Patents by Inventor Yanxiang Liu

Yanxiang Liu 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: 20160190251
    Abstract: A method of forming a source/drain region with an abrupt, vertical and conformal junction and the resulting device are disclosed. Embodiments include forming a gate electrode over and perpendicular to a semiconductor fin; forming first spacers on opposite sides of the gate electrode; forming second spacers on opposite sides of the fin; forming a cavity in the fin adjacent the first spacers, between the second spacers; partially epitaxially growing source/drain regions in each cavity; implanting a first dopant into the partially grown source/drain regions with an optional RTA thereafter; epitaxially growing a remainder of the source/drain regions in the cavities, in situ doped with a second dopant; and implanting a third dopant in the source/drain regions.
    Type: Application
    Filed: April 2, 2015
    Publication date: June 30, 2016
    Inventors: Peijie FENG, Jianwei PENG, Yanxiang LIU, Shesh Mani PANDEY, Francis BENISTANT
  • Publication number: 20160190252
    Abstract: A method of forming a source/drain region with abrupt vertical and conformal junction and the resulting device are disclosed. Embodiments include forming a first mask over a fin of a first polarity FET and source/drain regions of the first polarity FET; forming spacers on opposite sides of a fin of a second polarity FET, the second polarity being opposite the first polarity, on each side of a gate electrode; implanting a first dopant into the fin of the second polarity FET; etching a cavity in the fin of the second polarity FET on each side of the gate electrode; removing the first mask; performing rapid thermal anneal (RTA); epitaxially growing a source/drain region of the second polarity FET in each cavity; forming a second mask over the fin of the first polarity FET and source/drain regions of the first polarity FET; and implanting a second dopant in the source/drain regions of the second polarity FET.
    Type: Application
    Filed: April 6, 2015
    Publication date: June 30, 2016
    Inventors: Peijie FENG, Yanxiang LIU, Shesh Mani PANDEY, Jianwei PENG, Francis BENISTANT
  • Publication number: 20160126245
    Abstract: Methods for forming an eDRAM with replacement metal gate technology and the resulting device are disclosed. Embodiments include forming first and second dummy electrodes on a substrate, each dummy electrode having spacers at opposite sides and being surrounded by an ILD; removing the first and second dummy electrodes, forming first and second cavities, respectively; forming a hardmask over the substrate, exposing the first cavity; forming a deep trench in the substrate through the first cavity; removing the hardmask; and forming a capacitor in the first cavity and deep trench and concurrently forming an access transistor in the second cavity.
    Type: Application
    Filed: October 29, 2014
    Publication date: May 5, 2016
    Inventors: Yanxiang LIU, Min-hwa CHI
  • Publication number: 20160111322
    Abstract: There is set forth herein in one embodiment a FinFET semiconductor device having a fin extending from a bulk silicon substrate, wherein there is formed wrapped around a portion of the fin a gate, and wherein proximate a channel area of the fin aligned to the gate there is formed a local buried oxide region aligned to the gate. In one embodiment, the local buried oxide region is formed below a channel area of the fin.
    Type: Application
    Filed: December 18, 2015
    Publication date: April 21, 2016
    Applicant: GLOBALFOUNDRIES Inc.
    Inventors: Yanxiang LIU, Min-hwa CHI
  • Publication number: 20160104774
    Abstract: A non-planar lateral drift MOS device eliminates the need for a field plate extension, which reduces gate width. In one example, two sources and two comparatively small gates in a raised structure allow for two channels and a dual current with mirrored flows, each traveling into and downward through a center region of a connecting well that connects the substrate with the drain areas and shallow wells containing the source areas, the current then traveling in opposite directions within the substrate region of the connecting well toward the two drains. The source and drain areas may be separate raised structures or isolated areas of a continuous raised structure.
    Type: Application
    Filed: October 10, 2014
    Publication date: April 14, 2016
    Applicant: GLOBALFOUNDRIES INC.
    Inventors: Jerome CIAVATTI, Yanxiang LIU, Vara Govindeswara Reddy VAKADA
  • Publication number: 20160056265
    Abstract: An isolation region is formed in a semiconductor substrate to laterally define and electrically isolate a device region and first and second laterally adjacent well regions are formed in the device region. A gate structure is formed above the device region such that the first well region extends below an entirety of the gate structure and a well region interface formed between the first and second well regions is laterally offset from a drain-side edge of the gate structure. Source and drain regions are formed in the device region such that the source region extends laterally from a source-side edge of the gate structure and across a first portion of the first well region to a first inner edge of the isolation region and the drain region extends laterally from the drain-side edge and across a second portion of the first well region.
