Patents by Inventor Subhash B. Kulkarni

Subhash B. Kulkarni 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).

  • Publication number: 20080190446
    Abstract: A “wafer-less” etch chamber cleaning method varies the capacitance applied to radio frequency components of the chuck that is within the etch chamber (varies impedance of the chuck) so as to cause electric field lines within the etch chamber to terminate (bend) away from the chuck. Then the etch chamber can be cleaned using a very aggressive etch chemistry (e.g., NF3) that would otherwise damage the chuck; however, the electric field lines protect the chuck from the etch chemistry. The capacitance is varied according to a pre-established model. Further, the process evaluates the effectiveness of the pre-established model to produce feedback and constantly adjusts the pre-established model to increase the effectiveness of the cleaning process (according to the feedback).
    Type: Application
    Filed: February 13, 2007
    Publication date: August 14, 2008
    Inventors: Rajiv M. Ranade, Subhash B. Kulkarni, Ole Krogh, Sukesh Patel
  • Patent number: 7144769
    Abstract: A method of forming at least one deep trench structure having an increased trench depth is provided. The method includes providing at least one deep trench having sidewalls that extend to a common bottom wall in a surface of a substrate. Each deep trench has initial dimensions that are wider than targeted dimensions for the deep trenches. To reduce the initial dimensions to that of the targeted dimensions, an epitaxial silicon film is formed selectively or non-selectively on at least some portions of the sidewalls using a low-temperature ultra-high vacuum epitaxial silicon growth tehnique.
    Type: Grant
    Filed: July 27, 2004
    Date of Patent: December 5, 2006
    Assignee: International Business Machines Corporation
    Inventors: Kevin K. Chan, Subhash B. Kulkarni, Gangadhara S. Mathad, Rajiv M. Ranade
  • Patent number: 6821864
    Abstract: A method of forming at least one deep trench structure having an increased trench depth is provided. The method includes providing at least one deep trench having sidewalls that extend to a common bottom wall in a surface of a substrate. Each deep trench has initial dimensions that are wider than targeted dimensions for the deep trenches. To reduce the initial dimensions to that of the targeted dimensions, an epitaxial silicon film is formed selectively or non-selectively on at least some portions of the sidewalls using a low-temperature ultra-high vacuum epitaxial silicon growth tehnique.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: November 23, 2004
    Assignee: International Business Machines Corporation
    Inventors: Kevin K. Chan, Subhash B. Kulkarni, Gangadhara S. Mathad, Rajiv M. Ranade
  • Patent number: 6809005
    Abstract: The present invention provides methods of producing trench structures having substantially void-free filler material therein. The fillers may be grown from a liner material such as polysilicon formed along the sidewalls of the trench. Previously formed voids may be healed by exposing the voids and growing epitaxial silicon.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: October 26, 2004
    Assignees: Infineon Technologies AG, International Business Machines Corporation
    Inventors: Rajiv Ranade, Gangadhara S. Mathad, Kevin K. Chan, Subhash B. Kulkarni
  • Publication number: 20040180510
    Abstract: The present invention provides methods of producing trench structures having substantially void-free filler materials therein. The fillers may be grown from a liner material such as polysilicon formed along the sidewalls of the trench. Previously formed voids may be healed by exposing the voids and growing epitaxial silicon.
    Type: Application
    Filed: March 12, 2003
    Publication date: September 16, 2004
    Applicants: Infineon Technologies North America Corp., International Business Machines Corporation
    Inventors: Rajiv Ranade, Gangadhara S. Mathad, Kevin K. Chan, Subhash B. Kulkarni
  • Publication number: 20030170951
    Abstract: A method of forming at least one deep trench structure having an increased trench depth is provided. The method includes providing at least one deep trench having sidewalls that extend to a common bottom wall in a surface of a substrate. Each deep trench has initial dimensions that are wider than targeted dimensions for the deep trenches. To reduce the initial dimensions to that of the targeted dimensions, an epitaxial silicon film is formed selectively or non-selectively on at least some portions of the sidewalls using a low-temperature ultra-high vacuum epitaxial silicon growth tehnique.
    Type: Application
    Filed: March 7, 2002
    Publication date: September 11, 2003
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kevin K. Chan, Subhash B. Kulkarni, Gangadhara S. Mathad, Rajiv M. Ranade
  • Patent number: 6563173
    Abstract: An SOI chip having an isolation barrier. The SOI chip includes a substrate, an oxide layer deposited on the substrate, and a silicon layer deposited on the oxide layer. A gate is deposited above the silicon layer. A first metal contact is deposited above the gate to form an electrical contact with the gate. Second and third metal contacts are deposited to form electrical contacts with the silicon layer. The isolation barrier extends through the silicon layer and the oxide layer, and partially into the substrate, to block impurities in the oxide layer outside the isolation barrier from diffusing into the oxide layer inside the isolation barrier. The isolation barrier surrounds the gate, the first metal contact, the second metal contact, and the third metal contact—which define an active chip area inside the isolation barrier. A method of manufacturing the SOI chip is also disclosed.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: May 13, 2003
    Assignee: International Business Machines Corporation
    Inventors: Ronald J. Bolam, Subhash B. Kulkarni, Dominic J. Schepis
  • Patent number: 6492684
    Abstract: An SOI chip having an isolation barrier. The SOI chip includes a substrate, an oxide layer deposited on the substrate, and a silicon layer deposited on the oxide layer. A gate is deposited above the silicon layer. A first metal contact is deposited above the gate to form an electrical contact with the gate. Second and third metal contacts are deposited to form electrical contacts with the silicon layer. The isolation barrier extends through the silicon layer and the oxide layer, and partially into the substrate, to block impurities in the oxide layer outside the isolation barrier from diffusing into the oxide layer inside the isolation barrier. The isolation barrier surrounds the gate, the first metal contact, the second metal contact, and the third metal contact—which define an active chip area inside the isolation barrier. A method of manufacturing the SOI chip is also disclosed.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: December 10, 2002
    Assignee: International Business Machines Corporation
    Inventors: Ronald J. Bolam, Subhash B. Kulkarni, Dominic J. Schepis
  • Publication number: 20020043686
    Abstract: An SOI chip having an isolation barrier. The SOI chip includes a substrate, an oxide layer deposited on the substrate, and a silicon layer deposited on the oxide layer. A gate is deposited above the silicon layer. A first metal contact is deposited above the gate to form an electrical contact with the gate. Second and third metal contacts are deposited to form electrical contacts with the silicon layer. The isolation barrier extends through the silicon layer and the oxide layer, and partially into the substrate, to block impurities in the oxide layer outside the isolation barrier from diffusing into the oxide layer inside the isolation barrier. The isolation barrier surrounds the gate, the first metal contact, the second metal contact, and the third metal contact—which define an active chip area inside the isolation barrier. A method of manufacturing the SOI chip is also disclosed.
