Patents by Inventor Rajasekhar Venigalla

Rajasekhar Venigalla 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: 11961556
    Abstract: Methods, systems, and devices supporting a socket design for a memory device are described. A die may include one or more memory arrays, which each may include any number of word lines and any number of bit lines. The word lines and the bit lines may be oriented in different directions, and memory cells may be located at the intersections of word lines and bit lines. Sockets may couple the word lines and bit lines to associated drivers, and the sockets may be located such that memory cells farther from a corresponding word line socket are nearer a corresponding bit line socket, and vice versa. For example, sockets may be disposed in rows or regions that are parallel to one another, and which may be non-orthogonal to the corresponding word lines and bit lines.
    Type: Grant
    Filed: January 4, 2022
    Date of Patent: April 16, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Amitava Majumdar, Radhakrishna Kotti, Rajasekhar Venigalla
  • Patent number: 11882774
    Abstract: Methods, systems, and devices for a low resistance crosspoint architecture are described. A manufacturing system may deposit a thermal barrier material, followed by a first layer of a first conductive material, on a layered assembly including a patterned layer of electrode materials and a patterned layer of a memory material. The manufacturing system may etch a first area of the layered assembly to form a gap in the first layer of the first conductive material, the thermal barrier material, the patterned layer of the memory material, and the patterned layer of electrode materials. The manufacturing system may deposit a second conductive material to form a conductive via in the gap, where the conductive via extends to a height within the layered assembly that is above the thermal barrier material.
    Type: Grant
    Filed: September 7, 2021
    Date of Patent: January 23, 2024
    Assignee: Micron Technology, Inc.
    Inventors: Rajasekhar Venigalla, Patrick M. Flynn, Josiah Jebaraj Johnley Muthuraj, Efe Sinan Ege, Kevin Lee Baker, Tao Nguyen, Davis Weymann
  • Publication number: 20230395150
    Abstract: A microelectronic device includes a stack structure including blocks separated from one another by dielectric slot structures and each including a vertically alternating sequence of conductive structures and insulative structures arranged in tiers. The blocks including a stadium structure including opposing staircase structures each having steps comprising edges of the tiers. The blocks further include a filled trench vertically overlying and within horizontal boundaries of the stadium structure. The filled trench includes dielectric liner structures and additional dielectric liner structures having a different material composition than that of the dielectric liner structures and alternating with the dielectric liner structures. The filled trench also includes dielectric fill material overlying an alternating sequence of the dielectric liner structures and additional dielectric liner structures.
    Type: Application
    Filed: June 1, 2023
    Publication date: December 7, 2023
    Inventors: Rui Zhang, Shuangqiang Luo, Mohad Baboli, Rajasekhar Venigalla
  • Publication number: 20230343393
    Abstract: A method used in forming a memory array comprising strings of memory cells comprises forming a stack comprising vertically-alternating first tiers and second tiers directly above a conductor tier that comprises silicon-containing material. The stack comprises laterally-spaced memory-block regions and a through-array-via (TAV) region. The stack comprises channel-material strings that extend through the first tiers and the second tiers in the memory-block regions. The stack comprises TAV openings in the TAV region that extend to the silicon-containing material of the conductor tier. A metal halide is reacted with the silicon of the silicon-containing material to deposit the metal of the metal halide in the conductor tier. After depositing the metal, conductive material is formed in the TAV openings directly against the deposited metal and therefrom a TAV is formed in individual of the TAV openings that comprises the conductive material and the deposited metal. Structure embodiments are disclosed.
    Type: Application
    Filed: April 22, 2022
    Publication date: October 26, 2023
    Applicant: Micron Technology, Inc.
    Inventors: Jordan D. Greenlee, Rajasekhar Venigalla, Tom George
  • Patent number: 11778837
    Abstract: A memory system may include separate amounts or types of resistive material that may be deposited over memory cells and conductive vias using separate resistive layers in the access lines. A first resistive material layer may be deposited over the memory cells prior to performing an array termination etch used to deposit the conductive via. The array termination etch may remove the first resistive material over the portion of the array used to deposit the conductive via. A second resistive material layer may be deposited after the etch has occurred and the conductive via has been formed. The second resistive material layer may be deposited over the conductive via.
