Patents by Inventor Yujun Li

Yujun Li 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: 20020149063
    Abstract: An N-channel metal oxide semiconductor (NMOS) driver circuit (and method for making the same), includes a boost gate stack formed on a substrate and having a source and drain formed by a low concentration implantation, and an N-driver coupled to the boost gate stack.
    Type: Application
    Filed: May 28, 2002
    Publication date: October 17, 2002
    Inventors: Lawrence A. Clevenger, Rama Divakarumi, Louis Lu-Chen Hsu, Yujun Li
  • Patent number: 6444548
    Abstract: A integrated circuit device and method for manufacturing an integrated circuit device includes forming a patterned gate stack, adjacent a storage device, to include a storage node diffusion region adjacent the storage device and a bitline contact diffusion region opposite the storage node diffusion region, implanting an impurity in the storage node diffusion region and the bitline contact diffusion region, forming an insulator layer over the patterned gate stack, removing a portion of the insulator layer from the bitline contact diffusion region to form sidewall spacers along a portion of the patterned gate stack adjacent the bitline contact diffusion region, implanting a halo implant into the bitline contact diffusion region, wherein the insulator layer is free from blocking the halo implant from the second diffusion region and annealing the integrated circuit device to drive the halo implant ahead of the impurity.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: September 3, 2002
    Assignee: International Business Machines Corporation
    Inventors: Ramachandra Divakaruni, Yujun Li, Jack A. Mandelman
  • Patent number: 6433397
    Abstract: An N-channel metal oxide semiconductor (NMOS) driver circuit (and method for making the same), includes a boost gate stack formed on a substrate and having a source and drain formed by a low concentration N-type implantation, and an N-driver coupled to the boost gate stack.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: August 13, 2002
    Assignee: International Business Machines Corporation
    Inventors: Lawrence A. Clevenger, Rama Divakaruni, Louis Lu-Chen Hsu, Yujun Li
  • Publication number: 20020100904
    Abstract: A dual work function semiconductor structure with borderless contact and method of fabricating the same are presented. The structure may include a field effect transistor (FET) having a substantially cap-free gate and a conductive contact to a diffusion adjacent to the cap-free gate, wherein the conductive contact is borderless to the gate. Because the structure is a dual work function structure, the conductive contact is allowed to extend over the cap-free gate without being electrically connected thereto.
    Type: Application
    Filed: January 30, 2001
    Publication date: August 1, 2002
    Applicant: International Business Machines Corporation
    Inventors: Qiuyi Ye, William R. Tonti, Yujun Li
  • Publication number: 20020089020
    Abstract: An N-channel metal oxide semiconductor (NMOS) driver circuit (and method for making the same), includes a boost gate stack formed on a substrate and having a source and drain formed by a low concentration N-type implantation, and an N-driver coupled to the boost gate stack.
    Type: Application
    Filed: January 21, 2000
    Publication date: July 11, 2002
    Inventors: Lawrence A. Clevenger, Rama Divakarumi, Louis Lu-Chen Hsu, Yujun Li
  • Patent number: 6387782
    Abstract: A process for forming an ultra-shallow junction depth, doped region within a silicon substrate. The process includes forming a dielectric film on the substrate, then implanting an ionic dopant species into the structure. The profile of the implanted species includes a population implanted through the dielectric film and into the silicon substrate, and a peak concentration deliberately confined in the dielectric film in close proximity to the interface between the dielectric film and the silicon substrate. A high-energy, low-dosage implant process is used and produces a structure that is substantially free of dislocation loops and other defect clusters. An annealing process is used to drive the peak concentration closer to the interface, and some of the population of the originally implanted species from the dielectric film into the silicon substrate.
    Type: Grant
    Filed: June 6, 2001
    Date of Patent: May 14, 2002
    Assignees: International Business Machines Corporation, Infineon Technologies North America Corp.
    Inventors: Hiroyuki Akatsu, Omer H. Dokumaci, Suryanarayan G. Hegde, Yujun Li, Rajesh Rengarajan, Paul A. Ronsheim
  • Patent number: 6348394
    Abstract: A semiconductor device and method of manufacturing thereof are provided. A trench is formed in a semiconductor substrate. A thin oxide liner is preferably formed on surfaces of the trench. A nitride liner is formed in the trench. Charge is trapped in the nitride liner. In a preferred embodiment, the trench is filled with an oxide by an HDP process to increase the amount of charge trapped in the nitride liner. Preferably, the oxide fill is formed directly on the nitride liner.
