Patents by Inventor Madhukar Bhaskara Rao

Madhukar Bhaskara Rao 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: 10711227
    Abstract: Composition, method and system for PVD TiN hard mask removal from 28/20 nm pattern wafers have been disclosed. The composition uses peroxide as oxidizing agent for PVD TiN hard mask removal under slightly basic conditions. The composition comprises bulky or long chain organic amines or polyalkylamine to improve removal/etching selectivity of PVD TiN vs CVD TiN. The composition further comprises long chain organic acids or amines to maintain Co compatibility.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: July 14, 2020
    Assignee: VERSUM MATERIALS US, LLC
    Inventors: Wen Dar Liu, Yi-Chia Lee, William Jack Casteel, Jr., Tianniu Chen, Rajiv Krishan Agarwal, Madhukar Bhaskara Rao
  • Patent number: 10354860
    Abstract: Described herein is an apparatus comprising a plurality of silicon-containing layers wherein the silicon-containing layers are selected from a silicon oxide and a silicon nitride layer or film. Also described herein are methods for forming the apparatus to be used, for example, as 3D vertical NAND flash memory stacks. In one particular aspect or the apparatus, the silicon oxide layer comprises slightly compressive stress and good thermal stability. In this or other aspects of the apparatus, the silicon nitride layer comprises slightly tensile stress and less than 300 MPa stress change after up to about 800° C. thermal treatment. In this or other aspects of the apparatus, the silicon nitride layer etches much faster than the silicon oxide layer in hot H3PO4, showing good etch selectivity.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: July 16, 2019
    Assignee: VERSUM MATERIALS US, LLC
    Inventors: Jianheng Li, Robert Gordon Ridgeway, Xinjian Lei, Raymond Nicholas Vrtis, Bing Han, Madhukar Bhaskara Rao
  • Patent number: 10145008
    Abstract: Described herein are compositions and methods using same for forming a silicon-containing film such as, without limitation, a carbon doped silicon oxide film, a carbon doped silicon nitride, a carbon doped silicon oxynitride film in a deposition process. In one aspect, the composition comprises at least cyclic carbosilane having at least one Si—C—Si linkage and at least one anchoring group selected from a halide atom, an amino group, and combinations thereof.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: December 4, 2018
    Assignee: VERSUM MATERIALS US, LLC
    Inventors: Haripin Chandra, Kirk Scott Cuthill, Anupama Mallikarjunan, Xinjian Lei, Matthew R. MacDonald, Manchao Xiao, Madhukar Bhaskara Rao, Jianheng Li
  • Publication number: 20180251711
    Abstract: Composition, method and system for PVD TiN hard mask removal from 28/20 nm pattern wafers have been disclosed. The composition uses peroxide as oxidizing agent for PVD TiN hard mask removal under slightly basic conditions. The composition comprises bulky or long chain organic amines or polyalkylamine to improve removal/etching selectivity of PVD TiN vs CVD TiN. The composition further comprises long chain organic acids or amines to maintain Co compatibility.
    Type: Application
    Filed: January 9, 2018
    Publication date: September 6, 2018
    Applicant: Versum Materials US, LLC
    Inventors: Wen Dar Liu, Yi-Chia Lee, William Jack Casteel, JR., Tianniu Chen, Rajiv Krishan Agarwal, Madhukar Bhaskara Rao
  • Patent number: 9976111
    Abstract: Composition, method and system for PVD TiN hard mask removal from 28/20 nm pattern wafers have been disclosed. The composition uses peroxide as oxidizing agent for PVD TiN hard mask removal under slightly basic conditions. The composition comprises bulky or long chain organic amines or polyalkylamine to improve removal/etching selectivity of PVD TiN vs CVD TiN. The composition further comprises long chain organic acids or amines to maintain Co compatibility.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: May 22, 2018
    Assignee: VERSUM MATERIALS US, LLC
    Inventors: Wen Dar Liu, Yi-Chia Lee, William Jack Casteel, Jr., Tianniu Chen, Rajiv Krishan Agarwal, Madhukar Bhaskara Rao
  • Publication number: 20180023192
    Abstract: Described herein are compositions and methods using same for forming a silicon-containing film such as, without limitation, a carbon doped silicon oxide film, a carbon doped silicon nitride, a carbon doped silicon oxynitride film in a deposition process. In one aspect, the composition comprises at least cyclic carbosilane having at least one Si—C—Si linkage and at least one anchoring group selected from a halide atom, an amino group, and combinations thereof.
    Type: Application
    Filed: February 4, 2016
    Publication date: January 25, 2018
    Inventors: Haripin Chandra, Kirk Scott Cuthill, Anupama Mallikarjunan, Xinjian Lei, Matthew R. MacDonald, Manchao Xiao, Madhukar Bhaskara Rao, Jianheng Li
  • Publication number: 20170107460
    Abstract: Composition, method and system for PVD TiN hard mask removal from 28/20 nm pattern wafers have been disclosed. The composition uses peroxide as oxidizing agent for PVD TiN hard mask removal under slightly basic conditions. The composition comprises bulky or long chain organic amines or polyalkylamine to improve removal/etching selectivity of PVD TiN vs CVD TiN. The composition further comprises long chain organic acids or amines to maintain Co compatibility.
