Patents by Inventor Takahiro Onai

Takahiro Onai 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: 8436333
    Abstract: A light-emitting device according to the present invention includes a first electrode unit for injecting an electron, a second electrode unit for injecting a hole, and light-emitting units and electrically connected to the first electrode unit and the second electrode unit respectively, wherein the light-emitting units and are formed of single-crystal silicon, the light-emitting units and having a first surface (topside surface) and a second surface (underside surface) opposed to the first surface, plane orientation of the first and second surfaces being set to a (100) plane, thicknesses of the light-emitting units and in a direction orthogonal to the first and second surfaces being made extremely thin.
    Type: Grant
    Filed: April 24, 2007
    Date of Patent: May 7, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Shinichi Saito, Digh Hisamoto, Tadashi Arai, Takahiro Onai
  • Patent number: 7405588
    Abstract: The present invention relates to an LSI in which functions can be changed, and realizes, particularly, a system LSI in which functions are changed by changing connections of the circuit by use of MEMS switches. A bistable MEMS switch which can maintain states, and exhibits optimal stitching property, i.e., the switch has a very small resistance of several ? or less in an on-state, and has an infinite resistance in an off-state; is employed. An element in which functions can be changed during operation, is produced by utilizing a wiring layer of a CMOS semiconductor to form the MEMS switch. A semiconductor device exhibiting high-degree of freedom for changing functions, high-speed, and having small area, is realized.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: July 29, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Takayuki Kawahara, Masayuki Miyazaki, Yasushi Goto, Natsuki Yokoyama, Takahiro Onai
  • Publication number: 20080128713
    Abstract: A light-emitting device according to the present invention includes a first electrode unit 9 for injecting an electron, a second electrode unit 10 for injecting a hole, and light-emitting units 11 and 12 electrically connected to the first electrode unit 9 and the second electrode unit 10 respectively, wherein the light-emitting units 11 and 12 are formed of single-crystal silicon, the light-emitting units 11 and 12 having a first surface (topside surface) and a second surface (underside surface) opposed to the first surface, plane orientation of the first and second surfaces being set to a (100) plane, thicknesses of the light-emitting units 11 and 12 in a direction orthogonal to the first and second surfaces being made extremely thin.
    Type: Application
    Filed: April 24, 2007
    Publication date: June 5, 2008
    Inventors: Shinichi Saito, Digh Hisamoto, Tadashi Arai, Takahiro Onai
  • Patent number: 7042051
    Abstract: Provided is a manufacturing method of a semiconductor device which comprises forming, all over the surface of a substrate below the channel region of a MISFET, a p type impurity layer having a first peak in impurity concentration distribution and another p type impurity layer having a second peak in impurity concentration distribution, each layer having a function of preventing punch-through. Compared with a device having a punch through stopper layer of a pocket structure, the device of the present invention is suppressed in fluctuations in the threshold voltage. Moreover, with a relative increase in the controllable width of a depletion layer, a sub-threshold swing becomes small, thereby making it possible to prevent lowering of the threshold voltage and to improve a switching rate of the MISFET.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: May 9, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Fumio Ootsuka, Takahiro Onai, Kazuhiro Ohnishi, Shoji Wakahara
  • Patent number: 7042055
    Abstract: In a miniaturized field effect transistor, the roughness of the interface between a gate dielectric film and a gate electrode is controlled on an atomic scale. The thickness variation of the gate dielectric film is lowered, whereby a field effect transistor with high mobility is manufactured. An increase in the mobility in the field effect transistor can be achieved not only in the case of using a conventional SiO2 thermal oxide film as the gate dielectric film but also in the case of using a high dielectric material for the gate dielectric film.
