Patents by Inventor Kanwal K. Raina

Kanwal K. Raina 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: 6509686
    Abstract: Improved field emission display includes a buffer layer of copper, aluminum, silicon nitride or doped or undoped amorphous, poly, or microcrystalline silicon located between a chromium gate electrode and associated dielectric layer in a cathode assembly. The buffer layer substantially reduces or eliminates the occurrence of an adverse chemical reaction between the chromium gate electrode and dielectric layer.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: January 21, 2003
    Assignee: Micron Technology, Inc.
    Inventors: Behnam Moradi, Kanwal K. Raina, Michael J. Westphal
  • Publication number: 20020195924
    Abstract: This invention provides a conductive aluminum film and method of forming the same, wherein a non-conductive impurity is incorporated into the aluminum film. In one embodiment, the introduction of nitrogen creates an aluminum nitride subphase which pins down hillocks in the aluminum film to maintain a substantially smooth surface. The film remains substantially hillock-free even after subsequent thermal processing. The aluminum nitride subphase causes only a nominal increase in resistivity (resistivities remain below about 12 &mgr;&OHgr;-cm), thereby making the film suitable as an electrically conductive layer for integrated circuit or display devices.
    Type: Application
    Filed: July 19, 2002
    Publication date: December 26, 2002
    Inventor: Kanwal K. Raina
  • Publication number: 20020190387
    Abstract: An aluminum-containing film having an oxygen content within the film. The aluminum-containing film is formed by introducing hydrogen gas and oxygen gas along with argon gas into a sputter deposition vacuum chamber during the sputter deposition of aluminum or aluminum alloys onto a semiconductor substrate. The aluminum-containing film so formed is hillock-free and has low resistivity, relatively low roughness compared to pure aluminum, good mechanical strength, and low residual stress.
    Type: Application
    Filed: June 26, 2002
    Publication date: December 19, 2002
    Inventors: Kanwal K. Raina, David H. Wells
  • Patent number: 6461211
    Abstract: In one aspect, an electron emission device comprises a substrate, and a first layer supported by the substrate. The first layer comprises a conductive material. The electron emission display device further comprises an electron emission tip electrically connected with the first layer, and a second layer electrically disposed between the first layer and the electron emission tip. The second layer comprises microcrystalline silicon. In another aspect, the invention encompasses a method of forming an electron emission device. A substrate is provided, and a conductive layer is formed over the substrate. A microcrystalline-silicon-containing layer is formed over the conductive layer, and a resistor layer is formed over the microcrystalline-silicon-containing layer. An emitter tip is formed over the resistor layer. In yet other aspects, the invention encompasses field emission display devices, and methods of forming field emission display devices.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: October 8, 2002
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, Ammar Derraa
  • Publication number: 20020136830
    Abstract: A system and method for fabricating a FED device is disclosed. The system and method provide for use of PECVD hydrogenation followed by nitrogen plasma treatment of the tip of the current emitter of the FED device. The use of this process greatly reduces the native oxides in the tip of the current emitter. Such native oxides function as undesirable insulators degrading current emission. By reducing the amount of oxides in the tip, this invention provides for an increase in the current emission of the FED device.
    Type: Application
    Filed: April 12, 2002
    Publication date: September 26, 2002
    Inventor: Kanwal K. Raina
  • Patent number: 6455939
    Abstract: An aluminum-containing film having an oxygen content within the film. The aluminum-containing film is formed by introducing hydrogen gas and oxygen gas along with argon gas into a sputter deposition vacuum chamber during the sputter deposition of aluminum or aluminum alloys onto a semiconductor substrate. The aluminum-containing film so formed is hillock-free and has low resistivity, relatively low roughness compared to pure aluminum, good mechanical strength, and low residual stress.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: September 24, 2002
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, David H. Wells
  • Publication number: 20020119328
    Abstract: A system and method for fabricating a FED device is disclosed. The system and method provide for use of PECVD hydrogenation followed by nitrogen plasma treatment of the tip of the current emitter of the FED device. The use of this process greatly reduces the native oxides in the tip of the current emitter. Such native oxides function as undesirable insulators degrading current emission. By reducing the amount of oxides in the tip, this invention provides for an increase in the current emission of the FED device.
