Patents by Inventor Ritwik Bhatia

Ritwik Bhatia 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: 10090153
    Abstract: Method and devices are disclosed for device manufacture of gallium nitride devices by growing a gallium nitride layer on a silicon substrate using Atomic Layer Deposition (ALD) followed by rapid thermal annealing. Gallium nitride is grown directly on silicon or on a barrier layer of aluminum nitride grown on the silicon substrate. One or both layers are thermally processed by rapid thermal annealing. Preferably the ALD process use a reaction temperature below 550° C. and preferable below 350° C. The rapid thermal annealing step raises the temperature of the coating surface to a temperature ranging from 550 to 1500° C. for less than 12 msec.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: October 2, 2018
    Assignee: Ultratech, Inc.
    Inventors: Andrew M. Hawryluk, Ganesh Sundaram, Ritwik Bhatia
  • Patent number: 9929011
    Abstract: Method and devices are disclosed for device manufacture of gallium nitride devices by growing a gallium nitride layer on a silicon substrate using Atomic Layer Deposition (ALD) followed by rapid thermal annealing. Gallium nitride is grown directly on silicon or on a barrier layer of aluminum nitride grown on the silicon substrate. One or both layers are thermally processed by rapid thermal annealing. Preferably the ALD process use a reaction temperature below 550° C. and preferable below 350° C. The rapid thermal annealing step raises the temperature of the coating surface to a temperature ranging from 550 to 1500° C. for less than 12 msec.
    Type: Grant
    Filed: May 17, 2017
    Date of Patent: March 27, 2018
    Assignee: Ultratech, Inc.
    Inventors: Andrew M. Hawryluk, Ganesh Sundaram, Ritwik Bhatia
  • Patent number: 9768016
    Abstract: Method and devices are disclosed for device manufacture of gallium nitride devices by growing a gallium nitride layer on a silicon substrate using Atomic Layer Deposition (ALD) followed by rapid thermal annealing. Gallium nitride is grown directly on silicon or on a barrier layer of aluminum nitride grown on the silicon substrate. One or both layers are thermally processed by rapid thermal annealing. Preferably the ALD process use a reaction temperature below 550° C. and preferable below 350° C. The rapid thermal annealing step raises the temperature of the coating surface to a temperature ranging from 550 to 1500° C. for less than 12 msec.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: September 19, 2017
    Assignee: Ultratech, Inc.
    Inventors: Andrew M. Hawryluk, Ganesh Sundaram, Ritwik Bhatia
  • Publication number: 20170256394
    Abstract: Method and devices are disclosed for device manufacture of gallium nitride devices by growing a gallium nitride layer on a silicon substrate using Atomic Layer Deposition (ALD) followed by rapid thermal annealing. Gallium nitride is grown directly on silicon or on a barrier layer of aluminum nitride grown on the silicon substrate. One or both layers are thermally processed by rapid thermal annealing. Preferably the ALD process use a reaction temperature below 550° C. and preferable below 350° C. The rapid thermal annealing step raises the temperature of the coating surface to a temperature ranging from 550 to 1500° C. for less than 12 msec.
    Type: Application
    Filed: May 18, 2017
    Publication date: September 7, 2017
    Inventors: Andrew M. Hawryluk, Ganesh Sundaram, Ritwik Bhatia
  • Publication number: 20170250070
    Abstract: Method and devices are disclosed for device manufacture of gallium nitride devices by growing a gallium nitride layer on a silicon substrate using Atomic Layer Deposition (ALD) followed by rapid thermal annealing. Gallium nitride is grown directly on silicon or on a barrier layer of aluminum nitride grown on the silicon substrate. One or both layers are thermally processed by rapid thermal annealing. Preferably the ALD process use a reaction temperature below 550° C. and preferable below 350° C. The rapid thermal annealing step raises the temperature of the coating surface to a temperature ranging from 550 to 1500° C. for less than 12 msec.
    Type: Application
    Filed: May 17, 2017
    Publication date: August 31, 2017
    Inventors: Andrew M. Hawryluk, Ganesh Sundaram, Ritwik Bhatia
  • Publication number: 20170241019
    Abstract: Methods of performing PE-ALD on a substrate with reduced quartz-based contamination are disclosed. The methods include inductively forming in a quartz plasma tube a hydrogen-based plasma from a feed gas that consists essentially of either hydrogen and nitrogen or hydrogen, argon and nitrogen. The nitrogen constitutes 2 vol % or less of the feed gas. The hydrogen-based plasma includes one or more reactive species. The one or more reactive species in the hydrogen-based plasma are directed to the substrate to cause the one or more reactive species to react with a initial film on the substrate. The trace amounts of nitrogen serve to reduce the amount of quartz-based contamination in the initial film as compared to using no nitrogen in the feed gas.