    Type: Grant
    Filed: June 20, 2002
    Date of Patent: May 9, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Shinichi Saito, Kazuyoshi Torii, Takahiro Onai, Toshiyuki Mine
  • Patent number: 7029988
    Abstract: A method and device are provided for shallow trench isolation for a silicon wafer containing silicon-germanium. In one example, the method comprises forming a trench region in a silicon-germanium layer of a semiconductor substrate containing a single crystal silicon-germanium layer on the surface; forming a first single crystal silicon layer in the trench region and an active region; oxidizing the first single crystal silicon layer; forming a first thermal oxide layer on the surface of the first single crystal silicon layer; forming a device isolation region; embedding an insulator in the trench region; and forming a device in an active region over the single crystal silicon-germanium layer separated by the device isolation region, wherein the step of forming the device in the active region further includes forming a doped region of a depth to reach within the single crystal silicon-germanium layer below the first single crystal silicon layer.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: April 18, 2006
    Assignee: Renesas Technology Corporation
    Inventors: Kazuhiro Ohnishi, Nobuyuki Sugii, Takahiro Onai
  • Patent number: 6982465
    Abstract: The present invention provides a semiconductor device including n-channel field effect transistors and p-channel field effect transistors all of which have excellent drain current characteristics. In a semiconductor device including an n-channel field effect transistor 10 and a p-channel field effect transistor 30, a stress control film 19 covering a gate electrode 15 of the n-channel field effect transistor 10 undergoes film stress mainly composed of tensile stress. A stress control film 39 covering a gate electrode 15 of the p-channel field effect transistor 30 undergoes film stress mainly caused by compression stress compared to the film 19 of the n-channel field effect transistor 10. Accordingly, drain current is expected to be improved in both the n-channel field effect transistor and the p-channel field effect transistor. Consequently, the characteristics can be generally improved.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: January 3, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Yukihiro Kumagai, Hiroyuki Ohta, Fumio Ootsuka, Shuji Ikeda, Takahiro Onai, Hideo Miura, Katsuhiko Ichinose, Toshifumi Takeda
  • Publication number: 20050139867
    Abstract: The Mott transistor capable of operating at a room temperature can be realized by using a self-organized nanoparticle array for the channel portion. The nanoparticle used in the present invention comprises metal and organic molecules, and the size thereof is extremely small, that is, about a few nm. Therefore, the charging energy is sufficiently larger than the thermal energy kBT=26 meV, and the transistor can operate at a room temperature. Also, since the nanoparticles with a diameter of a few nm are arranged in a self-organized manner and the Mott transition can be caused by the change of a number of electrons of the surface density of about 1012 cm?2, the transistor can operate by the gate voltage of about several V.
    Type: Application
    Filed: September 3, 2004
    Publication date: June 30, 2005
    Inventors: Shin-ichi Saito, Tadashi Arai, Digh Hisamoto, Ryuta Tsuchiya, Hiroshi Fukuda, Takahiro Onai
  • Publication number: 20050104621
    Abstract: The present invention relates to an LSI in which functions can be changed, and realizes, particularly, a system LSI in which functions are changed by changing connections of the circuit by use of MEMS switches. A bistable MEMS switch which can maintain states, and exhibits optimal stitching property, i.e., the switch has a very small resistance of several ? or less in an on-state, and has an infinite resistance in an off-state; is employed. An element in which functions can be changed during operation, is produced by utilizing a wiring layer of a CMOS semiconductor to form the MEMS switch. A semiconductor device exhibiting high-degree of freedom for changing functions, high-speed, and having small area, is realized.
    Type: Application
    Filed: September 3, 2004
    Publication date: May 19, 2005
    Inventors: Takayuki Kawahara, Masayuki Miyazaki, Yasushi Goto, Natsuki Yokoyama, Takahiro Onai
  • Patent number: 6878606
    Abstract: A method and device are provided for shallow trench isolation for a silicon wafer containing silicon-germanium. In one example, the method comprises forming a trench region in a silicon-germanium layer of a semiconductor substrate containing a single crystal silicon-germanium layer on the surface; forming a first single crystal silicon layer in the trench region and an active region; oxidizing the first single crystal silicon layer; forming a first thermal oxide layer on the surface of the first single crystal silicon layer; forming a device isolation region; embedding an insulator in the trench region; and forming a device in an active region over the single crystal silicon-germanium layer separated by the device isolation region, wherein the step of forming the device in the active region further includes forming a doped region of a depth to reach within the single crystal silicon-germanium layer below the first single crystal silicon layer.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: April 12, 2005
    Assignee: Renesas Technology Corp.
