Patents by Inventor Masaaki Higashitani

Masaaki Higashitani 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: 11646282
    Abstract: A bonded assembly includes a first semiconductor die and a second semiconductor die. The first semiconductor die includes first metallic bonding pads embedded in first dielectric material layers, the second semiconductor die includes second metallic bonding pads embedded in second dielectric material layers, the first metallic bonding pads are bonded to a respective one of the second metallic bonding pads; and each of the first metallic bonding pads includes a corrosion barrier layer containing an alloy of a primary bonding metal and at least one corrosion-suppressing element that is different from the primary bonding metal.
    Type: Grant
    Filed: February 4, 2021
    Date of Patent: May 9, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Lin Hou, Peter Rabkin, Masaaki Higashitani
  • Publication number: 20230081623
    Abstract: For a non-volatile memory that uses hard bit and soft bit data in error correction operations, to reduce the amount of soft bit data that needs to be transferred from a memory to the controller and improve memory system performance, the soft bit data can be compressed before transfer. After the soft bit data is read and stored into the internal data latches associated with the sense amplifiers, it is compressed within these internal data latches. The compressed soft bit data can then be transferred to the transfer data latches of a cache buffer, where the compressed soft bit data can be consolidated and transferred out over an input-output interface. Within the input-output interface, the compressed data can be reshuffled to put into logical user data order if needed.
    Type: Application
    Filed: February 8, 2022
    Publication date: March 16, 2023
    Applicant: SANDISK TECHNOLOGIES LLC
    Inventors: Hua-Ling Cynthia Hsu, Masaaki Higashitani, YenLung Li, Chen Chen
  • Patent number: 11598005
    Abstract: A deposition chamber includes a vacuum enclosure, an electrostatic chuck having a flat top surface located within a vacuum enclosure, a lift-and-rotation unit extending through or laterally surrounding the electrostatic chuck at a position that is laterally offset from a vertical axis passing through a geometrical center of the electrostatic chuck, a gas supply manifold configured to provide influx of gas into the vacuum enclosure, and a pumping port connected to the vacuum enclosure.
    Type: Grant
    Filed: May 7, 2020
    Date of Patent: March 7, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Shoichi Murakami, Shigeru Nakatsuka, Syo Fukata, Yusuke Osawa, Shigehiro Fujino, Masaaki Higashitani
  • Publication number: 20230054342
    Abstract: To provide more test data during the manufacture of non-volatile memories and other integrated circuits, machine learning is used to generate virtual test values. Virtual test results are interpolated for one set of tests for devices on which the test is not performed based on correlations with other sets of tests. In one example, machine learning determines a correlation study between bad block values determined at die sort and photo-limited yield (PLY) values determined inline during processing. The correlation can be applied to interpolate virtual inline PLY data for all of the memory dies, allowing for more rapid feedback on the processing parameters for manufacturing the memory dies and making the manufacturing process more efficient and accurate. In another set of embodiments, the machine learning is used to extrapolate limited metrology (e.g., critical dimension) test data to all of the memory die through interpolated virtual metrology data values.
    Type: Application
    Filed: November 2, 2022
    Publication date: February 23, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Tsuyoshi Sendoda, Yusuke Ikawa, Nagarjuna Asam, Kei Samura, Masaaki Higashitani
  • Publication number: 20230044232
    Abstract: A memory die includes an alternating stack of insulating layers and electrically conductive layers through which memory opening fill structures vertically extend. The memory die includes at least three memory array regions interlaced with at least two contact regions, or at least three contact regions interlaced with at least two memory array regions in the same memory plane. A logic die including at least two word line driver regions can be bonded to the memory die. The interlacing of the contact regions and the memory array regions can reduce lateral offset of boundaries of the word line driver regions from boundaries of the contact regions.
