Patents by Inventor Vijay Narayanan

Vijay Narayanan 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).

  • Publication number: 20180190784
    Abstract: Semiconductor devices include at least one semiconductor fin in each of a first region and a second region. A first work function stack that includes a bottom layer, a middle layer, and a top layer is formed over the at least one semiconductor fin in the first region. A second work function stack that includes a first layer and a second layer is formed over the at least one semiconductor fin in the second region. The first layer is continuous with the bottom layer of the first work function stack and the second layer is continuous with the middle layer of the first work function stack but has a smaller thickness than the middle layer. A continuous gate is formed over the first and the second work function stack.
    Type: Application
    Filed: February 28, 2018
    Publication date: July 5, 2018
    Inventors: Ruqiang Bao, Siddarth A. Krishnan, Unoh Kwon, Vijay Narayanan
  • Publication number: 20180181774
    Abstract: A private key of a public-private key pair with a corresponding identity is written to an integrated circuit including a processor, a non-volatile memory, and a cryptographic engine coupled to the processor and the non-volatile memory. The private key is written to the non-volatile memory. The integrated circuit is implemented in complementary metal-oxide semiconductor 14 nm or smaller technology. The integrated circuit is permanently modified, subsequent to the writing, such that further writing to the non-volatile memory is disabled and such that the private key can be read only by the cryptographic engine and not off-chip. Corresponding integrated circuits and wafers are also disclosed.
    Type: Application
    Filed: December 22, 2016
    Publication date: June 28, 2018
    Inventors: Richard H. Boivie, Eduard A. Cartier, Daniel J. Friedman, Kohji Hosokawa, Charanjit Jutla, Wanki Kim, Chandrasekara Kothandaraman, Chung Lam, Frank R. Libsch, Seiji Munetoh, Ramachandran Muralidhar, Vijay Narayanan, Dirk Pfeiffer, Devendra K. Sadana, Ghavam G. Shahidi, Robert L. Wisnieff
  • Patent number: 10008386
    Abstract: Methods are provided to form pure silicon oxide layers on silicon-germanium (SiGe) layers, as well as an FET device having a pure silicon oxide interfacial layer of a metal gate structure formed on a SiGe channel layer of the FET device. For example, a method comprises growing a first silicon oxide layer on a surface of a SiGe layer using a first oxynitridation process, wherein the first silicon oxide layer comprises nitrogen. The first silicon oxide layer is removed, and a second silicon oxide layer is grown on the surface of the SiGe layer using a second oxynitridation process, which is substantially the same as the first oxynitridation process, wherein the second silicon oxide layer is substantially devoid of germanium oxide and nitrogen. For example, the first silicon oxide layer comprises a SiON layer and the second silicon oxide layer comprises a pure silicon dioxide layer.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: June 26, 2018
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Pouya Hashemi, Hemanth Jagannathan, Choonghyun Lee, Vijay Narayanan
  • Publication number: 20180171262
    Abstract: The present invention relates to novel compounds of general formulae (la), (lb) and (Ic) and to the stereoisomers thereof. The compounds are useful as a fragrance or as flavor as they have a sandalwood like scent. The invention also relates to a method for imparting or modifying a scent or a flavor to a composition by including said compounds into such composition, to a fragrance containing composition and/or a fragrance material containing said compound and to a process for preparing these compounds. X is C(R4)—OH or C?O; R1 is selected from the group consisting of hydrogen, C1-C4-alkyl, C2-C4-alkenyl and C3-C4-cycloalkyl, R2 is selected from the group consisting of hydrogen, C1-C4-alkyl, C2-C4-alkenyl and C3-C4-cycloalkyl, R3 is C1-C4-alkyl, R3a is selected from the group consisting of hydrogen and C1-C4-alkyl, R3b is hydrogen or together with R3a is CH2; R4 is selected from the group consisting of hydrogen and C1-C4-alkyl.
