Patents by Inventor Durai Vishak Nirmal Ramaswamy

Durai Vishak Nirmal Ramaswamy 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: 11973145
    Abstract: A device comprises vertically oriented transistors. The device comprises a pillar comprising at least one oxide semiconductor material, the pillar wider in a first lateral direction at an upper portion thereof than at a lower portion thereof, a gate dielectric material over sidewalls of the pillar and extending in the first lateral direction, and at least one gate electrode adjacent to at least a portion of the gate dielectric material. Related devices, electronic systems, and methods are also disclosed.
    Type: Grant
    Filed: June 10, 2022
    Date of Patent: April 30, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Durai Vishak Nirmal Ramaswamy, Scott E. Sills
  • Publication number: 20240138158
    Abstract: Some embodiments include apparatuses and methods using a substrate, a pillar having a length perpendicular to the substrate, a first conductive plate, a second conductive plate, a memory cell located between the first and second conductive plates and electrically separated from the first and second conductive plates, and a conductive connection. The first conductive plate is located in a first level of the apparatus and being separated from the pillar by a first dielectric located in the first level. The second conductive plate is located in a second level of the apparatus and being separated from the pillar by a second dielectric located in the second level. The memory cell includes a first semiconductor material located in a third level of the apparatus between the first and second levels and contacting the pillar and the conductive connection, and a second semiconductor material located in a fourth level of the apparatus between the first and second levels and contacting the pillar.
    Type: Application
    Filed: December 29, 2023
    Publication date: April 25, 2024
    Inventors: Kamal M. Karda, Karthik Sarpatwari, Haitao Liu, Durai Vishak Nirmal Ramaswamy
  • Publication number: 20240127877
    Abstract: Methods, systems, and devices for differential storage in memory arrays are described. A memory device may include pairs of memory cells configured to store a single logic state (e.g., a single bit of information). Additionally, the memory device may include sense amplifiers configured to sense the logic state based on a difference between a voltage of a first ferroelectric memory cell of the pair of memory cells and a voltage of a second ferroelectric memory cell of the pair of memory cells. In one example, the memory device may include pairs of memory cells within a single memory array on a single level. Here, each memory cell pair may include a memory cells that are each coupled with a same word line and plate line. Additionally, each memory cell pair may include memory cells each coupled with different digit lines.
    Type: Application
    Filed: October 18, 2022
    Publication date: April 18, 2024
    Inventors: Durai Vishak Nirmal Ramaswamy, Giorgio Servalli, Angelo Visconti, Marcello Mariani, Alessandro Calderoni
  • Patent number: 11955156
    Abstract: Some embodiments include a ferroelectric transistor. The transistor has gate dielectric material configured as a first container, with the first container having a first inner surface. Metal-containing material is configured as a second container nested within said first container. The second container has a second inner surface with an area less than the first inner surface. Ferroelectric material is configured as a third container nested within the second container. The third container has a third inner surface with an area less than the second inner surface. Gate material is within the third container. Some embodiments include memory arrays having ferroelectric transistors as memory cells. Some embodiments include methods of writing/reading relative to memory cells of memory arrays when the memory cells are metal-ferroelectric-metal-insulator-semiconductor (MFMIS) transistors.
    Type: Grant
    Filed: January 31, 2022
    Date of Patent: April 9, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Durai Vishak Nirmal Ramaswamy, Wayne Kinney
  • Publication number: 20240113223
    Abstract: A transistor comprising threshold voltage control gates. The transistor also comprises active control gates adjacent opposing first sides of a channel region, the threshold voltage control gates adjacent opposing second sides of the channel region, and a dielectric region between the threshold voltage control gates and the channel region and between the active control gates and the channel region. A semiconductor device comprising memory cells comprising the transistor is also disclosed, as are systems comprising the memory cells, methods of forming the semiconductor device, and methods of operating a semiconductor device.
