Patents by Inventor Titash Rakshit

Titash Rakshit 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: 9960232
    Abstract: A horizontal nanosheet field effect transistor (hNS FET) including source and drain electrodes, a gate electrode between the source and drain electrodes, a first spacer separating the source electrode from the gate electrode, a second spacer separating the drain electrode from the gate electrode, and a channel region under the gate electrode and extending between the source electrode and the drain electrode. The source electrode and the drain electrode each include an extension region. The extension region of the source electrode is under at least a portion of the first spacer and the extension region of the drain electrode is under at least a portion of the second spacer. The hNS FET also includes at least one layer of crystalline barrier material having a first thickness at the extension regions of the source and drain electrodes and a second thickness less than the first thickness at the channel region.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: May 1, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Borna Obradovic, Titash Rakshit, Mark Rodder
  • Publication number: 20180053550
    Abstract: A neuron circuit for use in a neural network is disclosed. The neural network includes a plurality of field effect transistors having confined channels. The sources and drains of the field effect transistors are connected in series. A plurality of input terminals for receiving a plurality of input voltages may be connected to a drain terminal of a corresponding field effect transistor. The threshold voltages of the field effect transistors can be programmed by increasing or decreasing a number of excess minority carriers in the confined channels, thereby programming the resistance presented by the field effect transistor.
    Type: Application
    Filed: November 3, 2016
    Publication date: February 22, 2018
    Inventors: Titash Rakshit, Borna J. Obradovic
  • Publication number: 20170323941
    Abstract: A horizontal nanosheet field effect transistor (hNS FET) including source and drain electrodes, a gate electrode between the source and drain electrodes, a first spacer separating the source electrode from the gate electrode, a second spacer separating the drain electrode from the gate electrode, and a channel region under the gate electrode and extending between the source electrode and the drain electrode. The source electrode and the drain electrode each include an extension region. The extension region of the source electrode is under at least a portion of the first spacer and the extension region of the drain electrode is under at least a portion of the second spacer. The hNS FET also includes at least one layer of crystalline barrier material having a first thickness at the extension regions of the source and drain electrodes and a second thickness less than the first thickness at the channel region.
    Type: Application
    Filed: November 1, 2016
    Publication date: November 9, 2017
    Inventors: Borna Obradovic, Titash Rakshit, Mark Rodder
  • Patent number: 9812449
    Abstract: A nanosheet field effect transistor design in which the threshold voltage is adjustable by adjusting the composition of the gate. The channel of the nanosheet field effect transistor may be composed of a III-V semiconductor material, and the gate, which may be separated from the channel by a high dielectric constant dielectric layer, may also be composed of a III-V semiconductor material. Adjusting the composition of the gate may result in a change in the affinity of the gate, in turn resulting in a change in the threshold voltage. In some embodiments the channel is composed, for example, of InxGa1-xAs, with x between 0.23 and 0.53, and the gate is composed of InAs1-yNy with y between 0.0 and 0.4, and the values of x and y may be adjusted to adjust the threshold voltage.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: November 7, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Borna J. Obradovic, Titash Rakshit, Mark S. Rodder, Wei-E Wang
  • Patent number: 9806193
    Abstract: Embodiments relate to an improved tri-gate device having gate metal fills, providing compressive or tensile stress upon at least a portion of the tri-gate transistor, thereby increasing the carrier mobility and operating frequency. Embodiments also contemplate method for use of the improved tri-gate device.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: October 31, 2017
    Assignee: Intel Corporation
    Inventors: Titash Rakshit, Martin Giles, Ravi Pillarisetty, Jack T. Kavalieros
  • Patent number: 9805795
    Abstract: A non-volatile data retention circuit, which is configured to store complementary volatile charge states of an external latch, comprises a coupled giant spin hall latch configured to generate and store complementary non-volatile spin states corresponding to the complementary volatile charge states of the external latch in response to receiving a charge current from the external latch, and to generate a differential charge current signal corresponding to the complementary non-volatile spin states in response to application of a read voltage, a write switch coupled to the coupled giant spin hall latch and configured to selectively enable flow of the charge current from the external latch to the coupled giant spin hall latch in response to a sleep signal, and a read switch coupled to the coupled giant spin hall latch and to selectively enable the application of the read voltage to the coupled giant spin hall latch.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: October 31, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Titash Rakshit, Borna Obradovic
  • Publication number: 20170301672
    Abstract: An integrated circuit (IC) including a circuit block including a plurality of complementary metal oxide semiconductor field-effect transistors (CMOSFETs), and a tunnel field-effect transistor (TFET) between the circuit block and ground for power gating the circuit block.
