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).

  • Publication number: 20240127864
    Abstract: A memory device includes a first memory block containing first word lines and a first source layer segment, and a second memory block containing second word lines and a second source layer segment which is electrically isolated from the first source layer segment. The first word lines in the first memory block are electrically connected to the respective second word lines in the second memory block.
    Type: Application
    Filed: July 11, 2023
    Publication date: April 18, 2024
    Inventors: Masaaki HIGASHITANI, James KAI, Johann ALSMEIER
  • Patent number: 11963352
    Abstract: A semiconductor structure includes at least one set of vertical field effect transistors embedded within dielectric material layers overlying a substrate. Each vertical field effect transistor includes a bottom electrode, a metal oxide semiconductor vertical transistor channel, a cylindrical gate dielectric, and a top electrode. A three-dimensional NAND memory array can be provided over the first field effect transistors, and can be electrically connected to the vertical field effect transistors via metal interconnect structures. Alternatively, a three-dimensional NAND memory array can be formed on another substrate, which can be bonded to the substrate via metal-to-metal bonding. The vertical field effect transistors can be employed as switches for bit lines, word lines, or other components of the three-dimensional NAND memory array.
    Type: Grant
    Filed: June 29, 2021
    Date of Patent: April 16, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Peter Rabkin, Masaaki Higashitani
  • Patent number: 11948902
    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: Grant
    Filed: July 8, 2021
    Date of Patent: April 2, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Lin Hou, Peter Rabkin, Adarsh Rajashekhar, Raghuveer S. Makala, Masaaki Higashitani
  • Publication number: 20240105265
    Abstract: A non-volatile memory system comprises a plurality of non-volatile memory cells divided into three or more tiers. The memory cells can be programmed, erased and read. In order to achieve uniform erase speed for the three or more tiers, the erase process comprises applying a larger voltage bias to control gates of non-volatile memory cells in the outer tiers than the voltage bias applied to control gates of non-volatile memory cells in one or more inner tiers.
    Type: Application
    Filed: September 26, 2022
    Publication date: March 28, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Masaaki Higashitani, Abhijith Prakash, Dengtao Zhao
  • Publication number: 20240096850
    Abstract: An integrated controller, logic circuit and memory array (“CLM”) semiconductor device includes stacked controller, memory array logic circuit and memory array wafers, or individual dies diced therefrom, which together operate as a single, integrated semiconductor flash memory device. The memory array logic circuit dies and/or the memory array dies may be formed with full-thickness plated or filled vias connecting to bond pads on opposed surfaces of the dies. The bond pads of the respective stacked semiconductor dies may be aligned and affixed to each other to electrically and mechanically couple each of the semiconductor dies in the respective wafers together.
    Type: Application
    Filed: September 20, 2022
    Publication date: March 21, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Jayavel Pachamuthu, Srinivasan Sivaram, Masaaki Higashitani
  • Patent number: 11901019
    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: Grant
    Filed: February 8, 2022
    Date of Patent: February 13, 2024
    Assignee: SanDisk Technologies LLC
    Inventors: Hua-Ling Cynthia Hsu, Masaaki Higashitani, YenLung Li, Chen Chen
  • Patent number: 11869877
    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: Grant
    Filed: August 6, 2021
    Date of Patent: January 9, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Lin Hou, Peter Rabkin, Yangyin Chen, Masaaki Higashitani
  • Patent number: 11871580
    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: Grant
    Filed: May 11, 2021
    Date of Patent: January 9, 2024
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Peng Zhang, Yanli Zhang, Xiang Yang, Koichi Matsuno, Masaaki Higashitani, Johann Alsmeier
  • Patent number: 11856765
    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: Grant
    Filed: May 11, 2021
    Date of Patent: December 26, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Koichi Matsuno, Masaaki Higashitani, Johann Alsmeier
  • Publication number: 20230367944
    Abstract: The memory device includes a die with a first set of planes and a second set of planes. The planes are rectangular in shape with a major dimension and a minor dimension. The die includes a CMOS layer with at least one common peripheral circuitry area, and each of the planes includes a non-common peripheral circuitry area in the CMOS layer. Each plane of the first set of planes is oriented such that its major dimension extends in a first direction, and each plane of the second set of planes is oriented such that its major dimension extends in a second direction that is different than the first direction such that the non-common peripheral circuitry area of each plane is immediately adjacent the at least one common peripheral circuitry area in the CMOS layer.
    Type: Application
    Filed: May 10, 2022
    Publication date: November 16, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Yuki Mizutani, Masaaki Higashitani
  • Publication number: 20230363158
    Abstract: A memory die includes an alternating stack of insulating layers and electrically conductive layers, a memory opening vertically extending through the alternating stack, and a memory opening fill structure located in the memory opening and including a memory film and a vertical composite metal oxide semiconductor channel having a different composition between its inner and outer portions.
    Type: Application
    Filed: May 3, 2022
    Publication date: November 9, 2023
    Inventors: Peter RABKIN, Masaaki HIGASHITANI
  • Publication number: 20230363161
    Abstract: A three-dimensional memory device includes an alternating stack of insulating layers and electrically conductive layers, a memory opening vertically extending through the alternating stack, and a memory opening fill structure located in the memory opening and including a memory film and a vertical composite metal oxide semiconductor channel that contains an outer semiconducting metal oxide channel layer having a first band gap and an inner semiconducting metal oxide channel layer having a second band gap that is different from the first band gap.