    Type: Application
    Filed: December 20, 2021
    Publication date: February 9, 2023
    Inventors: James KAI, Yuki MIZUTANI, Hisakazu OTOI, Masaaki HIGASHITANI, Hiroyuki OAGAWA
  • Publication number: 20230042438
    Abstract: A bonded assembly includes a first semiconductor die and a second semiconductor die that are bonded to each other by dielectric-to-dielectric bonding. First conductive via structures vertically extend through the second semiconductor die and a respective subset of the first dielectric material layers in the first semiconductor die, and contact a respective first metal interconnect structure in the first semiconductor die. Second conductive via structures vertically extend through a second substrate and a respective subset of the second dielectric material layers in the second semiconductor die, and contacting a respective second metal interconnect structure in the second semiconductor die. Redistribution metal interconnect structures located over a backside surface of the second substrate electrically connect the first conductive via structures and the second conductive via structures, and provide electrical interconnection between the first semiconductor die and the second semiconductor die.
    Type: Application
    Filed: August 6, 2021
    Publication date: February 9, 2023
    Inventors: Lin Hou, Peter Rabkin, Yangyin Chen, Masaaki Higashitani
  • Patent number: 11569259
    Abstract: A memory die can include an alternating stack of insulating layers and electrically conductive layers located over a substrate, and memory stack structures vertically extending through the alternating stack. A first layer stack within the alternating stack includes a first staircase region in which the first electrically conductive layers have respective lateral extents that increase with a vertical distance from the substrate to provide first stepped surfaces. A second layer stack within the alternating stack includes a second staircase region in which the second electrically conductive layers have respective lateral extents that decrease with the vertical distance from the substrate to provide second stepped surfaces. The second layer stack can be more distal from the substrate than the first layer stack. Contact via structures can be formed from the top side and the bottom side of the alternating stack.
    Type: Grant
    Filed: August 5, 2020
    Date of Patent: January 31, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Yuki Mizutani, Masaaki Higashitani
  • Patent number: 11562975
    Abstract: A bonded assembly of a first semiconductor die and a second semiconductor die includes first and second semiconductor dies. The first semiconductor die includes first semiconductor devices, first metal interconnect structures embedded in first dielectric material layers, and first metal bonding pads laterally surrounded by a semiconductor material layer. The second semiconductor die includes second semiconductor devices, second metal interconnect structures embedded in second dielectric material layers, and second metal bonding pads that include primary metal bonding pads and auxiliary metal bonding pads. The auxiliary metal bonding pads are bonded to the semiconductor material layer through metal-semiconductor compound portions formed by reaction of surface portions of the semiconductor material layer and an auxiliary metal bonding pad. The primary metal bonding pads are bonded to the first metal bonding pads by metal-to-metal bonding.
    Type: Grant
    Filed: April 29, 2021
    Date of Patent: January 24, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Lin Hou, Peter Rabkin, Masaaki Higashitani
  • Publication number: 20230008286
    Abstract: A bonded assembly includes a first semiconductor die containing a first substrate, first semiconductor devices, and first bonding pads laterally surrounded by a first pad-level dielectric layer. The first pad-level dielectric layer includes at least one first encapsulated airgap located between neighboring pairs of first bonding pads and encapsulated by a first dielectric fill material of the first pad-level dielectric layer. The bonded assembly includes a second semiconductor die containing a second substrate, second semiconductor devices, and second bonding pads laterally surrounded by a second pad-level dielectric layer. Each of the second bonding pads is bonded to a respective one of the first bonding pads.
    Type: Application
    Filed: July 8, 2021
    Publication date: January 12, 2023
    Inventors: Lin HOU, Peter RABKIN, Adarsh RAJASHEKHAR, Raghuveer S. MAKALA, Masaaki HIGASHITANI
  • Patent number: 11551961
    Abstract: An apparatus includes an electrostatic chuck and located within a vacuum enclosure. A plurality of conductive plates can be embedded in the electrostatic chuck, and a plurality of plate bias circuits can be configured to independently electrically bias a respective one of the plurality of conductive plates. Alternatively or additionally, a plurality of spot lamp zones including a respective set of spot lamps can be provided between a bottom portion of the vacuum enclosure and a backside surface of the electrostatic chuck. The plurality of conductive plates and/or the plurality of spot lamp zones can be employed to locally modify chucking force and to provide local temperature control.
