Patents by Inventor Kuniko Kikuta

Kuniko Kikuta 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: 10276390
    Abstract: A method of making a transistor for an integrated circuit includes providing a substrate and forming a dummy gate for the transistor within a gate trench on the substrate. The gate trench includes sidewalls, a trench bottom, and a trench centerline extending normally from a center portion of the trench bottom. The dummy gate is removed from the gate trench. A gate dielectric layer is disposed within the gate trench. A gate work-function metal layer is disposed over the gate dielectric layer, the work-function metal layer including a pair of corner regions proximate the trench bottom. An angled implantation process is utilized to implant a work-function tuning species into the corner regions at a tilt angle relative to the trench centerline, the tilt angle being greater than zero.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: April 30, 2019
    Assignee: GLOBALFOUNDRIES Inc.
    Inventors: Min-hwa Chi, Meixiong Zhao, Kuniko Kikuta
  • Publication number: 20170301544
    Abstract: A method of making a transistor for an integrated circuit includes providing a substrate and forming a dummy gate for the transistor within a gate trench on the substrate. The gate trench includes sidewalls, a trench bottom, and a trench centerline extending normally from a center portion of the trench bottom. The dummy gate is removed from the gate trench. A gate dielectric layer is disposed within the gate trench. A gate work-function metal layer is disposed over the gate dielectric layer, the work-function metal layer including a pair of corner regions proximate the trench bottom. An angled implantation process is utilized to implant a work-function tuning species into the corner regions at a tilt angle relative to the trench centerline, the tilt angle being greater than zero.
    Type: Application
    Filed: April 13, 2016
    Publication date: October 19, 2017
    Applicant: GLOBALFOUNDRIES Inc.
    Inventors: Min-hwa CHI, Meixiong ZHAO, Kuniko KIKUTA
  • Patent number: 8378454
    Abstract: A semiconductor device has a semiconductor substrate, a multi-layered wiring construction formed over the semiconductor device, and a metal-insulator-metal (MIM) capacitor arrangement established in the multi-layered wiring construction. The MIM capacitor arrangement includes first, second, third, fourth, fifth, and sixth electrode structures, which are arranged in order in parallel with each other at regular intervals. The first, second, fifth and sixth electrode structures are electrically connected to each other so as to define a first capacitor, and the third and fourth electrode structures are electrically connected to each other so as to define a second capacitor.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: February 19, 2013
    Assignee: Renesas Electronics Corporation
    Inventors: Masayuki Furumiya, Kuniko Kikuta, Ryota Yamamoto, Makoto Nakayama
  • Publication number: 20110254130
    Abstract: A semiconductor device has a semiconductor substrate, a multi-layered wiring construction formed over the semiconductor device, and a metal-insulator-metal (MIM) capacitor arrangement established in the multi-layered wiring construction. The MIM capacitor arrangement includes first, second, third, fourth, fifth, and sixth electrode structures, which are arranged in order in parallel with each other at regular intervals. The first, second, fifth and sixth electrode structures are electrically connected to each other so as to define a first capacitor, and the third and fourth electrode structures are electrically connected to each other so as to define a second capacitor.
    Type: Application
    Filed: June 30, 2011
    Publication date: October 20, 2011
    Applicant: RENESAS ELECTRONICS CORPORATION
    Inventors: Masayuki FURUMIYA, Kuniko KIKUTA, Ryota YAMAMOTO, Makoto NAKAYAMA
  • Patent number: 7986026
    Abstract: A semiconductor device has a semiconductor substrate, a multi-layered wiring construction formed over the semiconductor device, and a metal-insulator-metal (MIM) capacitor arrangement established in the multi-layered wiring construction. The MIM capacitor arrangement includes first, second, third, fourth, fifth, and sixth electrode structures, which are arranged in order in parallel with each other at regular intervals. The first, second, fifth and sixth electrode structures are electrically connected to each other so as to define a first capacitor, and the third and fourth electrode structures are electrically connected to each other so as to define a second capacitor.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: July 26, 2011
    Assignee: Renesas Electronics Corporation
    Inventors: Masayuki Furumiya, Kuniko Kikuta, Ryota Yamamoto, Makoto Nakayama
  • Patent number: 7777288
    Abstract: In a temperature sensor section of a semiconductor integrated circuit device, wires of the topmost wiring layer of a multi-layer wiring structure are formed. A sheet-like temperature monitor element of vanadium oxide is provided between two of the wires in such a way as to cover the two wires. Accordingly, the temperature monitor element is connected between the two wires of an underlying wiring layer of the multi-layer wiring structure through two vias and the two wires of the topmost wiring layer.
