Patents by Inventor Dureseti Chidambarrao

Dureseti Chidambarrao 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: 8217423
    Abstract: While embedded silicon germanium alloy and silicon carbon alloy provide many useful applications, especially for enhancing the mobility of MOSFETs through stress engineering, formation of alloyed silicide on these surfaces degrades device performance. The present invention provides structures and methods for providing unalloyed silicide on such silicon alloy surfaces placed on semiconductor substrates. This enables the formation of low resistance contacts for both mobility enhanced PFETs with embedded SiGe and mobility enhanced NFETs with embedded Si:C on the same semiconductor substrate. Furthermore, this invention provides methods for thick epitaxial silicon alloy, especially thick epitaxial Si:C alloy, above the level of the gate dielectric to increase the stress on the channel on the transistor devices.
    Type: Grant
    Filed: January 4, 2007
    Date of Patent: July 10, 2012
    Assignee: International Business Machines Corporation
    Inventors: Yaocheng Liu, Dureseti Chidambarrao, Oleg Gluschenkov, Judson R Holt, Renee T Mo, Kern Rim
  • Publication number: 20120171831
    Abstract: A method of forming a semiconductor structure is provided. The method includes providing a structure including at least one dummy gate region located on a surface of a semiconductor substrate and a dielectric material layer located on sidewalls of the at least one dummy gate region. Next, a portion of the dummy gate region is removed exposing an underlying high k gate dielectric. A sloped threshold voltage adjusting material layer is then formed on an upper surface of the high k gate dielectric, and thereafter a gate conductor is formed atop the sloped threshold voltage adjusting material layer.
    Type: Application
    Filed: March 15, 2012
    Publication date: July 5, 2012
    Applicant: International Business Machines Corporation
    Inventors: Dureseti Chidambarrao, Sunfei Fang, Yue Liang, Xiaojun Yu, Jun Yuan
  • Publication number: 20120164758
    Abstract: An IC including first metal layer having wiring running in a first direction; a second metal layer having wiring running in a second direction perpendicular to the first direction; and a first via layer between the first metal layer and the second metal layer, the first via layer including a viabar interconnecting the first metal layer to the second metal layer at a first location where the first metal layer vertically coincides with the second metal layer and, at a second location, connecting to wiring of the first metal layer but not wiring of the second metal layer.
    Type: Application
    Filed: March 2, 2012
    Publication date: June 28, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Dureseti Chidambarrao, Stephen E. Greco, Kia S. Low
  • Publication number: 20120149159
    Abstract: While embedded silicon germanium alloy and silicon carbon alloy provide many useful applications, especially for enhancing the mobility of MOSFETs through stress engineering, formation of alloyed silicide on these surfaces degrades device performance. The present invention provides structures and methods for providing unalloyed silicide on such silicon alloy surfaces placed on semiconductor substrates. This enables the formation of low resistance contacts for both mobility enhanced PFETs with embedded SiGe and mobility enhanced NFETs with embedded Si:C on the same semiconductor substrate. Furthermore, this invention provides methods for thick epitaxial silicon alloy, especially thick epitaxial Si:C alloy, above the level of the gate dielectric to increase the stress on the channel on the transistor devices.
    Type: Application
    Filed: February 16, 2012
    Publication date: June 14, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Yaocheng Liu, Dureseti Chidambarrao, Oleg Gluschenkov, Judson R. Holt, Renee T. Mo, Kern Rim
  • Publication number: 20120146092
    Abstract: While embedded silicon germanium alloy and silicon carbon alloy provide many useful applications, especially for enhancing the mobility of MOSFETs through stress engineering, formation of alloyed silicide on these surfaces degrades device performance. The present invention provides structures and methods for providing unalloyed silicide on such silicon alloy surfaces placed on semiconductor substrates. This enables the formation of low resistance contacts for both mobility enhanced PFETs with embedded SiGe and mobility enhanced NFETs with embedded Si:C on the same semiconductor substrate. Furthermore, this invention provides methods for thick epitaxial silicon alloy, especially thick epitaxial Si:C alloy, above the level of the gate dielectric to increase the stress on the channel on the transistor devices.
