Patents by Inventor Wonill Ha

Wonill Ha 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: 20080157060
    Abstract: A semiconductor device having multiple lateral channels with contacts on opposing surfaces thereof and a method of forming the same. In one embodiment, the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof. The semiconductor device also includes a first lateral channel above the conductive substrate and a second lateral channel above the first lateral channel. The semiconductor device further includes a second contact above the second lateral channel. The semiconductor device still further includes an interconnect that connects the first and second lateral channels to the conductive substrate operable to provide a low resistance coupling between the first contact and the first and second lateral channels.
    Type: Application
    Filed: February 21, 2008
    Publication date: July 3, 2008
    Inventors: Berinder P. S. Brar, Wonill Ha
  • Publication number: 20080054304
    Abstract: A semiconductor device including a lateral field-effect transistor and Schottky diode and method of forming the same. In one embodiment, the lateral field-effect transistor includes a buffer layer having a contact covering a substantial portion of a bottom surface thereof, a lateral channel above the buffer layer, another contact above the lateral channel, and an interconnect that connects the lateral channel to the buffer layer. The semiconductor device also includes a Schottky diode parallel-coupled to the lateral field-effect transistor including a cathode formed from another buffer layer interposed between the buffer layer and the lateral channel, a Schottky interconnect interposed between the another buffer layer and the another contact, and an anode formed on a surface of the Schottky interconnect operable to connect the anode to the another contact. The semiconductor device may also include an isolation layer interposed between the buffer layer and the lateral channel.
    Type: Application
    Filed: October 2, 2007
    Publication date: March 6, 2008
    Inventors: Mariam Sadaka, Berinder Brar, Wonill Ha, Chanh Nguyen
  • Patent number: 7339208
    Abstract: A semiconductor device having multiple lateral channels with contacts on opposing surfaces thereof and a method of forming the same. In one embodiment, the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof. The semiconductor device also includes a first lateral channel above the conductive substrate and a second lateral channel above the first lateral channel. The semiconductor device further includes a second contact above the second lateral channel. The semiconductor device still further includes an interconnect that connects the first and second lateral channels to the conductive substrate operable to provide a low resistance coupling between the first contact and the first and second lateral channels.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: March 4, 2008
    Assignee: ColdWatt, Inc.
    Inventors: Berinder P. S. Brar, Wonill Ha
  • Publication number: 20080048219
    Abstract: A semiconductor device including a substrate-driven field-effect transistor with a lateral channel and a parallel-coupled Schottky diode, and a method of forming the same. In one embodiment, the substrate-driven field-effect transistor of the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof, and a lateral channel above the conductive substrate. The substrate-driven field-effect transistor also includes a second contact above the lateral channel and an interconnect that connects the lateral channel to the conductive substrate operable to provide a low resistance coupling between the first contact and the lateral channel. The semiconductor device also includes a Schottky diode parallel-coupled to the substrate-driven field-effect transistor. A first and second terminal of the Schottky diode are couplable to the first and second contacts, respectively, of the substrate drive field-effect transistor.
    Type: Application
    Filed: October 22, 2007
    Publication date: February 28, 2008
    Inventors: Berinder Brar, Wonill Ha
  • Publication number: 20080048173
    Abstract: A semiconductor device including a lateral field-effect transistor and Schottky diode and method of forming the same. In one embodiment, the lateral field-effect transistor includes a buffer layer having a contact covering a substantial portion of a bottom surface thereof, a lateral channel above the buffer layer, another contact above the lateral channel, and an interconnect that connects the lateral channel to the buffer layer. The semiconductor device also includes a Schottky diode parallel-coupled to the lateral field-effect transistor including a cathode formed from another buffer layer interposed between the buffer layer and the lateral channel, a Schottky interconnect interposed between the another buffer layer and the another contact, and an anode formed on a surface of the Schottky interconnect operable to connect the anode to the another contact. The semiconductor device may also include an isolation layer interposed between the buffer layer and the lateral channel.
    Type: Application
    Filed: October 2, 2007
    Publication date: February 28, 2008
    Inventors: Mariam Sadaka, Berinder Brar, Wonill Ha, Chanh Nguyen
  • Publication number: 20080048174
    Abstract: A semiconductor device including a lateral field-effect transistor and Schottky diode and method of forming the same. In one embodiment, the lateral field-effect transistor includes a buffer layer having a contact covering a substantial portion of a bottom surface thereof, a lateral channel above the buffer layer, another contact above the lateral channel, and an interconnect that connects the lateral channel to the buffer layer. The semiconductor device also includes a Schottky diode parallel-coupled to the lateral field-effect transistor including a cathode formed from another buffer layer interposed between the buffer layer and the lateral channel, a Schottky interconnect interposed between the another buffer layer and the another contact, and an anode formed on a surface of the Schottky interconnect operable to connect the anode to the another contact. The semiconductor device may also include an isolation layer interposed between the buffer layer and the lateral channel.
