Patents by Inventor Vishnu K

Vishnu K 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: 20080113498
    Abstract: Methods and apparatus are provided for semiconductor device (60, 95, 100, 106). The semiconductor device (60, 95, 100, 106), comprises a first region (64, 70) of a first conductivity type extending to a first surface (80), a second region (66) of a second, opposite, conductivity type forming with the first region (70) a first PN junction (65) extending to the first surface (80), a contact region (68) of the second conductivity type in the second region (66) at the first surface (80) and spaced apart from the first PN junction (65) by a first distance (LDS), and a third region (82, 96-98, 108) of the first conductivity type and of a second length (LBR), underlying the second region (66) and forming a second PN junction (63) therewith spaced apart from the first surface (80) and located closer to the first PN junction (65) than to the contact region (68). The breakdown voltage is enhanced without degrading other useful properties of the device (60, 95, 100, 106).
    Type: Application
    Filed: November 15, 2006
    Publication date: May 15, 2008
    Inventors: Vishnu K. Khemka, Amitava Bose, Todd C. Roggenbauer, Ronghua Zhu
  • Patent number: 7359607
    Abstract: A waveguide and resonator are formed on a lower cladding of a thermo optic device, each having a formation height that is substantially equal. Thereafter, the formation height of the waveguide is attenuated. In this manner, the aspect ratio as between the waveguide and resonator in an area where the waveguide and resonator front or face one another decreases (in comparison to the prior art) thereby restoring the synchronicity between the waveguide and the grating and allowing higher bandwidth configurations to be used. The waveguide attenuation is achieved by photomasking and etching the waveguide after the resonator and waveguide are formed. In one embodiment the photomasking and etching is performed after deposition of the upper cladding. In another, it is performed before the deposition. Thermo optic devices, thermo optic packages and fiber optic systems having these waveguides are also taught.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: April 15, 2008
    Assignee: Micron Technology, Inc.
    Inventors: Guy T. Blalock, Howard E. Rhodes, Vishnu K. Agarwal, Gurtej Singh Sandhu, James S. Foresi, Jean-Francois Viens, Dale G. Fried
  • Patent number: 7355260
    Abstract: A conductive layer includes a first portion that forms a Schottky region with an underlying first region having a first conductivity type. A second region of a second conductivity type underlies the first region, where the second conductivity type is opposite the first conductivity type. A third region of the first conductivity type immediately underlies the second region and is electrically coupled to a cathode of the device.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: April 8, 2008
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Vishnu K. Khemka, Vijay Parthasarathy, Ronghua Zhu, Amitava Bose
  • Publication number: 20080079122
    Abstract: A semiconductor device 10 is provided. A first layer 12 has a first dopant type; a second layer 14 is provided over the first layer 12; and a third layer 16 is provided over the second layer and has the first dopant type. A plurality of first and second semiconductor regions 22, 24 are within the third layer. The first semiconductor region 22 has the first dopant type, and the second semiconductor region 24 has the second dopant type. The first and second semiconductor regions 22, 24 are disposed laterally to one another in an alternating pattern to form a super junction, and the super junction terminates with a final second semiconductor region 24, 24? of the second dopant type.
    Type: Application
    Filed: September 29, 2006
    Publication date: April 3, 2008
    Inventors: Ronghua Zhu, Amitava Bose, Vishnu K. Khemka, Todd C. Roggenbauer
  • Patent number: 7329566
    Abstract: A semiconductor component and method of manufacture, including an insulated gate bipolar transistor (IGBT) (100, 200) that includes a semiconductor substrate (110) having a first conductivity type and buried semiconductor region (115) having a second conductivity type located above the semiconductor substrate. The IGBT further includes a first semiconductor region (120) having the first conductivity type located above the buried semiconductor region, a second semiconductor region (130) having the second conductivity type located above at least a portion of the first semiconductor region, an emitter (150) having the second conductivity type disposed in the second semiconductor region, and a collector (170) having the second conductivity type disposed in the first semiconductor region. A sinker region (140) is provided to electrically tie the buried semiconductor region (115) to the second semiconductor region (130).