    Type: Grant
    Filed: June 22, 2022
    Date of Patent: October 3, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Lei Wei, Pengyuan Zheng, Kevin Lee Baker, Efe Sinan Ege, Adam Thomas Barton, Rajasekhar Venigalla
  • Patent number: 11776957
    Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.
    Type: Grant
    Filed: December 7, 2022
    Date of Patent: October 3, 2023
    Assignee: TESSERA LLC
    Inventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
  • Publication number: 20230282641
    Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.
    Type: Application
    Filed: December 7, 2022
    Publication date: September 7, 2023
    Inventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
  • Publication number: 20230207469
    Abstract: A memory array comprising strings of memory cells comprise laterally-spaced memory blocks individually comprising a vertical stack comprising alternating insulative tiers and conductive tiers directly above a conductor tier. Strings of memory cells comprise channel-material strings that extend through the insulative tiers and the conductive tiers. The channel-material strings directly electrically couple with conductor material of the conductor tier. A through-array-via (TAV) region comprises TAV constructions that individually extend through the insulative tiers and the conductive tiers into the conductor tier. Individual of the TAV constructions comprise an upper portion directly above and joined with a lower portion. The individual TAV constructions comprise at least one external jog surface in a vertical cross-section where the upper and lower portions join. Other embodiments, including method, are disclosed.
    Type: Application
    Filed: January 24, 2022
    Publication date: June 29, 2023
    Applicant: Micron Technology, Inc.
    Inventors: Damir Fazil, Indra V. Chary, Nancy M. Lomeli, Rajasekhar Venigalla
  • Publication number: 20230170024
    Abstract: A memory array comprising strings of memory cells comprises laterally-spaced memory blocks individually comprising a vertical stack comprising alternating insulative tiers and conductive tiers directly above a conductor tier. Strings of memory cells comprise channel-material strings that extend through the insulative tiers and the conductive tiers. The channel-material strings directly electrically couple with conductor material of the conductor tier. A through-array-via (TAV) region comprises TAVs that individually extend through the insulative tiers and the conductive tiers into the conductor tier. Individual of the TAVs comprise an upper portion directly above and joined with a lower portion. The individual TAVs comprise at least one external jog surface in a vertical cross-section where the upper and lower portions join. The lower portion is wider in the vertical cross-section than the upper portion where the upper and lower portions join. Other embodiments, including method, are disclosed.
    Type: Application
    Filed: November 30, 2021
    Publication date: June 1, 2023
    Applicant: Micron Technology, Inc.
    Inventors: Nancy M. Lomeli, Rajasekhar Venigalla
  • Patent number: 11552077
    Abstract: A method of forming a power rail to semiconductor devices comprising removing a portion of the gate structure forming a gate cut trench separating a first active region of fin structures from a second active region of fin structures. A conformal etch stop layer is formed in the gate cut trench. A fill material is formed on the conformal etch stop layer filling at least a portion of the gate cut trench. The fill material has a composition that is etched selectively to the conformal etch stop layer. A power rail is formed in the gate cut trench. The conformal etch stop layer obstructs lateral etching during forming the power rail to substantially eliminate power rail to gate structure shorting.
    Type: Grant
    Filed: April 2, 2021
    Date of Patent: January 10, 2023
    Assignee: TESSERA LLC
    Inventors: Marc A. Bergendahl, Andrew M. Greene, Rajasekhar Venigalla
  • Publication number: 20220406847
    Abstract: A memory system may include separate amounts or types of resistive material that may be deposited over memory cells and conductive vias using separate resistive layers in the access lines. A first resistive material layer may be deposited over the memory cells prior to performing an array termination etch used to deposit the conductive via. The array termination etch may remove the first resistive material over the portion of the array used to deposit the conductive via. A second resistive material layer may be deposited after the etch has occurred and the conductive via has been formed. The second resistive material layer may be deposited over the conductive via.