    Type: Application
    Filed: October 2, 2007
    Publication date: February 28, 2008
    Inventors: Mariam Sadaka, Berinder Brar, Wonill Ha, Chanh Nguyen
  • Publication number: 20070298564
    Abstract: A semiconductor device, a method of forming the same, and a power converter including the semiconductor device. In one embodiment, the semiconductor device includes a heavily doped substrate, a source/drain contact below the heavily doped substrate, and a channel layer above the heavily doped substrate. The semiconductor device also includes a heavily doped source/drain layer above the channel layer and another source/drain contact above the heavily doped source/drain layer. The semiconductor device further includes pillar regions through the another source/drain contact, the heavily doped source/drain layer, and portions of the channel layer to form a vertical cell therebetween. Non-conductive regions of the semiconductor device are located in the portions of the channel layer within the pillar regions. The semiconductor device still further includes a gate above the non-conductive regions in the pillar regions.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 27, 2007
    Inventors: Berinder P. S. Brar, Wonill Ha
  • Publication number: 20070298559
    Abstract: A semiconductor device, a method of forming the same, and a power converter including the semiconductor device. In one embodiment, the semiconductor device includes a heavily doped substrate, a source/drain contact below the heavily doped substrate, and a channel layer above the heavily doped substrate. The semiconductor device also includes a heavily doped source/drain layer above the channel layer and another source/drain contact above the heavily doped source/drain layer. The semiconductor device further includes pillar regions through the another source/drain contact, the heavily doped source/drain layer, and portions of the channel layer to form a vertical cell therebetween. Non-conductive regions of the semiconductor device are located in the portions of the channel layer within the pillar regions. The semiconductor device still further includes a gate above the non-conductive regions in the pillar regions.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 27, 2007
    Inventors: Berinder P. S. Brar, Wonill Ha
  • Publication number: 20070296028
    Abstract: A semiconductor device, a method of forming the same, and a power converter including the semiconductor device. In one embodiment, the semiconductor device includes a heavily doped substrate, a source/drain contact below the heavily doped substrate, and a channel layer above the heavily doped substrate. The semiconductor device also includes a heavily doped source/drain layer above the channel layer and another source/drain contact above the heavily doped source/drain layer. The semiconductor device further includes pillar regions through the another source/drain contact, the heavily doped source/drain layer, and portions of the channel layer to form a vertical cell therebetween. Non-conductive regions of the semiconductor device are located in the portions of the channel layer within the pillar regions. The semiconductor device still further includes a gate above the non-conductive regions in the pillar regions.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 27, 2007
    Inventors: Berinder P. S. Brar, Wonill Ha
  • Patent number: 7285807
    Abstract: A semiconductor device including a substrate driven field-effect transistor with a lateral channel and a parallel-coupled Schottky diode, and a method of forming the same. In one embodiment, the substrate driven field-effect transistor of the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof, and a lateral channel above the conductive substrate. The substrate driven field-effect transistor also includes a second contact above the lateral channel and an interconnect that connects the lateral channel to the conductive substrate operable to provide a low resistance coupling between the first contact and the lateral channel. The semiconductor device also includes a Schottky diode parallel-coupled to the substrate driven field-effect transistor. A first and second terminal of the Schottky diode are couplable to the first and second contacts, respectively, of the substrate drive field-effect transistor.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: October 23, 2007
    Assignee: ColdWatt, Inc.
    Inventors: Berinder P. S. Brar, Wonill Ha
  • Publication number: 20070187717
    Abstract: A semiconductor device and method of forming the same. The semiconductor device includes an epitaxially grown and conductive buffer layer having a contact covering a substantial portion of a bottom surface thereof and a lateral channel above the buffer layer. The semiconductor device also includes another contact above the lateral channel and an interconnect that connects the lateral channel to the buffer layer, operable to provide a low resistance coupling between the contact and the lateral channel.
    Type: Application
    Filed: April 3, 2007
    Publication date: August 16, 2007
    Inventors: Mariam Sadaka, Berinder Brar, Wonill Ha, Chanh Nguyen
  • Publication number: 20070145417
    Abstract: A semiconductor device having a lateral channel with contacts on opposing surfaces thereof. The semiconductor device includes a conductive substrate having a source contact covering a substantial portion of a bottom surface thereof. The semiconductor device also includes an isolation layer above the conductive substrate, a lateral channel above the isolation layer and a drain contact above the lateral channel. The semiconductor device further includes a gate located in a gate recess interposed between the lateral channel and the drain contact and a drain formed by at least one source/drain contact layer interposed between the lateral channel and the drain contact. The drain is offset on one side of the gate by a gate-to-drain separation distance. The semiconductor device still further includes an interconnect that connects the lateral channel to the conductive substrate operable to provide a low resistance coupling between the source contact and the lateral channel.