    Type: Application
    Filed: October 7, 2022
    Publication date: November 9, 2023
    Inventors: Peter RABKIN, Masaaki HIGASHITANI
  • Publication number: 20230363162
    Abstract: A three-dimensional memory device includes an alternating stack of insulating layers and electrically conductive layers, a memory opening vertically extending through the alternating stack, a memory film located in the memory opening, and a composite metal oxide semiconductor channel containing a first semiconducting metal oxide channel layer having a first band gap and a second semiconducting metal oxide channel layer having a second band gap that is different from the first band gap.
    Type: Application
    Filed: January 24, 2023
    Publication date: November 9, 2023
    Inventors: Peter RABKIN, Masaaki HIGASHITANI
  • Patent number: 11791327
    Abstract: A memory-containing die includes a three-dimensional memory array, a memory dielectric material layer located on a first side of the three-dimensional memory array, and memory-side bonding pads. A logic die includes a peripheral circuitry configured to control operation of the three-dimensional memory array, logic dielectric material layers located on a first side of the peripheral circuitry, and logic-side bonding pads included in the logic dielectric material layers. The logic-side bonding pads includes a pad-level mesh structure electrically connected to a source power supply circuit within the peripheral circuitry and containing an array of discrete openings therethrough, and discrete logic-side bonding pads. The logic-side bonding pads are bonded to a respective one, or a respective subset, of the memory-side bonding pads. The pad-level mesh structure can be used as a component of a source power distribution network.
    Type: Grant
    Filed: August 25, 2021
    Date of Patent: October 17, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Kwang-Ho Kim, Masaaki Higashitani, Fumiaki Toyama, Akio Nishida
  • Publication number: 20230253353
    Abstract: A bonded assembly of a primary semiconductor die and a complementary semiconductor die includes first pairs of first primary bonding pads and first complementary bonding pads that are larger in area than the first primary bonding pads, and second pairs of second primary bonding pads and second complementary bonding pads that are smaller in area than the second primary bonding pads.
    Type: Application
    Filed: February 8, 2022
    Publication date: August 10, 2023
    Inventors: Lin HOU, Peter RABKIN, Masaaki HIGASHITANI
  • Publication number: 20230223248
    Abstract: A method of depositing a metal includes providing a structure a process chamber, and providing a metal fluoride gas and a growth-suppressant gas into the process chamber to deposit the metal over the structure. The metal may comprise a word line or another conductor of a three-dimensional memory device.
    Type: Application
    Filed: January 11, 2022
    Publication date: July 13, 2023
    Inventors: Fei ZHOU, Rahul SHARANGPANI, Raghuveer S. MAKALA, Yujin TERASAWA, Naoki TAKEGUCHI, Kensuke YAMAGUCHI, Masaaki HIGASHITANI
  • Publication number: 20230223266
    Abstract: A method of depositing a metal includes providing a structure a process chamber, and providing a metal fluoride gas and a growth-suppressant gas into the process chamber to deposit the metal over the structure. The metal may comprise a word line or another conductor of a three-dimensional memory device.
    Type: Application
    Filed: January 11, 2022
    Publication date: July 13, 2023
    Inventors: Fei ZHOU, Rahul SHARANGPANI, Raghuveer S. MAKALA, Yujin TERASAWA, Naoki TAKEGUCHI, Kensuke YAMAGUCHI, Masaaki HIGASHITANI
  • Patent number: 11676954
    Abstract: A semiconductor structure includes a memory die bonded to a logic die. The memory die includes an alternating stack of insulating layers and electrically conductive layers; memory openings extending through the alternating stack, memory opening fill structures located in the memory openings and comprising a respective vertical semiconductor channel and a respective memory film, a source layer contacting the vertical semiconductor channels, a backside isolation dielectric layer contacting a backside surface of the source layer, and a source power supply mesh including a planar portion of a source-side electrically conductive layer that is located on a backside of the backside isolation dielectric layer and electrically connected to the source layer by conductive material portions that extend through the backside isolation dielectric layer.
    Type: Grant
    Filed: December 28, 2020
    Date of Patent: June 13, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Peter Rabkin, Masaaki Higashitani, Kwang-ho Kim
  • Publication number: 20230142936
    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: January 10, 2023
    Publication date: May 11, 2023
    Applicant: SanDisk Technologies LLC
    Inventors: Tsuyoshi Sendoda, Yusuke Ikawa, Nagarjuna Asam, Kei Samura, Masaaki Higashitani
  • Patent number: 11646283
    Abstract: A first metal layer can be deposited over first dielectric material layers of a first substrate, and can be patterned into first bonding pads. A first low-k material layer can be formed over the first bonding pads. The first low-k material layer includes a low-k dielectric material such as a MOF dielectric material or organosilicate glass. A second semiconductor die including second bonding pads can be provided. The first bonding pads are bonded to the second bonding pads to form a bonded assembly.
    Type: Grant
    Filed: June 24, 2021
    Date of Patent: May 9, 2023
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Lin Hou, Peter Rabkin, Masaaki Higashitani, Ramy Nashed Bassely Said