Patents by Inventor Yusuke Kohyama

Yusuke Kohyama 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: 7615813
    Abstract: A first concave portion for the element isolation, a second concave portion for an aligning mark, and a third concave portion for an anti-fuse portion are formed simultaneously within a silicon substrate. After a silicon oxide film is formed on the entire surface, the silicon oxide film positioned within the second and third concave portions is removed. Then, a gate insulating film is formed on the entire surface, followed by forming a polysilicon film on the gate insulating film. Further, these polysilicon film and gate insulating film are selectively removed to form a gate electrode above an element region, an aligning mark portion in the second concave portion, and a gate electrode for an anti-fuse portion on the bottom surface of the third concave portion.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: November 10, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshiaki Fukuzumi, Yusuke Kohyama
  • Patent number: 7605042
    Abstract: Semiconductor device structures, and methods for making such structures, are described that provide for fully-doped transistor source/drain regions while reducing or even avoiding boron penetration into the transistor channel, thereby improving the performance of the transistor. In addition, such a transistor may benefit from an SiGe layer that applies compressive stress to the transistor channel, thereby further improving the performance of the transistor.
    Type: Grant
    Filed: April 18, 2005
    Date of Patent: October 20, 2009
    Assignee: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Patent number: 7550355
    Abstract: A boron ion stream may be used to implant ions, such as boron ions, into the sidewalls of an active area, such as an NFET active area. The boron ion stream has both vertical tilt and horizontal rotation components relative to the sidewalls and/or the silicon device, to provide a better line of sight onto the sidewalls. This may allow components of the silicon device to be moved closer together without unduly reducing the effectiveness of boron doping of NFET active area sidewalls, and provides an improved line of sight of a boron ion stream onto the sidewalls of an NFET active area prior to filling the surrounding trench with STI material.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: June 23, 2009
    Assignee: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Patent number: 7537981
    Abstract: An isolated semiconductor device and method for producing the isolated semiconductor device in which the device includes a silicon-on-insulator (SOI) device formed on a substrate. A dielectric film is formed on the insulator and covers the SOI device. The dielectric film may be a single film or a multilayer film. The silicon layer of the SOI device may include a channel region and source/drain regions. The SOI device may further include a gate insulator disposed on the channel region of the silicon layer, a gate disposed on the gate insulator and sidewall spacers formed a side surface of the gate. The dielectric film may also be disposed on an edge portion of the silicon layer. The device structure may further include metallization lines connecting through the isolation dielectric to the gate and to the source/drain regions.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: May 26, 2009
    Assignee: Kabuhsiki Kaisha Toshiba
    Inventor: Yusuke Kohyama
  • Patent number: 7514752
    Abstract: Methods and apparatus are described that reduce the possibility that unintended subway short-circuits will occur between contacts of different potentials along the boundary between tensile and compressive liners (the T-C boundary). This may be done without unduly increasing the size of the semiconductor device, or even increasing the size at all over previous designs. For example, simply by adjusting the layout of the device, the contacts of two different common gates may be offset in opposing directions relative to the T-C boundary. Or, by forming a T-C boundary having a zigzag or other similar pattern, the contacts may be arranged even closer together while still reducing the likelihood of short-circuiting subways forming. Such layout adjustments do not otherwise require any additional steps or cost.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: April 7, 2009
    Assignee: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Publication number: 20090014762
    Abstract: The present invention provides a solid-state image pickup device including an image pickup pixel section which is provided on a semiconductor substrate and in which a plurality of pixels each having a photoelectric conversion element and a field-effect transistor are arranged, and a peripheral circuit section for the image pickup pixel section. An interconnect layer driving the field-effect transistor in the image pickup pixel section is formed on a first surface side of the semiconductor substrate. A light receiving surface of the photoelectric conversion element is located on a second surface side of the semiconductor substrate. The solid-state image pickup device includes a first terminal exposed from the second surface side of the semiconductor substrate, and a second terminal electrically connected to the first terminal and connectable to an external device on the first surface side of the semiconductor substrate.
    Type: Application
    Filed: July 2, 2008
    Publication date: January 15, 2009
    Inventors: Mie MATSUO, Yusuke Kohyama
  • Publication number: 20080012057
    Abstract: A first concave portion for the element isolation, a second concave portion for an aligning mark, and a third concave portion for an anti-fuse portion are formed simultaneously within a silicon substrate. After a silicon oxide film is formed on the entire surface, the silicon oxide film positioned within the second and third concave portions is removed. Then, a gate insulating film is formed on the entire surface, followed by forming a polysilicon film on the gate insulating film. Further, these polysilicon film and gate insulating film are selectively removed to form a gate electrode above an element region, an aligning mark portion in the second concave portion, and a gate electrode for an anti-fuse portion on the bottom surface of the third concave portion.
