Patents by Inventor Yanli Zhang

Yanli Zhang 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: 8236632
    Abstract: An FET structure on a semiconductor substrate which includes forming recesses for a source and a drain of the gate structure on a semiconductor substrate, halo implanting regions through the bottom of the source and drain recesses, the halo implanted regions being underneath the gate stack, implanting junction butting at the bottom of the source and drain recesses, and filling the source and drain recesses with a doped epitaxial material. In exemplary embodiments, the semiconductor substrate is a semiconductor on insulator substrate including a semiconductor layer on a buried oxide layer. In exemplary embodiments, the junction butting and halo implanted regions are in contact with the buried oxide layer. In other exemplary embodiments, there is no junction butting. In exemplary embodiments, halo implants implanted to a lower part of the FET body underneath the gate structure provide higher doping level in lower part of the FET body to reduce body resistance, without interfering with FET threshold voltage.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: August 7, 2012
    Assignee: International Business Machines Corporation
    Inventors: David M. Fried, Jeffrey B. Johnson, Kevin McStay, Paul C. Parries, Chengwen Pei, Gan Wang, Geng Wang, Yanli Zhang
  • Patent number: 8232162
    Abstract: A method of forming a deep trench structure for a semiconductor device includes forming a mask layer over a semiconductor substrate. An opening in the mask layer is formed by patterning the mask layer, and a deep trench is formed in the semiconductor substrate using the patterned opening in the mask layer. A sacrificial fill material is formed over the mask layer and into the deep trench. A first portion of the sacrificial fill material is recessed from the deep trench and a first dopant implant forms a first doped region in the semiconductor substrate. A second portion of the sacrificial fill material is recessed from the deep trench and a second dopant implant forms a second doped region in the semiconductor substrate, wherein the second doped region is formed underneath the first doped region such that the second doped region and the first doped region are contiguous with each other.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: July 31, 2012
    Assignee: International Business Machines Corporation
    Inventors: Roger A. Booth, Jr., Kangguo Cheng, Joseph Ervin, Chengwen Pei, Ravi M. Todi, Geng Wang, Yanli Zhang
  • Publication number: 20120187490
    Abstract: A field effect transistor (FET) structure on a semiconductor substrate which includes a gate structure having a spacer on a semiconductor substrate; an extension implant underneath the gate structure; a recessed source and a recessed drain filled with a doped epitaxial material; halo implanted regions adjacent a bottom of the recessed source and drain and being underneath the gate stack. In an exemplary embodiment, there is implanted junction butting underneath the bottom of each of the recessed source and drain, the junction butting being separate and distinct from the halo implanted regions. In another exemplary embodiment, the doped epitaxial material is graded from a lower dopant concentration at a side of the recessed source and drain to a higher dopant concentration at a center of the recessed source and drain. In a further exemplary embodiment, the semiconductor substrate is a semiconductor on insulator substrate.
    Type: Application
    Filed: March 21, 2012
    Publication date: July 26, 2012
    Applicant: International Business Machines Corporation
    Inventors: David M. Fried, Jeffrey B. Johnson, Kevin McStay, Paul C. Parries, Chengwen Pei, Gan Wang, Geng Wang, Yanli Zhang
  • Publication number: 20120122303
    Abstract: Disclosed is a method of forming a semiconductor device structure in a semiconductor layer. The method includes forming a first trench of a first width and a second trench of a second width in the semiconductor layer; depositing a layer of first material which conforms to a wall of the first trench but does not fill it and which fills the second trench; removing the first material from the first trench, the first material remaining in the second trench; depositing a second material into and filling the first trench and over a top of the first material in the second trench; and uniformly removing the second material from the top of the first material in the second trench, wherein the first trench is filled with the second material and the second trench is filled with the first material and wherein the first material is different from the second material.
