Patents by Inventor Rekha Rajaram

Rekha Rajaram 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: 10392560
    Abstract: Compositions useful for the selective removal of titanium nitride and/or photoresist etch residue materials relative to metal conducting, e.g., tungsten, and insulating materials from a microelectronic device having same thereon. The removal compositions contain at least one oxidant and one etchant, may contain various corrosion inhibitors to ensure selectivity.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: August 27, 2019
    Assignee: ENTEGRIS, INC.
    Inventors: Jeffrey A. Barnes, Emanuel I. Cooper, Li-Min Chen, Steven Lippy, Rekha Rajaram, Sheng-Hung Tu
  • Patent number: 10170373
    Abstract: A method of fabricating advanced multi-threshold field effect transistors using a replacement metal gate process. A first method includes thinning layers composed of multilayer film stacks and incorporating a portion of the remaining thinned film in some transistors. A second method includes patterning dopant materials for a high-k dielectric by using thinning layers composed of multilayer thin film stacks, or in other embodiments, by a single thinning layer.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: January 1, 2019
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Balaji Kannan, Rekha Rajaram, Unoh Kwon
  • Patent number: 9824930
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tinv (inverse of gate capacitance) mismatch.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: November 21, 2017
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Publication number: 20170260449
    Abstract: Compositions useful for the selective removal of titanium nitride and/or photoresist etch residue materials relative to metal conducting, e.g., tungsten, and insulating materials from a microelectronic device having same thereon. The removal compositions contain at least one oxidant and one etchant, may contain various corrosion inhibitors to ensure selectivity.
    Type: Application
    Filed: January 17, 2017
    Publication date: September 14, 2017
    Inventors: Jeffrey A. BARNES, Emanuel I. COOPER, Li-Min CHEN, Steven LIPPY, Rekha RAJARAM, Sheng-Hung TU
  • Patent number: 9721842
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tinv (inverse of gate capacitance) mismatch.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: August 1, 2017
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Patent number: 9546321
    Abstract: Compositions useful for the selective removal of titanium nitride and/or photoresist etch residue materials relative to metal conducting, e.g., tungsten, and insulating materials from a microelectronic device having same thereon. The removal compositions contain at least one oxidant and one etchant, may contain various corrosion inhibitors to ensure selectivity.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: January 17, 2017
    Assignee: ADVANCED TECHNOLOGY MATERIALS, INC.
    Inventors: Jeffrey A. Barnes, Emanuel I. Cooper, Li-Min Chen, Steven Lippy, Rekha Rajaram, Sheng-Hung Tu
  • Publication number: 20160351452
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tiny (inverse of gate capacitance) mismatch.
    Type: Application
    Filed: August 10, 2016
    Publication date: December 1, 2016
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Patent number: 9472419
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tinv (inverse of gate capacitance) mismatch.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: October 18, 2016
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Patent number: 9418995
    Abstract: Embodiments of the present invention provide CMOS structures and methods of gate formation that combine a keep-cap scheme in which a protective layer is maintained on a PFET during a replacement metal gate process that utilizes an NFET-first process flow. Selective nitridation is used to provide nitrogen to the NFET while the PFET is protected from nitrogen by the keep-cap. Additional dopants are provided to the NFET using a gate stack dopant material (GSDM) layer.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: August 16, 2016
    Assignee: GLOBALFOUNDRIES Inc.
    Inventors: Balaji Kannan, Unoh Kwon, Rekha Rajaram
  • Publication number: 20160190015
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tinv (inverse of gate capacitance) mismatch.
    Type: Application
    Filed: March 2, 2016
    Publication date: June 30, 2016
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Patent number: 9343372
    Abstract: A method includes forming an n-FET device and a p-FET device on a substrate, each of the n-FET device and the p-FET device include a metal gate stack consisting of a titanium-aluminum carbide (TiAlC) layer above and in direct contact with a titanium nitride (TiN) cap, and removing, from the p-FET device, the TiAlC layer selective to the TiN cap. The removal of the TiAlC layer includes using a selective TiAlC to TiN wet etch chemistry solution with a substantially high TiAlC to TiN etch ratio such that the TiN cap remains in the p-FET device.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: May 17, 2016
    Assignee: GlobalFoundries, Inc.
    Inventors: Ruqiang Bao, Unoh Kwon, Rekha Rajaram, Keith Kwong Hon Wong
  • Patent number: 9330938
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tinv (inverse of gate capacitance) mismatch.