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: February 12, 2008
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Vishnu K. Khemka, Amitava Bose, Ronghua Zhu
  • Patent number: 7288808
    Abstract: A capacitor fabrication method may include forming a first capacitor electrode over a substrate, the first electrode having an inner surface area per unit area and an outer surface area per unit area that are both greater than an outer surface area per unit area of the substrate. A capacitor dielectric layer and a second capacitor electrode may be formed over the dielectric layer. The method may further include forming rugged polysilicon over the substrate, the first electrode being over the rugged polysilicon. Accordingly, the outer surface area of the first electrode can be at least 30% greater than the outer surface area of the substrate without the first electrode including polysilicon.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: October 30, 2007
    Assignee: Micron Technology, Inc.
    Inventors: Vishnu K. Agarwal, Garry A. Mercaldi
  • Patent number: 7282666
    Abstract: A material processing system and method is disclosed for processing materials such as amorphous silicon in an annealing processes and lithography processes on a silicon wafer, as well as ablation processes. A first laser generates periodic pulses of radiation along a beam path directed at the target material. Similarly, at least one additional laser generates periodic pulses. A beam aligner redirects the beam path of the at least one laser, such that the beam from the at least one additional laser is directed at the target along a path colinear with the first laser's beam path. As a result, all the lasers are directed at the target along the same combined beam path. The periodic pulses of the at least one additional laser are delayed relative to the first laser such that multiple pulses impinge on the target within a single pulse cycle of any given laser.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: October 16, 2007
    Assignee: Micron Technology, Inc.
    Inventors: Vishnu K. Agarwal, William A. Stanton
  • Patent number: 7282756
    Abstract: Structurally-stable, tall capacitors having unique three-dimensional architectures for semiconductor devices are disclosed. The capacitors include monolithically-fabricated upright microstructures, i.e., those having large height/width (H/W) ratios, which are mechanical reinforcement against shear forces and the like, by a brace layer that transversely extends between lateral sides of at least two of the free-standing microstructures. The brace layer is formed as a microbridge type structure spanning between the upper ends of the two or more microstructures.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: October 16, 2007
    Assignee: Micron Technology Inc.
    Inventors: Vishnu K. Agarwal, Gurtej Sandhu
  • Patent number: 7282386
    Abstract: A Schottky device having a plurality of unit cells, each having a Schottky contact portion, surrounded by a termination structure that causes depletion regions to form in a vertical and horizontal direction, relative to a surface of the device, during a reverse bias voltage condition.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: October 16, 2007
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Vishnu K. Khemka, Vijay Parthasarathy, Ronghua Zhu, Amitava Bose
  • Patent number: 7274838
    Abstract: The present technique relates to a method for fabricating an optical integrated circuit amplifier with another type of optical integrated circuit. In optical networks, optical components exchange optical signals to communicate between different systems coupled to the optical components. The optical components may include optical integrated circuit amplifiers and other optical integrated circuits coupled together through optical paths. The optical integrated circuit amplifiers and other optical integrated circuits of the optical components are fabricated on the same substrate to reduce the cost of fabrication, maintenance and installation, while enhancing the performance of the optical component.
    Type: Grant
    Filed: June 16, 2006
    Date of Patent: September 25, 2007
    Assignee: Micron Technology, Inc.
    Inventor: Vishnu K. Agarwal
  • Patent number: 7271092
    Abstract: A diffusion barrier layer comprising TiNxBy is disclosed for protection of gate oxide layers in integrated transistors. The diffusion barrier layer can be fabricated by first forming a TiN layer and then incorporating boron into the TiN layer. The diffusion barrier layer can also be fabricated by forming a TiNxBy layer using a TDMAT process including boron. The diffusion barrier layer can also be fabricated by forming a TiNxBy layer using a CVD process. The diffusion barrier layer is of particular utility in conjunction with tungsten or tungsten silicide conductive layers formed by CVD.
