Patents by Inventor Tetsuya Shirasu

Tetsuya Shirasu 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: 11011506
    Abstract: A bonded assembly includes a memory die including a three-dimensional memory array located on a first single crystalline semiconductor substrate, and a logic die including a peripheral circuitry located on a second single crystalline semiconductor substrate and bonded to the memory die. The three-dimensional memory array includes word lines and bit lines. The logic die includes field effect transistors having semiconductor channels configured to flow electrical current along a channel direction that is parallel to the bit lines or word lines. Different crystallographic orientations are used for the first and second single crystalline semiconductor substrates. The crystallographic orientations of the first single crystalline semiconductor substrate are selected to minimize stress deformation of the memory chip, while the crystallographic orientations of the second single crystalline semiconductor substrate are selected to maximize device performance of the peripheral circuitry.
    Type: Grant
    Filed: April 14, 2020
    Date of Patent: May 18, 2021
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Naohiro Hosoda, Kazuma Shimamoto, Tetsuya Shirasu, Yuji Fukano, Akio Nishida
  • Publication number: 20200258876
    Abstract: A bonded assembly includes a memory die including a three-dimensional memory array located on a first single crystalline semiconductor substrate, and a logic die including a peripheral circuitry located on a second single crystalline semiconductor substrate and bonded to the memory die. The three-dimensional memory array includes word lines and bit lines. The logic die includes field effect transistors having semiconductor channels configured to flow electrical current along a channel direction that is parallel to the bit lines or word lines. Different crystallographic orientations are used for the first and second single crystalline semiconductor substrates. The crystallographic orientations of the first single crystalline semiconductor substrate are selected to minimize stress deformation of the memory chip, while the crystallographic orientations of the second single crystalline semiconductor substrate are selected to maximize device performance of the peripheral circuitry.
    Type: Application
    Filed: April 14, 2020
    Publication date: August 13, 2020
    Inventors: Naohiro HOSODA, Kazuma SHIMAMOTO, Tetsuya SHIRASU, Yuji FUKANO, Akio NISHIDA
  • Patent number: 10665580
    Abstract: A bonded assembly includes a memory die including a three-dimensional memory array located on a first single crystalline semiconductor substrate, and a logic die including a peripheral circuitry located on a second single crystalline semiconductor substrate and bonded to the memory die. The three-dimensional memory array includes word lines and bit lines. The logic die includes field effect transistors having semiconductor channels configured to flow electrical current along a channel direction that is parallel to the bit lines or word lines. Different crystallographic orientations are used for the first and second single crystalline semiconductor substrates. The crystallographic orientations of the first single crystalline semiconductor substrate are selected to minimize stress deformation of the memory chip, while the crystallographic orientations of the second single crystalline semiconductor substrate are selected to maximize device performance of the peripheral circuitry.
    Type: Grant
    Filed: January 8, 2019
    Date of Patent: May 26, 2020
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Naohiro Hosoda, Kazuma Shimamoto, Tetsuya Shirasu, Yuji Fukano, Akio Nishida
  • Patent number: 8991042
    Abstract: A method for fabricating a semiconductor device includes (a) depositing an insulating film on a semiconductor substrate; (b) forming a recess in the insulating film; (c) depositing a conductive film on the insulating film while filling the recess with the conductive film; and (d) polishing the conductive film. Step (d) includes a first polishing substep of using a first polisher pad conditioned with a first dresser and a second polishing substep of using a second polisher pad conditioned with a second dresser different from the first dresser.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: March 31, 2015
    Assignee: Fujitsu Semiconductor Limited
    Inventors: Manabu Sakamoto, Tetsuya Shirasu, Naoki Idani
  • Publication number: 20130012019
    Abstract: A method for fabricating a semiconductor device includes (a) depositing an insulating film on a semiconductor substrate; (b) forming a recess in the insulating film; (c) depositing a conductive film on the insulating film while filling the recess with the conductive film; and (d) polishing the conductive film. Step (d) includes a first polishing substep of using a first polisher pad conditioned with a first dresser and a second polishing substep of using a second polisher pad conditioned with a second dresser different from the first dresser.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 10, 2013
    Applicant: FUJITSU SEMICONDUCTOR LIMITED
    Inventors: Manabu SAKAMOTO, Tetsuya SHIRASU, Naoki IDANI
  • Publication number: 20120196512
    Abstract: A polishing pad includes a first pad portion and a second pad portion disposed therearound, and each of the first and second pad portions is replaced individually. A CMP apparatus with the polishing pad (first and second pad portions) attached thereto conducts polishing of a semiconductor wafer. The second pad portion is replaced with a replacement second pad portion when the total polishing time reaches a predetermined period of time.
