Patents by Inventor Atsushi Yagishita

Atsushi Yagishita 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: 20080006884
    Abstract: A semiconductor device includes a MISFET, the MISFET having a shallow trench insulator (STI) formed in a surface layer of a semiconductor substrate to define a device forming region, a gate electrode formed above the device forming region via a gate insulating film, impurity diffusion layers composing a source and a drain formed in the surface layer of the device forming region using SiGe so as to sandwich the gate electrode, and a first metal silicide formed on the surfaces of the impurity diffusion layers. The surface height of the STI is substantially the same as the height of the first metal silicide.
    Type: Application
    Filed: May 23, 2007
    Publication date: January 10, 2008
    Inventor: Atsushi Yagishita
  • Patent number: 7314787
    Abstract: A manufacturing method of a semiconductor device disclosed herein comprises: forming a convex first protrusion; forming a first film, of which a surface is higher than the first protrusion; forming a mask portion on the first film; and etching the first film with the mask portion as a mask.
    Type: Grant
    Filed: February 16, 2005
    Date of Patent: January 1, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Atsushi Yagishita
  • Publication number: 20070290223
    Abstract: A semiconductor memory device includes an insulating film formed on a semiconductor substrate, a fin-shaped semiconductor layer formed on the insulating film, and having first and second side surfaces opposing each other, a gate electrode formed across the first side surface and second side surface of the semiconductor layer, a trap layer formed between the gate electrode and the first side surface of the semiconductor layer, a tunnel gate insulating film formed between the trap layer and the first and second side surfaces of the semiconductor layer, a block layer formed between the trap layer and the gate electrode, a channel region formed in the semiconductor layer below the gate electrode, and a source and drain regions formed in the semiconductor layer to sandwich the channel region and containing a metal, a Schottky junction being formed between the channel region and each of the source and drain regions.
    Type: Application
    Filed: May 25, 2007
    Publication date: December 20, 2007
    Inventor: Atsushi Yagishita
  • Publication number: 20070252211
    Abstract: A semiconductor device that has a pMOS double-gate structure, has a substrate, the crystal orientation of the top surface of which is (100), a semiconductor layer that is made of silicon or germanium, formed on the substrate such that currents flow in a direction of a first <110> crystal orientation, and channels are located at sidewall of the semiconductor layer, a source layer that is formed on the substrate adjacent to one end of the semiconductor layer in the direction of first <110> crystal orientation and is made of a metal or metal silicide to form a Schottky junction with the semiconductor layer; a drain layer that is formed on the substrate adjacent to the other end of the semiconductor layer in the direction of first <110> crystal orientation and is made of a metal or metal silicide to form a Schottky junction with the semiconductor layer; a gate electrode that is formed on the semiconductor layer in a direction of a second <110> crystal orientation perpendicular to the curre
    Type: Application
    Filed: April 25, 2007
    Publication date: November 1, 2007
    Inventor: Atsushi Yagishita
  • Publication number: 20070243677
    Abstract: A semiconductor device comprises an island shaped channel layer formed on a substrate, the channel later being composed of a semiconductor material, a gate insulation film formed on the channel layer, a gate electrode formed on the gate insulation film, an insulation film formed on both side faces opposite to one direction of the channel layer, a source electrode and a drain electrode made of a metal material and formed on a side face of the insulation layer.
    Type: Application
    Filed: June 11, 2007
    Publication date: October 18, 2007
    Inventor: Atsushi Yagishita
  • Publication number: 20070235819
    Abstract: There is provided a semiconductor device including: convex semiconductor layers formed on a semiconductor substrate via an insulating film; gate electrodes formed on a pair of facing sides of the semiconductor layers via a gate insulating film; a channel region formed of silicon between the gate electrodes in the semiconductor layers; a source extension region and a drain extension region formed of silicon germanium or silicon carbon on both sides of the channel region in the semiconductor layers; and a source region formed of silicon so as to adjoin to the opposite side of the channel region in the source extension region, and a drain region formed of silicon so as to adjoin to the opposite side of the channel region in the drain extension region in the semiconductor layers.
    Type: Application
    Filed: March 13, 2007
    Publication date: October 11, 2007
    Inventor: Atsushi Yagishita
  • Publication number: 20070190708
    Abstract: The disclosure concerns a method of manufacturing a semiconductor device including forming a plurality of fins made of a semiconductor material on an insulating layer; forming a gate insulating film on side surfaces of the plurality of fins; and forming a gate electrode on the gate insulating film in such a manner that a compressive stress is applied to a side surface of a first fin which is used in an NMOSFET among the plurality of fins in a direction perpendicular to the side surface and a tensile stress is applied to a side surface of a second fin which is used in a PMOSFET among the plurality of fins in a direction perpendicular to the side surface.