    Type: Application
    Filed: November 11, 2010
    Publication date: May 17, 2012
    Applicant: International Business Machines Corporation
    Inventors: PAUL C. PARRIES, Yanli Zhang
  • Publication number: 20120086077
    Abstract: An FET structure on a semiconductor substrate which includes forming recesses for a source and a drain of the gate structure on a semiconductor substrate, halo implanting regions through the bottom of the source and drain recesses, the halo implanted regions being underneath the gate stack, implanting junction butting at the bottom of the source and drain recesses, and filling the source and drain recesses with a doped epitaxial material. In exemplary embodiments, the semiconductor substrate is a semiconductor on insulator substrate including a semiconductor layer on a buried oxide layer. In exemplary embodiments, the junction butting and halo implanted regions are in contact with the buried oxide layer. In other exemplary embodiments, there is no junction butting. In exemplary embodiments, halo implants implanted to a lower part of the FET body underneath the gate structure provide higher doping level in lower part of the FET body to reduce body resistance, without interfering with FET threshold voltage.
    Type: Application
    Filed: October 7, 2010
    Publication date: April 12, 2012
    Applicant: International Business Machines Corporation
    Inventors: DAVID M FRIED, Jeffrey B. Johnson, Kevin McStay, Paul C. Parries, Chengwen Pei, Gan Wang, Geng Wang, Yanli Zhang
  • Publication number: 20120064694
    Abstract: A method of forming a deep trench structure for a semiconductor device includes forming a mask layer over a semiconductor substrate. An opening in the mask layer is formed by patterning the mask layer, and a deep trench is formed in the semiconductor substrate using the patterned opening in the mask layer. A sacrificial fill material is formed over the mask layer and into the deep trench. A first portion of the sacrificial fill material is recessed from the deep trench and a first dopant implant forms a first doped region in the semiconductor substrate. A second portion of the sacrificial fill material is recessed from the deep trench and a second dopant implant forms a second doped region in the semiconductor substrate, wherein the second doped region is formed underneath the first doped region such that the second doped region and the first doped region are contiguous with each other.
    Type: Application
    Filed: September 13, 2010
    Publication date: March 15, 2012
    Applicant: International Business Machines Corporation
    Inventors: Roger A. BOOTH, JR., Kangguo CHENG, Joseph ERVIN, Chengwen PEI, Ravi M. TODI, Geng WANG, Yanli ZHANG
  • Publication number: 20110316061
    Abstract: Semiconductor structures and methods to control bottom corner threshold in a silicon-on-insulator (SOI) device. A method includes doping a corner region of a semiconductor-on-insulator (SOI) island. The doping includes tailoring a localized doping of the corner region to reduce capacitive coupling of the SOI island with an adjacent structure.
    Type: Application
    Filed: June 24, 2010
    Publication date: December 29, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Joseph ERVIN, Jeffrey B. JOHNSON, Kevin MCSTAY, Paul C. PARRIES, Chengwen PEI, Geng WANG, Yanli ZHANG
  • Publication number: 20110291171
    Abstract: A variable capacitance device including a plurality of FETs, the sources and drains of each FET being coupled to a first terminal, the gates of each FET being coupled to a second terminal, the capacitance of said device between said first and second terminals varying as a function of the voltage across said terminals, the device further including a biasing providing a respective backgate bias voltage to each the FETs setting a respective gate threshold voltage thereof. The aggregate V-C characteristic can be tuned as desired, either at design time or dynamically. The greater the number of FETs forming the varactor, the greater the number of possible Vt values that can be individually set, so that arbitrary V-C characteristics can be more closely approximated.