    Type: Grant
    Filed: April 29, 2005
    Date of Patent: September 18, 2007
    Assignee: Micron Technology, Inc.
    Inventors: Vishnu K. Agarwal, Gurtej S. Sandhu
  • Patent number: 7268072
    Abstract: An intermediate metal plug is used to raise the platform to which contact is to be made. In the illustrated process, a partial bit line plug is formed adjacent a stacked capacitor, and an interlevel dielectric formed over the capacitor. The bit line contact is completed by extending a via from the bit line, formed above the interlevel dielectric, down to the level of the intermediate plug, and the via is filled with metal. The height of the via to be filled is thus reduced by the height of the intermediate plug. In one embodiment, the intermediate plug is slightly shorter than an adjacent container-shaped capacitor. In another embodiment, the intermediate plug is about as high as an adjacent stud capacitor.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: September 11, 2007
    Assignee: Micron Technology, Inc.
    Inventors: Scott J. Deboer, Vishnu K. Agarwal
  • Patent number: 7253076
    Abstract: Capacitors having increased capacitance include an enhanced-surface-area (rough-surfaced) electrically conductive layer or other layers that are compatible with the high-dielectric constant materials. In one approach, an enhanced-surface-area electrically conductive layer for such capacitors is formed by processing a ruthenium oxide layer at high temperature at or above 500° C. and low pressure 75 torr or below, most desirably 5 torr or below, to produce a roughened ruthenium layer having a textured surface with a mean feature size of at least about 100 Angstroms. The initial ruthenium oxide layer may be provided by chemical vapor deposition techniques or sputtering techniques or the like. The layer may be formed over an underlying electrically conductive layer. The processing may be performed in an inert ambient or in a reducing ambient.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: August 7, 2007
    Assignee: Micron Technologies, Inc.
    Inventors: Vishnu K. Agarwal, Garo Derderian, Gurtej S. Sandhu, Weimin M. Li, Mark Visokay, Cem Basceri, Sam Yang
  • Patent number: 7251387
    Abstract: The present technique relates to a method and apparatus for fabricating an optical integrated circuit amplifier with another type of optical integrated circuit. In optical networks, optical components exchange optical signals to communicate between different systems coupled to the optical components. The optical components may include optical integrated circuit amplifiers and other optical integrated circuits coupled together through optical paths. The optical integrated circuit amplifiers and other optical integrated circuits of the optical components are fabricated on the same substrate to reduce the cost of fabrication, maintenance and installation, while enhancing the performance of the optical component.
    Type: Grant
    Filed: July 19, 2004
    Date of Patent: July 31, 2007
    Assignee: Micron Technology, Inc.
    Inventor: Vishnu K. Agarwal
  • Patent number: 7244989
    Abstract: A semiconductor component and method of manufacture, including an insulated gate bipolar transistor (IGBT) (100, 200, 300, 400) that includes a semiconductor substrate (110, 210, 310, 410) having a first conductivity type and buried semiconductor region (115, 215, 315, 415) having a second conductivity type located above the semiconductor substrate. The IGBT further includes a first semiconductor region (120, 220, 320, 420) having the first conductivity type located above the buried semiconductor region, a second semiconductor region (130, 230, 330, 430) having the first conductivity type located above the first semiconductor region, a third semiconductor region (140, 240, 340, 440) having the second conductivity type located above the first semiconductor region, an emitter (150, 250, 350, 450) having the first conductivity type disposed in the third semiconductor region, and a collector (170, 270, 370, 470) having the first conductivity type disposed in the third semiconductor region.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: July 17, 2007
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Vishnu K. Khemka, Amitava Bose, Ronghua Zhu
  • Patent number: 7238616
    Abstract: The present invention provides a processing system comprising a remote plasma activation region for formation of active gas species, a transparent transfer tube coupled between the remote activation region and a semiconductor processing chamber, and a source of photo-energy for maintaining activation of the active species or providing photo-energy for a non-plasma species during transfer through the transparent tube to the processing chamber. The source of photo-energy preferably includes an array of UV lamps. Additional UV lamps may also be used to further sustain active species and assist processes by providing additional in-situ energy through a transparent window of the processing chamber. The system can be utilized for processes such as layer-by-layer annealing and deposition and also removal of contaminants from deposited layers.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: July 3, 2007
    Assignee: Micron Technology, Inc.