    Type: Application
    Filed: February 16, 2012
    Publication date: June 14, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Yaocheng Liu, Dureseti Chidambarrao, Oleg Gluschenkov, Judson R. Holt, Renee T. Mo, Kern Rim
  • Publication number: 20120144356
    Abstract: A method for implementing systematic, variation-aware integrated circuit extraction includes inputting a set of processing conditions to a plurality of variation models, each model corresponding to a separate systematic, parametric variation associated with semiconductor manufacturing of an integrated circuit layout; generating, for each variation model, a netlist update attributable to the associated variation, wherein the netlist update is an update with respect to an original netlist extracted from the integrated circuit layout; and storing the netlist updates generated for each of the processing conditions.
    Type: Application
    Filed: February 13, 2012
    Publication date: June 7, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Shayak Banerjee, Dureseti Chidambarrao, James A. Culp, Praveen Elakkumanan, Saibal Mukhopadhyay
  • Publication number: 20120139081
    Abstract: A stack pad layers including a first pad oxide layer, a pad nitride layer, and a second pad oxide layer are formed on a semiconductor-on-insulator (SOI) substrate. A deep trench extending below a top surface or a bottom surface of a buried insulator layer of the SOI substrate and enclosing at least one top semiconductor region is formed by lithographic methods and etching. A stress-generating insulator material is deposited in the deep trench and recessed below a top surface of the SOI substrate to form a stress-generating buried insulator plug in the deep trench. A silicon oxide material is deposited in the deep trench, planarized, and recessed. The stack of pad layer is removed to expose substantially coplanar top surfaces of the top semiconductor layer and of silicon oxide plugs. The stress-generating buried insulator plug encloses, and generates a stress to, the at least one top semiconductor region.
    Type: Application
    Filed: February 10, 2012
    Publication date: June 7, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Huilong Zhu, Brian J. Greene, Dureseti Chidambarrao, Gregory G. Freeman
  • Patent number: 8176444
    Abstract: A method for implementing systematic, variation-aware integrated circuit extraction includes inputting a set of processing conditions to a plurality of variation models, each model corresponding to a separate systematic, parametric variation associated with semiconductor manufacturing of an integrated circuit layout; generating, for each variation model, a netlist update attributable to the associated variation, wherein the netlist update is an update with respect to an original netlist extracted from the integrated circuit layout; and storing the netlist updates generated for each of the processing conditions.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: May 8, 2012
    Assignee: International Business Machines Corporation
    Inventors: Shayak Banerjee, Dureseti Chidambarrao, James A. Culp, Praveen Elakkumanan, Saibal Mukhopadhyay
  • Patent number: 8168971
    Abstract: The invention relates to a semiconductor structure and method of manufacturing and more particularly to a CMOS device with at least one embedded SiGe layer in the source/drain region of the PFET, and at least one embedded SiGe layer in the channel region of the NFET. In one embodiment, the structure of the invention enhances the electron mobility in the NFET device, and further enhances the hole mobility in the PFET device. Additionally, by using the fabrication methods and hence achieving the final structure of the invention, it is also possible to construct a PFET and NFET each with embedded SiGe layers on the same substrate.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: May 1, 2012
    Assignee: International Business Machines Corporation
    Inventors: Dureseti Chidambarrao, Anda C. Mocuta, Dan M. Mocuta, Carl Radens
  • Patent number: 8168489
    Abstract: A semiconductor device and method of manufacturing a semiconductor device. The semiconductor device includes channels for a pFET and an nFET. A SiGe layer is selectively grown in the source and drain regions of the pFET channel and a Si:C layer is selectively grown in source and drain regions of the nFET channel. The SiGe and Si:C layer match a lattice network of the underlying Si layer to create a stress component. In one implementation, this causes a compressive component in the pFET channel and a tensile component in the nFET channel.
