Patents by Inventor Takashi Ando

Takashi Ando 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: 11665983
    Abstract: A structure including a bottom electrode, a phase change material layer vertically aligned and an ovonic threshold switching layer vertically aligned above the phase change material layer. A structure including a bottom electrode, a phase change material layer and an ovonic threshold switching layer vertically aligned above the phase change material layer, and a first barrier layer physically separating the ovonic threshold switching layer from a top electrode. A method including forming a structure including a liner vertically aligned above a first barrier layer, the first barrier layer vertically aligned above a phase change material layer, the phase change material layer vertically aligned above a bottom electrode, forming a dielectric surrounding the structure, and forming an ovonic threshold switching layer on the first barrier layer, vertical side surfaces of the first buffer layer are vertically aligned with the first buffer layer, the phase change material layer and the bottom electrode.
    Type: Grant
    Filed: December 11, 2020
    Date of Patent: May 30, 2023
    Assignee: International Business Machines Corporation
    Inventors: Nanbo Gong, Takashi Ando, Robert L. Bruce, Alexander Reznicek, Bahman Hekmatshoartabari
  • Publication number: 20230153444
    Abstract: In an approach to a implementing a PUF based on a PCM array, for each PCM device in an array of PCM devices, the PCM device is reset to an initial state. A first conductance of the PCM device is measured. A predetermined number of partial set pulses is applied to the PCM device. A second conductance of the PCM device is measured. Responsive to determining that the second conductance is greater than the first conductance multiplied by a factor, a PUF value of the PCM device is set to logical “1”. Responsive to determining that the second conductance is less than the first conductance multiplied by a factor, a PUF value of the PCM device is set to logical “0”. The PUF value of the PCM device is added to an overall PUF string for the array of PCM devices.
    Type: Application
    Filed: November 15, 2021
    Publication date: May 18, 2023
    Inventors: Guy M. Cohen, Nanbo Gong, Takashi Ando
  • Publication number: 20230154798
    Abstract: A method is presented for attaining different gate threshold voltages across a plurality of field effect transistor (FET) devices without patterning between nanosheet channels. The method includes forming a first set of nanosheet stacks having a first intersheet spacing, forming a second set of nanosheet stacks having a second intersheet spacing, where the first intersheet spacing is greater than the second intersheet spacing, depositing a high-k (HK) layer within the first and second nanosheet stacks, depositing a material stack that, when annealed, creates a crystallized HK layer in the first set of nanosheet stacks and an amorphous HK layer in the second nanosheet stacks, depositing a dipole material, and selectively diffusing the dipole material into the amorphous HK layer of the second set of nanosheet stacks to provide the different gate threshold voltages for the plurality of FET devices.
    Type: Application
    Filed: November 16, 2021
    Publication date: May 18, 2023
    Inventors: Jingyun Zhang, Takashi Ando, ChoongHyun Lee, Alexander Reznicek
  • Patent number: 11653578
    Abstract: An apparatus comprises a phase-change material, a first electrode at a first end of the phase-change material, a second electrode at a second end of the phase-change material, and a heating element coupled to a least a given portion of the phase-change material between the first end and the second end. The apparatus also comprises a first input terminal coupled to the heating element, a second input terminal coupled to the heating element, and an output terminal coupled to the second electrode.
    Type: Grant
    Filed: December 1, 2020
    Date of Patent: May 16, 2023
    Assignee: International Business Machines Corporation
    Inventors: Nanbo Gong, Guy M. Cohen, Takashi Ando
  • Patent number: 11647684
    Abstract: In an approach for forming a nonvolatile tunable capacitor device, a first electrode layer is formed distally opposed from a second electrode layer, the first electrode layer configured to make a first electrical connection and the second electrode layer configured to make a second electrical connection. A dielectric layer is posited between the first electrode layer and adjacent to the second electrode layer. A phase change material (PCM) layer is posited between the first electrode layer and the second electrode layer adjacent to the dielectric layer. An energizing component is provided to heat the PCM layer to change a phase of the PCM layer. The energizing component may include a heating element or electrical probe in direct contact with the PCM layer, that when energized is configured to apply heat to the PCM layer. The phase of the PCM layer is changeable between an amorphous phase and a crystalline phase.
    Type: Grant
    Filed: March 30, 2021
    Date of Patent: May 9, 2023
    Assignee: International Business Machines Corporation
    Inventors: Guy M. Cohen, Takashi Ando, Nanbo Gong, Yulong Li
  • Patent number: 11647680
    Abstract: Provided are embodiments for a semiconductor device. The semiconductor device includes a bottom electrode, wherein the bottom electrode is formed on a metal interconnect electrode, and a dielectric layer on a surface of the bottom electrode. The semiconductor device also includes a top electrode formed on a surface of the dielectric layer, wherein at least one of the top electrode or the bottom electrode is a plasma treated top electrode or plasma treated bottom electrode. Also provided are embodiments for a method of fabricating a resistive switching device where at least one of the plurality of layers of the memory stack is processed with a charge particle treatment.