    Type: Application
    Filed: May 27, 2016
    Publication date: June 21, 2018
    Inventors: Stefan RÜDENAUER, Ralf PELZER, Vijay Narayanan SWAMINATHAN, Shrirang HINDALEKAR, Sadanand ARDEKAR
  • Publication number: 20180175156
    Abstract: A method of forming a gate stack that includes treating a semiconductor substrate with a wet etch chemistry to clean a surface of the semiconductor substrate and form an oxide containing interfacial layer, and converting the oxide containing interfacial layer to a binary alloy oxide based interlayer using a plasma deposition sequence including alternating a metal gas precursor and a nitrogen and/or hydrogen containing plasma. The method of forming the gate stack may further include forming a high-k dielectric layer atop the binary alloy oxide based interlayer.
    Type: Application
    Filed: February 12, 2018
    Publication date: June 21, 2018
    Inventors: Vijay Narayanan, Yohei Ogawa, John Rozen
  • Patent number: 10002871
    Abstract: An electrical device that includes at least one n-type field effect transistor including a channel region in a type III-V semiconductor device, and at least one p-type field effect transistor including a channel region in a germanium containing semiconductor material. Each of the n-type and p-type semiconductor devices may include gate structures composed of material layers including work function adjusting materials selections, such as metal and doped dielectric layers. The field effect transistors may be composed of fin type field effect transistors. The field effect transistors may be formed using gate first processing or gate last processing.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: June 19, 2018
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Martin M. Frank, Pranita Kerber, Vijay Narayanan
  • Patent number: 10002937
    Abstract: Semiconductor devices and methods of forming the same include forming a work function stack over semiconductor fins in a first region and a second region, the work function stack having a bottom layer, a middle layer, and a top layer. The work function stack is etched to remove the top layer and to decrease a thickness of the middle layer in the second region, leaving a portion of the middle layer and the bottom layer intact. A gate is formed over the semiconductor fins in the first and second regions.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: June 19, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Ruqiang Bao, Siddarth A. Krishnan, Unoh Kwon, Vijay Narayanan
  • Patent number: 9997519
    Abstract: A method of forming a semiconductor structure includes depositing a first work function metal layer in nanosheet channel stacks for first and second CMOS structure each including a first nanosheet channel stack for an nFET and a second nanosheet channel stack for a pFET. The method also includes patterning to remove the first work function metal layer surrounding nanosheet channels in the first nanosheet channel stack of the first CMOS structure and nanosheet channels in the second nanosheet channel stack of the second CMOS structure. The method further includes depositing a second work function metal layer to surround the nanosheet channels in the first nanosheet channel stack of the first CMOS structure and the nanosheet channels in the second nanosheet channel stack of the second CMOS structure. The first CMOS structure has a first threshold voltage and the second CMOS structure has a second threshold voltage.
    Type: Grant
    Filed: May 3, 2017
    Date of Patent: June 12, 2018
    Assignee: International Business Machines Corporation
    Inventors: Ruqiang Bao, Michael A. Guillorn, Vijay Narayanan
  • Patent number: 9984870
    Abstract: A technique relates to in-situ cleaning of a high-mobility substrate. Alternating pulses of a metal precursor and exposure to a plasma of a gas or gas mixture are applied. The gas or gas mixture contains both nitrogen and hydrogen (e.g., NH3). A passivation layer is formed on the high-mobility substrate by alternating pulses of the metal precursor and exposure to the plasma of a gas, or gas mixture, containing both nitrogen and hydrogen.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: May 29, 2018
    Assignees: INTERNATIONAL BUSINESS MACHINES CORPORATION, ULVAC, INC.