    Type: Application
    Filed: December 5, 2023
    Publication date: April 4, 2024
    Inventors: Kamal M. Karda, Kirk D. Prall, Haitao Liu, Durai Vishak Nirmal Ramaswamy
  • Patent number: 11950402
    Abstract: Some embodiments include apparatuses and methods of forming the apparatuses. One of the apparatuses includes a conductive region, a first data line, a second data line, a first memory cell coupled to the first data line and the conductive region, a second memory cell coupled to the second data line and the conductive region, a conductive structure, and a conductive line. The first memory cell includes a first transistor coupled to a second transistor, the first transistor including a first charge storage structure. The second memory cell includes a third transistor coupled to a fourth transistor, the third transistor including a second charge storage structure. The conductive structure is located between and electrically separated from the first and second charge storage structures. The conductive line forms a gate of each of the first, second, third, and fourth transistors.
    Type: Grant
    Filed: April 21, 2023
    Date of Patent: April 2, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Kamal M. Karda, Haitao Liu, Karthik Sarpatwari, Durai Vishak Nirmal Ramaswamy
  • Patent number: 11950426
    Abstract: Some embodiments include apparatuses and methods forming the apparatuses. One of the apparatuses includes a first transistor including a first channel region, and a charge storage structure separated from the first channel region; a second transistor including a second channel region formed over the charge storage structure; and a data line formed over and contacting the first channel region and the second channel region, the data line including a portion adjacent the first channel region and separated from the first channel region by a dielectric material.
    Type: Grant
    Filed: March 27, 2023
    Date of Patent: April 2, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Kamal M. Karda, Eric S. Carman, Karthik Sarpatwari, Durai Vishak Nirmal Ramaswamy, Richard E Fackenthal, Haitao Liu
  • Patent number: 11942136
    Abstract: Some embodiments include apparatuses and methods operating the apparatuses. One of the apparatuses includes a first data line located over a substrate, a second data line located over the first data line, a third data line located over the second data line and electrically separated from the first and second data lines, and a memory cell coupled to the first, second, and third data lines. The memory cell includes a first material between the first and second data lines and electrically coupled to the first and second data lines; a second material located over the first data line and the first material, the second material electrically separated from the first material and electrically coupled to the third data line; and a memory element electrically coupled to the second material and electrically separated from the first material and first and second data lines.
    Type: Grant
    Filed: August 15, 2022
    Date of Patent: March 26, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Karthik Sarpatwari, Kamal M. Karda, Durai Vishak Nirmal Ramaswamy
  • Publication number: 20240099026
    Abstract: Semiconductor devices are disclosed. A semiconductor device may include a hybrid transistor configured in a vertical orientation. The hybrid transistor may include a gate electrode, a drain material, a source material, and a channel material operatively coupled between the drain material and the source material. The source material and the drain material include a first material and the channel material includes a second, different material.
    Type: Application
    Filed: November 27, 2023
    Publication date: March 21, 2024
    Inventors: Kamal M. Karda, Haitao Liu, Durai Vishak Nirmal Ramaswamy
  • Patent number: 11935574
    Abstract: A memory cell comprises a capacitor comprising a first capacitor electrode having laterally-spaced walls, a second capacitor electrode comprising a portion above the first capacitor electrode, and capacitor insulator material between the second capacitor electrode and the first capacitor electrode. The capacitor comprises an intrinsic current leakage path from one of the first and second capacitor electrodes to the other through the capacitor insulator material. A parallel current leakage path is between the second capacitor electrode and the first capacitor electrode. The parallel current leakage path is circuit-parallel with the intrinsic current leakage path, of lower total resistance than the intrinsic current leakage path, and comprises leaker material that is everywhere laterally-outward of laterally-innermost surfaces of the laterally-spaced walls of the first capacitor electrode. Other embodiments, including methods, are disclosed.
    Type: Grant
    Filed: October 7, 2021
    Date of Patent: March 19, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Michael Mutch, Ashonita A. Chavan, Sameer Chhajed, Beth R. Cook, Kamal Kumar Muthukrishnan, Durai Vishak Nirmal Ramaswamy, Lance Williamson
  • Patent number: 11937433
    Abstract: An example of an apparatus includes a plurality of memory cells. At least a portion of the memory cells have a bottom electrode with each bottom electrode being at least partially electrically isolated from remaining ones of the bottom electrodes. At least one resistive interconnect electrically couples two or more of the bottom electrodes. The resistive interconnect is arranged to discharge at least a portion of excess charge from the two or more bottom electrodes. Additional apparatuses and methods of forming the apparatuses are disclosed.