    Type: Application
    Filed: September 21, 2007
    Publication date: January 17, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshiaki Fukuzumi, Yusuke Kohyama
  • Publication number: 20070184589
    Abstract: An isolated semiconductor device and method for producing the isolated semiconductor device in which the device includes a silicon-on-insulator (SOI) device formed on a substrate. A dielectric film is formed on the insulator and covers the SOI device. The dielectric film may be a single film or a multilayer film. The silicon layer of the SOI device may include a channel region and source/drain regions. The SOI device may further include a gate insulator disposed on the channel region of the silicon layer, a gate disposed on the gate insulator and sidewall spacers formed a side surface of the gate. The dielectric film may also be disposed on an edge portion of the silicon layer. The device structure may further include metallization lines connecting through the isolation dielectric to the gate and to the source/drain regions.
    Type: Application
    Filed: April 17, 2007
    Publication date: August 9, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Yusuke KOHYAMA
  • Patent number: 7235882
    Abstract: In a semiconductor device, a wiring pattern groove is formed in a surface portion of a silicon oxide film provided above a semiconductor substrate. A wiring layer is buried into the wiring pattern groove with a barrier metal film interposed therebetween. The barrier metal film is selectively removed from each sidewall portion of the wiring pattern groove. In other words, the barrier metal film is left only on the bottom of the wiring pattern groove. Thus, a damascene wiring layer having a hollow section whose dielectric constant is low between each sidewall of the wiring pattern groove and each side of the wiring layer can be formed in the semiconductor device.
    Type: Grant
    Filed: May 5, 2005
    Date of Patent: June 26, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroyuki Nitta, Yoshiaki Fukuzumi, Yusuke Kohyama
  • Patent number: 7227228
    Abstract: An isolated semiconductor device and method for producing the isolated semiconductor device in which the device includes a silicon-on-insulator (SOI) device formed on a substrate. A dielectric film is formed on the insulator and covers the SOI device. The dielectric film may be a single film or a multilayer film. The silicon layer of the SOI device may include a channel region and source/drain regions. The SOI device may further include a gate insulator disposed on the channel region of the silicon layer, a gate disposed on the gate insulator and sidewall spacers formed a side surface of the gate. The dielectric film may also be disposed on an edge portion of the silicon layer. The device structure may further include metallization lines connecting through the isolation dielectric to the gate and to the source/drain regions.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: June 5, 2007
    Assignee: Kabushika Kaisha Toshiba
    Inventor: Yusuke Kohyama
  • Publication number: 20070108526
    Abstract: Improved ways of controlling the boundaries between the compressive and tensile portions of a dual-stress liner in a semiconductor device are described. The boundaries may be appropriately designed to be located by a predetermined distance as measured from a PFET feature, such as the channel or the active area boundary, as opposed to being dictated by the N-well boundaries. This may provide the opportunity to improve and/or match PFET performance. By appropriately designing the boundaries between the compressive and tensile portions of the dual-stress liner, the compressive stress on a PFET may be reduced in the y direction while maintained or even increased in the x direction, potentially resulting in improved PFET performance.
    Type: Application
    Filed: November 14, 2005
    Publication date: May 17, 2007
    Applicant: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Patent number: 7187027
    Abstract: First and second wirings are formed on a first insulating film. Each of the wirings is arranged so that a conductive film, a silicon oxide film and a silicon nitride film are laminated. Thereafter, a silicon oxide insulating film is formed on the whole surface. The silicon oxide insulating film is etched so that a contact hole is formed between the first and second wirings. Since the silicon oxide film and the silicon nitride film exist on the conductive film of each wiring, the conductive film is not exposed at the time of etching. Thereafter, an insulating film is formed on a side wall of the contact hole, and the conductive film exposed through the contact hole is covered by the insulating film.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: March 6, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yusuke Kohyama, Takashi Ohsawa, Shizuo Sawada
  • Publication number: 20070048967
    Abstract: A boron ion stream may be used to implant ions, such as boron ions, into the sidewalls of an active area, such as an NFET active area. The boron ion stream has both vertical tilt and horizontal rotation components relative to the sidewalls and/or the silicon device, to provide a better line of sight onto the sidewalls. This may allow components of the silicon device to be moved closer together without unduly reducing the effectiveness of boron doping of NFET active area sidewalls, and provides an improved line of sight of a boron ion stream onto the sidewalls of an NFET active area prior to filling the surrounding trench with STI material.