    Type: Grant
    Filed: June 11, 2020
    Date of Patent: May 9, 2023
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Hiroyuki Miyazoe, Eduard Albert Cartier, Babar Khan, Youngseok Kim, Dexin Kong, Soon-Cheon Seo, Joel P. De Souza
  • Patent number: 11647639
    Abstract: A method for manufacturing a semiconductor memory device includes depositing a bottom metal line layer on a dielectric layer, and patterning the bottom metal line layer into a plurality of bottom metal lines spaced apart from each other. In the method, a plurality of switching element dielectric portions are formed on respective ones of the plurality of bottom metal lines, and a top metal line layer is deposited on the plurality of switching element dielectric portions. The method further includes patterning the top metal line layer into a plurality of top metal lines spaced apart from each other. The plurality of top metal lines are oriented perpendicular to the plurality of bottom metal lines.
    Type: Grant
    Filed: February 9, 2022
    Date of Patent: May 9, 2023
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Hiroyuki Miyazoe
  • Patent number: 11646362
    Abstract: A method for manufacturing a semiconductor device includes forming a plurality of fins on a substrate. The plurality of fins each include a first portion having a first width, and a second portion having a second width greater than the first width. The method also includes forming a sacrificial layer on the substrate in a space between a first fin and a second fin of the plurality of fins, wherein the first fin and the second fin correspond to a vertical transistor. In the method, lower portions of the first and second fins are removed, and an epitaxial region is formed under remaining portions of the first and second fins. The sacrificial layer is removed from the space between the first fin and the second fin after forming the epitaxial region.
    Type: Grant
    Filed: August 27, 2021
    Date of Patent: May 9, 2023
    Assignee: International Business Machines Corporation
    Inventors: Ruilong Xie, Alexander Reznicek, Takashi Ando, Pouya Hashemi
  • Publication number: 20230128314
    Abstract: The embodiments herein describe a vertical field effect transistor (FET) with a gate that includes different work function metals (WFMs). Each WFM can be made up of one material (or one layer) or multiple materials forming multiple layers. In any case, the gate includes at least two different WFMs. For example, a first WFM may have a different material or layer than a second WFM in the gate, or one layer of the first WFM may have a different thickness than a corresponding layer in the second WFM. Having different WFMs in the gate can reduce the gate induced drain leakage (GIDL) in the FET.
    Type: Application
    Filed: October 26, 2021
    Publication date: April 27, 2023
    Inventors: Takashi ANDO, Ruilong XIE, Pouya HASHEMI, Alexander REZNICEK
  • Publication number: 20230124673
    Abstract: Embodiments are for vertical field effect transistors having different threshold voltages along the channel. A vertical fin having a vertical channel is formed, one end of the vertical channel including a doped layer, the doped layer causing a threshold voltage at the one end to be different from a remainder of the vertical channel. A source and a drain are formed each coupled to opposite ends of the vertical fin, gate material being formed on the vertical channel.
    Type: Application
    Filed: October 20, 2021
    Publication date: April 20, 2023
    Inventors: Choonghyun Lee, Takashi Ando, Alexander Reznicek, Jingyun Zhang
  • Patent number: 11631809
    Abstract: In a method for using or forming a semiconductor structure. The semiconductor structure may include a resistive random access memory (RRAM) gate with a first electrode and a second electrode. The RRAM gate may also include a switching layer that includes a dielectric material having a switching layer k-value and a switching layer thermal conductivity. The RRAM gate may also include a complimentary switching (CS) mitigation layer with a material having a CS k-value that is lower than the switching layer k-value and a CS thermal conductivity that is higher than the switching layer thermal conductivity.
    Type: Grant
    Filed: December 15, 2020
    Date of Patent: April 18, 2023
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Nanbo Gong, Guy M. Cohen
  • Patent number: 11631462
    Abstract: A method is presented for temperature assisted programming of flash memory for neuromorphic computing. The method includes training a chip in an environment having a first temperature, adjusting the first temperature to a second temperature in the environment, and employing the chip for inference in the second temperature environment. The first temperature is about 125° C. or higher and the second temperature is about 50° C. or lower.
    Type: Grant
    Filed: February 10, 2020
    Date of Patent: April 18, 2023
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Nanbo Gong, Takashi Ando, Bahman Hekmatshoartabari, Alexander Reznicek
  • Publication number: 20230108998
    Abstract: A physical unclonable function device includes alternating regions of programable material and electrically conductive regions. The regions of programable material are configured to switch resistance upon receiving an electric pulse. An electric pulse applied between two outer electrically conductive regions of the alternating regions will switch the resistance of at least one region of programmable material. The alternating regions may include a plurality of the electrically conducting regions and a region of the programable material disposed between each of the plurality of electrically conductive regions. The resistance of each of the regions of programable material is selectively variable in at least a portion thereof as a result of the electric pulse flowing therethrough. The resistance value of the programable material region may be a readable value as a state of the device. The regions of programmable material may be formed of a phase change material or an oxide.