    Type: Grant
    Filed: June 15, 2022
    Date of Patent: March 19, 2024
    Assignee: Micron Technology, Inc.
    Inventor: Durai Vishak Nirmal Ramaswamy
  • Patent number: 11925031
    Abstract: A method of forming an array of capacitors comprises forming rows and columns of horizontally-spaced openings in a sacrificial material. Fill material is formed in multiple of the columns of the openings and lower capacitor electrodes a are formed in a plurality of the columns that are between the columns of the openings comprising the fill material therein. The fill material is of different composition from that of the lower capacitor electrodes. The fill material is between a plurality of horizontally-spaced groups that individually comprises the lower capacitor electrodes. Immediately-adjacent of the groups are horizontally spaced apart from one another by a gap that comprises at least one of the columns of the openings comprising the fill material therein. The sacrificial material is removed to expose laterally-outer sides of the lower capacitor electrodes. A capacitor insulator is formed over tops and the laterally-outer sides of the lower capacitor electrodes.
    Type: Grant
    Filed: September 22, 2022
    Date of Patent: March 5, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Fatma Arzum Simsek-Ege, Durai Vishak Nirmal Ramaswamy
  • Publication number: 20240074138
    Abstract: Some embodiments include apparatuses and methods of forming the apparatuses. One of the apparatuses includes a first data line; a second data line adjacent the first data line and separated from the first data line by a first dielectric structure; and a memory cell formed over the first and second data lines. The memory cell includes a first transistor including a first channel region formed over and coupled to the first data line, and a charge storage structure separated from the first channel region; a second transistor including a second channel region formed over and coupled to the second data line, wherein the charge storage structure is formed over and coupled to the second channel region; and a second dielectric structure between the first channel region and each of the second channel region and the charge storage structure.
    Type: Application
    Filed: August 25, 2023
    Publication date: February 29, 2024
    Inventors: Durai Vishak Nirmal Ramaswamy, Karthik Sarpatwari, Kamal M. Karda, Pankaj Sharma
  • Publication number: 20240074211
    Abstract: Some embodiments include apparatuses and methods of operating the apparatuses. One of the apparatuses includes a conductive region; a memory cell including a memory element, a first portion, a second portion, a dielectric portion, and a third portion; and a data line formed over the second and third portions of the memory cell. The memory element is formed over the conductive region. The first portion is formed over the memory element and includes a first conductive material. The second portion is formed over the first portion and includes a second conductive material. The dielectric portion includes a first side adjacent the memory element, the first portion, and the second portion. The third portion includes a third conductive material and is adjacent a second side of the dielectric portion and separated from the memory element, the first portion, and the second portion by the dielectric portion.
    Type: Application
    Filed: August 25, 2023
    Publication date: February 29, 2024
    Inventors: Kamal M. Karda, Chandra Mouli, Haitao Liu, Durai Vishak Nirmal Ramaswamy
  • Publication number: 20240074216
    Abstract: Some embodiments include an integrated assembly having a first semiconductor material between two regions of a second semiconductor material. The second semiconductor material is a different composition than the first semiconductor material. Hydrogen is diffused within the first and second semiconductor materials. The conductivity of the second semiconductor material increases in response to the hydrogen diffused therein to thereby create a structure having the second semiconductor material as source/drain regions, and having the first semiconductor material as a channel region between the source/drain regions. A transistor gate is adjacent the channel region and is configured to induce an electric field within the channel region. Some embodiments include methods of forming integrated assemblies.
    Type: Application
    Filed: November 8, 2023
    Publication date: February 29, 2024
    Applicant: Micron Technology, Inc.