    Type: Grant
    Filed: February 8, 2005
    Date of Patent: August 17, 2010
    Assignees: NEC Electronics Corporation, NEC Corporation
    Inventors: Naoyoshi Kawahara, Hiroshi Murase, Hiroaki Ohkubo, Kuniko Kikuta, Yasutaka Nakashiba, Naoki Oda, Tokuhito Sasaki, Nobukazu Ito
  • Publication number: 20100148307
    Abstract: A semiconductor device has a semiconductor substrate, a multi-layered wiring construction formed over the semiconductor device, and a metal-insulator-metal (MIM) capacitor arrangement established in the multi-layered wiring construction. The MIM capacitor arrangement includes first, second, third, fourth, fifth, and sixth electrode structures, which are arranged in order in parallel with each other at regular intervals. The first, second, fifth and sixth electrode structures are electrically connected to each other so as to define a first capacitor, and the third and fourth electrode structures are electrically connected to each other so as to define a second capacitor.
    Type: Application
    Filed: February 17, 2010
    Publication date: June 17, 2010
    Applicant: NEC ELECTRONICS CORPORATION
    Inventors: Masayuki FURUMIYA, Kuniko KIKUTA, Ryota YAMAMOTO, Makoto NAKAYAMA
  • Patent number: 7705422
    Abstract: A semiconductor device has a semiconductor substrate, a multi-layered wiring construction formed over the semiconductor device, and a metal-insulator-metal (MIM) capacitor arrangement established in the multi-layered wiring construction. The MIM capacitor arrangement includes first, second, third, fourth, fifth, and sixth electrode structures, which are arranged in order in parallel with each other at regular intervals. The first, second, fifth and sixth electrode structures are electrically connected to each other so as to define a first capacitor, and the third and fourth electrode structures are electrically connected to each other so as to define a second capacitor.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: April 27, 2010
    Assignee: NEC Electronics Corporation
    Inventors: Masayuki Furumiya, Kuniko Kikuta, Ryota Yamamoto, Makoto Nakayama
  • Patent number: 7663207
    Abstract: A semiconductor device includes a capacitor with an MIM structure, by which the dimensional accuracy of the device is improved, and a stable capacitance value is given. The semiconductor device 100 includes: a semiconductor substrate 102; a capacitor forming region 130 in which an MIM capacitor is formed, which has an insulating interlayer 104 formed on the semiconductor substrate 102, a first electrode 110, and a second electrode 112, and the first electrode 110 and the second electrode 112 are arranged facing each other through the insulating interlayer 104; and a shielding region 132 which includes a plurality of shielding electrodes 114 formed in the outer edge of the capacitor forming region 130 and, at the same time, set at a predetermined potential in the same layer as that of the MIM capacitor on the semiconductor substrate 102, and shields the capacitor forming region 130 from other regions.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: February 16, 2010
    Assignee: NEC Electronics Corporation
    Inventors: Kuniko Kikuta, Masayuki Furumiya, Ryota Yamamoto, Makoto Nakayama
  • Patent number: 7554158
    Abstract: An N-type deep well is used to protect a circuit from a noise. However, a noise with a high frequency propagates through the N-type deep well, and as a result, the circuit that should be protected malfunctions. To reduce the area of the N-type deep well. For instance, in the present invention, a semiconductor device comprises a semiconductor substrate of a first conductivity type, a digital circuit part and an analog circuit part provided on the semiconductor substrate, a plurality of wells of the first conductivity type formed in either the analog circuit part or the digital circuit part, and a first deep well of a second conductivity type, which is the opposite conductivity type to the first conductivity type, isolating some of the plurality of wells from the semiconductor substrate.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: June 30, 2009
    Assignee: NEC Electronics Corporation
    Inventors: Ryota Yamamoto, Kuniko Kikuta
  • Patent number: 7494867
    Abstract: A method for manufacturing a semiconductor device is provided. The method includes forming a lower interconnection on a semiconductor substrate; forming a first interlayer insulation film in which the lower interconnection is buried; forming an MIM capacitive element on the first interlayer insulation film, the MIM capacitive element being formed by layering a lower electrode, a dielectric film, and an upper electrode; forming a second interlayer insulation film in which the MIM capacitive element is buried; forming via holes in the second interlayer insulation film so as to reach the lower electrode; forming a connection plug by filling the via hole with conductive film; and forming an upper interconnection to be connected to the connection plug above the second interlayer insulation film.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: February 24, 2009