    Type: Grant
    Filed: May 6, 2020
    Date of Patent: January 10, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Shoichi Murakami, Shigeru Nakatsuka, Syo Fukata, Yusuke Osawa, Shigehiro Fujino, Masaaki Higashitani
  • Patent number: 11552094
    Abstract: A three-dimensional memory device includes an alternating stack of insulating layers and electrically conductive layers located over a substrate, and an array of memory opening fill structures extending through the alternating stack, an array of drain-select-level assemblies overlying the alternating stack and having a same two-dimensional periodicity as the array of memory opening fill structures, a first strip electrode portion laterally surrounding a first set of multiple rows of drain-select-level assemblies within the array of drain-select-level assemblies, and a drain-select-level isolation strip including an isolation dielectric that contacts the first strip electrode portion and laterally spaced from the drain-select-level assemblies and extending between the first strip electrode portion and a second strip electrode portion.
    Type: Grant
    Filed: September 24, 2020
    Date of Patent: January 10, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: James Kai, Murshed Chowdhury, Masaaki Higashitani, Johann Alsmeier
  • Publication number: 20220413036
    Abstract: To provide more test data during the manufacture of non-volatile memories and other integrated circuits, machine learning is used to generate virtual test values. Virtual test results are interpolated for one set of tests for devices on which the test is not performed based on correlations with other sets of tests. In one example, machine learning determines a correlation study between bad block values determined at die sort and photo-limited yield (PLY) values determined inline during processing. The correlation can be applied to interpolate virtual inline PLY data for all of the memory dies, allowing for more rapid feedback on the processing parameters for manufacturing the memory dies and making the manufacturing process more efficient and accurate. In another set of embodiments, the machine learning is used to extrapolate limited metrology (e.g., critical dimension) test data to all of the memory die through interpolated virtual metrology data values.
    Type: Application
    Filed: June 28, 2021
    Publication date: December 29, 2022
    Applicant: SanDisk Technologies LLC
    Inventors: Yusuke Ikawa, Tsuyoshi Sendoda, Kei Samura, Masaaki Higashitani
  • Publication number: 20220415718
    Abstract: To provide more test data during the manufacture of non-volatile memories and other integrated circuits, machine learning is used to generate virtual test values. Virtual test results are interpolated for one set of tests for devices on which the test is not performed based on correlations with other sets of tests. In one example, machine learning determines a correlation study between bad block values determined at die sort and photo-limited yield (PLY) values determined inline during processing. The correlation can be applied to interpolate virtual inline PLY data for all of the memory dies, allowing for more rapid feedback on the processing parameters for manufacturing the memory dies and making the manufacturing process more efficient and accurate. In another set of embodiments, the machine learning is used to extrapolate limited metrology (e.g., critical dimension) test data to all of the memory die through interpolated virtual metrology data values.
    Type: Application
    Filed: April 21, 2022
    Publication date: December 29, 2022
    Applicant: SanDisk Technologies LLC
    Inventors: Cheng-Chung Chu, Masaaki Higashitani, Yusuke Ikawa, Seyyed Ehsan Esfahani Rashidi, Kei Samura, Tsuyoshi Sendoda, Yanli Zhang
  • Patent number: 11538708
    Abstract: An apparatus includes an electrostatic chuck and located within a vacuum enclosure. A plurality of conductive plates can be embedded in the electrostatic chuck, and a plurality of plate bias circuits can be configured to independently electrically bias a respective one of the plurality of conductive plates. Alternatively or additionally, a plurality of spot lamp zones including a respective set of spot lamps can be provided between a bottom portion of the vacuum enclosure and a backside surface of the electrostatic chuck. The plurality of conductive plates and/or the plurality of spot lamp zones can be employed to locally modify chucking force and to provide local temperature control.
    Type: Grant
    Filed: May 6, 2020
    Date of Patent: December 27, 2022
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Shoichi Murakami, Shigeru Nakatsuka, Syo Fukata, Yusuke Osawa, Shigehiro Fujino, Masaaki Higashitani
  • Publication number: 20220399362
    Abstract: A bonded assembly includes a memory die that is bonded to a logic die. The memory die includes a three-dimensional memory array located on a memory-side substrate, memory-side dielectric material layers located on the three-dimensional memory array and embedding memory-side metal interconnect structures and memory-side bonding pads, a backside peripheral circuit located on a backside surface of the memory-side substrate, and backside dielectric material layers located on a backside of the memory-side substrate and embedding backside metal interconnect structures. The logic die includes a logic-side peripheral circuit located on a logic-side substrate, and logic-side dielectric material layers located between the logic-side substrate and the memory die and embedding logic-side metal interconnect structures and logic-side bonding pads that are bonded to a respective one of the memory-side bonding pads.