    Type: Application
    Filed: June 22, 2022
    Publication date: December 22, 2022
    Inventors: Lei Wei, Pengyuan Zheng, Kevin Lee Baker, Efe Sinan Ege, Adam Thomas Barton, Rajasekhar Venigalla
  • Publication number: 20220320316
    Abstract: A method of forming a nanosheet device, including forming a channel stack on a substrate, where the channel stack includes at least one nanosheet channel layer and at least one sacrificial release layer, forming a stack cover layer on at least a portion of the channel stack, forming a dummy gate on at least a portion of the stack cover layer, wherein at least a portion of the at least one nanosheet channel layer and at least one sacrificial release layer is exposed on opposite sides of the dummy gate, removing at least a portion of the at least one sacrificial release layer on each side of the dummy gate to form a sacrificial supporting rib, and forming an inner spacer layer on exposed portions of the at least one nanosheet channel layer and at least one sacrificial supporting rib.
    Type: Application
    Filed: April 22, 2022
    Publication date: October 6, 2022
    Inventors: Michael A. Guillorn, Terence B. Hook, Robert R. Robison, Reinaldo A. Vega, Rajasekhar Venigalla
  • Patent number: 11380732
    Abstract: A memory system may include separate amounts or types of resistive material that may be deposited over memory cells and conductive vias using separate resistive layers in the access lines. A first resistive material layer may be deposited over the memory cells prior to performing an array termination etch used to deposit the conductive via. The array termination etch may remove the first resistive material over the portion of the array used to deposit the conductive via. A second resistive material layer may be deposited after the etch has occurred and the conductive via has been formed. The second resistive material layer may be deposited over the conductive via.
    Type: Grant
    Filed: July 29, 2020
    Date of Patent: July 5, 2022
    Assignee: Micron Technology, Inc.
    Inventors: Lei Wei, Pengyuan Zheng, Kevin Lee Baker, Efe Sinan Ege, Adam Thomas Barton, Rajasekhar Venigalla
  • Publication number: 20220208264
    Abstract: Methods, systems, and devices supporting a socket design for a memory device are described. A die may include one or more memory arrays, which each may include any number of word lines and any number of bit lines. The word lines and the bit lines may be oriented in different directions, and memory cells may be located at the intersections of word lines and bit lines. Sockets may couple the word lines and bit lines to associated drivers, and the sockets may be located such that memory cells farther from a corresponding word line socket are nearer a corresponding bit line socket, and vice versa. For example, sockets may be disposed in rows or regions that are parallel to one another, and which may be non-orthogonal to the corresponding word lines and bit lines.
    Type: Application
    Filed: January 4, 2022
    Publication date: June 30, 2022
    Inventors: Amitava Majumdar, Radhakrishna Kotti, Rajasekhar Venigalla
  • Patent number: 11342446
    Abstract: A method of forming a nanosheet device, including forming a channel stack on a substrate, where the channel stack includes at least one nanosheet channel layer and at least one sacrificial release layer, forming a stack cover layer on at least a portion of the channel stack, forming a dummy gate on at least a portion of the stack cover layer, wherein at least a portion of the at least one nanosheet channel layer and at least one sacrificial release layer is exposed on opposite sides of the dummy gate, removing at least a portion of the at least one sacrificial release layer on each side of the dummy gate to form a sacrificial supporting rib, and forming an inner spacer layer on exposed portions of the at least one nanosheet channel layer and at least one sacrificial supporting rib.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: May 24, 2022
    Assignee: Tessera, Inc.