    Inventors: Takashi Ando, Vijay Narayanan, Yohei Ogawa, John Rozen
  • Patent number: 9985206
    Abstract: A resistive switching memory stack is provided. The resistive switching memory stack includes a bottom electrode, formed from one or more metals. The resistive switching memory stack further includes a metal oxide layer, disposed over the bottom electrode, formed from an Atomic Layer Deposition (ALD) of one or more metal oxides. The resistive switching memory stack also includes a top electrode, disposed over the metal oxide layer, formed from the ALD of a plurality of metals into a metal layer stack. An oxygen vacancy concentration of the resistive switching memory stack is controlled by (i) a thickness of the plurality of metals forming the top electrode and (ii) a percentage of a particular one of the plurality of metals in the metal layer stack of the top electrode.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: May 29, 2018
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Vijay Narayanan, John Rozen
  • Patent number: 9984940
    Abstract: A scaled dielectric stack interlayer, compatible with subsequent high temperature processing with good electrical transport & reliability properties is provided. A method for forming a conformal aSi:H passivation layer on a semiconductor device is described. A patterned semiconductor wafer is placed in in a process chamber with a first layer formed thereon and a second layer formed thereon, the first layer and the second layer being two different materials Next, a SixH(2x+2) based deposition up to a temperature of 400 degrees Celsius is used on the first layer and the second layer thereby forming a conformal aSi:H passivating layer is formed at a higher rate of deposition on the first layer selectively and a lower rate of deposit on the second layer.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: May 29, 2018
    Assignee: International Business Machines Corporation
    Inventors: Jack O. Chu, Stephen M. Gates, Masanobu Hatanaka, Vijay Narayanan, Deborah A. Neumayer, Yohei Ogawa, John Rozen
  • Patent number: 9972697
    Abstract: A method of fabricating a replacement gate stack for a semiconductor device includes the following steps after removal of a dummy gate: growing a high-k dielectric layer over the area vacated by the dummy gate; depositing a thin metal layer over the high-k dielectric layer; depositing a sacrificial layer over the thin metal layer; performing a first rapid thermal anneal; removing the sacrificial layer; and depositing a metal layer of low resistivity metal for gap fill.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: May 15, 2018
    Assignees: International Business Machines Corporation, GLOBALFOUNDRIES Inc.
    Inventors: Takashi Ando, Eduard A. Cartier, Kisik Choi, Vijay Narayanan
  • Patent number: 9972695
    Abstract: A method of forming a gate stack that includes treating a semiconductor substrate with a wet etch chemistry to clean a surface of the semiconductor substrate and form an oxide containing interfacial layer, and converting the oxide containing interfacial layer to a binary alloy oxide based interlayer using a plasma deposition sequence including alternating a metal gas precursor and a nitrogen and/or hydrogen containing plasma. The method of forming the gate stack may further include forming a high-k dielectric layer atop the binary alloy oxide based interlayer.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: May 15, 2018
    Assignees: INTERNATIONAL BUSINESS MACHINES CORPORATION, ULVAC, INC.
    Inventors: Vijay Narayanan, Yohei Ogawa, John Rozen
  • Patent number: 9960252
    Abstract: A method of fabricating a replacement gate stack for a semiconductor device includes the following steps after removal of a dummy gate: growing a high-k dielectric layer over the area vacated by the dummy gate; depositing a thin metal layer over the high-k dielectric layer; depositing a sacrificial layer over the thin metal layer; performing a first rapid thermal anneal; removing the sacrificial layer; and depositing a metal layer of low resistivity metal for gap fill.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: May 1, 2018
    Assignees: INTERNATIONAL BUSINESS MACHINES CORPORATION, GLOBALFOUNDRIES INC.
