Patents by Inventor Wenjuan Zhu

Wenjuan Zhu 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: 11527648
    Abstract: Transistors with switchable polarity and non-volatile configurations are provided. The transistors include a van der Waals (vdW) semiconductor layer. A ferroelectric layer with local polarization determines the type and concentration of the doping in the vdW semiconductor layer. Local program gates allow application of voltage to set or switch the polarization in the ferroelectric layer in the source and drain regions. Source and drain contacts permit either n-type or p-type transistor operations according to the carrier polarity in the vdW semiconductor layer.
    Type: Grant
    Filed: February 1, 2021
    Date of Patent: December 13, 2022
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Wenjuan Zhu, Kai Xu, Jialun Liu, Zijing Zhao
  • Patent number: 11239320
    Abstract: A classifier circuit includes an array of dual gate graphene transistors, each of the transistors having a source, a top gate receiving one of an input voltage to be evaluated or a reference voltage, a bottom or embedded gate receiving the other of the input voltage or reference voltage and a drain, the source and drain contacting a graphene channel One of the source and the drain is connected to a voltage source. A common output combines output current of a plurality of the dual gate graphene transistors, which current varies in response to the difference between the input voltage and the reference voltage. A method for forming a classifier transistor with high remanent polarization forms dielectric with ferroelectric capability on a low resistivity substrate. A non-ferroelectric oxide layer is formed on the dielectric. A window is opened, and a graphene channel is formed in the window.
    Type: Grant
    Filed: December 6, 2019
    Date of Patent: February 1, 2022
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Wenjuan Zhu, Jialun Liu, Hojoon Ryu
  • Publication number: 20210249539
    Abstract: Transistors with switchable polarity and non-volatile configurations are provided. The transistors include a van der Waals (vdW) semiconductor layer. A ferroelectric layer with local polarization determines the type and concentration of the doping in the vdW semiconductor layer. Local program gates allow application of voltage to set or switch the polarization in the ferroelectric layer in the source and drain regions. Source and drain contacts permit either n-type or p-type transistor operations according to the carrier polarity in the vdW semiconductor layer.
    Type: Application
    Filed: February 1, 2021
    Publication date: August 12, 2021
    Inventors: Wenjuan Zhu, Kai Xu, Jialun Liu, Zijing Zhao
  • Publication number: 20200194557
    Abstract: A classifier circuit includes an array of dual gate graphene transistors, each of the transistors having a source, a top gate receiving one of an input voltage to be evaluated or a reference voltage, a bottom or embedded gate receiving the other of the input voltage or reference voltage and a drain, the source and drain contacting a graphene channel One of the source and the drain is connected to a voltage source. A common output combines output current of a plurality of the dual gate graphene transistors, which current varies in response to the difference between the input voltage and the reference voltage. A method for forming a classifier transistor with high remanent polarization forms dielectric with ferroelectric capability on a low resistivity substrate. A non-ferroelectric oxide layer is formed on the dielectric. A window is opened, and a graphene channel is formed in the window.
    Type: Application
    Filed: December 6, 2019
    Publication date: June 18, 2020
    Inventors: Wenjuan Zhu, Jialun Liu, Hojoon Ryu
  • Patent number: 10385390
    Abstract: A technique for a nanodevice is provided. A reservoir is separated into two parts by a membrane. A nanopore is formed through the membrane, and the nanopore connects the two parts of the reservoir. The nanopore and the two parts of the reservoir are filled with ionic buffer. The membrane includes a graphene layer and insulating layers. The graphene layer is wired to first and second metal pads to form a graphene transistor in which transistor current flowing through the graphene transistor is modulated by charges or dipoles passing through the nanopore.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: August 20, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hongbo Peng, Gustavo A. Stolovitzky, Wenjuan Zhu
  • Patent number: 10236386
    Abstract: The present disclosure provides vertical hetero- and homo-junction tunnel FET (TFET) based on multi-layer black phosphorus (BP) and transition metal dichalcogenides.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: March 19, 2019
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Wenjuan Zhu, Shang-Chun Lu, Mohamed Mohamed
  • Publication number: 20180204953
    Abstract: The present disclosure provides vertical hetero- and homo-junction tunnel FET (TFET) based on multi-layer black phosphorus (BP) and transition metal dichalcogenides.