    Type: Application
    Filed: June 11, 2001
    Publication date: April 18, 2002
    Inventors: Ronald J. Bolam, Subhash B. Kulkarni, Dominic J. Schepis
  • Publication number: 20010024863
    Abstract: An SOI chip having an isolation barrier. The SOI chip includes a substrate, an oxide layer deposited on the substrate, and a silicon layer deposited on the oxide layer. A gate is deposited above the silicon layer. A first metal contact is deposited above the gate to form an electrical contact with the gate. Second and third metal contacts are deposited to form electrical contacts with the silicon layer. The isolation barrier extends through the silicon layer and the oxide layer, and partially into the substrate, to block impurities in the oxide layer outside the isolation barrier from diffusing into the oxide layer inside the isolation barrier. The isolation barrier surrounds the gate, the first metal contact, the second metal contact, and the third metal contact—which define an active chip area inside the isolation barrier. A method of manufacturing the SOI chip is also disclosed.
    Type: Application
    Filed: May 16, 2001
    Publication date: September 27, 2001
    Inventors: Ronald J. Bolam, Subhash B. Kulkarni, Dominic J. Schepis
  • Patent number: 6281095
    Abstract: An SOI chip having an isolation barrier. The SOI chip includes a substrate, an oxide layer deposited on the substrate, and a silicon layer deposited on the oxide layer. A gate is deposited above the silicon layer. A first metal contact is deposited above the gate to form an electrical contact with the gate. Second and third metal contacts are deposited to form electrical contacts with the silicon layer. The isolation barrier extends through the silicon layer and the oxide layer, and partially into the substrate, to block impurities in the oxide layer outside the isolation barrier from diffusing into the oxide layer inside the isolation barrier. The isolation barrier surrounds the gate, the first metal contact, the second metal contact, and the third metal contact—which define an active chip area inside the isolation barrier. A method of manufacturing the SOI chip is also disclosed.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: August 28, 2001
    Assignee: International Business Machines Corporation
    Inventors: Ronald J. Bolam, Subhash B. Kulkarni, Dominic J. Schepis
  • Patent number: 6133610
    Abstract: An SOI chip having an isolation barrier. The SOI chip includes a substrate, an oxide layer deposited on the substrate, and a silicon layer deposited on the oxide layer. A gate is deposited above the silicon layer. A first metal contact is deposited above the gate to form an electrical contact with the gate. Second and third metal contacts are deposited to form electrical contacts with the silicon layer. The isolation barrier extends through the silicon layer and the oxide layer, and partially into the substrate, to block impurities in the oxide layer outside the isolation barrier from diffusing into the oxide layer inside the isolation barrier. The isolation barrier surrounds the gate, the first metal contact, the second metal contact, and the third metal contact--which define an active chip area inside the isolation barrier. A method of manufacturing the SOI chip is also disclosed.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: October 17, 2000
    Assignee: International Business Machines Corporation
    Inventors: Ronald J. Bolam, Subhash B. Kulkarni, Dominic J. Schepis
  • Patent number: 5562770
    Abstract: The present invention provides a method of global stress modification which results in reducing number of dislocations in an epitaxially grown semiconducting device layer on a semiconductor substrate where the device layer and the substrate have a lattice mismatch. The invention teaches a method of imparting a convex curvature to the substrate by removing layer(s) of thin film from or adding layers of thin film to the back side of the substrate, so as to achieve a reduced dislocation density in the device layer.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: October 8, 1996
    Assignee: International Business Machines Corporation
    Inventors: Bomy A. Chen, Terence B. Hook, Subhash B. Kulkarni
  • Patent number: 4504330
    Abstract: A reduced pressure epitaxial deposition method is disclosed to maximize performance and leakage limited yield of devices formed in the epitaxial layer. The method includes specified prebake and deposition conditions designed to minimize arsenic (buried subcollector) and boron (buried isolation) autodoping effects when pressures below one atmosphere are selected in accordance with the subcollector-to-isolation area ratio.
    Type: Grant
    Filed: October 19, 1983
    Date of Patent: March 12, 1985
    Assignee: International Business Machines Corporation
    Inventors: Arun K. Gaind, Subhash B. Kulkarni, Michael R. Poponiak