    Type: Application
    Filed: January 27, 2017
    Publication date: August 24, 2017
    Applicant: Ultratech, Inc.
    Inventors: Mark J. Sowa, Adam Bertuch, Ritwik Bhatia
  • Patent number: 9691613
    Abstract: Method and devices are disclosed for device manufacture of gallium nitride devices by growing a gallium nitride layer on a silicon substrate using Atomic Layer Deposition (ALD) followed by rapid thermal annealing. Gallium nitride is grown directly on silicon or on a barrier layer of aluminum nitride grown on the silicon substrate. One or both layers are thermally processed by rapid thermal annealing. Preferably the ALD process use a reaction temperature below 550° C. and preferable below 350° C. The rapid thermal annealing step raises the temperature of the coating surface to a temperature ranging from 550 to 1500° C. for less than 12 msec.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: June 27, 2017
    Assignee: Ultratech, Inc.
    Inventors: Andrew M. Hawryluk, Ganesh Sundaram, Ritwik Bhatia
  • Patent number: 9633850
    Abstract: Masking methods for atomic-layer-deposition processes for electrode-based devices are disclosed, wherein solder is used as a masking material. The methods include exposing electrical contact members of an electrical device having an active device region and a barrier layer formed by atomic layer deposition. This includes depositing solder elements on the electrical contact members, then forming the barrier layer using atomic layer deposition, wherein the barrier layer covers the active device region and also covers the solder elements that respectively cover the electrical contact members. The solder elements are then melted, which removes respective portions of the barrier layer covering the solder elements. Similar methods are employed for exposing contacts when forming layered capacitors.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: April 25, 2017
    Assignee: Ultratech, Inc.
    Inventor: Ritwik Bhatia
  • Publication number: 20170025272
    Abstract: Masking methods for atomic-layer-deposition processes for electrode-based devices are disclosed, wherein solder is used as a masking material. The methods include exposing electrical contact members of an electrical device having an active device region and a barrier layer formed by atomic layer deposition. This includes depositing solder elements on the electrical contact members, then forming the barrier layer using atomic layer deposition, wherein the barrier layer covers the active device region and also covers the solder elements that respectively cover the electrical contact members. The solder elements are then melted, which removes respective portions of the barrier layer covering the solder elements. Similar methods are employed for exposing contacts when forming layered capacitors.
    Type: Application
    Filed: July 14, 2016
    Publication date: January 26, 2017
    Applicant: Ultratech, Inc.
    Inventor: Ritwik Bhatia
  • Publication number: 20160155629
    Abstract: Method and devices are disclosed for device manufacture of gallium nitride devices by growing a gallium nitride layer on a silicon substrate using Atomic Layer Deposition (ALD) followed by rapid thermal annealing. Gallium nitride is grown directly on silicon or on a barrier layer of aluminum nitride grown on the silicon substrate. One or both layers are thermally processed by rapid thermal annealing. Preferably the ALD process use a reaction temperature below 550° C. and preferable below 350° C. The rapid thermal annealing step raises the temperature of the coating surface to a temperature ranging from 550 to 1500° C. for less than 12 msec.
    Type: Application
    Filed: June 25, 2014
    Publication date: June 2, 2016
    Applicant: Ultratech, Inc.
    Inventors: Andrew M. Hawryluk, Ganesh Sundaram, Ritwik Bhatia
  • Patent number: 7951730
    Abstract: Methods for forming silicon nitride hard masks are provided. The silicon nitride hard masks include carbon-doped silicon nitride layers and undoped silicon nitride layers. Carbon-doped silicon nitride layers that are deposited from a mixture comprising a carbon source compound, a silicon source compound, and a nitrogen source in the presence of RF power are provided. Also provided are methods of UV post-treating silicon nitride layers to provide silicon nitride hard masks. The carbon-doped silicon nitride layers and UV post-treated silicon nitride layers have desirable wet etch rates and dry etch rates for hard mask layers.
    Type: Grant
    Filed: February 4, 2009
    Date of Patent: May 31, 2011
    Assignee: Applied Materials, Inc.
    Inventors: Ritwik Bhatia, Li-Qun Xia, Chad Peterson, Hichem M'Saad
  • Patent number: 7737052
    Abstract: A dielectric cap, interconnect structure containing the same and related methods are disclosed. The inventive dielectric cap includes a multilayered dielectric material stack wherein at least one layer of the stack has good oxidation resistance, Cu diffusion and/or substantially higher mechanical stability during a post-deposition curing treatment, and including Si—N bonds at the interface of a conductive material such as, for example, Cu. The dielectric cap exhibits a high compressive stress and high modulus and is still remain compressive stress under post-deposition curing treatments for, for example: copper low k back-end-of-line (BEOL) nanoelectronic devices, leading to less film and device cracking and improved reliability.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: June 15, 2010
    Assignees: International Business Machines Corporation, Advanced Micro Devices, Inc., Applied Materials, Inc.