    Type: Application
    Filed: March 4, 2002
    Publication date: August 29, 2002
    Inventor: Kanwal K. Raina
  • Patent number: 6440505
    Abstract: The invention includes methods of treating sodalime glass surfaces for deposition of silicon nitride and methods of forming field emission display devices. In one aspect, the invention includes a method of treating a sodalime glass surface for deposition of silicon nitride comprising: a) cleaning a surface of the glass with detergent; and b) contacting the cleaned surface with a solution comprising a strong oxidant to remove non-silicon-dioxide materials from the surface and from a zone underlying and proximate the surface.
    Type: Grant
    Filed: November 6, 2000
    Date of Patent: August 27, 2002
    Assignee: Micron Technology, Inc.
    Inventor: Kanwal K. Raina
  • Patent number: 6425791
    Abstract: A field emission device is disclosed having a buffer layer positioned between an underlying cathode conductive layer and an overlying resistor layer. The buffer layer consists of substantially undoped amorphous silicon. Any pinhole defects or discontinuities that extend through the resistor layer terminate at the buffer layer, thereby preventing the problems otherwise caused by pinhole defects. In particular, the buffer layer prevents breakdown of the resistor layer, thereby reducing the possibility of short circuiting. The buffer layer further reduces the risk of delamination of various layers or other irregularities arising from subsequent processing steps. Also disclosed are methods of making and using the field emission device having the buffer layer.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: July 30, 2002
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, James J. Alwan
  • Publication number: 20020096993
    Abstract: This invention provides a conductive aluminum film and method of forming the same, wherein a non-conductive impurity is incorporated into the aluminum film. In one embodiment, the introduction of nitrogen creates an aluminum nitride subphase which pins down hillocks in the aluminum film to maintain a substantially smooth surface. The film remains substantially hillock-free even after subsequent thermal processing. The aluminum nitride subphase causes only a nominal increase in resistivity (resistivities remain below about 12 &mgr;&OHgr;-cm), thereby making the film suitable as an electrically conductive layer for integrated circuit or display devices.
    Type: Application
    Filed: January 29, 2002
    Publication date: July 25, 2002
    Inventor: Kanwal K. Raina
  • Patent number: 6348403
    Abstract: A multilayer structure is provided which suppresses hillock formation due to post-heat treatment steps in thin aluminum films deposited on other substrates by sandwiching the aluminum film between thin layers of aluminum titanium nitride. The first aluminum titanium nitride layer acts as a compatibilizing layer to provide a better match between the coefficients of thermal expansion of the substrate and aluminum metal layer. The second aluminum titanium nitride layer acts as a cap layer to suppress hillock formation.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: February 19, 2002
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, Tianhong Zhang, Allen McTeer
  • Publication number: 20010035706
    Abstract: In one aspect, an electron emission device comprises a substrate, and a first layer supported by the substrate. The first layer comprises a conductive material. The electron emission display device further comprises an electron emission tip electrically connected with the first layer, and a second layer electrically disposed between the first layer and the electron emission tip. The second layer comprises microcrystalline silicon. In another aspect, the invention encompasses a method of forming an electron emission device. A substrate is provided, and a conductive layer is formed over the substrate. A microcrystalline-silicon-containing layer is formed over the conductive layer, and a resistor layer is formed over the microcrystalline-silicon-containing layer. An emitter tip is formed over the resistor layer. In yet other aspects, the invention encompasses field emission display devices, and methods of forming field emission display devices.