    Type: Grant
    Filed: July 24, 2007
    Date of Patent: May 1, 2012
    Assignee: International Business Machines Corporation
    Inventors: Huajie Chen, Dureseti Chidambarrao, Omer H. Dokumaci
  • Publication number: 20120054711
    Abstract: A method (and computer program) identify shapes and locations of transistor elements within a geometric circuit layout. The transistor elements include an active area, at least one gate conductor and other transistor elements. Also, the gate conductor has sides running in a first direction, and has a width dimension running in a second direction perpendicular to the first direction. The method defines regions within the geometric circuit layout. To do so, the method defines a first region having a perimeter positioned along the sides of the gate conductor where the gate conductor intersects the active area and then expands the perimeter of the first region in the second direction to edges of the active area to define a perimeter of a second region. The first region and the second share perimeters in the first direction. The method then expands the perimeter of the second region in the first direction to define a perimeter of a third region.
    Type: Application
    Filed: September 1, 2010
    Publication date: March 1, 2012
    Applicant: International Business Machines Corporation
    Inventors: Dureseti Chidambarrao, Richard Q. Williams
  • Patent number: 8119472
    Abstract: A semiconductor structure and method of manufacturing is provided. The method of manufacturing includes forming shallow trench isolation (STI) in a substrate and providing a first material and a second material on the substrate. The first material and the second material are mixed into the substrate by a thermal anneal process to form a first island and second island at an nFET region and a pFET region, respectively. A layer of different material is formed on the first island and the second island. The STI relaxes and facilitates the relaxation of the first island and the second island. The first material may be deposited or grown Ge material and the second material may deposited or grown Si:C or C. A strained Si layer is formed on at least one of the first island and the second island.
    Type: Grant
    Filed: June 4, 2007
    Date of Patent: February 21, 2012
    Assignee: International Business Machines Corporation
    Inventors: Dureseti Chidambarrao, Omer H. Dokumaci, Oleg G. Gluschenkov
  • Patent number: 8115254
    Abstract: A stack pad layers including a first pad oxide layer, a pad nitride layer, and a second pad oxide layer are formed on a semiconductor-on-insulator (SOI) substrate. A deep trench extending below a top surface or a bottom surface of a buried insulator layer of the SOI substrate and enclosing at least one top semiconductor region is formed by lithographic methods and etching. A stress-generating insulator material is deposited in the deep trench and recessed below a top surface of the SOI substrate to form a stress-generating buried insulator plug in the deep trench. A silicon oxide material is deposited in the deep trench, planarized, and recessed. The stack of pad layer is removed to expose substantially coplanar top surfaces of the top semiconductor layer and of silicon oxide plugs. The stress-generating buried insulator plug encloses, and generates a stress to, the at least one top semiconductor region.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: February 14, 2012
    Assignee: International Business Machines Corporation
    Inventors: Huilong Zhu, Brian J. Greene, Dureseti Chidambarrao, Gregory G. Freeman
  • Publication number: 20110307846
    Abstract: Impact on parametric performance of physical design choices for transistors is scored for on-current and off-current of the transistors. The impact of the design parameters are incorporated into parameters that measure predicted shift in mean on-current and mean off-current and parameters that measure predicted increase in deviations in the distribution of on-current and the off-current. Statistics may be taken at a cell level, a block level, or a chip level to optimize a chip design in a design phase, or to predict changes in parametric yield during manufacturing or after a depressed parametric yield is observed. Further, parametric yield and current level may be predicted region by region and compared with observed thermal emission to pinpoint any anomaly region in a chip to facilitate detection and correction in any mistakes in chip design.
    Type: Application
    Filed: August 24, 2011
    Publication date: December 15, 2011
    Applicant: International Business Machines Corporation
    Inventors: James A. Culp, Paul Chang, Dureseti Chidambarrao, Praveen Elakkumanan, Jason Hibbeler, Anda C. Mocuta
  • Publication number: 20110275198
    Abstract: A semiconductor structure includes an n-channel field effect transistor (NFET) nanowire, the NFET nanowire comprising a film wrapping around a core of the NFET nanowire, the film wrapping configured to provide tensile stress in the NFET nanowire. A method of making a semiconductor structure includes growing a film wrapping around a core of an n-channel field effect transistor (NFET) nanowire of the semiconductor structure, the film wrapping being configured to provide tensile stress in the NFET nanowire.