    Type: Grant
    Filed: May 18, 2000
    Date of Patent: February 19, 2002
    Assignee: International Business Machines Corporation
    Inventors: Jack A. Mandelman, Rama Divakaruni, Herbert Ho, Giuseppe La Rosa, Yujun Li, Jochen Beintner, Radhika Srinivasan
  • Patent number: 6329271
    Abstract: A short channel insulated gate field effect transistor has within the semiconductor body that houses the transistor a buried layer of the same conductivity type as the body but of higher impurity concentration. The buried layer is below the channel region and essentially extends only the distance between the drain and source regions of the transistor. The process to form the device provides high concentration in the region under the gate to suppress lateral depletion region expansion, while keeping a gradual junction in the vertical direction.
    Type: Grant
    Filed: June 6, 2000
    Date of Patent: December 11, 2001
    Assignees: Infineon Technologies AG, International Business Machines Corporation
    Inventors: Hiroyuki Akatsu, Yujun Li, Jochen Beintner
  • Patent number: 6329704
    Abstract: A process for forming an ultra-shallow junction depth, doped region within a silicon substrate. The process includes forming a dielectric film on the substrate, then implanting an ionic dopant species into the structure. The profile of the implanted species includes a population implanted through the dielectric film and into the silicon substrate, and a peak concentration deliberately confined in the dielectric film in close proximity to the interface between the dielectric film and the silicon substrate. A high-energy, low-dosage implant process is used and produces a structure that is substantially free of dislocation loops and other defect clusters. An annealing process is used to drive the peak concentration closer to the interface, and some of the population of the originally implanted species from the dielectric film into the silicon substrate.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: December 11, 2001
    Assignees: International Business Machines Corporation, Infineon Technologies North America Corp.
    Inventors: Hiroyuki Akatsu, Omer H. Dokumaci, Suryanarayan G. Hegde, Yujun Li, Rajesh Rengarajan, Paul A. Ronsheim
  • Publication number: 20010046745
    Abstract: A integrated circuit device and method for manufacturing an integrated circuit device includes forming a patterned gate stack, adjacent a storage device, to include a storage node diffusion region adjacent the storage device and a bitline contact diffusion region opposite the storage node diffusion region, implanting an impurity in the storage node diffusion region and the bitline contact diffusion region, forming an insulator layer over the patterned gate stack, removing a portion of the insulator layer from the bitline contact diffusion region to form sidewall spacers along a portion of the patterned gate stack adjacent the bitline contact diffusion region, implanting a halo implant into the bitline contact diffusion region, wherein the insulator layer is free from blocking the halo implant from the second diffusion region and annealing the integrated circuit device to drive the halo implant ahead of the impurity.
    Type: Application
    Filed: February 25, 1999
    Publication date: November 29, 2001
    Inventors: RAMACHANDRA DIVAKARUNI, YUJUN LI, JACK A. MANDELMAN
  • Publication number: 20010030333
    Abstract: A process for forming an ultra-shallow junction depth, doped region within a silicon substrate. The process includes forming a dielectric film on the substrate, then implanting an ionic dopant species into the structure. The profile of the implanted species includes a population implanted through the dielectric film and into the silicon substrate, and a peak concentration deliberately confined in the dielectric film in close proximity to the interface between the dielectric film and the silicon substrate. A high-energy, low-dosage implant process is used and produces a structure that is substantially free of dislocation loops and other defect clusters. An annealing process is used to drive the peak concentration closer to the interface, and some of the population of the originally implanted species from the dielectric film into the silicon substrate.
    Type: Application
    Filed: June 6, 2001
    Publication date: October 18, 2001
    Inventors: Hiroyuki Akatsu, Omer H. Dokumaci, Suryanarayan G. Hegde, Yujun Li, Rajesh Rengarajan, Paul A. Ronsheim
  • Patent number: 6297530
    Abstract: A short channel insulated gate field effect transistor has within the semiconductor body that houses the transistor a buried layer of the same conductivity type as the body but of higher impurity concentration. The buried layer is below the channel region and essentially extends only the distance between the drain and source regions of the transistor. The process to form the device provides high concentration in the region under the gate to suppress lateral depletion region expansion, while keeping a gradual junction in the vertical direction.
    Type: Grant
    Filed: December 28, 1998
    Date of Patent: October 2, 2001
    Assignees: Infineon Technologies North America Corp., International Business Machines Corporation
    Inventors: Hiroyuki Akatsu, Yujun Li, Jochen Beintner