Patents by Inventor Ashonita A. Chavan

Ashonita A. Chavan 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: 9460770
    Abstract: Methods of operating a ferroelectric memory cell. The method comprises applying one of a positive bias voltage and a negative bias voltage to a ferroelectric memory cell comprising a capacitor including a top electrode, a bottom electrode, a ferroelectric material between the top electrode and the bottom electrode, and an interfacial material between the ferroelectric material and one of the top electrode and the bottom electrode. The method further comprises applying another of the positive bias voltage and the negative bias voltage to the ferroelectric memory cell to switch a polarization of the ferroelectric memory cell, wherein an absolute value of the negative bias voltage is different from an absolute value of the positive bias voltage. Ferroelectric memory cells are also described.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: October 4, 2016
    Assignee: Micron Technology, Inc.
    Inventors: Steven C. Nicholes, Ashonita A. Chavan, Matthew N. Rocklein
  • Publication number: 20160240545
    Abstract: A memory cell includes a select device and a capacitor electrically coupled in series with the select device. The capacitor includes two conductive capacitor electrodes having ferroelectric material there-between. The capacitor has an intrinsic current leakage path from one of the capacitor electrodes to the other through the ferroelectric material. There is a parallel current leakage path from the one capacitor electrode to the other. The parallel current leakage path is circuit-parallel the intrinsic path and of lower total resistance than the intrinsic path. Other aspects are disclosed.
    Type: Application
    Filed: March 9, 2016
    Publication date: August 18, 2016
    Inventors: Kamal M. Karda, Qian Tao, Durai Vishak Nirmal Ramaswamy, Haitao Liu, Kirk D. Prall, Ashonita A. Chavan
  • Patent number: 9305929
    Abstract: A memory cell includes a select device and a capacitor electrically coupled in series with the select device. The capacitor includes two conductive capacitor electrodes having ferroelectric material there-between. The capacitor has an intrinsic current leakage path from one of the capacitor electrodes to the other through the ferroelectric material. There is a parallel current leakage path from the one capacitor electrode to the other. The parallel current leakage path is circuit-parallel the intrinsic path and of lower total resistance than the intrinsic path. Other aspects are disclosed.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: April 5, 2016
    Assignee: Micron Technology, Inc.
    Inventors: Kamal M. Karda, Qian Tao, Durai Vishak Nirmal Ramaswamy, Haitao Liu, Kirk D. Prall, Ashonita A. Chavan
  • Publication number: 20150340372
    Abstract: A ferroelectric memory device includes a plurality of memory cells. Each of the memory cells comprises at least one electrode and a ferroelectric crystalline material disposed proximate the at least one electrode. The ferroelectric crystalline material is polarizable by an electric field capable of being generated by electrically charging the at least one electrode. The ferroelectric crystalline material comprises a polar and chiral crystal structure without inversion symmetry through an inversion center. The ferroelectric crystalline material does not consist essentially of an oxide of at least one of hafnium (Hf) and zirconium (Zr).
    Type: Application
    Filed: May 20, 2014
    Publication date: November 26, 2015
    Applicant: MICRON TECHNOLOGY, INC.
    Inventors: Sumeet C. Pandey, Lei Bi, Roy E. Meade, Qian Tao, Ashonita A. Chavan
  • Publication number: 20150311217
    Abstract: Ferroelectric memory and methods of forming the same are provided. An example memory cell can include a buried recessed access device (BRAD) formed in a substrate and a ferroelectric capacitor formed on the BRAD.
    Type: Application
    Filed: April 28, 2014
    Publication date: October 29, 2015
    Applicant: Micron Technology, Inc.
    Inventors: Ashonita A. Chavan, Alessandro Calderoni, D.V. Nirmal Ramaswamy
  • Publication number: 20150303206
    Abstract: A method of forming a ferroelectric capacitor includes forming inner conductive capacitor electrode material over a substrate. After forming the inner electrode material, an outermost region of the inner electrode material is treated to increase carbon content in the outermost region from what it was prior to the treating. After the treating, ferroelectric capacitor dielectric material is formed over the treated outermost region of the inner electrode material. Outer conductive capacitor electrode material is formed over the ferroelectric capacitor dielectric material.