    Type: Application
    Filed: June 15, 2021
    Publication date: December 15, 2022
    Inventors: Yuki MIZUTANI, Fumiaki TOYAMA, Masaaki HIGASHITANI
  • Publication number: 20220399358
    Abstract: A bonded assembly includes a backside peripheral circuit, a memory die and a first logic die. The memory die includes a doped semiconductor material layer, a three-dimensional memory array, and memory-side metal interconnect structures and first memory-side bonding pads embedded in memory-side dielectric material layers. The first logic die includes a logic-side peripheral circuit including a first subset of logic devices configured to control operation of the three-dimensional memory array, logic-side dielectric material layers, and logic-side metal interconnect structures and first logic-side bonding pads that are bonded to a respective one of the first memory-side bonding pads. The backside peripheral circuit includes a second subset of the logic devices located on a second side of the doped semiconductor material layer.
    Type: Application
    Filed: October 11, 2021
    Publication date: December 15, 2022
    Inventors: Yuki MIZUTANI, Fumiaki TOYAMA, Masaaki HIGASHITANI
  • Patent number: 11508654
    Abstract: A non-volatile storage apparatus comprises a non-volatile memory structure and a plurality of I/O pads in communication with the non-volatile memory structure. The I/O pads include a power I/O pad, a ground I/O pad and data/control I/O pads. The non-volatile storage apparatus further comprises one or more capacitors connected to the power I/O pad and the ground I/O pad. The one or more capacitors are positioned in one or more metal interconnect layers below the signal lines and/or above device capacitors on the top surface of the substrate.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: November 22, 2022
    Assignee: SanDisk Technologies LLC
    Inventors: Luisa Lin, Mohan Dunga, Venkatesh P. Ramachandra, Peter Rabkin, Masaaki Higashitani
  • Publication number: 20220367499
    Abstract: A three-dimensional memory device includes an alternating stack of insulating layers and electrically conductive layers located over a substrate, an array of memory opening fill structures located within an array of memory openings vertically extending through the alternating stack, and a drain-select-level isolation structure vertically extending through drain-select-level electrically conductive layers between two rows of memory opening fill structures. The drain-select-level isolation structure may comprise a low-k dielectric material or an air gap.
    Type: Application
    Filed: May 11, 2021
    Publication date: November 17, 2022
    Inventors: Koichi MATSUNO, Masaaki HIGASHITANI, Johann ALSMEIER
  • Publication number: 20220367487
    Abstract: A three-dimensional memory device includes an alternating stack of insulating layers and electrically conductive layers located over a substrate, an array of memory opening fill structures located within an array of memory openings vertically extending through the alternating stack, and a drain-select-level isolation structure vertically extending through drain-select-level electrically conductive layers between two rows of memory opening fill structures. The drain-select-level isolation structure may comprise a low-k dielectric material or an air gap.
    Type: Application
    Filed: May 11, 2021
    Publication date: November 17, 2022
    Inventors: Peng ZHANG, Yanli ZHANG, Xiang YANG, Koichi MATSUNO, Masaaki HIGASHITANI, Johann ALSMEIER
  • Publication number: 20220352104
    Abstract: A bonded assembly of a first semiconductor die and a second semiconductor die includes first and second semiconductor dies. The first semiconductor die includes first semiconductor devices, first metal interconnect structures embedded in first dielectric material layers, and first metal bonding pads laterally surrounded by a semiconductor material layer. The second semiconductor die includes second semiconductor devices, second metal interconnect structures embedded in second dielectric material layers, and second metal bonding pads that include primary metal bonding pads and auxiliary metal bonding pads. The auxiliary metal bonding pads are bonded to the semiconductor material layer through metal-semiconductor compound portions formed by reaction of surface portions of the semiconductor material layer and an auxiliary metal bonding pad. The primary metal bonding pads are bonded to the first metal bonding pads by metal-to-metal bonding.
    Type: Application
    Filed: April 29, 2021
    Publication date: November 3, 2022
    Inventors: Lin HOU, Peter RABKIN, Masaaki HIGASHITANI