Patents by Inventor KEEWOUNG CHOI

KEEWOUNG CHOI 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: 11201155
    Abstract: The instant disclosure discloses a semiconductor device comprising a substrate having a cell region; a device layer over the substrate; a plurality of capacitor lower electrodes over the device layer in the cell region, each of the capacitor lower electrodes has a U-shaped profile defining an inner surface in a cross section; a capacitor dielectric liner on the inner surfaces of the capacitor lower electrodes; and a SiGe layer over the capacitor dielectric liner, wherein the SiGe layer has a Ge concentration distribution that has a greatest value at a middle portion of the SiGe layer and decreases there-from upwardly and downwardly along a thickness direction.
    Type: Grant
    Filed: November 11, 2019
    Date of Patent: December 14, 2021
    Assignee: XIA TAI XIN SEMICONDUCTOR (QING DAO) LTD.
    Inventors: Sang-Woo Lee, Keewoung Choi, Sung-Ki Kim
  • Patent number: 11049766
    Abstract: A semiconductor structure is disclosed. The semiconductor structure includes a base layer and an etch stop layer having a plurality of elements and in physical contact with the base layer. The etch stop layer have a Boron (B) element configured to improve the etch profile of the etch stop layer.
    Type: Grant
    Filed: November 11, 2019
    Date of Patent: June 29, 2021
    Assignee: XIA TAI XIN SEMICONDUCTOR (QING DAO) LTD.
    Inventors: Sang-Woo Lee, Keewoung Choi, Sung-Ki Kim
  • Patent number: 11037931
    Abstract: The instant disclosure discloses method comprising receiving a substrate; disposing a dielectric layer over the substrate; disposing a metallic material on the dielectric layer; disposing a passivation layer on top surface of the metallic material; and performing an alloy layer formation process to dispose a SiGe layer across top surface of the passivation layer.
    Type: Grant
    Filed: November 11, 2019
    Date of Patent: June 15, 2021
    Assignee: XIA TAI XIN SEMICONDUCTOR (QING DAO) LTD.
    Inventors: Keewoung Choi, Hasung Lee, Sung-Ki Kim
  • Patent number: 10923311
    Abstract: An apparatus for ion implantation is disclosed. The apparatus comprising an arc chamber and an electron source device. The electron source device includes a cathode and a filament. The filament is disposed within the cathode. The cathode has a body and a cap disposed over the body. The cap has a receiving surface and a emitting surface opposite the receiving surface. The emitting surface has a convex shape facing the receiving area of the arc chamber and the receiving surface has a conical shape where a center area is a flat surface and the center area being surrounded by a tapered sidewall.
    Type: Grant
    Filed: November 11, 2019
    Date of Patent: February 16, 2021
    Assignee: XIA TAI XIN SEMICONDUCTOR (QING DAO) LTD.
    Inventors: Keewoung Choi, Jong-Moo Choi, Heung-Woo Park, Hasung Lee
  • Publication number: 20200219764
    Abstract: A semiconductor structure is disclosed. The semiconductor structure includes a base layer and an etch stop layer having a plurality of elements and in physical contact with the base layer. The etch stop layer have a Boron (B) element configured to improve the etch profile of the etch stop layer.
    Type: Application
    Filed: November 11, 2019
    Publication date: July 9, 2020
    Inventors: SANG-WOO LEE, KEEWOUNG CHOI, SUNG-KI KIM
  • Publication number: 20200219881
    Abstract: The instant disclosure discloses a semiconductor device comprising a substrate having a cell region; a device layer over the substrate; a plurality of capacitor lower electrodes over the device layer in the cell region, each of the capacitor lower electrodes has a U-shaped profile defining an inner surface in a cross section; a capacitor dielectric liner on the inner surfaces of the capacitor lower electrodes; and a SiGe layer over the capacitor dielectric liner, wherein the SiGe layer has a Ge concentration distribution that has a greatest value at a middle portion of the SiGe layer and decreases there-from upwardly and downwardly along a thickness direction.
    Type: Application
    Filed: November 11, 2019
    Publication date: July 9, 2020
    Inventors: SANG-WOO LEE, KEEWOUNG CHOI, SUNG-KI KIM
  • Publication number: 20200219887
    Abstract: The instant disclosure discloses method comprising receiving a substrate; disposing a dielectric layer over the substrate; disposing a metallic material on the dielectric layer; disposing a passivation layer on top surface of the metallic material; and performing an alloy layer formation process to dispose a SiGe layer across top surface of the passivation layer.
    Type: Application
    Filed: November 11, 2019
    Publication date: July 9, 2020
    Inventors: KEEWOUNG CHOI, HASUNG LEE, SUNG-KI KIM
  • Publication number: 20200203179
    Abstract: A method for manufacturing a semiconductor component includes the following steps: performing polysilicon deposition on a surface of a semiconductor substrate to form a deposited layer; performing a chemical mechanical polishing on the deposited layer; performing a hydrogen implantation treatment or a hydrogen plasma treatment on the deposited layer; and performing an annealing process on the deposited layer at an annealing temperature of 600 degrees Celsius to 900 degrees Celsius to form a polysilicon contact layer.
    Type: Application
    Filed: December 19, 2019
    Publication date: June 25, 2020
    Inventors: KEEWOUNG CHOI, HASUNG LEE, SUNG-KI KIM