    Type: Application
    Filed: September 26, 2016
    Publication date: October 19, 2017
    Inventors: Titash Rakshit, Mark Rodder, Rwik Sengupta
  • Patent number: 9793403
    Abstract: Multi-layer fin field effect transistor devices and methods of forming the same are provided. The devices may include a fin shaped channel structure on a substrate. The channel structure may include stressor layers stacked on the substrate and a channel layer between the stressor layers, and the stressor layers may include a semiconductor material having a wide bandgap that is sufficient to confine carriers to the channel layer and having a lattice constant different from a lattice constant of the channel layer to induce stress in the channel layer. The devices may also include source/drain regions on respective first opposing sides of the channel structure and a gate on second opposing sides of the channel structure and between the source/drain regions.
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: October 17, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Borna J. Obradovic, Robert C. Bowen, Titash Rakshit, Wei-E Wang, Mark S. Rodder
  • Patent number: 9773904
    Abstract: A vertical field effect device includes a substrate and a vertical channel including InxGa1-xAs on the substrate. The vertical channel includes a pillar that extends from the substrate and includes opposing vertical surfaces. The device further includes a stressor layer on the opposing vertical surfaces of the vertical channel. The stressor layer includes a layer of epitaxial crystalline material that is epitaxially formed on the vertical channel and that has lattice constant in a vertical plane corresponding to one of the opposing vertical surfaces of the vertical channel that is greater than a corresponding lattice constant of the vertical channel.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: September 26, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Borna Obradovic, Chris Bowen, Titash Rakshit, Palle Dharmendar, Mark Rodder
  • Publication number: 20170271474
    Abstract: According to an embodiment of the present invention, a method of manufacturing a FET device having a set BTBT leakage and a maximum VDD includes: determining an x value in InxGa1?xAs according to the BTBT leakage and the maximum VDD, and forming a channel utilizing InxGa1?xA, wherein x is not 0.53.
    Type: Application
    Filed: November 8, 2016
    Publication date: September 21, 2017
    Inventors: Borna J. Obradovic, Titash Rakshit, Mark S. Rodder
  • Publication number: 20170200499
    Abstract: A non-volatile data retention circuit, which is configured to store complementary volatile charge states of an external latch, comprises a coupled giant spin hall latch configured to generate and store complementary non-volatile spin states corresponding to the complementary volatile charge states of the external latch in response to receiving a charge current from the external latch, and to generate a differential charge current signal corresponding to the complementary non-volatile spin states in response to application of a read voltage, a write switch coupled to the coupled giant spin hall latch and configured to selectively enable flow of the charge current from the external latch to the coupled giant spin hall latch in response to a sleep signal, and a read switch coupled to the coupled giant spin hall latch and to selectively enable the application of the read voltage to the coupled giant spin hall latch.
    Type: Application
    Filed: September 14, 2016
    Publication date: July 13, 2017
    Inventors: Titash Rakshit, Borna Obradovic
  • Patent number: 9685564
    Abstract: A Gate-All-Around (GAA) Field Effect Transistor (FET) can include a horizontal nanosheet conductive channel structure having a width in a horizontal direction in the GAA FET, a height that is perpendicular to the horizontal direction, and a length that extends in the horizontal direction, where the width of the horizontal nanosheet conductive channel structure defines a physical channel width of the GAA FET. First and second source/drain regions can be located at opposing ends of the horizontal nanosheet conductive channel structure and a unitary gate material completely surrounding the horizontal nanosheet conductive channel structure.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: June 20, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Rwik Sengupta, Mark Stephen Rodder, Joon Goo Hong, Titash Rakshit
  • Publication number: 20170148787
    Abstract: A nanosheet field effect transistor design in which the threshold voltage is adjustable by adjusting the composition of the gate. The channel of the nanosheet field effect transistor may be composed of a III-V semiconductor material, and the gate, which may be separated from the channel by a high dielectric constant dielectric layer, may also be composed of a III-V semiconductor material. Adjusting the composition of the gate may result in a change in the affinity of the gate, in turn resulting in a change in the threshold voltage. In some embodiments the channel is composed, for example, of InxGa1-xAs, with x between 0.23 and 0.53, and the gate is composed of InAs1-yNy with y between 0.0 and 0.4, and the values of x and y may be adjusted to adjust the threshold voltage.