    Type: Application
    Filed: August 29, 2005
    Publication date: March 1, 2007
    Applicant: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Publication number: 20070045747
    Abstract: Methods and apparatus are described that reduce the possibility that unintended subway short-circuits will occur between contacts of different potentials along the boundary between tensile and compressive liners (the T-C boundary). This may be done without unduly increasing the size of the semiconductor device, or even increasing the size at all over previous designs. For example, simply by adjusting the layout of the device, the contacts of two different common gates may be offset in opposing directions relative to the T-C boundary. Or, by forming a T-C boundary having a zigzag or other similar pattern, the contacts may be arranged even closer together while still reducing the likelihood of short-circuiting subways forming. Such layout adjustments do not otherwise require any additional steps or cost.
    Type: Application
    Filed: August 26, 2005
    Publication date: March 1, 2007
    Applicant: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Patent number: 7163894
    Abstract: In a semiconductor device, a wiring pattern groove is formed in a surface portion of a silicon oxide film provided above a semiconductor substrate. A wiring layer is buried into the wiring pattern groove with a barrier metal film interposed therebetween. The barrier metal film is selectively removed from each sidewall portion of the wiring pattern groove. In other words, the barrier metal film is left only on the bottom of the wiring pattern groove. Thus, a damascene wiring layer having a hollow section whose dielectric constant is low between each sidewall of the wiring pattern groove and each side of the wiring layer can be formed in the semiconductor device.
    Type: Grant
    Filed: August 27, 2004
    Date of Patent: January 16, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroyuki Nitta, Yoshiaki Fukuzumi, Yusuke Kohyama
  • Publication number: 20060234432
    Abstract: Semiconductor device structures, and methods for making such structures, are described that provide for fully-doped transistor source/drain regions while reducing or even avoiding boron penetration into the transistor channel, thereby improving the performance of the transistor.
    Type: Application
    Filed: April 18, 2005
    Publication date: October 19, 2006
    Applicant: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Publication number: 20060231826
    Abstract: A device, and method for manufacturing the same, including a PFET having an embedded SiGe layer where a shallow portion of the SiGe layer is closer to the PFET channel and a deep portion of the SiGe layer is further from the PFET channel. Thus, the SiGe layer has a boundary on the side facing toward the channel that is tapered. Such a configuration may allow the PFET channel to be compressively stressed by a large amount without necessarily substantially degrading extension junction characteristics. The tapered SiGe boundary may be configured as a plurality of discrete steps. For example, two, three, or more discrete steps may be formed.
    Type: Application
    Filed: April 18, 2005
    Publication date: October 19, 2006
    Applicant: Toshiba America Electronic Components, Inc.
    Inventor: Yusuke Kohyama
  • Patent number: 7075169
    Abstract: A hollow region is formed in a silicon substrate. A plurality of openings formed in the silicon layer on the hollow region is filled with a buried film. The bottom portion of the hollow region is formed with a plurality of silicon pillars, which support the silicon layer.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: July 11, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Minami, Takashi Yamada, Yusuke Kohyama, Tsutomu Sato, Hajime Nagano
  • Publication number: 20060124980
    Abstract: First and second wirings are formed on a first insulating film. Each of the wirings is arranged so that a conductive film, a silicon oxide film and a silicon nitride film are laminated. Thereafter, a silicon oxide insulating film is formed on the whole surface. The silicon oxide insulating film is etched so that a contact hole is formed between the first and second wirings. Since the silicon oxide film and the silicon nitride film exist on the conductive film of each wiring, the conductive film is not exposed at the time of etching. Thereafter, an insulating film is formed on a side wall of the contact hole, and the conductive film exposed through the contact hole is covered by the insulating film.
    Type: Application
    Filed: January 18, 2006
    Publication date: June 15, 2006
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yusuke Kohyama, Takashi Ohsawa, Shizuo Sawada
  • Publication number: 20060084273
    Abstract: A gate insulation film is formed on a semiconductor substrate, gate electrodes are formed on the gate insulation film, and source/drain diffusion layers are formed. A silicon nitride films is formed on a side wall of the gate electrodes, a silicon oxide film is formed on the overall surface, and the silicon oxide film is etched back to have the same height as that of the gate electrodes so that the surface is flattened, and then the surface of the gate electrodes are etched by a predetermined thickness to form a first stepped portion from the silicon oxide film, the first stepped portion is filled up by a tungsten film, the surface of the tungsten film is etched by a predetermined thick ness so that a second stepped portion is formed, and then the second stepped portion is filled by a silicon nitride films.
    Type: Application
    Filed: November 10, 2005
    Publication date: April 20, 2006
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yusuke Kohyama, Nobuo Hayasaka, Katsuya Okumura