Patents by Inventor Ramanathan Srinivasan

Ramanathan Srinivasan 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: 7101800
    Abstract: The present invention provides a chemical-mechanical polishing slurry for use in removing a barrier layer during the fabrication of a damascene structure. The slurry according to the invention includes an agent that suppresses the rate at which an underlying silicon-containing dielectric layer is removed. In the presently most preferred embodiment of the invention, the agent that suppresses the rate at which an underlying silicon-containing dielectric layer is removed is L-lysine and/or L-arginine. The present invention also provides a method of suppressing the removal rate of an underlying silicon-containing dielectric layer during the chemical-mechanical polishing of a barrier layer in a damascene structure. The method according to the invention includes polishing the barrier layer with a slurry comprising an agent that suppresses the rate at which said underlying silicon-containing dielectric layer is removed.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: September 5, 2006
    Assignee: Ferro Corporation
    Inventors: Yie-Shein Her, Ramanathan Srinivasan, Suryadevara Babu, Suresh Ramarajan
  • Patent number: 7091164
    Abstract: A new slurry for shallow trench isolation (STI) processing in the chemical mechanical planarization (CMP) in microelectronic industry comprising an aqueous medium having an abrasive; and a compound which has a carboxylic group and an electrophilic functional group. The combination of ceria and/or titania with amino acids to obtain polishing selectivity's greater than 5:1. CMP is used for removing the excess oxide and planarizing the substrate and the trench. The silicon nitride acts as a stop layer, preventing the polishing of underlying silicon substrate.
    Type: Grant
    Filed: July 11, 2003
    Date of Patent: August 15, 2006
    Assignees: Eastman Kodak Company, Ferro Corporation, Clarkson University
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her
  • Publication number: 20040157454
    Abstract: The present invention provides a chemical-mechanical polishing slurry for use in removing a barrier layer during the fabrication of a damascene structure. The slurry according to the invention includes an agent that suppresses the rate at which an underlying silicon-containing dielectric layer is removed. In the presently most preferred embodiment of the invention, the agent that suppresses the rate at which an underlying silicon-containing dielectric layer is removed is L-lysine and/or L-arginine. The present invention also provides a method of suppressing the removal rate of an underlying silicon-containing dielectric layer during the chemical-mechanical polishing of a barrier layer in a damascene structure. The method according to the invention includes polishing the barrier layer with a slurry comprising an agent that suppresses the rate at which said underlying silicon-containing dielectric layer is removed.
    Type: Application
    Filed: December 30, 2003
    Publication date: August 12, 2004
    Applicant: Ferro Corporation
    Inventors: Yie-Shein Her, Ramanathan Srinivasan, Suryadevara Babu, Suresh Ramarajan
  • Publication number: 20040051077
    Abstract: A new slurry for shallow trench isolation (STI) processing in the chemical mechanical planarization (CMP) in microelectronic industry comprising an aqueous medium having an abrasive; and a compound which has a carboxylic group and an electrophilic functional group. The combination of ceria and/or titania with amino acids to obtain polishing selectivity's greater than 5:1. CMP is used for removing the excess oxide and planarizing the substrate and the trench. The silicon nitride acts as a stop layer, preventing the polishing of underlying silicon substrate.
    Type: Application
    Filed: July 11, 2003
    Publication date: March 18, 2004
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her
  • Patent number: 6702954
    Abstract: The present invention provides a chemical-mechanical polishing slurry for use in removing a barrier layer during the fabrication of a damascene structure. The slurry according to the invention includes an agent that suppresses the rate at which an underlying silicon-containing dielectric layer is removed. In the presently most preferred embodiment of the invention, the agent that suppresses the rate at which an underlying silicon-containing dielectric layer is removed is L-lysine and/or L-arginine. The present invention also provides a method of suppressing the removal rate of an underlying silicon-containing dielectric layer during the chemical-mechanical polishing of a barrier layer in a damascene structure. The method according to the invention includes polishing the barrier layer with a slurry comprising an agent that suppresses the rate at which said underlying silicon-containing dielectric layer is removed.