    Type: Application
    Filed: April 26, 2016
    Publication date: April 20, 2017
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Wen Dar Liu, Yi-Chia Lee, William Jack Casteel, JR., Tianniu Chen, Rajiv Krishan Agarwal, Madhukar Bhaskara Rao
  • Patent number: 9536730
    Abstract: A composition and method for removing copper-containing post-etch and/or post-ash residue from patterned microelectronic devices is described. The removal composition includes water, a water-miscible organic solvent, an amine compound, an organic acid, and a fluoride ion source. The compositions effectively remove the copper-containing post-etch residue from the microelectronic device without damaging exposed low-k dielectric and metal interconnect materials.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: January 3, 2017
    Assignee: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Yi Chia Lee, Madhukar Bhaskara Rao, Gautam Banerjee, Wen Dar Liu, Aiping Wu, Seiji Inaoka
  • Patent number: 9472420
    Abstract: Aqueous compositions for stripping titanium nitride (TiN or TiNxOy) hard mask and removing etch residue are low pH aqueous composition comprising solvent, a weakly coordinating anion, amine, and at least two non-oxidizing trace metal ions. The aqueous compositions contain no non-ambient oxidizer, and are exposed to air. Bifluoride, or metal corrosion inhibitor may be added to the aqueous composition. Systems and processes use the aqueous compositions for stripping titanium nitride (TiN or TiNxOy) hard mask and removing titanium nitride (TiN or TiNxOy) etch residue.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: October 18, 2016
    Assignee: Air Products and Chemicals, Inc.
    Inventors: William Jack Casteel, Jr., Seiji Inaoka, Madhukar Bhaskara Rao, Brenda Faye Ross, Yi-Chia Lee, Wen Dar Liu, Tianniu Chen
  • Publication number: 20160225616
    Abstract: Described herein is an apparatus comprising a plurality of silicon-containing layers wherein the silicon-containing layers are selected from a silicon oxide and a silicon nitride layer or film. Also described herein are methods for forming the apparatus to be used, for example, as 3D vertical NAND flash memory stacks. In one particular aspect or the apparatus, the silicon oxide layer comprises slightly compressive stress and good thermal stability. In this or other aspects of the apparatus, the silicon nitride layer comprises slightly tensile stress and less than 300 MPa stress change after up to about 800° C. thermal treatment. In this or other aspects of the apparatus, the silicon nitride layer etches much faster than the silicon oxide layer in hot H3PO4, showing good etch selectivity.
    Type: Application
    Filed: September 30, 2015
    Publication date: August 4, 2016
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Jianheng Li, Robert Gordon Ridgeway, Xinjian Lei, Raymond Nicholas Vrtis, Bing Han, Madhukar Bhaskara Rao
  • Publication number: 20160152930
    Abstract: Stripping and cleaning compositions suitable for the removal of film resists include about 2-55% by weight of at least one alkanolamine or at least one morpholine or mixtures thereof; about 20-94% by weight of at least one organic solvent; and about 0.5-60% by weight water based on the total weight of the composition.
    Type: Application
    Filed: February 8, 2016
    Publication date: June 2, 2016
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Matthew I. Egbe, Aiping Wu, Madhukar Bhaskara Rao
  • Patent number: 9328318
    Abstract: A solution for semiconductor wafer dicing is disclosed. The solution suppresses the adherence of contamination residues or particles, and reduces or eliminates the corrosion of the exposed metallization areas, during the process of dicing a wafer by sawing. The solution comprises at least one organic acid and/or salt thereof; at least a surfactant and/or at least a base; and deionized water, the composition has a pH is equal or greater than 4. The solution can further comprise, a chelating agent, a defoaming agent, or a dispersing agent.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: May 3, 2016
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Dnyanesh Chandrakant Tamboli, Rajkumar Ramamurthi, David Barry Rennie, Madhukar Bhaskara Rao, Gautam Banerjee, Gene Everad Parris
  • Patent number: 9201308
    Abstract: The present invention relates to water-rich formulations and the method using same, to remove bulk photoresists, post-etched and post-ashed residues, residues from Al back-end-of-the-line interconnect structures, as well as contaminations. The formulation comprises: hydroxylamine; corrosion inhibitor containing a mixture of alkyl dihydroxybenzene and hydroxyquinoline; an alkanolamine, a water-soluble solvent or the combination of the two; and at least 50% by weight of water.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: December 1, 2015
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Madhukar Bhaskara Rao, Gautam Banerjee, Thomas Michael Wieder, Yi-Chia Lee, Wen Dar Liu, Aiping Wu
  • Publication number: 20150175943
    Abstract: Aqueous compositions for stripping titanium nitride(TiN or TiNxOy) hard mask and removing etch residue are low pH aqueous composition comprising solvent, a weakly coordinating anion, amine, and at least two non-oxidizing trace metal ions. The aqueous compositions contain no non-ambient oxidizer, and are exposed to air. Bifluoride, or metal corrosion inhibitor may be added to the aqueous composition. Systems and processes use the aqueous compositions for stripping titanium nitride(TiN or TiNxOy) hard mask and removing titanium nitride(TiN or TiNxOy) etch residue.