    Type: Application
    Filed: March 17, 2011
    Publication date: December 1, 2011
    Applicant: International Business Machines Corporation
    Inventors: John J. Pekarik, William F. Clark, JR., Robert J. Gauthier, JR., Yun Shi, Yanli Zhang
  • Publication number: 20110291169
    Abstract: A structural alternative to retro doping to reduce transistor leakage is provided by providing a liner in a trench, undercutting a conduction channel region in an active semiconductor layer, etching a side, corner and/or bottom of the conduction channel where the undercut exposes semiconductor material in the active layer and replacing the removed portion of the conduction channel with insulator. This shaping of the conduction channel increases the distance to adjacent circuit elements which, if charged, could otherwise induce a voltage and cause a change in back-channel threshold in regions of the conduction channel and narrows and reduces cross-sectional area of the channel where the conduction in the channel is not well-controlled; both of which effects significantly reduce leakage of the transistor.
    Type: Application
    Filed: June 1, 2010
    Publication date: December 1, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Joseph Ervin, Jeffrey B. Johnson, Paul C. Parries, Chengwen Pei, Geng Wang, Yanli Zhang
  • Publication number: 20110181611
    Abstract: In some embodiments a user interface is adapted to monitor user inputs and one or more controllers are adapted to modify backlight segment brightness and/or image pixel values of a segmented backlight display in response to the monitored user inputs. Other embodiments are described and claimed.
    Type: Application
    Filed: December 21, 2010
    Publication date: July 28, 2011
    Inventors: Yanli Zhang, Akihiro Takagi, Maximino Vasquez, Yinkui Zhang, Xiaoguo Liang
  • Publication number: 20110157212
    Abstract: Techniques are described that can be used to provide color space conversion for images and video to a display color gamut space. Some techniques provide for accessing an sRGB gamut color table, determining a color conversion matrix based on the sRGB gamut color table and chromaticity values of RGBW primary and gamma stored in the display or associated with the display, applying color space conversion to the pixels for pixels using the color conversion matrix, and applying linear correction of pixels by applying a normalization factor to the color conversion matrix. In addition, some techniques provide analysis of content gamut with respect to display gamut in HSV space, adjustment in HSV space, and conversion back to RGB space before applying color space conversion.
    Type: Application
    Filed: December 29, 2009
    Publication date: June 30, 2011
    Inventors: Yanli Zhang, Akihiro Takagi, Sunil Jain
  • Publication number: 20100253611
    Abstract: In some embodiments, a display device may include a flat panel display a controller coupled to the flat panel display. The controller may be configured to determine an operating mode for the flat panel display among a plurality of operating modes including at least a first operating mode and a second operating mode. In the first operating mode, the controller may set the flat panel display to utilize a first frame rate and a first inversion mode to save power. In the second operating mode, the controller may set the flat panel display to utilize a second frame rate, a second inversion mode, and black frame insertion to improve image quality. The second frame rate may be faster than the first frame rate. The second inversion mode and black frame insertion may be mutually configured to maintain a DC balanced operation of the flat panel display. Other embodiments are disclosed and claimed.
    Type: Application
    Filed: April 6, 2009
    Publication date: October 7, 2010
    Inventors: Akihiro Takagi, Cheng-Shih Chin, Yanli Zhang, Maximino Vasquez
  • Publication number: 20090327777
    Abstract: Some embodiments describe techniques that relate to power efficient, high frequency displays with motion blur mitigation. In one embodiment, the refresh rate of a display device may be dynamically modified, e.g., to reduce power consumption and/or reduce motion blur. Other embodiments are also described.
    Type: Application
    Filed: June 30, 2008
    Publication date: December 31, 2009
    Inventors: Maximino Vasquez, Akihiro Takagi, Yanli Zhang, Achintya K. Bhowmik
  • Publication number: 20090322795
    Abstract: A system, apparatus and method to reduce power consumption for displays is described. The method may include receiving image data comprising a plurality of color components, generating a histogram for each of the plurality of color components, and adjusting each of a plurality of light sources based on the histograms. The plurality of light sources may correspond to the plurality of color components. Other embodiments are described and claimed.
    Type: Application
    Filed: June 30, 2008
    Publication date: December 31, 2009
    Inventors: Maximino Vasquez, Achintya Bhowmik, Yanli Zhang, Akihiro Takagi