Patents by Inventor Raghavasimhan Sreenivasan

Raghavasimhan Sreenivasan 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: 9059253
    Abstract: Embodiments of the invention include methods of forming gate caps. Embodiments may include providing a semiconductor device including a gate on a semiconductor substrate and a source/drain region on the semiconductor substrate adjacent to the gate, forming a blocking region, a top surface of which extends above a top surface of the gate, depositing an insulating layer above the semiconductor device, and planarizing the insulating layer using the blocking region as a planarization stop. Embodiments further include semiconductor devices having a semiconductor substrate, a gate above the semiconductor substrate, a source/drain region adjacent to the gate, a gate cap above the gate that cover the full width of the gate, and a contact adjacent to the source/drain region having a portion of its sidewall defined by the gate cap.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: June 16, 2015
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan, Thomas N. Adam
  • Publication number: 20150155306
    Abstract: FinFET devices and methods of making the same. A structure includes: a substrate with a buried insulator, a plurality of fins over the buried insulator, and a nitride material filing spaces between the plurality of fins, wherein the plurality of fins remain uncovered by the nitride.
    Type: Application
    Filed: December 2, 2013
    Publication date: June 4, 2015
    Applicant: International Business Machines Corpporation
    Inventors: Thomas N. Adam, Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan
  • Publication number: 20150155307
    Abstract: FinFET devices and methods of making the same. A structure includes: a substrate with a buried insulator, a plurality of fins over a recessed buried insulator, and a nitride material filing recessed spaces between the plurality of fins, wherein the plurality of fins remain uncovered by the nitride, and wherein the nitride material does not contact the bottom of the plurality of fins.
    Type: Application
    Filed: December 2, 2013
    Publication date: June 4, 2015
    Applicant: International Business Machines Corporation
    Inventors: Thomas N. Adam, Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan
  • Publication number: 20150147868
    Abstract: A semiconductor device includes a bulk substrate having a plurality of trenches formed therein. The trenches define a plurality of semiconductor fins that are integral with the bulk semiconductor substrate. A local dielectric material is disposed in each trench and between each pair of semiconductor fins among the plurality of semiconductor fins. The semiconductor device further includes an etch resistant layer formed on the local dielectric material.
    Type: Application
    Filed: January 28, 2015
    Publication date: May 28, 2015
    Inventors: Kangguo Cheng, Raghavasimhan Sreenivasan
  • Patent number: 9041116
    Abstract: A method for forming an electrical device that includes forming a high-k gate dielectric layer over a semiconductor substrate that is patterned to separate a first portion of the high-k gate dielectric layer that is present on a first conductivity device region from a second portion of the high-k gate dielectric layer that is present on a second conductivity device region. A connecting gate conductor is formed on the first portion and the second portion of the high-k gate dielectric layer. The connecting gate conductor extends from the first conductivity device region over the isolation region to the second conductivity device region. One of the first conductivity device region and the second conductivity device region may then be exposed to an oxygen containing atmosphere. Exposure with the oxygen containing atmosphere modifies a threshold voltage of the semiconductor device that is exposed.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: May 26, 2015
    Assignee: International Business Machines Corporation
    Inventors: Bruce B. Doris, Kangguo Cheng, Steven J. Holmes, Ali Khakifirooz, Pranita Kulkarni, Shom Ponoth, Raghavasimhan Sreenivasan, Stefan Schmitz
  • Patent number: 9034703
    Abstract: A method of forming a semiconductor device including providing a functional gate structure on a channel portion of a semiconductor substrate. A gate sidewall spacer is adjacent to the functional gate structure and an interlevel dielectric layer is present adjacent to the gate sidewall spacer. The upper surface of the gate conductor is recessed relative to the interlevel dielectric layer. A multi-layered cap is formed a recessed surface of the gate structure, wherein at least one layer of the multi-layered cap includes a high-k dielectric material and is present on a sidewall of the gate sidewall spacer at an upper surface of the functional gate structure. Via openings are etched through the interlevel dielectric layer selectively to at least the high-k dielectric material of the multi-layered cap, wherein at least the high-k dielectric material protects a sidewall of the gate conductor.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: May 19, 2015
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kangguo Cheng, Ali Khakifirooz, Shom Ponoth, Raghavasimhan Sreenivasan
  • Publication number: 20150076608
    Abstract: A semiconductor device includes a first device region and second device region of opposite polarity. Each device region includes at least a transistor device and associated epitaxy. A high-k barrier is formed to overlay the first device region epitaxy only. The high-k barrier may include a substantially horizontal portion formed upon a top surface of the first device region epitaxy and a substantially vertical portion formed upon an outer surface of the first device region epitaxy.