    Type: Application
    Filed: November 19, 2014
    Publication date: June 25, 2015
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: William Jack Casteel, JR., Seiji Inaoka, Madhukar Bhaskara Rao, Brenda Faye Ross, Yi-Chia Lee, Wen Dar Liu, Tianniu Chen
  • Patent number: 8883701
    Abstract: A solution for semiconductor wafer dicing is disclosed. The solution suppresses the adherence of contamination residues or particles, and reduces or eliminates the corrosion of the exposed metallization areas, during the process of dicing a wafer by sawing. The solution comprises at least one organic acid and/or salt thereof; at least a surfactant and/or at least a base; and deionized water, the composition has a pH is equal or greater than 4. The solution can further comprise, a chelating agent, a defoaming agent, or a dispersing agent.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: November 11, 2014
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Dnyanesh Chandrakant Tamboli, Rajkumar Ramamurthi, David Barry Rennie, Madhukar Bhaskara Rao, Gautam Banerjee, Gene Everad Parris
  • Patent number: 8765653
    Abstract: The present invention is a method of cleaning to removal residue in semiconductor manufacturing processing, comprising contacting a surface to be cleaned with an aqueous formulation having a polymer selected from the group consisting of acrylamido-methyl-propane sulfonate) polymers, acrylic acid-2-acrylamido-2-methylpropane sulfonic acid copolymer and mixtures thereof and a quaternary ammonium hydroxide having greater than 4 carbon atoms or choline hydroxide with a non-acetylinic surfactant. The present invention is also a post-CMP cleaning formulation having the components set forth in the method above.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: July 1, 2014
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Dnyanesh Chandrakant Tamboli, Madhukar Bhaskara Rao, Gautam Banerjee, Keith Randolph Fabregas
  • Publication number: 20140170835
    Abstract: A solution for semiconductor wafer dicing is disclosed. The solution suppresses the adherence of contamination residues or particles, and reduces or eliminates the corrosion of the exposed metallization areas, during the process of dicing a wafer by sawing. The solution comprises at least one organic acid and/or salt thereof; at least a surfactant and/or at least a base; and deionized water, the composition has a pH is equal or greater than 4. The solution can further comprise, a chelating agent, a defoaming agent, or a dispersing agent.
    Type: Application
    Filed: March 3, 2014
    Publication date: June 19, 2014
    Applicant: AIR PRODUCTS AND CHEMICALS, INC.
    Inventors: Dnyanesh Chandrakant Tamboli, Rajkumar Ramamurthi, David Barry Rennie, Madhukar Bhaskara Rao, Gautam Banerjee, Gene Everad Parris
  • Publication number: 20140109931
    Abstract: A composition and method for removing copper-containing post-etch and/or post-ash residue from patterned microelectronic devices is described. The removal composition includes water, a water-miscible organic solvent, an amine compound, an organic acid, and a fluoride ion source. The compositions effectively remove the copper-containing post-etch residue from the microelectronic device without damaging exposed low-k dielectric and metal interconnect materials.
    Type: Application
    Filed: August 27, 2013
    Publication date: April 24, 2014
    Applicant: AIR PRODUCTS AND CHEMICALS INC.
    Inventors: Yi Chia Lee, Madhukar Bhaskara Rao, Gautam Banerjee, Wen Dar Liu, Aiping Wu, Seiji Inaoka
  • Publication number: 20140100151
    Abstract: Stripping and cleaning compositions suitable for the removal of film resists include about 2-55% by weight of at least one alkanolamine or at least one morpholine or mixtures thereof; about 20-94% by weight of at least one organic solvent; and about 0.5-60% by weight water based on the total weight of the composition.
    Type: Application
    Filed: October 1, 2013
    Publication date: April 10, 2014
    Applicant: AIR PRODUCTS AND CHEMICALS INC.
    Inventors: Matthew I. Egbe, Aiping Wu, Madhukar Bhaskara Rao
  • Patent number: 8580656
    Abstract: Adherence of contaminant residues or particles is suppressed, corrosion of exposed surfaces is substantially reduced or eliminated during the process of dicing a wafer by sawing. A fluoride-free aqueous composition comprising a dicarboxylic acid and/or salt thereof; a hydroxycarboxylic acid and/or salt thereof or amine group containing acid, a surfactant and deionized water is employed.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: November 12, 2013
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Terence Quintin Collier, Charles A. Lhota, David Barry Rennie, Rajkumar Ramamurthi, Madhukar Bhaskara Rao, Dnyanesh Chandrakant Tamboli