    Type: Application
    Filed: July 15, 2011
    Publication date: November 10, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Dureseti Chidambarrao, Lidija Sekaric
  • Publication number: 20110272779
    Abstract: An eFuse, includes: a substrate and an insulating layer disposed on the substrate; a first layer including a single crystal or polycrystalline silicon disposed on the insulating layer; a second layer including a single crystal or polycrystalline silicon germanium disposed on the first layer, and a third layer including a silicide disposed on the second layer. The Ge has a final concentration in a range of approximately five percent to approximately twenty-five percent.
    Type: Application
    Filed: July 22, 2011
    Publication date: November 10, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Deok-Kee Kim, Dureseti Chidambarrao, William K. Henson, Chandrasekharan Kothandaraman
  • Patent number: 8053844
    Abstract: Embodiments herein present device, method, etc. for a hybrid orientation scheme for standard orthogonal circuits. An integrated circuit of embodiments of the invention comprises a hybrid orientation substrate, comprising first areas having a first crystalline orientation and second areas having a second crystalline orientation. The first crystalline orientation of the first areas is not parallel or perpendicular to the second crystalline orientation of the second areas. The integrated circuit further comprises first type devices on the first areas and second type devices on the second areas, wherein the first type devices are parallel or perpendicular to the second type devices. Specifically, the first type devices comprise p-type field effect transistors (PFETs) and the second type devices comprise n-type field effect transistors (NFETs).
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventor: Dureseti Chidambarrao
  • Patent number: 8042070
    Abstract: Impact on parametric performance of physical design choices for transistors is scored for on-current and off-current of the transistors. The impact of the design parameters are incorporated into parameters that measure predicted shift in mean on-current and mean off-current and parameters that measure predicted increase in deviations in the distribution of on-current and the off-current. Statistics may be taken at a cell level, a block level, or a chip level to optimize a chip design in a design phase, or to predict changes in parametric yield during manufacturing or after a depressed parametric yield is observed. Further, parametric yield and current level may be predicted region by region and compared with observed thermal emission to pinpoint any anomaly region in a chip to facilitate detection and correction in any mistakes in chip design.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: October 18, 2011
    Assignee: International Business Machines Corporation
    Inventors: James A. Culp, Paul Chang, Dureseti Chidambarrao, Praveen Elakkumanan, Jason Hibbeler, Anda C. Mocuta
  • Patent number: 8037433
    Abstract: A layout of a semiconductor circuit is analyzed to calculate layout-dependant parameters that can include a mobility shift and a threshold voltage shift. Layout-dependant effects that affect the layout dependant parameters may include stress effects, rapid thermal anneal (RTA) effects, and lithographic effects. Intrinsic functions that do not reflect the layout-dependant effects are calculated, followed by calculation of scaling modifiers based on the layout-dependant parameters. A model output function that reflects the layout-dependant effects is obtained by multiplication of each of the intrinsic functions with a corresponding scaling parameter.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: October 11, 2011
    Assignee: International Business Machines Corporation
    Inventors: Dureseti Chidambarrao, Tong Li, Richard Q. Williams, David W. Winston
  • Publication number: 20110225562
    Abstract: A method and computer program product for modeling a semiconductor transistor device structure having an active device area, a gate structure, and including a conductive line feature connected to the gate structure and disposed above the active device area, the conductive line feature including a conductive landing pad feature disposed near an edge of the active device area in a circuit to be modeled. The method includes determining a distance between an edge defined by the landing pad feature to an edge of the active device area, and, from modeling a lithographic rounding effect of the landing pad feature, determining changes in width of the active device area as a function of the distance between an edge defined by the landing pad feature to an edge of the active device area. From these data, an effective change in active device area width (deltaW adder) is related to the determined distance.
    Type: Application
    Filed: May 4, 2011
    Publication date: September 15, 2011
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Dureseti Chidambarrao, Gerald M. Davidson, Paul A. Hyde, Judith H. McCullen, Shreesh Narasimha