Patents by Inventor Eswar Ramanathan

Eswar Ramanathan 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: 12453102
    Abstract: The present disclosure relates to semiconductor structures and, more particularly, to a vertical memory devices and methods of manufacture. The structure includes: a first bit cell with a first top electrode; a second bit cell with a second top electrode; and a common bottom electrode for both the first bit cell and the second bit cell.
    Type: Grant
    Filed: May 12, 2022
    Date of Patent: October 21, 2025
    Assignee: GLOBALFOUNDRIES U.S. Inc.
    Inventors: Sunil Kumar Singh, Xuan Anh Tran, Eswar Ramanathan, Suryanarayana Kalaga, Craig M. Child, Robert Fox
  • Patent number: 11515205
    Abstract: One illustrative method disclosed herein includes forming at least one first layer of insulating material above an upper surface of a top electrode of a memory cell, forming a patterned etch stop layer above the at least one first layer of insulating material, wherein the patterned etch stop layer has an opening that is positioned vertically above at least a portion of the upper surface of the top electrode and forming at least one second layer of insulating material above an upper surface of the etch stop layer. The method also includes forming a conductive contact opening that extends through the etch stop layer to expose at least a portion of the upper surface of the top electrode and forming a conductive contact structure in the conductive contact opening, wherein the conductive contact structure is conductively coupled to the upper surface of the top electrode.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: November 29, 2022
    Assignee: GlobalFoundries U.S. Inc.
    Inventors: Eswar Ramanathan, Sunil Kumar Singh, Xuan Anh Tran, Suryanarayana Kalaga, Juan Boon Tan
  • Publication number: 20220271090
    Abstract: The present disclosure relates to semiconductor structures and, more particularly, to a vertical memory devices and methods of manufacture. The structure includes: a first bit cell with a first top electrode; a second bit cell with a second top electrode; and a common bottom electrode for both the first bit cell and the second bit cell.
    Type: Application
    Filed: May 12, 2022
    Publication date: August 25, 2022
    Inventors: Sunil Kumar SINGH, Xuan Anh TRAN, Eswar RAMANATHAN, Suryanarayana KALAGA, Craig M. CHILD, Robert FOX
  • Patent number: 11367750
    Abstract: The present disclosure relates to semiconductor structures and, more particularly, to a vertical memory devices and methods of manufacture. The structure includes: a first bit cell with a first top electrode; a second bit cell with a second top electrode; and a common bottom electrode for both the first bit cell and the second bit cell.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: June 21, 2022
    Assignee: GLOBALFOUNDRIES U.S. INC.
    Inventors: Sunil Kumar Singh, Xuan Anh Tran, Eswar Ramanathan, Suryanarayana Kalaga, Craig M. Child, Robert Fox
  • Patent number: 11233191
    Abstract: Integrated circuits with embedded memory structures, and methods for fabricating integrated circuits are provided. An exemplary method for fabricating an integrated circuit includes forming first and second conductive interconnects over a semiconductor substrate. The method includes depositing a conductive material over the first conductive interconnect. Also, the method includes forming a memory structure over the conductive material, wherein the memory structure has an uppermost surface distanced from the first conductive interconnect by a first height. Further, the method includes forming an interlayer dielectric over the memory structure and forming a conductive via coupled to the second conductive interconnect, wherein the conductive via has a second height over the second conductive interconnect less than the first height. The method also includes forming first and second contact plugs through the interlayer dielectric.
    Type: Grant
    Filed: September 26, 2018
    Date of Patent: January 25, 2022
    Assignee: GlobalFoundries U.S. Inc.
    Inventors: Ajey P. Jacob, Eswar Ramanathan
  • Patent number: 11211448
    Abstract: A capacitor structure for an integrated circuit (IC) is provided. The capacitor structure includes a plurality of spaced metal pillars with each metal pillar positioned on a corresponding underlying metal wire of an underlying metal layer. A metal-insulator-metal layer is positioned over and between the metal pillars. At least one contact is operatively coupled to a first metal pillar of the plurality of metal pillars. The metal-insulator-metal layer creates a MIM capacitor that undulates over the metal pillars, creating a higher density capacitance compared to conventional planar MIM capacitors. The metal pillars extend into the metal-insulator-metal layer, which reduces contact resistance. The capacitor structure can be integrated into an IC with no major integration issues. A related method is also provided.
    Type: Grant
    Filed: December 5, 2019
    Date of Patent: December 28, 2021
    Assignee: GlobalFoundries U.S. Inc.
    Inventors: Sunil K. Singh, Eswar Ramanathan
  • Patent number: 11094585
    Abstract: One illustrative method disclosed herein includes, among other things, selectively forming a sacrificial material on an upper surface of a top electrode of a memory cell, forming at least one layer of insulating material around the sacrificial material and removing the sacrificial material so as to form an opening in the at least one layer of insulating material, wherein the opening exposes the upper surface of the top electrode. The method also includes forming an internal sidewall spacer within the opening in the at least one layer of insulating material and forming a conductive contact structure that is conductively coupled to the upper surface of the top electrode, wherein a portion of the conductive contact structure is surrounded by the internal sidewall spacer.
    Type: Grant
    Filed: July 8, 2019
    Date of Patent: August 17, 2021
    Assignee: GLOBALFOUNDRIES U.S. INC.
