Patents by Inventor Gurtej Sandhu Sandhu

Gurtej Sandhu Sandhu 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: 7276442
    Abstract: A method for depositing metal on a semiconductor device having a substrate, an exposed first surface, and an exposed second surface is provided. Metal ions are deposited on the exposed first surface and on the exposed second layer by applying a first voltage between the substrate and an anode in the presence of an electrolytic bath, and metal ions are removed from the exposed first surface by applying a second voltage between the substrate and the anode in the presence of the electrolytic bath. Other aspects and embodiments are provided herein.
    Type: Grant
    Filed: April 8, 2004
    Date of Patent: October 2, 2007
    Assignee: Micron Technology, Inc.
    Inventors: Gurtej Sandhu Sandhu, Chris Chang Yu
  • Publication number: 20040192003
    Abstract: A method for depositing metal on a semiconductor device having a substrate, an exposed first surface, and an exposed second surface is provided. Metal ions are deposited on the exposed first surface and on the exposed second layer by applying a first voltage between the substrate and an anode in the presence of an electrolytic bath, and metal ions are removed from the exposed first surface by applying a second voltage between the substrate and the anode in the presence of the electrolytic bath. Other aspects and embodiments are provided herein.
    Type: Application
    Filed: April 8, 2004
    Publication date: September 30, 2004
    Applicant: Micron Technology, Inc.
    Inventors: Gurtej Sandhu Sandhu, Chris Chang Yu
  • Publication number: 20020195709
    Abstract: A method for forming a metallization layer. A first layer is formed outwardly from a semiconductor substrate. Contact vias are formed through the first layer to the semiconductor substrate. A second layer is formed outwardly from the first layer. Portions of the second layer are selectively removed such that the remaining portion of the second layer defines the layout of the metallization layer and the contact vias. The first and second layers are electroplated by applying a bi-polar modulated voltage having a positive duty cycle and a negative duty cycle to the layers in a solution containing metal ions. The voltage and surface potentials are selected such that the metal ions are deposited on the remaining portions of the second layer. Further, metal ions deposited on the first layer during a positive duty cycle are removed from the first layer during a negative duty cycle. Finally, exposed portions of the first layer are selectively removed.
    Type: Application
    Filed: August 13, 2002
    Publication date: December 26, 2002
    Applicant: Micron Technology, Inc.
    Inventors: Gurtej Sandhu Sandhu, Chris Chang Yu
  • Patent number: 6171952
    Abstract: A method for forming a metallization layer (30). A first layer (14) is formed outwardly from a semiconductor substrate (10). Contact vias (16) are formed through the first layer (14) to the semiconductor substrate (10). A second layer (20) is formed outwardly from the first layer (14). Portions of the second layer (20) are selectively removed such that the remaining portion of the second layer (20) defines the layout of the metallization layer (30) and the contact vias (16). The first and second layers (14) and (20) are electroplated by applying a bi-polar modulated voltage having a positive duty cycle and a negative duty cycle to the layers in a solution containing metal ions. The voltage and surface potentials are selected such that the metal ions are deposited on the remaining portions of the second layer (20). Further, metal ions deposited on the first layer (14) during a positive duty cycle are removed from the first layer (14) during a negative duty cycle.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: January 9, 2001
    Assignee: Micron Technology, Inc.
    Inventors: Gurtej Sandhu Sandhu, Chris Chang Yu
  • Patent number: 5662788
    Abstract: A method for forming a metallization layer (30). A first layer (14) is formed outwardly from a semiconductor substrate (10). Contact vias (16) are formed through the first layer (14) to the semiconductor substrate (10). A second layer (20) is formed outwardly from the first layer (14). Portions of the second layer (20) are selectively removed such that the remaining portion of the second layer (20) defines the layout of the metallization layer (30) and the contact vias (16). The first and second layers (14) and (20) are electroplated by applying a bi-polar modulated voltage having a positive duty cycle and a negative duty cycle to the layers in a solution containing metal ions. The voltage and surface potentials are selected such that the metal ions are deposited on the remaining portions of the second layer (20). Further, metal ions deposited on the first layer (14) during a positive duty cycle are removed from the first layer (14) during a negative duty cycle.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: September 2, 1997
    Assignee: Micron Technology, Inc.
    Inventors: Gurtej Sandhu Sandhu, Chris Chang Yu