    Type: Application
    Filed: January 31, 2007
    Publication date: August 16, 2007
    Inventors: Akio Kaneko, Atsushi Yagishita, Satoshi Inaba
  • Publication number: 20070176237
    Abstract: A semiconductor device comprises a support layer made of semiconductor, a diffusion layer formed by implanting impurities in a surface layer of the support layer, a buried insulating layer provided on the diffusion layer, an island-like active layer provided on the buried insulating layer, a channel region formed in the active layer, source and drain regions formed in the active layer, sandwiching the channel region, a gate insulating film formed on the channel region, a gate electrode formed on the gate insulating film and on side surfaces of the island-like active layer, and insulated and isolated from the channel, source, and drain regions, and an electrode connected to the active layer.
    Type: Application
    Filed: March 13, 2007
    Publication date: August 2, 2007
    Inventors: Atsushi Yagishita, Ichiro Mizushima, Tsutomu Sato
  • Publication number: 20070172997
    Abstract: There is provided a semiconductor device including a substrate, a device isolation insulating film formed on the substrate, a gate electrode formed on the substrate, a gate wiring layer formed in the device isolation insulating film and connected to the gate electrode, source and drain electrodes arranged on the substrate to face each other via the gate electrode, and an insulating film covering bottom and side surfaces of each of the gate electrode and the gate wiring layer, wherein the gate, source and drain electrodes and gate wiring layer have upper surface levels equal to or lower than that of the device isolation insulating film.
    Type: Application
    Filed: March 9, 2007
    Publication date: July 26, 2007
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Atsushi Yagishita, Kouji Matsuo, Yasushi Akasaka, Kyoichi Suguro, Yoshitaka Tsunashima
  • Patent number: 7247913
    Abstract: A semiconductor device comprises an island shaped channel layer formed on a substrate, the channel later being composed of a semiconductor material, a gate insulation film formed on the channel layer, a gate electrode formed on the gate insulation film, an insulation film formed on both side faces opposite to one direction of the channel layer, a source electrode and a drain electrode made of a metal material and formed on a side face of the insulation layer.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: July 24, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Atsushi Yagishita
  • Patent number: 7242064
    Abstract: In a semiconductor device in which the gate electrode of a MISFET formed on a semiconductor substrate is electrically connected to a well region under the channel of the MISFET, the MISFET is formed in an island-shaped element region formed on the semiconductor substrate, and electrical connection between the gate electrode of the MISFET and the well region in the semiconductor substrate is done on the side surface of the island-shaped element region.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: July 10, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Atsushi Yagishita, Tomohiro Saito, Toshihiko Iinuma
  • Publication number: 20070148937
    Abstract: Dummy gate patterns 111, 112 are formed on a silicon active layer 103 of an SOI substrate, and thereafter, these dummy gate patterns 111, 112 are removed to form gate grooves 130, 132. A threshold voltage of each transistor is adjusted by etching a silicon active layer 103 in any one of these gate grooves 130, 132 to reduce a thickness of a portion constituting a channel region. This enables the enhancement of freedom degree and so on in circuit designing according to conditions.
    Type: Application
    Filed: February 22, 2007
    Publication date: June 28, 2007
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Atsushi Yagishita, Tomohiro Saito
  • Publication number: 20070148843
    Abstract: This disclosure concerns a manufacturing method of a semiconductor device includes forming a Fin-type body on an insulation layer, the Fin-type body being made of a semiconductor material and having an upper surface covered with a protective film; forming a gate insulation film on side surfaces of the Fin-type body; depositing a gate electrode material so as to cover the Fin-type body; planarizing the gate electrode material; forming a gate electrode by processing the gate electrode material; depositing an interlayer insulation film so as to cover the gate electrode; exposing the upper surface of the gate electrode; depositing a metal layer on the upper surface of the gate electrode; siliciding the gate electrode by reacting the gate electrode with the metal layer; forming a trench on the upper surface of the protective film by removing an unreacted metal in the metal layer; and filling the trench with a conductor.
    Type: Application
    Filed: December 7, 2006
    Publication date: June 28, 2007
    Inventors: Tomohiro Saito, Akio Kaneko, Atsushi Yagishita
  • Publication number: 20070120204
    Abstract: A semiconductor device includes a semiconductor substrate containing silicon, a p-type semiconductor active region formed on the semiconductor substrate, a first gate insulating film containing at least one of Zr and Hf and formed on the p-type semiconductor active region, a first gate electrode formed on the first gate insulating film and formed of first silicide containing silicon and a first metal material and having a work function level lower than the central position of a band gap of the p-type semiconductor active region, and a first source region and first drain region configured by a second silicide containing silicon and the first metal material and formed to sandwich the p-type semiconductor active region.