    Inventors: Ritwik Bhatia, Griselda Bonilla, Alfred Grill, Joshua L. Herman, Son Van Nguyen, E. Todd Ryan, Hosadurga Shobha
  • Publication number: 20090224374
    Abstract: A dielectric cap, interconnect structure containing the same and related methods are disclosed. The inventive dielectric cap includes a multilayered dielectric material stack wherein at least one layer of the stack has good oxidation resistance, Cu diffusion and/or substantially higher mechanical stability during a post-deposition curing treatment, and including Si—N bonds at the interface of a conductive material such as, for example, Cu. The dielectric cap exhibits a high compressive stress and high modulus and is still remain compressive stress under post-deposition curing treatments for, for example: copper low k back-end-of-line (BEOL) nanoelectronic devices, leading to less film and device cracking and improved reliability.
    Type: Application
    Filed: March 5, 2008
    Publication date: September 10, 2009
    Applicants: INTERNATIONAL BUSINESS MACHINES CORPORATION, ADVANCED MICRO DEVICES, INC., APPLIED MATERIALS, INC.
    Inventors: Ritwik Bhatia, Griselda Bonilla, Alfred Grill, Joshua L. Herman, Son Van Nguyen, E. Todd Ryan, Hosadurga Shobha
  • Publication number: 20090137132
    Abstract: Methods for forming silicon nitride hard masks are provided. The silicon nitride hard masks include carbon-doped silicon nitride layers and undoped silicon nitride layers. Carbon-doped silicon nitride layers that are deposited from a mixture comprising a carbon source compound, a silicon source compound, and a nitrogen source in the presence of RF power are provided. Also provided are methods of UV post-treating silicon nitride layers to provide silicon nitride hard masks. The carbon-doped silicon nitride layers and UV post-treated silicon nitride layers have desirable wet etch rates and dry etch rates for hard mask layers.
    Type: Application
    Filed: February 4, 2009
    Publication date: May 28, 2009
    Inventors: Ritwik Bhatia, Li-Qun Xia, Chad Peterson, Hichem M'Saad
  • Patent number: 7501355
    Abstract: Methods for forming silicon nitride hard masks are provided. The silicon nitride hard masks include carbon-doped silicon nitride layers and undoped silicon nitride layers. Carbon-doped silicon nitride layers that are deposited from a mixture comprising a carbon source compound, a silicon source compound, and a nitrogen source in the presence of RF power are provided. Also provided are methods of UV post-treating silicon nitride layers to provide silicon nitride hard masks. The carbon-doped silicon nitride layers and UV post-treated silicon nitride layers have desirable wet etch rates and dry etch rates for hard mask layers.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: March 10, 2009
    Assignee: Applied Materials, Inc.
    Inventors: Ritwik Bhatia, Li-Qun Xia, Chad Peterson, Hichem M'Saad
  • Publication number: 20080014761
    Abstract: Methods for forming silicon nitride hard masks are provided. The silicon nitride hard masks include carbon-doped silicon nitride layers and undoped silicon nitride layers. Carbon-doped silicon nitride layers that are deposited from a mixture comprising a carbon source compound, a silicon source compound, and a nitrogen source in the presence of RF power are provided. Also provided are methods of UV post-treating silicon nitride layers to provide silicon nitride hard masks. The carbon-doped silicon nitride layers and UV post-treated silicon nitride layers have desirable wet etch rates and dry etch rates for hard mask layers.
    Type: Application
    Filed: June 29, 2006
    Publication date: January 17, 2008
    Inventors: Ritwik Bhatia, Li-Qun Xia, Chad Peterson, Hichem M'Saad
  • Patent number: 7132353
    Abstract: A method of forming a sidewall spacer on a gate electrode is described. The method includes generating a first plasma from a silicon containing precursor and oxide precursor, and forming a silicon oxy-nitride layer on the sidewall of the gate electrode. The method also includes generating a second plasma from the silicon containing precursor and a nitrogen precursor, and forming a nitride layer on the silicon oxy-nitride layer. The silicon containing precursor can flow continuously between the generation of the first and the second plasmas. Also, a method of forming a sidewall spacer on the side of a gate electrode on a substrate. The method includes forming an oxy-nitride layer on the sidewall, and forming a nitride layer on the oxy-nitride layer, where the substrate wafer is not exposed to air between the formation of the layers.
    Type: Grant
    Filed: August 2, 2005
    Date of Patent: November 7, 2006
    Assignee: Applied Materials, Inc.
    Inventors: Li-Qun Xia, Mei-Yee Shek, Troy Kim, Vladamir Zubkov, Ritwik Bhatia