    Assignee: NEC Electronics Corporation
    Inventors: Kuniko Kikuta, Makoto Nakayama
  • Patent number: 7477538
    Abstract: A technique for reducing influences of the bias magnetic field developed by yokes used for concentrating the magnetic field on magnetoresistance elements, on MRAM operations. An MRAM is composed of a plurality of magnetoresistance elements having magnetic anisotropy in a first direction; a wiring extended in a second direction different from the first direction, through which a write current flows for writing data into the magnetoresistance elements; and a yoke layer formed of ferromagnetic material, extended along the second direction, and covering at least a portion of a surface of the wiring. The plurality of magnetoresistance elements include a first magnetoresistance element, and a second magnetoresistance element of which the distance from an end of the yoke layer is further than that of the first magnetoresistance element. The first magnetoresistance element has a magnetic anisotropy stronger than that of the second magnetoresistance element.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: January 13, 2009
    Assignee: NEC Corporation
    Inventors: Kenichi Shimura, Kuniko Kikuta
  • Patent number: 7432170
    Abstract: On a silicon substrate, a first insulation layer, a lower conductive layer, a capacitor-insulator layer, and an upper conductive layer are formed in that order. Then, a first resist pattern is formed, the upper conductive layer is etched to form an upper electrode, and the capacitor-insulator layer is successively etched partway under the same etching condition as that of the upper conductive layer. Next, second resist pattern is formed, the remaining part of the capacitor-insulator layer is etched to form a second insulation layer, and the lower conductive layer is successively etched under the same etching condition as that of the capacitor-insulator layer so as to form a lower electrode and a lower wiring. In this manner, an MiM capacitor element constituted by the upper electrode, a part of the second insulation layer, and the lower electrode can be fabricated.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: October 7, 2008
    Assignee: NEC Electronics Corporation
    Inventors: Hiroaki Ohkubo, Ryota Yamamoto, Masayuki Furumiya, Masaharu Sato, Kuniko Kikuta, Makoto Nakayama, Yasutaka Nakashiba
  • Patent number: 7239002
    Abstract: In a temperature sensor section of a semiconductor integrated circuit device, first vias of tungsten are formed at the topmost layer of a multi-layer wiring layer and pads of titanium are provided on regions of the multi-layer wiring layer which covers the vias. An insulating layer is provided in such a way as to cover the multi-layer wiring layer and the pads, second vias are so formed as to reach the pads. Vanadium oxide is buried in the second vias by reactive sputtering, and a temperature monitor part of vanadium oxide is provided in such a way as to connect the second vias each other. Accordingly, the temperature monitor part is connected between the two wires.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: July 3, 2007
    Assignees: NEC Electronics Corporation, NEC Corporation
    Inventors: Hiroaki Ohkubo, Kuniko Kikuta, Yasutaka Nakashiba, Naoyoshi Kawahara, Hiroshi Murase, Naoki Oda, Tokuhito Sasaki, Nobukazu Ito
  • Publication number: 20070148825
    Abstract: A lower interconnection is provided on a semiconductor substrate. A MIM capacitive element is provided on a first interlayer insulation film in which the lower interconnection is buried, and includes a lower electrode, an upper electrode, and a dielectric film sandwiched therebetween. An upper interconnection is provided on a second interlayer insulation film in which the MIM capacitive element is buried. A contact electrically connects the lower electrode and the upper interconnection. The lower electrode is mainly formed of Al, so that they are lower in electrical resistance than barrier metal, and also low in stress value. Therefore, it becomes possible to widen the area of the lower electrode for electrically connecting the contact while restraining their influences on charge accumulation and close contact between the lower electrode and the insulation film. In addition, since the electrical resistance is lowered, the thickness of the lower electrode can be increased.