    Inventor: Vishnu K. Agarwal
  • Patent number: 7232721
    Abstract: Systems, devices, structures, and methods are described that inhibit dielectric degradation at high temperatures. An enhanced capacitor is discussed. The enhanced capacitor includes a first electrode, a dielectric that includes ditantalum pentaoxide, and a second electrode having a compound. The compound includes a first substance and a second substance. The second electrode includes a trace amount of the first substance. The morphology of the semiconductor structure remains stable when the trace amount of the first substance is oxidized during crystallization of the dielectric. In one embodiment, the crystalline structure of the dielectric describes substantially a (001) lattice plane.
    Type: Grant
    Filed: August 31, 2004
    Date of Patent: June 19, 2007
    Assignee: Micron Technology, Inc.
    Inventors: Cem Basceri, Vishnu K. Agarwal, Dan Gealy
  • Patent number: 7229338
    Abstract: Planarizing machines, planarizing pads, and methods for planarizing or endpointing mechanical and/or chemical-mechanical planarization of microelectronic substrates. One particular embodiment is a planarizing machine that controls the movement of a planarizing pad along a pad travel path to provide optical analysis of a substrate assembly during a planarizing cycle. The planarizing machine can include a table having an optical opening at an illumination site in a planarizing zone and a light source aligned with the illumination site to direct a light beam through the optical opening in the table. The planarizing machine can further include a planarizing pad and a pad advancing mechanism. The planarizing pad has a planarizing medium and at least one optically transmissive window along the pad travel path. The pad advancing mechanism has an actuator system coupled to the pad and a position monitor coupled to the actuator system.
    Type: Grant
    Filed: August 3, 2005
    Date of Patent: June 12, 2007
    Assignee: Micron Technology, Inc.
    Inventor: Vishnu K. Agarwal
  • Patent number: 7205600
    Abstract: A capacitor forming method can include forming an insulation layer over a substrate and forming a barrier layer to threshold voltage shift inducing material over the substrate. An opening can be formed at least into the insulation layer and a capacitor dielectric layer formed at least within the opening. Threshold voltage inducing material can be provided over the barrier layer but be retarded in movement into an electronic device comprised by the substrate. The dielectric layer can comprise a tantalum oxide and the barrier layer can include a silicon nitride. Providing threshold voltage shift inducing material can include oxide annealing dielectric layer such as with N2O. The barrier layer can be formed over the insulation layer, the insulation layer can be formed over the barrier layer, or the barrier layer can be formed over a first insulation layer with a second insulation layer formed over the barrier layer.
    Type: Grant
    Filed: August 19, 2002
    Date of Patent: April 17, 2007
    Assignee: Micron Technology, Inc.
    Inventors: Vishnu K. Agarwal, F. Daniel Gealy, Kunal R. Parekh, Randhir P. S. Thakur
  • Patent number: 7180158
    Abstract: A semiconductor component and method of manufacture, including an insulated gate bipolar transistor (IGBT) (100) including a semiconductor substrate (110) having a first conductivity type and buried semiconductor region (115) having a second conductivity type located above the semiconductor substrate. The IGBT further includes a plurality of first semiconductor regions (120) having the first conductivity type, a plurality of second semiconductor regions (130) having the first conductivity type, and a plurality of third semiconductor regions (140) having the second conductivity type. A sinker region (142) having the second conductivity type is disposed in a third semiconductor region and a first semiconductor region during manufacture to define the plurality of regions and tie the buried semiconductor region to the plurality of third semiconductor regions.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: February 20, 2007
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Vishnu K. Khemka, Amitava Bose, Ronghua Zhu