    Type: Application
    Filed: April 16, 2014
    Publication date: October 22, 2015
    Applicant: Micron Technology, Inc.
    Inventors: Ashonita A. Chavan, Durai Vishak Nirmal Ramaswamy, Qian Tao
  • Patent number: 9147689
    Abstract: A method of forming a ferroelectric capacitor includes forming inner conductive capacitor electrode material over a substrate. After forming the inner electrode material, an outermost region of the inner electrode material is treated to increase carbon content in the outermost region from what it was prior to the treating. After the treating, ferroelectric capacitor dielectric material is formed over the treated outermost region of the inner electrode material. Outer conductive capacitor electrode material is formed over the ferroelectric capacitor dielectric material.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: September 29, 2015
    Assignee: Micron Technology, Inc.
    Inventors: Ashonita A. Chavan, Durai Vishak Nirmal Ramaswamy, Qian Tao
  • Patent number: 8604461
    Abstract: A semiconductor device may include a doped semiconductor region having a modulated dopant concentration. The doped semiconductor region may be a silicon doped Group III nitride semiconductor region with a dopant concentration of silicon being modulated in the Group III nitride semiconductor region. In addition, a semiconductor active region may be configured to generate light responsive to an electrical signal therethrough. Related methods, devices, and structures are also discussed.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: December 10, 2013
    Assignee: Cree, Inc.
    Inventors: Daniel Carleton Driscoll, Ashonita Chavan, Adam William Saxler
  • Patent number: 8575592
    Abstract: A Group III nitride based light emitting diode includes a p-type Group III nitride based semiconductor layer, an n-type Group III nitride based semiconductor layer that forms a P-N junction with the p-type Group III nitride based semiconductor layer, and a Group III nitride based active region on the n-type Group III nitride based semiconductor layer. The active region includes a plurality of sequentially stacked Group III nitride based wells including respective well layers. The plurality of well layers includes a first well layer having a first thickness and a second well layer having a second thickness. The second well layer is between the P-N junction and the first well layer, and the second thickness is greater than the first thickness.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: November 5, 2013
    Assignee: Cree, Inc.
    Inventors: Michael John Bergmann, Daniel Carleton Driscoll, Ashonita Chavan, Pablo Cantu-Alejandro, James Ibbotson
  • Patent number: 8536615
    Abstract: A semiconductor device may include a doped semiconductor region wherein a dopant concentration of the semiconductor region is modulated over a plurality of intervals. Each interval may include at least one portion having a relatively low dopant concentration and at least one portion having a relatively high dopant concentration. A plurality of delta doped layers may be included in the plurality of intervals. Related methods are also discussed.
    Type: Grant
    Filed: August 2, 2010
    Date of Patent: September 17, 2013
    Assignee: Cree, Inc.
    Inventors: Daniel Carleton Driscoll, Ashonita Chavan, Adam William Saxler
  • Publication number: 20110187294
    Abstract: A Group III nitride based light emitting diode includes a p-type Group III nitride based semiconductor layer, an n-type Group III nitride based semiconductor layer that forms a P-N junction with the p-type Group III nitride based semiconductor layer, and a Group III nitride based active region on the n-type Group III nitride based semiconductor layer. The active region includes a plurality of sequentially stacked Group III nitride based wells including respective well layers. The plurality of well layers includes a first well layer having a first thickness and a second well layer having a second thickness. The second well layer is between the P-N junction and the first well layer, and the second thickness is greater than the first thickness.
    Type: Application
    Filed: February 3, 2010
    Publication date: August 4, 2011
    Inventors: Michael John Bergmann, Daniel Carleton Driscoll, Ashonita Chavan, Pablo Cantu-Alejandro, James Ibbetson
  • Publication number: 20110140083
    Abstract: A semiconductor device may include a doped semiconductor region having a modulated dopant concentration. The doped semiconductor region may be a silicon doped Group III nitride semiconductor region with a dopant concentration of silicon being modulated in the Group III nitride semiconductor region. In addition, a semiconductor active region may be configured to generate light responsive to an electrical signal therethrough. Related methods, devices, and structures are also discussed.
    Type: Application
    Filed: December 16, 2009
    Publication date: June 16, 2011
    Inventors: Daniel Carleton Driscoll, Ashonita Chavan, Adam William Saxler