    Type: Application
    Filed: September 18, 2013
    Publication date: March 19, 2015
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Kangguo Cheng, Ali Khakifirooz, Shom Ponoth, Raghavasimhan Sreenivasan
  • Patent number: 8975675
    Abstract: A semiconductor device includes a bulk substrate having a plurality of trenches formed therein. The trenches define a plurality of semiconductor fins that are integral with the bulk semiconductor substrate. A local dielectric material is disposed in each trench and between each pair of semiconductor fins among the plurality of semiconductor fins. The semiconductor device further includes an etch resistant layer formed on the local dielectric material.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: March 10, 2015
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Raghavasimhan Sreenivasan
  • Publication number: 20150064817
    Abstract: Embodiments of the present invention provide an electrically controlled optical fuse. The optical fuse is activated electronically instead of by the light source itself. An applied voltage causes the fuse temperature to rise, which induces a transformation of a phase changing material from transparent to opaque. A gettering layer absorbs excess atoms released during the transformation.
    Type: Application
    Filed: October 31, 2014
    Publication date: March 5, 2015
    Applicant: International Business Machines Corporation
    Inventors: Kangguo Cheng, Raghavasimhan Sreenivasan
  • Publication number: 20150048455
    Abstract: Embodiments of present invention provide a method of forming a semiconductor device. The method includes depositing a layer of metal over one or more channel regions of respective one or more transistors in a substrate, the layer of metal having a first region and a second region; lowering height of the first region of the layer of metal; forming an insulating layer over the first region of lowered height, the insulating layer being formed to have a top surface coplanar with the second region of the layer of metal; and forming at least one contact to a source/drain region of the one or more transistors. Structure of the semiconductor device formed thereby is also provided.
    Type: Application
    Filed: August 19, 2013
    Publication date: February 19, 2015
    Applicant: International Business Machines Corporation
    Inventors: Veeraraghavan S. Basker, Kangguo Cheng, Ali Khakifirooz, Viraj Y. Sardesai, Raghavasimhan Sreenivasan
  • Publication number: 20150041868
    Abstract: A semiconductor device is provided that includes a gate structure that is present on a channel portion of a semiconductor substrate that is present between a source region and a drain region. The gate structure includes at least a gate conductor and a gate sidewall spacer that is adjacent to the at least one gate conductor. An upper surface of the gate conductor is recessed relative to an upper surface of the gate sidewall spacer. A multi-layered cap is present on the upper surface of the gate conductor. The multi-layered cap includes a high-k dielectric material and a dielectric cap spacer that is present on a portion of the high-k dielectric material that is present on the sidewall of the gate sidewall spacer.
    Type: Application
    Filed: October 23, 2014
    Publication date: February 12, 2015
    Inventors: Kangguo Cheng, Ali Khakifirooz, Shom Ponoth, Raghavasimhan Sreenivasan
  • Patent number: 8923666
    Abstract: Embodiments of the present invention provide an electrically controlled optical fuse. The optical fuse is activated electronically instead of by the light source itself. An applied voltage causes the fuse temperature to rise, which induces a transformation of a phase changing material from transparent to opaque. A gettering layer absorbs excess atoms released during the transformation.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: December 30, 2014
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Raghavasimhan Sreenivasan
  • Publication number: 20140346573
    Abstract: A method of forming a semiconductor device is disclosed. The method includes forming a first dielectric layer on a substrate; forming a set of bias lines on the first dielectric layer; covering the set of bias lines with a second dielectric layer; forming a semiconductor layer on the second dielectric layer; and forming a set of devices on the semiconductor layer above the set of bias lines.