    Type: Application
    Filed: November 21, 2011
    Publication date: August 2, 2012
    Applicant: FUJITSU SEMICONDUCTOR LIMITED
    Inventor: Tetsuya SHIRASU
  • Patent number: 7842614
    Abstract: A method for manufacturing a semiconductor device, including depositing an interconnect material including Cu or Cu alloy over an insulating film, and polishing the interconnect material by CMP with a polishing liquid, wherein the oxidation-reduction potential (ORP) of the polishing liquid is controlled so as to be in the range of 400 mV to 700 mV vs. Ag/AgCl.
    Type: Grant
    Filed: January 3, 2008
    Date of Patent: November 30, 2010
    Assignee: Fujitsu Limited
    Inventors: Tsuyoshi Kanki, Takahiro Kimura, Tetsuya Shirasu
  • Publication number: 20100035523
    Abstract: A method for fabricating a semiconductor device includes: supporting a semiconductor substrate formed with a polishing target film by a polishing head; and polishing the polishing target film while restricting movement in a radial direction of the semiconductor substrate by a retainer formed on the polishing head with a tilted surface formed on an inner peripheral section of the retainer, wherein when the polishing target film is polished, an outer peripheral surface of the semiconductor substrate comes into contact with the tilted surface formed on the inner peripheral section of the retainer.
    Type: Application
    Filed: July 20, 2009
    Publication date: February 11, 2010
    Applicant: FUJITSU MICROELECTRONICS LIMITED
    Inventors: Tetsuya Shirasu, Toshiyuki Karasawa, Kenji Nakano
  • Publication number: 20090264054
    Abstract: A pedestal pad (workpiece supporting table pad) is arranged on the top of a pedestal (workpiece supporting table) for temporarily placing and holding a pre-polished or post-polished wafer (workpiece). This pedestal pad is formed of resin, and at least a surface of the pedestal pad which comes into contact with the wafer is non-absorbable to a fluid. The tissue of the pedestal pad is dense and smooth, and does not have any cavity, such as fine holes, which holds the fluid.
    Type: Application
    Filed: July 1, 2009
    Publication date: October 22, 2009
    Applicant: FUJITSU MICROELECTRONICS LIMITED
    Inventors: Tetsuya SHIRASU, Katsuhiko AOYAMA, Fumihiko AKABOSHI, Kunichirou GOTOH
  • Patent number: 7597606
    Abstract: A method of fabricating a semiconductor device includes a polishing process of a substrate, wherein the polishing process includes the steps of applying a chemical mechanical polishing process to the substrate on a polishing pad while using slurry, and conditions a surface of the polishing pad, the conditioning step including the step of grinding the surface of said polishing pad by at least first and second conditioning disks of respective, different surface states.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: October 6, 2009
    Assignee: Fujitsu Microelectronics Limited
    Inventor: Tetsuya Shirasu
  • Publication number: 20090056102
    Abstract: A method for fabricating a semiconductor device includes (a) depositing an insulating film on a semiconductor substrate; (b) forming a recess in the insulating film; (c) depositing a conductive film on the insulating film while filling the recess with the conductive film; and (d) polishing the conductive film. Step (d) includes a first polishing substep of using a first polisher pad conditioned with a first dresser and a second polishing substep of using a second polisher pad conditioned with a second dresser different from the first dresser.
    Type: Application
    Filed: August 28, 2008
    Publication date: March 5, 2009
    Applicant: FUJITSU MICROELECTRONICS LIMITED
    Inventors: Manabu SAKAMOTO, Tetsuya SHIRASU, Naoki IDANI
  • Publication number: 20080166877
    Abstract: A method for manufacturing a semiconductor device, including depositing an interconnect material including Cu or Cu alloy over an insulating film, and polishing the interconnect material by CMP with a polishing liquid, wherein the oxidation-reduction potential (ORP) of the polishing liquid is controlled so as to be in the range of 400 mV to 700 mV vs. Ag/AgCl.
    Type: Application
    Filed: January 3, 2008
    Publication date: July 10, 2008
    Applicant: FUJITSU LIMITED
    Inventors: Tsuyoshi Kanki, Takahiro Kimura, Tetsuya Shirasu
  • Publication number: 20080146128
    Abstract: A method of fabricating a semiconductor device includes a polishing process of a substrate, wherein the polishing process includes the steps of applying a chemical mechanical polishing process to the substrate on a polishing pad while using slurry, and conditions a surface of the polishing pad, the conditioning step including the step of grinding the surface of said polishing pad by at least first and second conditioning disks of respective, different surface states.