    Type: Application
    Filed: October 4, 2021
    Publication date: April 6, 2023
    Inventors: Guy M. Cohen, Takashi Ando, Nanbo Gong, Franco Stellari
  • Publication number: 20230109660
    Abstract: Embodiments of the invention are directed to a structure that includes a resistive switching device (RSD). The RSD includes a first terminal having an outer sidewall surface; a second terminal; an active region having a switchable conduction state; and a first protective layer on the outer sidewall surface of the first terminal.
    Type: Application
    Filed: September 24, 2021
    Publication date: April 6, 2023
    Inventors: Takashi Ando, Ruilong Xie, Alexander Reznicek, Pouya Hashemi
  • Publication number: 20230097847
    Abstract: A porous thin film includes a framework that includes a plurality of pores. The pores extend from an opening located at an upper surface of the framework to a bottom surface contained in the framework. A pore-coating film is formed on sidewalls and the bottom surface of the pores.
    Type: Application
    Filed: September 27, 2021
    Publication date: March 30, 2023
    Inventors: Leonidas Ernesto Ocola, Eric A. Joseph, Hiroyuki Miyazoe, Takashi Ando, Damon Brooks Farmer
  • Publication number: 20230094719
    Abstract: A memory device is provided. The memory device includes a main feature disposed beneath a surface of a photolithographic mask. The memory device further includes at least one Sub-Resolution Assistant Feature (SRAF) proximate to the main feature beneath the surface. The main feature has an electrical conductivity based on an area relationship with the at least one SRAF.
    Type: Application
    Filed: September 30, 2021
    Publication date: March 30, 2023
    Inventors: Cheng Chi, Takashi Ando, Reinaldo Vega, Praneet Adusumilli
  • Publication number: 20230097904
    Abstract: A method of manufacturing a low program voltage flash memory cell with an embedded heater in the control gate creates, on a common device substrate, a conventional flash memory cell in a conventional flash memory area (CFMA), and a neuromorphic computing memory cell in a neuromorphic computing memory area (NCMA). The method comprises providing a flash memory stack in both the CFMA and the NCMA, depositing a heater on top of the flash memory stack in the NCMA without depositing a heater on top of the flash memory stack in the CFMA.
    Type: Application
    Filed: September 29, 2021
    Publication date: March 30, 2023
    Inventors: Takashi Ando, Nanbo Gong, Bahman Hekmatshoartabari, Alexander Reznicek
  • Publication number: 20230103003
    Abstract: An apparatus includes a first plate, a second plate, a third plate, a ferroelectric dielectric, and a paraelectric dielectric. The ferroelectric dielectric is between the first plate and the second plate such that the first plate, the ferroelectric dielectric, and the second plate form a first capacitor. The paraelectric dielectric is between the second plate and the third plate such that the second plate, the paraelectric dielectric, and the third plate form a second capacitor.
    Type: Application
    Filed: September 24, 2021
    Publication date: March 30, 2023
    Inventors: Takashi ANDO, Reinaldo VEGA, Cheng CHI, Praneet ADUSUMILLI
  • Publication number: 20230099254
    Abstract: Embodiments of the invention are directed to a transistor device that includes a channel stack having stacked, spaced-apart, channel layers. A first source or drain (S/D) region is communicatively coupled to the channel stack. A tunnel extends through the channel stack, wherein the tunnel includes a central region and a first set of end regions. The first set of end regions is positioned closer to the first S/D region than the central region is to the first S/D region. A first type of work-function metal (WFM) is formed in the first set of end regions, the first WFM having a first work-function (WF). A second type of WFM is formed in the central region, the second type of WFM having a second WF, wherein the first WF is different than the second WF.
    Type: Application
    Filed: September 24, 2021
    Publication date: March 30, 2023
    Inventors: Takashi Ando, Ruilong Xie, Pouya Hashemi, Alexander Reznicek
  • Publication number: 20230085995
    Abstract: A semiconductor device comprises a plurality of resistive memory element structures, at least a subset of the plurality of resistive memory element structures being associated with random analog resistive states. The random analog resistive states of the subset of the plurality of resistive memory element structures provide a unique identification of the semiconductor device.
    Type: Application
    Filed: September 22, 2021
    Publication date: March 23, 2023
    Inventors: Takashi Ando, Jonas Doevenspeck, Youngseok Kim, Soon-Cheon Seo, Seyoung Kim