    Inventors: Takashi Ando, Eduard A. Cartier, Kisik Choi, Vijay Narayanan
  • Patent number: 9960233
    Abstract: After forming a buried nanowire segment surrounded by a gate structure located on a substrate, an epitaxial source region is grown on a first end of the buried nanowire segment while covering a second end of the buried nanowire segment and the gate structure followed by growing an epitaxial drain region on the second end of the buried nanowire segment while covering the epitaxial source region and the gate structure. The epitaxial source region includes a first semiconductor material and dopants of a first conductivity type, while the epitaxial drain region includes a first semiconductor material different from the first semiconductor material and dopants of a second conductivity type opposite the first conductivity type.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: May 1, 2018
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Siddarth A. Krishnan, Unoh Kwon, Vijay Narayanan, Jeffrey W. Sleight
  • Patent number: 9941282
    Abstract: A semiconductor device comprises a first semiconductor fin arranged on a substrate, the first semiconductor fin having a first channel region, and a second semiconductor fin arranged on the substrate, the second semiconductor fin having a second channel region. A first gate stack is arranged on the first channel region. The first gate stack comprises a first metal layer arranged on the first channel region, a work function metal layer arranged on the first metal layer, and a work function metal arranged on the work function metal layer. A second gate stack is arranged on the second channel region, the second gate stack comprising a work function metal arranged on the second channel region.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: April 10, 2018
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Ruqiang Bao, Dechao Guo, Vijay Narayanan
  • Publication number: 20180090381
    Abstract: A semiconductor device comprises a first semiconductor fin arranged on a substrate, the first semiconductor fin having a first channel region, and a second semiconductor fin arranged on the substrate, the second semiconductor fin having a second channel region. A first gate stack is arranged on the first channel region. The first gate stack comprises a first metal layer arranged on the first channel region, a work function metal layer arranged on the first metal layer, and a work function metal arranged on the work function metal layer. A second gate stack is arranged on the second channel region, the second gate stack comprising a work function metal arranged on the second channel region.
    Type: Application
    Filed: November 30, 2017
    Publication date: March 29, 2018
    Inventors: Ruqiang BAO, Dechao GUO, Vijay NARAYANAN
  • Publication number: 20180090591
    Abstract: A method is presented for forming a semiconductor device. The method includes forming an oxygen containing interfacial layer on a semiconductor substrate, forming a hafnium oxide layer on the interfacial layer, the hafnium oxide layer crystallizing to a non-centrosymmetric phase in a final structure, forming a first electrode containing a scavenging metal, which reduces a thickness of the interfacial layer via an oxygen scavenging reaction in the final structure, on the hafnium oxide layer, and forming a second electrode on the first electrode.
    Type: Application
    Filed: May 30, 2017
    Publication date: March 29, 2018
    Inventors: Takashi Ando, Martin M. Frank, Vijay Narayanan
  • Patent number: 9920007
    Abstract: The present invention relates to a process for the preparation of 1-(2,6,6-trimethylcyclohexylyalkan-3-ols, in particular 1-(2,6,6-trimethylcyclohexyl)-hexan-3-ol. The invention further relates to 5-alkoxy-1-(2,6,6-trimethylcyclohexenyl)-1-alken-3-ones and the use of these as a fragrance or as flavor, to a fragrance containing composition and/or a fragranced product containing 5-alkoxy-1-(2,6,6-trimethylcyclohexenyl)-1-alken-3-ones and to a method for imparting or modifying a scent or a flavor to a composition by including said alkoxyalkenones into such composition.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: March 20, 2018
    Assignee: BASF SE
    Inventors: Stefan Rüdenauer, Ralf Pelzer, Miriam Bru Roig, Vijay Narayanan Swaminathan, Shrirang Hindalekar, Nitin Gupte, Prachin Kolambkar
  • Publication number: 20180076040
    Abstract: Methods are provided to form pure silicon oxide layers on silicon-germanium (SiGe) layers, as well as an FET device having a pure silicon oxide interfacial layer of a metal gate structure formed on a SiGe channel layer of the FET device. For example, a method comprises growing a first silicon oxide layer on a surface of a SiGe layer using a first oxynitridation process, wherein the first silicon oxide layer comprises nitrogen. The first silicon oxide layer is removed, and a second silicon oxide layer is grown on the surface of the SiGe layer using a second oxynitridation process, which is substantially the same as the first oxynitridation process, wherein the second silicon oxide layer is substantially devoid of germanium oxide and nitrogen. For example, the first silicon oxide layer comprises a SiON layer and the second silicon oxide layer comprises a pure silicon dioxide layer.
    Type: Application
    Filed: September 12, 2016
    Publication date: March 15, 2018
    Inventors: Takashi Ando, Pouya Hashemi, Hemanth Jagannathan, Choonghyun Lee, Vijay Narayanan