    Type: Application
    Filed: January 18, 2008
    Publication date: June 19, 2008
    Applicant: Fujitsu Limited
    Inventor: Tetsuya Shirasu
  • Publication number: 20080119050
    Abstract: An electric conductive film is formed on the insulating surface of a substrate, the substrate having a trench formed on the insulating surface, and the conductive film being filled in the trench. Chemical mechanical polishing is executed to expose the insulating surface of the substrate and leave a portion of the conductive film in the trench. The surface of the substrate having the exposed conductive film in the trench and the exposed insulating surface is exposed to first liquid. After being exposed to the first liquid, the surface of the substrate is exposed to second liquid. The first liquid is either solution which contains at least one first substance selected from a first group consisting of benzotriazole, derivative of benzotriazole and interfacial active agent, or water. The second solution is solution which contains the first substance at a density higher than a density of the first liquid.
    Type: Application
    Filed: January 9, 2008
    Publication date: May 22, 2008
    Applicant: FUJITSU LIMITED
    Inventors: Tetsuya Shirasu, Toshiyuki Karasawa, Nobuhiro Misawa, Tamotsu Yamamoto, Kenji Nakano
  • Patent number: 7348276
    Abstract: A method of fabricating a semiconductor device includes a polishing process of a substrate, wherein the polishing process includes the steps of applying a chemical mechanical polishing process to the substrate on a polishing pad while using slurry, and conditions a surface of the polishing pad, the conditioning step including the step of grinding the surface of said polishing pad by at least first and second conditioning disks of respective, different surface states.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: March 25, 2008
    Assignee: Fujitsu, Limited
    Inventor: Tetsuya Shirasu
  • Patent number: 7338905
    Abstract: An electric conductive film is formed on the insulating surface of a substrate, the substrate having a trench formed on the insulating surface, and the conductive film being filled in the trench. Chemical mechanical polishing is executed to expose the insulating surface of the substrate and leave a portion of the conductive film in the trench. The surface of the substrate having the exposed conductive film in the trench and the exposed insulating surface is exposed to first liquid. After being exposed to the first liquid, the surface of the substrate is exposed to second liquid. The first liquid is either solution which contains at least one first substance selected from a first group consisting of benzotriazole, derivative of benzotriazole and interfacial active agent, or water. The second solution is solution which contains the first substance at a density higher than a density of the first liquid.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: March 4, 2008
    Assignee: Fujitsu Limited
    Inventors: Tetsuya Shirasu, Toshiyuki Karasawa, Nobuhiro Misawa, Tamotsu Yamamoto, Kenji Nakano
  • Patent number: 7258599
    Abstract: A pedestal pad (workpiece supporting table pad) is arranged on the top of a pedestal (workpiece supporting table) for temporarily placing and holding a pre-polished or post-polished wafer (workpiece). This pedestal pad is formed of resin, and at least a surface of the pedestal pad which comes into contact with the wafer is non-absorbable to a fluid. The tissue of the pedestal pad is dense and smooth, and does not have any cavity, such as fine holes, which holds the fluid.
    Type: Grant
    Filed: December 29, 2005
    Date of Patent: August 21, 2007
    Assignee: Fujitsu Limited
    Inventor: Tetsuya Shirasu
  • Publication number: 20070123047
    Abstract: A pedestal pad (workpiece supporting table pad) is arranged on the top of a pedestal (workpiece supporting table) for temporarily placing and holding a pre-polished or post-polished wafer (workpiece). This pedestal pad is formed of resin, and at least a surface of the pedestal pad which comes into contact with the wafer is non-absorbable to a fluid. The tissue of the pedestal pad is dense and smooth, and does not have any cavity, such as fine holes, which holds the fluid.
    Type: Application
    Filed: January 11, 2007
    Publication date: May 31, 2007
    Inventors: Tetsuya Shirasu, Katsuhiko Aoyama, Fumihiko Akaboshi, Kunichirou Gotoh
  • Publication number: 20070060024
    Abstract: A pedestal pad (workpiece supporting table pad) is arranged on the top of a pedestal (workpiece supporting table) for temporarily placing and holding a pre-polished or post-polished wafer (workpiece). This pedestal pad is formed of resin, and at least a surface of the pedestal pad which comes into contact with the wafer is non-absorbable to a fluid. The tissue of the pedestal pad is dense and smooth, and does not have any cavity, such as fine holes, which holds the fluid.
    Type: Application
    Filed: December 29, 2005
    Publication date: March 15, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Tetsuya Shirasu, Katsuhiko Aoyama, Fumihiko Akaboshi, Kunichirou Gotoh
  • Publication number: 20060219662
    Abstract: A method of fabricating a semiconductor device includes a polishing process of a substrate, wherein the polishing process includes the steps of applying a chemical mechanical polishing process to the substrate on a polishing pad while using slurry, and conditions a surface of the polishing pad, the conditioning step including the step of grinding the surface of said polishing pad by at least first and second conditioning disks of respective, different surface states.
    Type: Application
    Filed: July 22, 2005
    Publication date: October 5, 2006
    Applicant: FUJITSU LIMITED
    Inventor: Tetsuya Shirasu