    Inventors: Xuan Anh Tran, Eswar Ramanathan, Sunil Kumar Singh, Suryanarayana Kalaga, Suresh Kumar Regonda, Juan Boon Tan
  • Publication number: 20210175323
    Abstract: A capacitor structure for an integrated circuit (IC) is provided. The capacitor structure includes a plurality of spaced metal pillars with each metal pillar positioned on a corresponding underlying metal wire of an underlying metal layer. A metal-insulator-metal layer is positioned over and between the metal pillars. At least one contact is operatively coupled to a first metal pillar of the plurality of metal pillars. The metal-insulator-metal layer creates a MIM capacitor that undulates over the metal pillars, creating a higher density capacitance compared to conventional planar MIM capacitors. The metal pillars extend into the metal-insulator-metal layer, which reduces contact resistance. The capacitor structure can be integrated into an IC with no major integration issues. A related method is also provided.
    Type: Application
    Filed: December 5, 2019
    Publication date: June 10, 2021
    Inventors: Sunil K. Singh, Eswar Ramanathan
  • Publication number: 20210066126
    Abstract: One illustrative method disclosed herein includes forming at least one first layer of insulating material above an upper surface of a top electrode of a memory cell, forming a patterned etch stop layer above the at least one first layer of insulating material, wherein the patterned etch stop layer has an opening that is positioned vertically above at least a portion of the upper surface of the top electrode and forming at least one second layer of insulating material above an upper surface of the etch stop layer. The method also includes forming a conductive contact opening that extends through the etch stop layer to expose at least a portion of the upper surface of the top electrode and forming a conductive contact structure in the conductive contact opening, wherein the conductive contact structure is conductively coupled to the upper surface of the top electrode.
    Type: Application
    Filed: August 30, 2019
    Publication date: March 4, 2021
    Inventors: Eswar Ramanathan, Sunil Kumar Singh, Xuan Anh Tran, Suryanarayana Kalaga, Juan Boon Tan
  • Publication number: 20210013095
    Abstract: One illustrative method disclosed herein includes, among other things, selectively forming a sacrificial material on an upper surface of a top electrode of a memory cell, forming at least one layer of insulating material around the sacrificial material and removing the sacrificial material so as to form an opening in the at least one layer of insulating material, wherein the opening exposes the upper surface of the top electrode. The method also includes forming an internal sidewall spacer within the opening in the at least one layer of insulating material and forming a conductive contact structure that is conductively coupled to the upper surface of the top electrode, wherein a portion of the conductive contact structure is surrounded by the internal sidewall spacer.
    Type: Application
    Filed: July 8, 2019
    Publication date: January 14, 2021
    Inventors: Xuan Anh Tran, Eswar Ramanathan, Sunil Kumar Singh, Suryanarayana Kalaga, Suresh Kumar Regonda, Juan Boon Tan
  • Publication number: 20200395541
    Abstract: The present disclosure relates to semiconductor structures and, more particularly, to a vertical memory devices and methods of manufacture. The structure includes: a first bit cell with a first top electrode; a second bit cell with a second top electrode; and a common bottom electrode for both the first bit cell and the second bit cell.
    Type: Application
    Filed: June 12, 2019
    Publication date: December 17, 2020
    Inventors: Sunil Kumar SINGH, Xuan Anh TRAN, Eswar RAMANATHAN, Suryanarayana KALAGA, Craig M. CHILD, Robert FOX
  • Publication number: 20200098976
    Abstract: Integrated circuits with embedded memory structures, and methods for fabricating integrated circuits are provided. An exemplary method for fabricating an integrated circuit includes forming first and second conductive interconnects over a semiconductor substrate. The method includes depositing a conductive material over the first conductive interconnect. Also, the method includes forming a memory structure over the conductive material, wherein the memory structure has an uppermost surface distanced from the first conductive interconnect by a first height. Further, the method includes forming an interlayer dielectric over the memory structure and forming a conductive via coupled to the second conductive interconnect, wherein the conductive via has a second height over the second conductive interconnect less than the first height. The method also includes forming first and second contact plugs through the interlayer dielectric.
    Type: Application
    Filed: September 26, 2018
    Publication date: March 26, 2020
    Inventors: Ajey P. Jacob, Eswar Ramanathan
  • Patent number: 10510675
    Abstract: Embodiments of the disclosure provide a substrate structure for an integrated circuit (IC) structure, including: a first dielectric layer positioned above a semiconductor substrate; a first plurality of trenches extending at least partially into the first dielectric layer from an upper surface of the first dielectric layer; and a first metal formed within the first plurality of trenches, wherein a spatial arrangement of the first plurality of trenches causes coupling of surface plasmons in the first metal to at least one wavelength of an incident light.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: December 17, 2019
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Somnath Ghosh, Eswar Ramanathan, Qanit Takmeel, Ming He, Jeric Sarad, Ashwini Chandrashekar, Colin Bombardier, Anbu Selvam KM Mahalingam, Keith P. Donegan, Prakash Periasamy
  • Publication number: 20190244911
    Abstract: Embodiments of the disclosure provide a substrate structure for an integrated circuit (IC) structure, including: a first dielectric layer positioned above a semiconductor substrate; a first plurality of trenches extending at least partially into the first dielectric layer from an upper surface of the first dielectric layer; and a first metal formed within the first plurality of trenches, wherein a spatial arrangement of the first plurality of trenches causes coupling of surface plasmons in the first metal to at least one wavelength of an incident light.
    Type: Application
    Filed: February 5, 2018
    Publication date: August 8, 2019
    Inventors: Somnath Ghosh, Eswar Ramanathan, Qanit Takmeel, Ming He, Jeric Sarad, Ashwini Chandrashekar, Colin Bombardier, Anbu Selvam KM Mahalingam, Keith P. Donegan, Prakash Periasamy