    Inventors: Kamal M. Karda, Yi Fang Lee, Haitao Liu, Durai Vishak Nirmal Ramaswamy, Ramanathan Gandhi, Karthik Sarpatwari, Scott E. Sills, Sameer Chhajed
  • Patent number: 11917834
    Abstract: Some embodiments include an integrated assembly having a first bottom electrode adjacent to a second bottom electrode. An intervening region is directly between the first and second bottom electrodes. Capacitor-insulative-material is adjacent to the first and second bottom electrodes. The capacitor-insulative-material is substantially not within the intervening region. Top-electrode-material is adjacent to the capacitor-insulative-material. Some embodiments include methods of forming integrated assemblies.
    Type: Grant
    Filed: July 20, 2021
    Date of Patent: February 27, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Durai Vishak Nirmal Ramaswamy, Marcello Mariani, Giorgio Servalli
  • Patent number: 11908913
    Abstract: A semiconductor device is disclosed. The semiconductor device includes a transistor including a source contact, a drain contact, and a channel region including an oxide semiconductor material as the channel material. At least one of the drain contact or the source contact includes a conductive material, such as ruthenium, to reduce the Schottky effects at the interface with the channel material.
    Type: Grant
    Filed: April 28, 2022
    Date of Patent: February 20, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Durai Vishak Nirmal Ramaswamy, Ramanathan Gandhi, Scott E. Sills
  • Patent number: 11910597
    Abstract: Some embodiments include an integrated assembly having a carrier-sink-structure, and having digit lines over the carrier-sink-structure. Transistor body regions are over the digit lines. Extensions extend from the carrier-sink-structure to the transistor body regions. The extensions are configured to drain excess carriers from the transistor body regions. Lower source/drain regions are between the transistor body regions and the digit lines, and are coupled with the digit lines. Upper source/drain regions are over the transistor body regions, and are coupled with storage elements. Gates are adjacent the transistor body regions. The transistor body regions, lower source/drain regions and upper source/drain regions are together comprised a plurality of transistors. The transistors and the storage elements are together comprised by a plurality of memory cells of a memory array. Some embodiments include methods of forming integrated assemblies.
    Type: Grant
    Filed: May 2, 2022
    Date of Patent: February 20, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Kamal M. Karda, Haitao Liu, Durai Vishak Nirmal Ramaswamy, Yunfei Gao, Sanh D. Tang, Deepak Chandra Pandey
  • Publication number: 20240047356
    Abstract: Some embodiments include apparatuses and methods of forming the apparatuses. One of the apparatuses includes a data line, a memory cell coupled to the data line, a ground connection, and a conductive line. The memory cell includes a first transistor and a second transistor. The first transistor includes a first region electrically coupled to the data line, and a charge storage structure electrically separated from the first region. The second transistor includes a second region electrically coupled to the charge storage structure and the data line. The ground connection is coupled to the first region of the first transistor. The conductive line is electrically separated from the first and second regions and spans across part of the first region of the first transistor and part of the second region of the second transistor and forming a gate of the first and second transistors.
    Type: Application
    Filed: August 16, 2023
    Publication date: February 8, 2024
    Inventors: Kamal M. Karda, Karthik Sarpatwari, Haitao Liu, Durai Vishak Nirmal Ramaswamy
  • Patent number: 11871589
    Abstract: Some embodiments include apparatuses and methods using a substrate, a pillar having a length perpendicular to the substrate, a first conductive plate, a second conductive plate, a memory cell located between the first and second conductive plates and electrically separated from the first and second conductive plates, and a conductive connection. The first conductive plate is located in a first level of the apparatus and being separated from the pillar by a first dielectric located in the first level. The second conductive plate is located in a second level of the apparatus and being separated from the pillar by a second dielectric located in the second level. The memory cell includes a first semiconductor material located in a third level of the apparatus between the first and second levels and contacting the pillar and the conductive connection, and a second semiconductor material located in a fourth level of the apparatus between the first and second levels and contacting the pillar.
    Type: Grant
    Filed: May 16, 2022
    Date of Patent: January 9, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Kamal M. Karda, Karthik Sarpatwari, Haitao Liu, Durai Vishak Nirmal Ramaswamy