    Type: Grant
    Filed: July 24, 2014
    Date of Patent: May 3, 2016
    Assignee: International Business Machines Corporation
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Publication number: 20160104707
    Abstract: Embodiments of the present invention provide CMOS structures and methods of gate formation that combine a keep-cap scheme in which a protective layer is maintained on a PFET during a replacement metal gate process that utilizes an NFET-first process flow. Selective nitridation is used to provide nitrogen to the NFET while the PFET is protected from nitrogen by the keep-cap. Additional dopants are provided to the NFET using a gate stack dopant material (GSDM) layer.
    Type: Application
    Filed: October 14, 2014
    Publication date: April 14, 2016
    Applicant: GLOBALFOUNDRIES Inc.
    Inventors: Balaji Kannan, Unoh Kwon, Rekha Rajaram
  • Publication number: 20160086860
    Abstract: A method of fabricating advanced multi-threshold field effect transistors using a replacement metal gate process. A first method includes thinning layers composed of multilayer film stacks and incorporating a portion of the remaining thinned film in some transistors. A second method includes patterning dopant materials for a high-k dielectric by using thinning layers composed of multilayer thin film stacks, or in other embodiments, by a single thinning layer.
    Type: Application
    Filed: September 24, 2014
    Publication date: March 24, 2016
    Inventors: Balaji Kannan, Rekha Rajaram, Unoh Kwon
  • Publication number: 20160049337
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tinv (inverse of gate capacitance) mismatch.
    Type: Application
    Filed: October 22, 2015
    Publication date: February 18, 2016
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Publication number: 20160027664
    Abstract: A method of fabricating advanced node field effect transistors using a replacement metal gate process. The method includes dopant a high-k dielectric directly or indirectly by using layers composed of multi-layer thin film stacks, or in other embodiments, by a single blocking layer. By taking advantage of unexpected etch selectivity of the multi-layer stack or the controlled etch process of a single layer stack, etch damage to the high-k may be avoided and work function metal thicknesses can be tightly controlled which in turn allows field effect transistors with low Tiny (inverse of gate capacitance) mismatch.
    Type: Application
    Filed: July 24, 2014
    Publication date: January 28, 2016
    Inventors: Takashi Ando, Hemanth Jagannathan, Balaji Kannan, Siddarth A. Krishnan, Unoh Kwon, Rekha Rajaram
  • Publication number: 20150307818
    Abstract: Cleaning compositions and processes for cleaning post-plasma etch residue from a microelectronic device having said residue thereon. The composition achieves highly efficacious cleaning of the residue material, including titanium-containing, copper-containing, tungsten-containing, and/or cobalt-containing post-etch residue from the microelectronic device while simultaneously not damaging the interlevel dielectric, metal interconnect material, and/or capping layers also present thereon.
    Type: Application
    Filed: June 22, 2015
    Publication date: October 29, 2015
    Inventors: Jeffrey A. Barnes, Steven Lippy, Peng Zhang, Rekha Rajaram
  • Patent number: 9063431
    Abstract: Cleaning compositions and processes for cleaning post-plasma etch residue from a microelectronic device having said residue thereon. The composition achieves highly efficacious cleaning of the residue material, including titanium-containing, copper-containing, tungsten-containing, and/or cobalt-containing post-etch residue from the microelectronic device while simultaneously not damaging the interlevel dielectric, metal interconnect material, and/or capping layers also present thereon.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: June 23, 2015
    Assignee: ADVANCED TECHNOLOGY MATERIALS, INC.
    Inventors: Jeffrey A. Barnes, Steven Lippy, Peng Zhang, Rekha Rajaram
  • Publication number: 20150162213
    Abstract: Compositions and methods for substantially and efficiently removing NiPt (1-25%) material from microelectronic devices having same thereon. The compositions are substantially compatible with other materials present on the microelectronic device such as gate metal materials.
    Type: Application
    Filed: May 10, 2013
    Publication date: June 11, 2015
    Applicant: ADVANCED TECHNOLOGY MATERIALS, INC.
    Inventors: Tianniu Chen, Steven M. Bilodeau, Emanuel I. Cooper, Li-Min Chen, Jeffrey A. Barnes, Mark Biscotto, Karl E. Boggs, Rekha Rajaram
  • Patent number: 9031700
    Abstract: A high productivity combinatorial system can be configured with sensors to automatically sense an identification tag of an installed reactor assembly, which comprises corresponding sensing elements. Configuration and usage data of the install reactor assembly can be retrieved from the identification tag, allowing the combinatorial system to properly access the reactor regions in the reactor assembly.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: May 12, 2015
    Assignee: Intermolecular, Inc.
    Inventors: Makonnen Payne, Rekha Rajaram