    Inventors: Michael A. Guillorn, Terence B. Hook, Robert R. Robison, Reinaldo A. Vega, Rajasekhar Venigalla
  • Patent number: 11276767
    Abstract: An additive core subtractive liner method is described for forming electrically conductive contacts. The method can include forming a first trench in an first dielectric layer to expose a first portion of a metal liner, and filling said first trench with a second dielectric layer. A metal cut trench is formed in the second dielectric layer. A portion of the metal liner exposed by the metal cut trench is removed with a subtractive method. The method continues with filling the metal cut trench with a dielectric fill, and replacing the remaining portions of the second dielectric layer with an additive core conductor to provide contacts to remaining portions of the metal liner.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: March 15, 2022
    Assignee: International Business Machines Corporation
    Inventors: Ruqiang Bao, Kisup Chung, Andrew M. Greene, Sivananda K. Kanakasabapathy, David L. Rath, Indira P. V. Seshadri, Rajasekhar Venigalla
  • Publication number: 20220069216
    Abstract: Methods, systems, and devices for a low resistance crosspoint architecture are described. A manufacturing system may deposit a thermal barrier material, followed by a first layer of a first conductive material, on a layered assembly including a patterned layer of electrode materials and a patterned layer of a memory material. The manufacturing system may etch a first area of the layered assembly to form a gap in the first layer of the first conductive material, the thermal barrier material, the patterned layer of the memory material, and the patterned layer of electrode materials. The manufacturing system may deposit a second conductive material to form a conductive via in the gap, where the conductive via extends to a height within the layered assembly that is above the thermal barrier material.
    Type: Application
    Filed: September 7, 2021
    Publication date: March 3, 2022
    Inventors: Rajasekhar Venigalla, Patrick M. Flynn, Josiah Jebaraj Johnley Muthuraj, Efe Sinan Ege, Kevin Lee Baker, Tao Nguyen, Davis Weymann
  • Publication number: 20220037403
    Abstract: A memory system may include separate amounts or types of resistive material that may be deposited over memory cells and conductive vias using separate resistive layers in the access lines. A first resistive material layer may be deposited over the memory cells prior to performing an array termination etch used to deposit the conductive via. The array termination etch may remove the first resistive material over the portion of the array used to deposit the conductive via. A second resistive material layer may be deposited after the etch has occurred and the conductive via has been formed. The second resistive material layer may be deposited over the conductive via.
    Type: Application
    Filed: July 29, 2020
    Publication date: February 3, 2022
    Inventors: Lei Wei, Pengyuan Zheng, Kevin Lee Baker, Efe Sinan Ege, Adam Thomas Barton, Rajasekhar Venigalla
  • Patent number: 11222695
    Abstract: Methods, systems, and devices supporting a socket design for a memory device are described. A die may include one or more memory arrays, which each may include any number of word lines and any number of bit lines. The word lines and the bit lines may be oriented in different directions, and memory cells may be located at the intersections of word lines and bit lines. Sockets may couple the word lines and bit lines to associated drivers, and the sockets may be located such that memory cells farther from a corresponding word line socket are nearer a corresponding bit line socket, and vice versa. For example, sockets may be disposed in rows or regions that are parallel to one another, and which may be non-orthogonal to the corresponding word lines and bit lines.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: January 11, 2022
    Assignee: Micron Technology, Inc.
    Inventors: Amitava Majumdar, Radhakrishna Kotti, Rajasekhar Venigalla
  • Patent number: 11152489
    Abstract: An additive core subtractive liner method is described for forming electrically conductive contacts. The method can include forming a first trench in a first dielectric layer to expose a first portion of a metal liner, and filling said first trench with a second dielectric layer. A metal cut trench is formed in the second dielectric layer. A portion of the metal liner exposed by the metal cut trench is removed with a subtractive method. The method continues with filling the metal cut trench with a dielectric fill, and replacing the remaining portions of the second dielectric layer with an additive core conductor to provide contacts to remaining portions of the metal liner.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: October 19, 2021
    Assignee: International Business Machines Corporation
    Inventors: Ruqiang Bao, Kisup Chung, Andrew M. Greene, Sivananda K. Kanakasabapathy, David L. Rath, Indira P. V. Seshadri, Rajasekhar Venigalla