    Type: Application
    Filed: June 22, 2001
    Publication date: November 1, 2001
    Inventors: Kanwal K. Raina, Ammar Derraa
  • Patent number: 6264750
    Abstract: A method for forming SbSI thin films is formed. In the first step of the method, a substrate (14) is provided. Next a buffer layer (16) is formed on the substrate (14). Then, a SbSI source (12) is provided. The SbSI source (12) and buffer layer (16) with substrate (14) are placed in an ampoule (10). The ampoule is heated in a two-zone furnace (11). This causes the SbSI source (12) to form a vapor which reacts with the buffer layer (14) to form a thin film of SbSI.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: July 24, 2001
    Assignee: The Texas A&M University System
    Inventors: Raghvendra K. Pandey, Kanwal K. Raina, Narayanan Solayappan
  • Patent number: 6239548
    Abstract: The present disclosure describes microelectronic substrate assemblies, and methods for making and using such substrate assemblies in mechanical and chemical-mechanical planarizing processes. A microelectronic substrate assembly is fabricated in accordance with one aspect of the invention by forming a critical layer in a film stack on the substrate and manipulating the critical layer to have a low compression internal stress. The critical layer, more specifically, is a layer that is otherwise in a tensile state or a high compression state without being manipulated to control the internal stress in the critical layer to be in a low compression state. The stress in the critical layer can be manipulated by changing the chemistry, temperature or energy level of the process used to deposit or otherwise form the critical layer. The stress in the critical layer can also be manipulated using heat treatments and other processes.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: May 29, 2001
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, James J. Alwan
  • Patent number: 6222271
    Abstract: Aluminum containing films having an oxygen content within the films. The aluminum-containing film is formed by introducing hydrogen gas along with argon gas into a sputter deposition vacuum chamber during the sputter deposition of aluminum or aluminum alloys onto a semiconductor substrate. The aluminum-containing film so formed is hillock-free and has low resistivity, relatively low roughness compared to pure aluminum, good mechanical strength, and low residual stress.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: April 24, 2001
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, David H. Wells
  • Patent number: 6211608
    Abstract: A field emission device is disclosed having a buffer layer positioned between an underlying cathode conductive layer and an overlying resistor layer. The buffer layer consists of substantially undoped amorphous silicon. Any pinhole defects or discontinuities that extend through the resistor layer terminate at the buffer layer, thereby preventing the problems otherwise caused by pinhole defects. In particular, the buffer layer prevents breakdown of the resistor layer, thereby reducing the possibility of short circuiting. The buffer layer further reduces the risk of delamination of various layers or other irregularities arising from subsequent processing steps. Also disclosed are methods of making and using the field emission device having the buffer layer.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: April 3, 2001
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, James J. Alwan
  • Patent number: 6194783
    Abstract: Aluminum-containing films having an oxygen content within the films. The aluminum-containing film is formed by introducing hydrogen gas along with argon gas into a sputter deposition vacuum chamber during the sputter deposition of aluminum or aluminum alloys onto a semiconductor substrate. The aluminum-containing film so formed is hillock-free and has low resistivity, relatively low roughness compared to pure aluminum, good mechanical strength, and low residual stress.
    Type: Grant
    Filed: October 23, 1998
    Date of Patent: February 27, 2001
    Assignee: Micron Technology, Inc.
    Inventor: Kanwal K. Raina
  • Patent number: 6165568
    Abstract: The invention includes methods of treating sodalime glass surfaces for deposition of silicon nitride and methods of forming field emission display devices. In one aspect, the invention includes a method of treating a sodalime glass surface for deposition of silicon nitride comprising: a) cleaning a surface of the glass with detergent; and b) contacting the cleaned surface with a solution comprising a strong oxidant to remove non-silicon-dioxide materials from the surface and from a zone underlying and proximate the surface.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: December 26, 2000
    Assignee: Micron Technology, Inc.
    Inventor: Kanwal K. Raina
  • Patent number: 6153262
    Abstract: A method for forming SbSI thin films is formed. In the first step of the method, a substrate (14) is provided. Next a buffer layer (16) is formed on the substrate (14). Then, a SbSI source (12) is provided. The SbSI source (12) and buffer layer (16) with substrate (14) are placed in an ampoule (10). The ampoule is heated in a two-zone furnace (11). This causes the SbSI source (12) to form a vapor which reacts with the buffer layer (14) to form a thin film of SbSI.
    Type: Grant
    Filed: February 18, 1999
    Date of Patent: November 28, 2000
    Assignee: The Texas A&M University System
    Inventors: Raghvendra K. Pandey, Kanwal K. Raina, Narayanan Solayappan
  • Patent number: 6140701
    Abstract: A multilayer structure is provided which suppresses hillock formation due to post-heat treatment steps in thin aluminum films deposited on other substrates by sandwiching the aluminum film between thin layers of aluminum titanium nitride. The first aluminum titanium nitride layer acts as a compatibilizing layer to provide a better match between the coefficients of thermal expansion of the substrate and aluminum metal layer. The second aluminum titanium nitride layer acts as a cap layer to suppress hillock formation.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: October 31, 2000
    Assignee: Micron Technology, Inc.
    Inventors: Kanwal K. Raina, Tianhong Zhang, Allen McTeer