    Type: Application
    Filed: May 23, 2013
    Publication date: November 27, 2014
    Applicant: International Business Machines Corporation
    Inventors: Thomas N. Adam, Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan
  • Patent number: 8896032
    Abstract: Non-planar semiconductor FET based sensors are provided that have an enhanced sensing area to volume ratio which results in faster response times than existing planar FET based sensors. The FET based sensors of the present disclosure include a V-shaped gate dielectric portion located in a V-shaped opening formed in a semiconductor substrate. In some embodiments, the FET based sensors of the present disclosure also include a self-aligned source region and a self-aligned drain region located in the semiconductor substrate and on opposing sides of the V-shaped opening. In other embodiments, the FET based sensors include a self-aligned source region and a self-aligned drain region located in the semiconductor substrate and on opposing sides of a gate dielectric material portion that is present on an uppermost surface of the semiconductor substrate.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: November 25, 2014
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Bruce B. Doris, Ali Khakifirooz, Raghavasimhan Sreenivasan, Sufi Zafar
  • Patent number: 8884344
    Abstract: Embodiments of the invention include methods of forming gate caps. Embodiments may include providing a semiconductor device including a gate on a semiconductor substrate and a source/drain region on the semiconductor substrate adjacent to the gate, forming a blocking region, a top surface of which extends above a top surface of the gate, depositing an insulating layer above the semiconductor device, and planarizing the insulating layer using the blocking region as a planarization stop. Embodiments further include semiconductor devices having a semiconductor substrate, a gate above the semiconductor substrate, a source/drain region adjacent to the gate, a gate cap above the gate that cover the full width of the gate, and a contact adjacent to the source/drain region having a portion of its sidewall defined by the gate cap.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: November 11, 2014
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan, Thomas N. Adam
  • Publication number: 20140327058
    Abstract: Embodiments of the invention include methods of forming gate caps. Embodiments may include providing a semiconductor device including a gate on a semiconductor substrate and a source/drain region on the semiconductor substrate adjacent to the gate, forming a blocking region, a top surface of which extends above a top surface of the gate, depositing an insulating layer above the semiconductor device, and planarizing the insulating layer using the blocking region as a planarization stop. Embodiments further include semiconductor devices having a semiconductor substrate, a gate above the semiconductor substrate, a source/drain region adjacent to the gate, a gate cap above the gate that cover the full width of the gate, and a contact adjacent to the source/drain region having a portion of its sidewall defined by the gate cap.
    Type: Application
    Filed: July 22, 2014
    Publication date: November 6, 2014
    Inventors: Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan, Thomas N. Adam
  • Patent number: 8872172
    Abstract: Semiconductor structures having embedded source/drains with oxide underlayers and methods for forming the same. Embodiments include semiconductor structures having a channel in a substrate, and a source/drain region adjacent to the channel including an embedded oxide region and an embedded semiconductor region located above the embedded oxide region. Embodiments further include methods of forming a transistor structure including forming a gate on a substrate, etching a source/drain recess in the substrate, filling a bottom portion of the source/drain recess with an oxide layer, and filling a portion of the source/drain recess not filled by the oxide layer with a semiconductor layer.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: October 28, 2014
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan, Thomas N. Adam
  • Publication number: 20140312425
    Abstract: FinFET structures and methods of formation are disclosed. Fins are formed on a bulk substrate. A crystalline insulator layer is formed on the bulk substrate with the fins sticking out of the epitaxial oxide layer. A gate is formed around the fins protruding from the crystalline insulator layer. An epitaxially grown semiconductor region is formed in the source drain region by merging the fins on the crystalline insulator layer to form a fin merging region.
    Type: Application
    Filed: April 22, 2013
    Publication date: October 23, 2014
    Applicant: Interantional Business Machines Corporation
    Inventors: Thomas N. Adam, Kangguo Cheng, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan
  • Patent number: 8865561
    Abstract: A method of forming a semiconductor device is disclosed. The method includes forming a set of doped regions in a substrate; forming a crystalline dielectric layer on the substrate, the crystalline dielectric layer including an epitaxial oxide; forming a semiconductor layer on the crystalline dielectric layer, the semiconductor layer and the crystalline dielectric layer forming an extremely thin semiconductor-on-insulator (ETSOI) structure; and forming a set of devices on the semiconductor layer, wherein at least one device in the set of devices is formed over a doped region.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: October 21, 2014
    Assignee: International Business Machines Corporation
    Inventors: Kangguo Cheng, Thomas N. Adam, Bruce B. Doris, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan
  • Publication number: 20140273418
    Abstract: A method of forming a semiconductor device is disclosed. The method includes forming a set of doped regions in a substrate; forming a crystalline dielectric layer on the substrate, the crystalline dielectric layer including an epitaxial oxide; forming a semiconductor layer on the crystalline dielectric layer, the semiconductor layer and the crystalline dielectric layer forming an extremely thin semiconductor-on-insulator (ETSOI) structure; and forming a set of devices on the semiconductor layer, wherein at least one device in the set of devices is formed over a doped region.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: International Business Machines Corporation
    Inventors: Kangguo Cheng, Thomas N. Adam, Bruce B. Doris, Ali Khakifirooz, Alexander Reznicek, Raghavasimhan Sreenivasan