication date: January 23, 2003
    Applicant: Motorola, Inc.
    Inventors: Albert A. Talin, Lyndee L. Hilt, Alexander A. Demkov
  • Publication number: 20030001207
    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 is a layer of monocrystalline 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. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer.
    Type: Application
    Filed: May 16, 2001
    Publication date: January 2, 2003
    Applicant: Motorola, Inc.
    Inventors: Jamal Ramdani, Alexander A. Demkov, Lyndee L. Hilt
  • Patent number: 6479173
    Abstract: A semiconductor structure comprises a silicon substrate (10), one or more layers of single crystal oxides or nitrides (26), and an interface (14) between the silicon substrate and the one or more layers of single crystal oxides or nitrides, the interface manufactured with a crystalline material which matches the lattice constant of silicon. The interface comprises an atomic layer of silicon, nitrogen, and a metal in the form MSiN2, where M is a metal. In a second embodiment, the interface comprises an atomic layer of silicon, a metal, and a mixture of nitrogen and oxygen in the form MSi[N1−xOx]2, where M is a metal and X is 0≦X<1.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: November 12, 2002
    Assignee: Motorola, Inc.
    Inventors: Zhiyi Yu, Jun Wang, Ravindranath Droopad, Alexander Demkov, Jerald Allan Hallmark, Jamal Ramdani
  • Publication number: 20020072253
    Abstract: A method of removing an amorphous oxide from a surface of a monocrystalline substrate is provided. The method includes depositing a passivation material overlying the amorphous oxide. The monocrystalline substrate is then heated so that the amorphous oxide layer decomposes into at least one volatile species that is liberated from the surface.
    Type: Application
    Filed: October 26, 2001
    Publication date: June 13, 2002
    Applicant: MOTOROLA, INC.
    Inventors: John L. Edwards, Yi Wei, Dirk C. Jordan, Xiaoming Hu, James Bradley Craigo, Ravindranath Droopad, Zhiyi Yu, Alexander A. Demkov