    Type: Grant
    Filed: October 19, 2000
    Date of Patent: March 9, 2004
    Assignee: Ferro Corporation
    Inventors: Yie-Shein Her, Ramanathan Srinivasan, Suryadevara Babu, Suresh Ramarajan
  • Patent number: 6627107
    Abstract: A new slurry for shallow trench isolation (STI) processing in the chemical mechanical planarization (CMP) in microelectronic industry comprising an aqueous medium having an abrasive; and a compound which has a carboxylic group and an electrophilic functional group. The combination of ceria and/or titania with amino acids to obtain polishing selectivity's greater than 5:1. CMP is used for removing the excess oxide and planarizing the substrate and the trench. The silicon nitride acts as a stop layer, preventing the polishing of underlying silicon substrate.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: September 30, 2003
    Assignee: Eastman Kodak Company
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her
  • Patent number: 6544892
    Abstract: The present invention relates to an aqueous slurry that is particularly useful for removing silicon dioxide in preference to silicon nitride by chemical-mechanical processing. The aqueous slurry according to the invention includes abrasive particles and an organic compound having both a carboxylic acid functional group and a second functional group selected from amines and halides. The present invention also relates to a method of removing silicon dioxide in preference to silicon nitride from a surface of an article by chemical-mechanical polishing. The method includes polishing the surface using a polishing pad, water, abrasive particles, and an organic compound having both a carboxylic acid functional group and a second functional group selected from amines and halides. The abrasive particles can be dispersed in the aqueous medium or they can be bonded to the polishing pad.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: April 8, 2003
    Assignee: Eastman Kodak Company
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her
  • Publication number: 20030006397
    Abstract: A new slurry for shallow trench isolation (STI) processing in the chemical mechanical planarization (CMP) in microelectronic industry comprising an aqueous medium having an abrasive; and a compound which has a carboxylic group and an electrophilic functional group. The combination of ceria and/or titania with amino acids to obtain polishing selectivity's greater than 5:1. CMP is used for removing the excess oxide and planarizing the substrate and the trench. The silicon nitride acts as a stop layer, preventing the polishing of underlying silicon substrate.
    Type: Application
    Filed: July 10, 2002
    Publication date: January 9, 2003
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her
  • Publication number: 20020195421
    Abstract: The present invention relates to an aqueous slurry that is particularly useful for removing silicon dioxide in preference to silicon nitride by chemical-mechanical processing. The aqueous slurry according to the invention includes abrasive particles and an organic compound having both a carboxylic acid functional group and a second functional group selected from amines and halides. The present invention also relates to a method of removing silicon dioxide in preference to silicon nitride from a surface of an article by chemical-mechanical polishing. The method includes polishing the surface using a polishing pad, water, abrasive particles, and an organic compound having both a carboxylic acid functional group and a second functional group selected from amines and halides. The abrasive particles can be dispersed in the aqueous medium or they can be bonded to the polishing pad.
    Type: Application
    Filed: July 10, 2002
    Publication date: December 26, 2002
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her
  • Patent number: 6491843
    Abstract: The present invention relates to an aqueous slurry that is particularly useful for removing silicon dioxide in preference to silicon nitride by chemical-mechanical processing. The aqueous slurry according to the invention includes abrasive particles and an organic compound having both a carboxylic acid functional group and a second functional group selected from amines and halides. The present invention also relates to a method of removing silicon dioxide in preference to silicon nitride from a surface of an article by chemical-mechanical polishing. The method includes polishing the surface using a polishing pad, water, abrasive particles, and an organic compound having both a carboxylic acid functional group and a second functional group selected from amines and halides. The abrasive particles can be dispersed in the aqueous medium or they can be bonded to the polishing pad.
    Type: Grant
    Filed: March 15, 2000
    Date of Patent: December 10, 2002
    Assignees: Eastman Kodak Company, Clarkson University, Ferro Corporation
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her
  • Patent number: 6468910
    Abstract: A new slurry for shallow trench isolation (STI) processing in the chemical mechanical planarization (CMP) in microelectronic industry comprising an aqueous medium having an abrasive; and a compound which has a carboxylic group and an electrophilic functional group. The combination of ceria and/or titania with amino acids to obtain polishing selectivity's greater than 5:1. CMP is used for removing the excess oxide and planarizing the substrate and the trench. The silicon nitride acts as a stop layer, preventing the polishing of underlying silicon substrate.
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: October 22, 2002
    Inventors: Ramanathan Srinivasan, Suryadevara V. Babu, William G. America, Yie-Shein Her