    Type: Application
    Filed: December 15, 2017
    Publication date: July 19, 2018
    Applicant: The Board of Trustees of the University of Illinois
    Inventors: Wenjuan Zhu, Shang-Chun Lu, Mohamed Mohamed
  • Publication number: 20170298429
    Abstract: A technique for a nanodevice is provided. A reservoir is separated into two parts by a membrane. A nanopore is formed through the membrane, and the nanopore connects the two parts of the reservoir. The nanopore and the two parts of the reservoir are filled with ionic buffer. The membrane includes a graphene layer and insulating layers. The graphene layer is wired to first and second metal pads to form a graphene transistor in which transistor current flowing through the graphene transistor is modulated by charges or dipoles passing through the nanopore.
    Type: Application
    Filed: June 29, 2017
    Publication date: October 19, 2017
    Inventors: Hongbo Peng, Gustavo A. Stolovitzky, Wenjuan Zhu
  • Patent number: 9765392
    Abstract: A technique for a nanodevice is provided. A reservoir is separated into two parts by a membrane. A nanopore is formed through the membrane, and the nanopore connects the two parts of the reservoir. The nanopore and the two parts of the reservoir are filled with ionic buffer. The membrane includes a graphene layer and insulating layers. The graphene layer is wired to first and second metal pads to form a graphene transistor in which transistor current flowing through the graphene transistor is modulated by charges or dipoles passing through the nanopore.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: September 19, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hongbo Peng, Gustavo A. Stolovitzky, Wenjuan Zhu
  • Patent number: 9758822
    Abstract: A technique for a nanodevice is provided. A reservoir is separated into two parts by a membrane. A nanopore is formed through the membrane, and the nanopore connects the two parts of the reservoir. The nanopore and the two parts of the reservoir are filled with ionic buffer. The membrane includes a graphene layer and insulating layers. The graphene layer is wired to first and second metal pads to form a graphene transistor in which transistor current flowing through the graphene transistor is modulated by charges or dipoles passing through the nanopore.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: September 12, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hongbo Peng, Gustavo A. Stolovitzky, Wenjuan Zhu
  • Patent number: 9758821
    Abstract: A technique for a nanodevice is provided. A reservoir is separated into two parts by a membrane. A nanopore is formed through the membrane, and the nanopore connects the two parts of the reservoir. The nanopore and the two parts of the reservoir are filled with ionic buffer. The membrane includes a graphene layer and insulating layers. The graphene layer is wired to first and second metal pads to form a graphene transistor in which transistor current flowing through the graphene transistor is modulated by charges passing through the nanopore.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: September 12, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Hongbo Peng, Gustavo A. Stolovitzky, Wenjuan Zhu
  • Patent number: 9377431
    Abstract: A technique is provided for performing sequencing with a nanodevice. Alternating graphene layers and dielectric layers are provided one on top of another to form a multilayer stack of heterojunctions. The dielectric layers include boron nitride, molybdenum disulfide, and/or hafnium disulfide layers. A nanopore is formed through the graphene layers and the dielectric layers. The graphene layers are individually addressed by applying individual voltages to each of the graphene layers on a one to one basis when a particular base of a molecule is in the nanopore. Each of the graphene layers is an electrode. Individual electrical currents are measured for each of the graphene layers as the particular base moves from a first graphene layer through a last graphene layer in the nanopore. The base is identified according to the individual electrical currents repeatedly measured for the base moving from the first through last graphene layer in the nanopore.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: June 28, 2016
    Assignee: GLOBALFOUNDRIES INC.
    Inventor: Wenjuan Zhu
  • Patent number: 9377432
    Abstract: A technique is provided for performing sequencing with a nanodevice. Alternating graphene layers and dielectric layers are provided one on top of another to form a multilayer stack of heterojunctions. The dielectric layers include boron nitride, molybdenum disulfide, and/or hafnium disulfide layers. A nanopore is formed through the graphene layers and the dielectric layers. The graphene layers are individually addressed by applying individual voltages to each of the graphene layers on a one to one basis when a particular base of a molecule is in the nanopore. Each of the graphene layers is an electrode. Individual electrical currents are measured for each of the graphene layers as the particular base moves from a first graphene layer through a last graphene layer in the nanopore. The base is identified according to the individual electrical currents repeatedly measured for the base moving from the first through last graphene layer in the nanopore.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: June 28, 2016
    Assignee: GLOBALFOUNDRIES INC.
