Patents by Inventor Purakh Verma

Purakh Verma 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: 20050009357
    Abstract: A first method of reducing semiconductor device substrate effects comprising the following steps. O+or O2+are selectively implanted into a silicon substrate to form a silicon-damaged silicon oxide region. One or more devices are formed over the silicon substrate proximate the silicon-damaged silicon oxide region within at least one upper dielectric layer. A passivation layer is formed over the at least one upper dielectric layer. The passivation layer and the at least one upper dielectric layer are patterned to form a trench exposing a portion of the silicon substrate over the silicon-damaged silicon oxide region. The silicon-damaged silicon oxide region is selectively etched to form a channel continuous and contiguous with the trench whereby the channel reduces the substrate effects of the one or more semiconductor devices.
    Type: Application
    Filed: August 2, 2004
    Publication date: January 13, 2005
    Inventors: Lap Chan, Sanford Chu, Chit Ng, Purakh Verma, Jia Zheng, Johnny Chew, Choon Sia
  • Patent number: 6821904
    Abstract: In accordance with the objectives of the invention a new method is provided for the creation of layers of gate oxide having an unequal thickness. Active surface regions are defined over the surface of a substrate, a thick layer of gate oxide is grown over the active surface. A selective etch is applied to the thick layer of gate oxide, selectively reducing the thickness of the thick layer of gate oxide to the required thickness of a thin layer of gate oxide. The layer of thick gate oxide is blocked from exposure. N2 atoms are implanted into the exposed surface of the thin layer of oxide, rapid thermal processing is performed and the blocking mask is removed from the surface of the thick layer of gate oxide. A high concentration of nitride has now been provided in the thin layer of gate oxide.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: November 23, 2004
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Yelehanka Ramachandramurthy Pradeep, Sanford Chu, Chit Hwei Ng, Jia Zhen Zheng, Purakh Verma
  • Publication number: 20040217440
    Abstract: A method is described to fabricate RF inductor devices on a silicon substrate. Low-k or other dielectric material is deposited and patterned to form inductor lower plate trenches. Trenches are lined with barrier film such as TaN, filled with copper, and excess metal planarized using chemical mechanical polishing (CMP). Second layer of a dielectric material is deposited and patterned to form via-hole/trenches. Via-hole/trench patterns are filled with barrier material, and the dielectric film in between the via-hole/trenches is etched to form a second set of trenches. These trenches are filled with copper and planarized. A third layer of a dielectric film is deposited and patterned to form via-hole/trenches. Via-hole/trenches are then filled with barrier material, and the dielectric film between via-hole/trench patterns etched to form a third set of trenches. These trenches are filled with copper metal and excess metal removed by CMP to form said RF inductor.
    Type: Application
    Filed: May 1, 2003
    Publication date: November 4, 2004
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Chit Hwei Ng, Lap Chan, Purakh Verma, Yelehanka Ramachandramurthy Pradeep, Sanford Chu
  • Publication number: 20040038542
    Abstract: A first method of reducing semiconductor device substrate effects comprising the following steps. O+ or O2+ are selectively implanted into a silicon substrate to form a silicon-damaged silicon oxide region. One or more devices are formed over the silicon substrate proximate the silicon-damaged silicon oxide region within at least one upper dielectric layer. A passivation layer is formed over the at least one upper dielectric layer. The passivation layer and the at least one upper dielectric layer are patterned to form a trench exposing a portion of the silicon substrate over the silicon-damaged silicon oxide region. The silicon-damaged silicon oxide region is selectively etched to form a channel continuous and contiguous with the trench whereby the channel reduces the substrate effects of the one or more semiconductor devices.
    Type: Application
    Filed: August 22, 2002
    Publication date: February 26, 2004
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Lap Chan, Sanford Chu, Chit Hwei Ng, Purakh Verma, Jia Zhen Zheng, Johnny Chew, Choon Beng Sia
  • Publication number: 20040023506
    Abstract: In accordance with the objectives of the invention a new method is provided for the creation of layers of gate oxide having an unequal thickness. Active surface regions are defined over the surface of a substrate, a thick layer of gate oxide is grown over the active surface. A selective etch is applied to the thick layer of gate oxide, selectively reducing the thickness of the thick layer of gate oxide to the required thickness of a thin layer of gate oxide. The layer of thick gate oxide is blocked from exposure. N2 atoms are implanted into the exposed surface of the thin layer of oxide, rapid thermal processing is performed and the blocking mask is removed from the surface of the thick layer of gate oxide. A high concentration of nitride has now been provided in the thin layer of gate oxide.
    Type: Application
    Filed: July 30, 2002
    Publication date: February 5, 2004
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Yelehanka Ramachandramurthy Pradeep, Sanford Chu, Chit Hwei Ng, Jia Zhen Zheng, Purakh Verma
  • Publication number: 20040004054
    Abstract: A new method of provided for forming in one plane layers of semiconductor material having both high and low dielectric constants. Layers, having selected and preferably non-identical parameters of dielectric constants, are successively deposited interspersed with layers of etch stop material. The layers can be etched, creating openings there-through that can be filled with a a layer of choice.
    Type: Application
    Filed: July 5, 2002
    Publication date: January 8, 2004
    Applicant: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Yelehanka Ramachandramurthy Pradeep, Sanford Chu, Chit Hwei Ng, Jia Zhen Zheng, Purakh Verma