    Type: Application
    Filed: January 25, 2007
    Publication date: May 31, 2007
    Inventor: Atsushi Yagishita
  • Patent number: 7214576
    Abstract: A manufacturing method of a semiconductor device disclosed herein comprises: forming a first protrusion; forming a second protrusion which is higher than the first protrusion; forming a first sidewall on a side surface of the second protrusion; forming a first film so that a surface of the first film is located lower than the second protrusion; forming a mask on a side surface of the first sidewall on a side surface of the second protrusion which protrudes from the surface of the first film; and etching the first film with the mask so as to form a second sidewall on the side surface of the first sidewall on the side surface of the second protrusion but not to form the second sidewall on a side surface of the first protrusion, the second sidewall being formed of the mask and the first film.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: May 8, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akio Kaneko, Atsushi Yagishita
  • Publication number: 20070099385
    Abstract: The present invention provides a method of manufacturing a semiconductor device, comprising forming an electrode pattern made of silicon on a gate insulating film in an n-MOS region and a p-MOS region of a semiconductor substrate, masking the n-MOS region including the first electrode pattern with a first insulating film pattern, forming a first metal film made of platinum all over the surface, forming a gate electrode consisting of a platinum silicide in the p-MOS region, forming an silicon oxide film on the surface of the gate electrode by oxidation, dissolving away a non-reacting Pt film, removing the first insulating film pattern, masking the p-MOS region including the electrode pattern with a second insulating film pattern, forming a second metal film made of europium all over the surface, and forming a gate electrode consisting of a europium silicide in the n-MOS region.
    Type: Application
    Filed: October 2, 2006
    Publication date: May 3, 2007
    Inventors: Kazuaki Nakajima, Atsushi Yagishita
  • Patent number: 7208353
    Abstract: A semiconductor device comprises a support layer made of semiconductor, a diffusion layer formed by implanting impurities in a surface layer of the support layer, a buried insulating layer provided on the diffusion layer, an island-like active layer provided on the buried insulating layer, a channel region formed in the active layer, source and drain regions formed in the active layer, sandwiching the channel region, a gate insulating film formed on the channel region, a gate electrode formed on the gate insulating film and on side surfaces of the island-like active layer, and insulated and isolated from the channel, source, and drain regions, and an electrode connected to the active layer.
    Type: Grant
    Filed: May 26, 2005
    Date of Patent: April 24, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Atsushi Yagishita, Ichiro Mizushima, Tsutomu Sato
  • Patent number: 7208797
    Abstract: There is provided a semiconductor device including a substrate, a device isolation insulating film formed on the substrate, a gate electrode formed on the substrate, a gate wiring layer formed in the device isolation insulating film and connected to the gate electrode, source and drain electrodes arranged on the substrate to face each other via the gate electrode, and an insulating film covering bottom and side surfaces of each of the gate electrode and the gate wiring layer, wherein the gate, source and drain electrodes and gate wiring layer have upper surface levels equal to or lower than that of the device isolation insulating film.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: April 24, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Atsushi Yagishita, Kouji Matsuo, Yasushi Akasaka, Kyoichi Suguro, Yoshitaka Tsunashima
  • Patent number: 7198994
    Abstract: Dummy gate patterns 111, 112 are formed on a silicon active layer 103 of an SOI substrate, and thereafter, these dummy gate patterns 111, 112 are removed to form gate grooves 130, 132. A threshold voltage of each transistor is adjusted by etching a silicon active layer 103 in any one of these gate, grooves 130, 132 to reduce a thickness of a portion constituting a channel region. This enables the enhancement of freedom degree and so on in circuit designing according to conditions.
    Type: Grant
    Filed: November 19, 2004
    Date of Patent: April 3, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Atsushi Yagishita, Tomohiro Saito
  • Publication number: 20070045736
    Abstract: A gate electrode is arranged in a direction parallel or perpendicular to a specified crystal orientation of a substrate. A first transistor of a first conductivity type has a first active region, which is arranged in a direction perpendicular to the gate electrode. A second transistor of a second conductivity type has a second active region, which is inclined relative to the gate electrode.
    Type: Application
    Filed: November 4, 2005
    Publication date: March 1, 2007
    Inventor: Atsushi Yagishita