    Inventor: Wenjuan Zhu
  • Publication number: 20150028845
    Abstract: A technique is provided for performing sequencing with a nanodevice. Alternating graphene layers and dielectric layers are provided one on top of another to form a multilayer stack of heterojunctions. The dielectric layers include boron nitride, molybdenum disulfide, and/or hafnium disulfide layers. A nanopore is formed through the graphene layers and the dielectric layers. The graphene layers are individually addressed by applying individual voltages to each of the graphene layers on a one to one basis when a particular base of a molecule is in the nanopore. Each of the graphene layers is an electrode. Individual electrical currents are measured for each of the graphene layers as the particular base moves from a first graphene layer through a last graphene layer in the nanopore. The base is identified according to the individual electrical currents repeatedly measured for the base moving from the first through last graphene layer in the nanopore.
    Type: Application
    Filed: July 24, 2013
    Publication date: January 29, 2015
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventor: Wenjuan Zhu
  • Publication number: 20150028846
    Abstract: A technique is provided for performing sequencing with a nanodevice. Alternating graphene layers and dielectric layers are provided one on top of another to form a multilayer stack of heterojunctions. The dielectric layers include boron nitride, molybdenum disulfide, and/or hafnium disulfide layers. A nanopore is formed through the graphene layers and the dielectric layers. The graphene layers are individually addressed by applying individual voltages to each of the graphene layers on a one to one basis when a particular base of a molecule is in the nanopore. Each of the graphene layers is an electrode. Individual electrical currents are measured for each of the graphene layers as the particular base moves from a first graphene layer through a last graphene layer in the nanopore. The base is identified according to the individual electrical currents repeatedly measured for the base moving from the first through last graphene layer in the nanopore.
    Type: Application
    Filed: August 20, 2013
    Publication date: January 29, 2015
    Applicant: International Business Machines Corporation
    Inventor: Wenjuan Zhu
  • Patent number: 8901680
    Abstract: Semiconductor nano pressure sensor devices having graphene membrane suspended over cavities formed in a semiconductor substrate. A suspended graphene membrane serves as an active electro-mechanical membrane for sensing pressure, which can be made very thin, from about one atomic layer to about 10 atomic layers in thickness, to improve the sensitivity and reliability of a semiconductor pressure sensor device.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: December 2, 2014
    Assignee: International Business Machines Corporation
    Inventors: Jin Cai, Yanqing Wu, Wenjuan Zhu
  • Patent number: 8852985
    Abstract: Semiconductor nano pressure sensor devices having graphene membrane suspended over open cavities formed in a semiconductor substrate. A suspended graphene membrane serves as an active electro-mechanical membrane for sensing pressure, which can be made very thin, from about one atomic layer to about 10 atomic layers in thickness, to improve the sensitivity and reliability of a semiconductor pressure sensor device.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: October 7, 2014
    Assignee: International Business Machines Corporation
    Inventors: Jin Cai, Yanqing Wu, Wenjuan Zhu
  • Patent number: 8748871
    Abstract: A three-dimensional integrated circuit includes a semiconductor device, an insulator formed on the semiconductor device, an interconnect formed in the insulator, and a graphene device formed on the insulator.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: June 10, 2014
    Assignee: International Business Machines Corporation
    Inventors: Phaedon Avouris, Josephine B. Chang, Wilfried E. Haensch, Fei Liu, Zihong Liu, Yanqing Wu, Wenjuan Zhu
  • Patent number: 8735242
    Abstract: A method of forming a semiconductor device includes forming a field-effect transistor (FET), and forming a fuse which includes a graphene layer and is electrically connected to the FET.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: May 27, 2014
    Assignee: International Business Machines Corporation
    Inventor: Wenjuan Zhu
  • Publication number: 20140141521
    Abstract: A technique for a nanodevice is provided. A reservoir is separated into two parts by a membrane. A nanopore is formed through the membrane, and the nanopore connects the two parts of the reservoir. The nanopore and the two parts of the reservoir are filled with ionic buffer. The membrane includes a graphene layer and insulating layers. The graphene layer is wired to first and second metal pads to form a graphene transistor in which transistor current flowing through the graphene transistor is modulated by charges or dipoles passing through the nanopore.
    Type: Application
    Filed: January 24, 2014
    Publication date: May 22, 2014
    Applicant: International Business Machines Corporation
    Inventors: Hongbo Peng, Gustavo A. Stolovitzky, Wenjuan Zhu