    Inventors: Kazuhiro Ohnishi, Nobuyuki Sugii, Takahiro Onai
  • Publication number: 20050032327
    Abstract: A method and device are provided for shallow trench isolation for a silicon wafer containing silicon-germanium. In one example, the method comprises forming a trench region in a silicon-germanium layer of a semiconductor substrate containing a single crystal silicon-germanium layer on the surface; forming a first single crystal silicon layer in the trench region and an active region; oxidizing the first single crystal silicon layer; forming a first thermal oxide layer on the surface of the first single crystal silicon layer; forming a device isolation region; embedding an insulator in the trench region; and forming a device in an active region over the single crystal silicon-germanium layer separated by the device isolation region, wherein the step of forming the device in the active region further includes forming a doped region of a depth to reach within the single crystal silicon-germanium layer below the first single crystal silicon layer.
    Type: Application
    Filed: September 9, 2004
    Publication date: February 10, 2005
    Inventors: Kazuhiro Ohnishi, Nobuyuki Sugii, Takahiro Onai
  • Publication number: 20040121554
    Abstract: A method and device are provided for shallow trench isolation for a silicon wafer containing silicon-germanium. In one example, the method comprises forming a trench region in a silicon-germanium layer of a semiconductor substrate containing a single crystal silicon-germanium layer on the surface; forming a first single crystal silicon layer in the trench region and an active region; oxidizing the first single crystal silicon layer; forming a first thermal oxide layer on the surface of the first single crystal silicon layer; forming a device isolation region; embedding an insulator in the trench region; and forming a device in an active region over the single crystal silicon-germanium layer separated by the device isolation region, wherein the step of forming the device in the active region further includes forming a doped region of a depth to reach within the single crystal silicon-germanium layer below the first single crystal silicon layer.
    Type: Application
    Filed: May 28, 2003
    Publication date: June 24, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Kazuhiro Ohnishi, Nobuyuki Sugii, Takahiro Onai
  • Publication number: 20040075148
    Abstract: The present invention provides a semiconductor device including n-channel field effect transistors and p-channel field effect transistors all of which have excellent drain current characteristics.
    Type: Application
    Filed: June 6, 2003
    Publication date: April 22, 2004
    Inventors: Yukihiro Kumagai, Hiroyuki Ohta, Fumio Ootsuka, Shuji Ikeda, Takahiro Onai, Hideo Miura, Katsuhiko Ichinose, Toshifumi Takeda
  • Patent number: 6667199
    Abstract: The present invention provides a MISFET with a replacement gate electrode, which ensures large ON-current. A semiconductor device, in which on the substrate, first and second field effect transistors are formed, the first field effect transistor is a replacement gate type field effect transistor, and the length of the overlap between a gate electrode and a source/drain diffusion zone of the first field effect transistor correspond to that between a gate electrode and a source/drain diffusion zone of the second field effect transistor.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: December 23, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Kazuyoshi Torii, Ryuta Tsuchiya, Masatada Horiuchi, Takahiro Onai
  • Publication number: 20030094627
    Abstract: Provided is a manufacturing method of a semiconductor device which comprises forming, all over the surface of a substrate below the channel region of a MISFET, a p type impurity layer having a first peak in impurity concentration distribution and another p type impurity layer having a second peak in impurity concentration distribution, each layer having a function of preventing punch-through. Compared with a device having a punch through stopper layer of a pocket structure, the device of the present invention is suppressed in fluctuations in the threshold voltage. Moreover, with a relative increase in the controllable width of a depletion layer, a sub-threshold swing becomes small, thereby making it possible to prevent lowering of the threshold voltage and to improve a switching rate of the MISFET.