    Type: Application
    Filed: October 26, 2015
    Publication date: February 25, 2016
    Inventors: Jerome Ciavatti, Yanxiang Liu
  • Publication number: 20160035723
    Abstract: The disclosure provides methods and devices for separately determining the channel resistance and the extension resistance of a FinFET. An exemplary embodiment includes forming first and second fins parallel to each other, forming at least one fin portion, connecting the first and second fins, forming a gate perpendicular to the first and second fins, over the at least one fin portion, forming a first source and a first drain over the first fin at opposite sides of the gate, and forming a second source and a second drain over the second fin, separate from the first source and drain, at opposite sides of the gate, wherein each of the first and second sources and first and second drains includes an extension region.
    Type: Application
    Filed: July 30, 2014
    Publication date: February 4, 2016
    Inventors: Xusheng WU, Yanxiang LIU
  • Patent number: 9252272
    Abstract: There is set forth herein in one embodiment a FinFET semiconductor device having a fin extending from a bulk silicon substrate, wherein there is formed wrapped around a portion of the fin a gate, and wherein proximate a channel area of the fin aligned to the gate there is formed a local buried oxide region aligned to the gate. In one embodiment, the local buried oxide region is formed below a channel area of the fin.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: February 2, 2016
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Yanxiang Liu, Min-hwa Chi
  • Publication number: 20150348830
    Abstract: A semiconductor structure with an improved shallow trench isolation (STI) region and method of fabrication is disclosed. The STI region comprises a lower portion filled with oxide and an upper portion comprising a high Young's modulus (HYM) liner disposed on the lower portion and trench sidewalls and filled with oxide. The HYM liner is disposed adjacent to source-drain regions, and serves to reduce stress relaxation within the shallow trench isolation (STI) oxide, which has a relatively low Young's modulus and is soft. Hence, the HYM liner serves to increase the desired stress imparted by the embedded stressor source-drain regions, which enhances carrier mobility, thus increasing semiconductor performance.
    Type: Application
    Filed: August 12, 2015
    Publication date: December 3, 2015
    Applicant: GLOBALFOUNDRIES INC.
    Inventors: Yanxiang Liu, Johannes M. van Meer, Xiaodong Yang, Manfred J. Eller
  • Patent number: 9202911
    Abstract: One illustrative device includes a source region and a drain region formed in a substrate, wherein the source/drain regions are doped with a first type of dopant material, a gate structure positioned above the substrate that is laterally positioned between the source region and the drain region and a drain-side well region positioned in the substrate under a portion, but not all, of the entire lateral width of the drain region, wherein the drain-side well region is also doped with the first type of dopant material. The device also includes a source-side well region positioned in the substrate under an entire width of the source region and under a portion, but not all, of the drain region and a part of the extension portion of the drain region is positioned under a portion of the gate structure.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: December 1, 2015
    Assignee: GLOBALFOUNDRIES Inc.
    Inventors: Jerome Ciavatti, Yanxiang Liu
  • Publication number: 20150287727
    Abstract: Embodiments of the invention provide a semiconductor structure including a finFET having an epitaxial semiconductor region in direct physical contact with a plurality of fins, wherein the epitaxial semiconductor region traverses an insulator layer and is in direct physical contact with the semiconductor substrate. The gate of the finFET is disposed over an insulator layer, such as a buried oxide layer. Methods of forming the semiconductor structure are also included.
    Type: Application
    Filed: June 17, 2015
    Publication date: October 8, 2015
    Applicant: GLOBALFOUNDRIES INC.
    Inventors: Yanxiang Liu, Min-hwa Chi
  • Patent number: 9142316
    Abstract: An OTP anti-fuse memory array without additional selectors and a manufacturing method are provided. Embodiments include forming wells of a first polarity in a substrate, forming a bitline of the first polarity in each well, and forming plural metal gates across each bitline, wherein no source/drain regions are formed between the metal gates.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: September 22, 2015
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Yanxiang Liu, Min-hwa Chi, Anurag Mittal
  • Patent number: 9142640
    Abstract: A non-planar transistor is fabricated with dummy or sacrificial epitaxy and a structure for subsequent replacement or final epitaxy containment is created around the sacrificial epitaxy. The dummy epitaxy is then removed and replaced with the replacement epitaxy. The containment structure allows for uniform growth of the replacement epitaxy and prevents merger. Where n-type and p-type structures are present, the replacement epitaxy process is performed for each type, while protecting the other type with a mask. Optionally, one of the replacement epitaxies, i.e., the one for n-type or p-type, may be used as the dummy epitaxy, resulting in the need for only one mask.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: September 22, 2015
    Assignee: GLOBALFOUNDRIES Inc.
    Inventors: Xusheng Wu, Xiaodong Yang, Yanxiang Liu, Jin Ping Liu
  • Patent number: 9142674
    Abstract: Fin field-effect transistor devices and methods of forming the fin field-effect transistor devices are provided herein. In an embodiment, a fin field-effect transistor device includes a semiconductor substrate that has a fin. A gate electrode structure overlies the fin. Source and drain halo and/or extension regions and epitaxially-grown source regions and drain regions are formed in the fin and are disposed adjacent to the gate electrode structure. A body contact is disposed on a contact surface of the fin, and the body contact is spaced separately from the halo and/or extension regions and the epitaxially-grown source regions and drain regions.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: September 22, 2015
    Assignee: GLOBALFOUNDRIES, INC.