    Type: Application
    Filed: March 5, 2007
    Publication date: June 28, 2007
    Applicant: NEC ELECTRONICS CORPORATION
    Inventors: Kuniko KIKUTA, Makoto NAKAYAMA
  • Patent number: 7202567
    Abstract: A lower interconnection is provided on a semiconductor substrate. A MIM capacitive element is provided on a first interlayer insulation film in which the lower interconnection is buried, and includes a lower electrode, an upper electrode, and a dielectric film sandwiched therebetween. An upper interconnection is provided on a second interlayer insulation film in which the MIM capacitive element is buried. A contact electrically connects the lower electrode and the upper interconnection. The lower electrode is mainly formed of Al, so that they are lower in electrical resistance than barrier metal, and also low in stress value. Therefore, it becomes possible to widen the area of the lower electrode for electrically connecting the contact while restraining their influences on charge accumulation and close contact between the lower electrode and the insulation film. In addition, since the electrical resistance is lowered, the thickness of the lower electrode can be increased.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: April 10, 2007
    Assignee: NEC Electronics Corporation
    Inventors: Kuniko Kikuta, Makoto Nakayama
  • Patent number: 7154158
    Abstract: As for the resistor on the semiconductor substrate, it is required to achieve obtaining a metal resistor, which can be formed in the latter half of a preliminary process for manufacturing a semiconductor, in addition to forming a polysilicon resistor, which is formed in the first half of the preliminary process. A capacitor having MIM structure comprises a lower electrode, a capacitive insulating film and an upper electrode, all of which are sequentially formed in this sequence. A resistor structure having MIM structure also comprises a lower electrode, a capacitive insulating film and a resistor, all of which are sequentially formed in this sequence. In this case, the biasing conditions thereof should be selected so that the resistor structure lower electrode of the MIM structure resistor is not coupled to any electric potential, and is in a floating condition.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: December 26, 2006
    Assignee: NEC Electronics Corporation
    Inventors: Kuniko Kikuta, Makoto Nakayama
  • Publication number: 20060261425
    Abstract: A magnetic memory includes a substrate, a lower portion structure of a magnetic element, an upper portion structure of the magnetic element, and a sidewall insulating film. The lower portion structure of the magnetic element is a portion of the magnetic element provided on the upside of the substrate. The upper portion structure of the magnetic element is a remaining portion of the magnetic element provided on the upside of the lower portion structure of the magnetic element. The sidewall insulating film is provided to surround the upper portion structure of the magnetic element and is formed of an insulating material. That is, the lower portion structure of the magnetic element is formed from one layer or a plurality of layers on a side close to the substrate, among a plurality of laminated films of the magnetic element provided on the upside of the substrate.
    Type: Application
    Filed: September 19, 2003
    Publication date: November 23, 2006
    Applicant: NEC CORPORATION
    Inventors: Katsumi Suemitsu, Kuniko Kikuta
  • Publication number: 20060237819
    Abstract: A semiconductor device includes a capacitor with an MIM structure, by which the dimensional accuracy of the device is improved, and a stable capacitance value is given. The semiconductor device 100 includes: a semiconductor substrate 102; a capacitor forming region 130 in which an MIM capacitor is formed, which has an insulating interlayer 104 formed on the semiconductor substrate 102, a first electrode 110, and a second electrode 112, and the first electrode 110 and the second electrode 112 are arranged facing each other through the insulating interlayer 104; and a shielding region 132 which includes a plurality of shielding electrodes 114 formed in the outer edge of the capacitor forming region 130 and, at the same time, set at a predetermined potential in the same layer as that of the MIM capacitor on the semiconductor substrate 102, and shields the capacitor forming region 130 from other regions.
    Type: Application
    Filed: April 20, 2006
    Publication date: October 26, 2006
    Applicant: NEC ELECTRONICS CORPORATION
    Inventors: Kuniko Kikuta, Masayuki Furumiya, Ryota Yamamoto, Makoto Nakayama
  • Publication number: 20060180871
    Abstract: An N-type deep well is used to protect a circuit from a noise. However, a noise with a high frequency propagates through the N-type deep well, and as a result, the circuit that should be protected malfunctions. To reduce the area of the N-type deep well. For instance, in the present invention, a semiconductor device comprises a semiconductor substrate of a first conductivity type, a digital circuit part and an analog circuit part provided on the semiconductor substrate, a plurality of wells of the first conductivity type formed in either the analog circuit part or the digital circuit part, and a first deep well of a second conductivity type, which is the opposite conductivity type to the first conductivity type, isolating some of the plurality of wells from the semiconductor substrate.
    Type: Application
    Filed: January 25, 2006
    Publication date: August 17, 2006
    Applicant: NEC ELECTRONICS CORPORATION
    Inventors: Ryota Yamamoto, Kuniko Kikuta