    Type: Application
    Filed: November 19, 2002
    Publication date: May 22, 2003
    Inventors: Fumio Ootsuka, Takahiro Onai, Kazuhiro Ohnishi, Shoji Wakahara
  • Publication number: 20030042535
    Abstract: In a miniaturized field effect transistor, the roughness of the interface between a gate dielectric film and a gate electrode is controlled on an atomic scale. The thickness variation of the gate dielectric film is lowered, whereby a field effect transistor with high mobility is manufactured. An increase in the mobility in the field effect transistor can be achieved not only in the case of using a conventional SiO2 thermal oxide film as the gate dielectric film but also in the case of using a high dielectric material for the gate dielectric film.
    Type: Application
    Filed: June 20, 2002
    Publication date: March 6, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Shinichi Saito, Kazuyoshi Torii, Takahiro Onai, Toshiyuki Mine
  • Patent number: 6524903
    Abstract: A method of manufacture of a semiconductor device calls for forming, all over the surface of a substrate below the channel region of a MISFET, a p type impurity layer having a first peak in impurity concentration distribution and another p type impurity layer having a second peak in impurity concentration distribution, each layer having a function of preventing punch-through. Compared with a device having a punch through stopper layer with a pocket structure, the device produced by the present method operates in such a way that fluctuations in the threshold voltage are suppressed. Moreover, with a relative increase in the controllable width of a depletion layer, the sub-threshold swing becomes small, thereby making it possible to prevent lowering of the threshold voltage and to improve the switching rate of the MISFET.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: February 25, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Ootsuka, Takahiro Onai, Kazuhiro Ohnishi, Shoji Wakahara
  • Publication number: 20030025551
    Abstract: A reference voltage generator to operate under the supply voltage of 1V or less is provided. In order to output a reference voltage, the change as caused by the ambient temperature of the forward bias voltage of any one of the plural Schottky diodes is compensated with the difference in the forward bias voltage between said plural Schottky diodes. The semiconductor region corresponding to the Schottky contact interface is formed in the same process as for an N well region corresponding to the channel region of the PMOS transistor or for a P well region corresponding to the channel region of the NMOS transistor and the metallic region thereof corresponding to the Schottky contact interface is formed in the same process as for the silicide region comprising the contact region of the MOS transistor.
    Type: Application
    Filed: May 29, 2002
    Publication date: February 6, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Naoki Kobayashi, Takayuki Kawahara, Takahiro Onai, Hideaki Kurata
  • Publication number: 20030022422
    Abstract: The present invention provides a MISFET with a replacement gate electrode, which ensures large ON-current.
    Type: Application
    Filed: February 25, 2002
    Publication date: January 30, 2003
    Inventors: Kazuyoshi Torii, Ryuta Tsuchiya, Masatada Horiuchi, Takahiro Onai
  • Publication number: 20020043665
    Abstract: Provided is a manufacturing method of a semiconductor device which comprises forming, all over the surface of a substrate below the channel region of a MISFET, a p type impurity layer having a first peak in impurity concentration distribution and another p type impurity layer having a second peak in impurity concentration distribution, each layer having a function of preventing punch-through. Compared with a device having a punch through stopper layer of a pocket structure, the device of the present invention is suppressed in fluctuations in the threshold voltage. Moreover, with a relative increase in the controllable width of a depletion layer, a sub-threshold swing becomes small, thereby making it possible to prevent lowering of the threshold voltage and to improve a switching rate of the MISFET.
    Type: Application
    Filed: September 28, 2001
    Publication date: April 18, 2002
    Inventors: Fumio OOtsuka, Takahiro Onai, Kazuhiro Ohnishi, Shoji Wakahara