    Type: Application
    Filed: May 18, 2016
    Publication date: May 25, 2017
    Inventors: Borna J. Obradovic, Titash Rakshit, Mark S. Rodder, Wei-E Wang
  • Publication number: 20170133462
    Abstract: Methods of forming microelectronic structures are described. Embodiments of those methods include forming a nanowire device comprising a substrate comprising source/drain structures adjacent to spacers, and nanowire channel structures disposed between the spacers, wherein the nanowire channel structures are vertically stacked above each other.
    Type: Application
    Filed: January 19, 2017
    Publication date: May 11, 2017
    Inventors: Kelin J. KUHN, Seiyon KIM, Rafael RIOS, Stephen M. CEA, Martin D. GILES, Annalisa CAPPELLANI, Titash RAKSHIT, Peter CHANG, Willy RACHMADY
  • Publication number: 20170110595
    Abstract: A Gate-All-Around (GAA) Field Effect Transistor (FET) can include a horizontal nanosheet conductive channel structure having a width in a horizontal direction in the GAA FET, a height that is perpendicular to the horizontal direction, and a length that extends in the horizontal direction, where the width of the horizontal nanosheet conductive channel structure defines a physical channel width of the GAA FET. First and second source/drain regions can be located at opposing ends of the horizontal nanosheet conductive channel structure and a unitary gate material completely surrounding the horizontal nanosheet conductive channel structure.
    Type: Application
    Filed: May 9, 2016
    Publication date: April 20, 2017
    Inventors: Rwik Sengupta, Mark Stephen RODDER, Joon Goo HONG, Titash RAKSHIT
  • Publication number: 20170098661
    Abstract: A semiconductor device includes a series of metal routing layers and a complementary pair of planar field-effect transistors (FETs) on an upper metal routing layer of the metal routing layers. The upper metal routing layer is M3 or higher. Each of the FETs includes a channel region of a crystalline material. The crystalline material may include one or more transition metal dichalcogenide materials such as MoS2, WS2, WSe2, and/or combinations thereof.
    Type: Application
    Filed: July 14, 2016
    Publication date: April 6, 2017
    Inventors: Titash Rakshit, Borna J. Obradovic, Rwik Sengupta, Wei-E Wang, Ryan Hatcher, Mark S. Rodder
  • Patent number: 9614002
    Abstract: A bidirectional memory cell includes a write unit and a read unit. The write unit and the read unit each include an MTJ structure having a first and second pinned layers and a free layer. The first and second pinned layers are separated from the free layer by at least one tunnel barrier. The first pinned layer is electrically coupled to a first write line through a first diode. The second pinned layer is electrically connected to a second word line through a second diode. The free layer is electrically coupled to a first bit line. Additionally, the free layer of the read unit is magnetically coupled to the free layer of the write unit.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: April 4, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Ryan M. Hatcher, Titash Rakshit, Borna J. Obradovic, Jorge Kittl, Joon Goo Hong
  • Publication number: 20170077304
    Abstract: A vertical field effect device includes a substrate and a vertical channel including InxGa1-xAs on the substrate. The vertical channel includes a pillar that extends from the substrate and includes opposing vertical surfaces. The device further includes a stressor layer on the opposing vertical surfaces of the vertical channel. The stressor layer includes a layer of epitaxial crystalline material that is epitaxially formed on the vertical channel and that has lattice constant in a vertical plane corresponding to one of the opposing vertical surfaces of the vertical channel that is greater than a corresponding lattice constant of the vertical channel.
    Type: Application
    Filed: April 19, 2016
    Publication date: March 16, 2017
    Inventors: Borna Obradovic, Chris Bowen, Titash Rakshit, Palle Dharmendar, Mark Rodder
  • Patent number: 9595581
    Abstract: Methods of forming microelectronic structures are described. Embodiments of those methods include forming a nanowire device comprising a substrate comprising source/drain structures adjacent to spacers, and nanowire channel structures disposed between the spacers, wherein the nanowire channel structures are vertically stacked above each other.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: March 14, 2017
    Assignee: Intel Corporation
    Inventors: Kelin J. Kuhn, Seiyon Kim, Rafael Rios, Stephen M. Cea, Martin D. Giles, Annalisa Cappellani, Titash Rakshit, Peter Chang, Willy Rachmady
  • Publication number: 20160372597
    Abstract: Embodiments relate to an improved tri-gate device having gate metal fills, providing compressive or tensile stress upon at least a portion of the tri-gate transistor, thereby increasing the carrier mobility and operating frequency. Embodiments also contemplate method for use of the improved tri-gate device.
    Type: Application
    Filed: August 29, 2016
    Publication date: December 22, 2016
    Inventors: Titash RAKSHIT, Martin GILES, Ravi PILLARISETTY, Jack T. KAVALIEROS