    Inventors: Yanxiang Liu, Michael Hargrove, Christian Gruensfelder
  • Patent number: 9136330
    Abstract: A semiconductor structure with an improved shallow trench isolation (STI) region and method of fabrication is disclosed. The STI region comprises a lower portion filled with oxide and an upper portion comprising a high Young's modulus (HYM) liner disposed on the lower portion and trench sidewalls and filled with oxide. The HYM liner is disposed adjacent to source-drain regions, and serves to reduce stress relaxation within the shallow trench isolation (STI) oxide, which has a relatively low Young's modulus and is soft. Hence, the HYM liner serves to increase the desired stress imparted by the embedded stressor source-drain regions, which enhances carrier mobility, thus increasing semiconductor performance.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: September 15, 2015
    Assignee: GlobalFoundries, Inc.
    Inventors: Yanxiang Liu, Johannes M. van Meer, Xiaodong Yang, Manfred J. Eller
  • Publication number: 20150221770
    Abstract: Approaches for enabling epitaxial growth of silicon fins in a device (e.g., a fin field effect transistor device (FinFET)) are provided. Specifically, approaches are provided for forming a set of silicon fins for a FinFET device, the FinFET device comprising: a set of gate structures formed over a substrate, each of the set of gate structures including a capping layer and a set of spacers; an oxide fill formed over the set of gate structures; a set of openings formed in the device by removing the capping layer and the set of spacers from one or more of the set of gate structures; a silicon material epitaxially grown within the set of openings in the device and then planarized; and wherein the oxide fill is etched to expose the silicon material and form the set of fins.
    Type: Application
    Filed: April 14, 2015
    Publication date: August 6, 2015
    Applicant: GLOBALFOUNDRIES INC.
    Inventors: Johannes M. van Meer, Michael J. Hargrove, Christian Gruensfelder, Yanxiang Liu, Srikanth B. Samavedam
  • Patent number: 9087860
    Abstract: Methods are provided for fabricating a fin-type field effect transistor(s), having a channel region within a fin. The methods include: establishing a protective material above an upper surface of the fin, and an isolation material adjacent to at least one sidewall of the fin, the isolation material being recessed down from the upper surface of the fin, for instance, for approximately a height of the channel region within the fin; and providing a punch-through stop dopant region within the fin below the channel region, the providing including implanting a punch-through stop dopant into the isolation material and laterally diffusing the punch-through stop dopant from the isolation material into the fin to form the punch-through stop region within the fin beneath the channel region.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: July 21, 2015
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Edmund Kenneth Banghart, Yanxiang Liu, Shesh Mani Pandey
  • Patent number: 9087743
    Abstract: Embodiments of the invention provide a semiconductor structure including a finFET having an epitaxial semiconductor region in direct physical contact with a plurality of fins, wherein the epitaxial semiconductor region traverses an insulator layer and is in direct physical contact with the semiconductor substrate. The gate of the finFET is disposed over an insulator layer, such as a buried oxide layer. Methods of forming the semiconductor structure are also included.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: July 21, 2015
    Assignee: GLOBALFOUNDRIES INC.
    Inventors: Yanxiang Liu, Min-hwa Chi
  • Publication number: 20150200251
    Abstract: A process and device are provided for a high-k gate-dielectric operating as a built-in e-fuse. Embodiments include: providing first and second active regions of a transistor, separated by a gate region of the transistor, on a substrate; forming an interfacial layer on the gate region; minimizing the interfacial layer; forming a high-k gate dielectric layer on the interfacial layer to operate as an e-fuse element, the high-k gate dielectric layer and interfacial layer having a combined breakdown voltage less than three times a circuit operating voltage associated with the transistor; and forming a metal gate on the high-k gate dielectric layer.
    Type: Application
    Filed: January 15, 2014
    Publication date: July 16, 2015
    Applicant: GLOBALFOUNDRIES Inc.
    Inventors: Min-hwa CHI, Yanxiang LIU
  • Publication number: 20150200298
    Abstract: Tunneling field effect transistors and fabrication methods thereof are provided, which include: obtaining a gate structure disposed over a substrate structure; and providing a source region and a drain region within the substrate structure separated by a channel region, the channel region underlying, at least partially, the gate structure, and the providing including: modifying the source region to attain a narrowed source region bandgap; and modifying the drain region to attain a narrowed drain region bandgap, the narrowed source region bandgap and the narrowed drain region bandgap facilitating quantum tunneling of charge carriers from the source region or the drain region to the channel region. Devices including digital modulation circuits with one or more tunneling field effect transistor(s) are also provided.
    Type: Application
    Filed: January 16, 2014
    Publication date: July 16, 2015
    Applicant: GLOBALFOUNDRIES INC.
    Inventors: Yanxiang LIU, Min-hwa CHI