    Type: Application
    Filed: February 27, 2007
    Publication date: June 28, 2007
    Inventors: Berinder Brar, Wonill Ha, Mariam Sadaka, Chanh Nguyen
  • Publication number: 20070069286
    Abstract: A semiconductor device having at least one lateral channel with contacts on opposing surfaces thereof and a method of forming the same. In one embodiment, the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof. The semiconductor device also includes a lateral channel above the conductive substrate. The semiconductor device further includes a second contact above the lateral channel. The semiconductor device still further includes an interconnect having a sloped wall that connects the lateral channel to the conductive substrate. The interconnect is operable to provide a low resistance coupling between the first contact and the lateral channel. In a related but alternative embodiment, the first contact is a source contact and the second contact is a drain contact for the semiconductor device.
    Type: Application
    Filed: September 27, 2005
    Publication date: March 29, 2007
    Inventors: Berinder Brar, Wonill Ha, James Vorhaus
  • Publication number: 20070045765
    Abstract: A semiconductor device including a substrate driven field-effect transistor with a lateral channel and a parallel-coupled Schottky diode, and a method of forming the same. In one embodiment, the substrate driven field-effect transistor of the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof, and a lateral channel above the conductive substrate. The substrate driven field-effect transistor also includes a second contact above the lateral channel and an interconnect that connects the lateral channel to the conductive substrate operable to provide a low resistance coupling between the first contact and the lateral channel. The semiconductor device also includes a Schottky diode parallel-coupled to the substrate driven field-effect transistor. A first and second terminal of the Schottky diode are couplable to the first and second contacts, respectively, of the substrate drive field-effect transistor.
    Type: Application
    Filed: August 25, 2005
    Publication date: March 1, 2007
    Inventors: Berinder Brar, Wonill Ha
  • Publication number: 20060255360
    Abstract: A semiconductor device having multiple lateral channels with contacts on opposing surfaces thereof and a method of forming the same. In one embodiment, the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof. The semiconductor device also includes a first lateral channel above the conductive substrate and a second lateral channel above the first lateral channel. The semiconductor device further includes a second contact above the second lateral channel. The semiconductor device still further includes an interconnect that connects the first and second lateral channels to the conductive substrate operable to provide a low resistance coupling between the first contact and the first and second lateral channels.
    Type: Application
    Filed: May 13, 2005
    Publication date: November 16, 2006
    Inventors: Berinder Brar, Wonill Ha
  • Publication number: 20060226478
    Abstract: A semiconductor device having a lateral channel with contacts on opposing surfaces thereof and a method of forming the same. In one embodiment, the semiconductor device includes a conductive substrate having a first contact covering a substantial portion of a bottom surface thereof. The semiconductor device also includes a lateral channel above the conductive substrate. The semiconductor device further includes a second contact above the lateral channel. The semiconductor device still further includes an interconnect that connects the lateral channel to the conductive substrate. The interconnect is operable to provide a low resistance coupling between the first contact and the lateral channel.
    Type: Application
    Filed: March 29, 2005
    Publication date: October 12, 2006
    Inventors: Berinder Brar, Wonill Ha
  • Publication number: 20060039432
    Abstract: In connection with an optical-electronic semiconductor device, improved photoluminescent output is provided at wavelengths approaching and beyond 1.3 ?m. According to one aspect, a multiple quantum well strain compensated structure is formed using a GaInNAs-based quantum well laser diode with GaNAs-based barrier layers. By growing tensile-strained GaNAs barrier layers, a larger active region with multiple quantum wells can be formed increasing the optical gain of the device. In example implementations, both edge emitting laser devices and vertical cavity surface emitting laser (VCSEL) devices can be grown with at least several quantum wells, for example, nine quantum wells, and with room temperature emission approaching and beyond 1.3 ?m.
    Type: Application
    Filed: December 30, 2004
    Publication date: February 23, 2006
    Inventors: Wonill Ha, Vincent Gambin, James Harris
  • Patent number: 6798809
    Abstract: In connection with an optical-electronic semiconductor device, improved photoluminescent output is provided at wavelengths beyond 1.3 m. According to one aspect, Sb is used in, e.g. the active region of a GaInNAs-based quantum well laser diode with GaNAs-based barrier layers. Adding a small amount of Sb increases photoluminescence of the device while increasing the wavelength. Sb is used both as a surfactant, improving N and In incorporation into the active region, and an alloy constituent for red-shifting the wavelength of the device. In example implementations, both edge emitting laser devices and vertical cavity surface emitting laser (VCSEL) devices can be grown with room temperature emission from 1.3 to 1.6 &mgr;m.
    Type: Grant
    Filed: July 16, 2002
    Date of Patent: September 28, 2004
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Vincent Gambin, Wonill Ha, James S. Harris