Patents by Inventor Srikanth Samavedam
Srikanth Samavedam 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).
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Patent number: 9362357Abstract: A method of forming SSRW FETs with controlled step height between a field oxide and epitaxially grown silicon and the resulting devices are provided. Embodiments include providing a SiN layer on a substrate, forming first, second, and third spaced STI regions of field oxide through the SiN layer and into the substrate, removing a top portion of the field oxide for each STI region by a controlled deglaze, removing the SiN layer, forming an n-type region in the substrate between the first and second STI regions and a p-type region in the substrate between the second and third STI regions, and epitaxially growing a Si based layer on the substrate over the n-type and p-type regions.Type: GrantFiled: May 19, 2015Date of Patent: June 7, 2016Assignee: GLOBALFOUNDRIES INC.Inventors: Laegu Kang, Vara Govindeswara Reddy Vakada, Michael Ganz, Yi Qi, Puneet Khanna, Sri Charan Vemula, Srikanth Samavedam
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Patent number: 9196548Abstract: Methodology enabling selectively connecting fin structures using a segmented trench salicide layer, and the resulting device are disclosed. Embodiments include: providing on a substrate at least one gate structure; providing first and second fin structures in a vertical direction intersecting with the at least one gate structure; and providing a first segment of a salicide layer, the first segment being formed along a horizontal direction and being connected with the second fin structure and separated from the first fin structure.Type: GrantFiled: December 28, 2012Date of Patent: November 24, 2015Assignee: GLOBALFOUNDRIES INC.Inventors: Mahbub Rashed, Srikanth Samavedam, David Doman, Navneet Jain, Subramani Kengeri, Suresh Venkatesan
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Publication number: 20150270346Abstract: Disclosed herein are various methods of forming replacement gate structures with a recessed channel region. In one example, the method includes forming a sacrificial gate structure above a semiconducting substrate, removing the sacrificial gate structure to thereby define an initial gate opening having sidewalls and to expose a surface of the substrate and performing an etching process on the exposed surface of the substrate to define a recessed channel in the substrate. The method includes the additional steps of forming a sidewall spacer within the initial gate opening on the sidewalls of the initial gate opening to thereby define a final gate opening and forming a replacement gate structure in the final gate opening.Type: ApplicationFiled: June 5, 2015Publication date: September 24, 2015Inventors: Kuldeep Amarnath, Michael Hargrove, Srikanth Samavedam
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Publication number: 20150249129Abstract: A method of forming SSRW FETs with controlled step height between a field oxide and epitaxially grown silicon and the resulting devices are provided. Embodiments include providing a SiN layer on a substrate, forming first, second, and third spaced STI regions of field oxide through the SiN layer and into the substrate, removing a top portion of the field oxide for each STI region by a controlled deglaze, removing the SiN layer, forming an n-type region in the substrate between the first and second STI regions and a p-type region in the substrate between the second and third STI regions, and epitaxially growing a Si based layer on the substrate over the n-type and p-type regions.Type: ApplicationFiled: May 19, 2015Publication date: September 3, 2015Inventors: Laegu KANG, Vara Govindeswara Reddy VAKADA, Michael GANZ, Yi QI, Puneet KHANNA, Sri Charan VEMULA, Srikanth SAMAVEDAM
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Patent number: 9099525Abstract: A method of forming SSRW FETs with controlled step height between a field oxide and epitaxially grown silicon and the resulting devices are provided. Embodiments include providing a SiN layer on a substrate, forming first, second, and third spaced STI regions of field oxide through the SiN layer and into the substrate, removing a top portion of the field oxide for each STI region by a controlled deglaze, removing the SiN layer, forming an n-type region in the substrate between the first and second STI regions and a p-type region in the substrate between the second and third STI regions, and epitaxially growing a Si based layer on the substrate over the n-type and p-type regions.Type: GrantFiled: December 28, 2012Date of Patent: August 4, 2015Assignee: GLOBALFOUNDRIES Inc.Inventors: Laegu Kang, Vara Govindeswara Reddy Vakada, Michael P. Ganz, Yi Qi, Puneet Khanna, Sri Charan Vemula, Srikanth Samavedam
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Patent number: 9099380Abstract: A methodology enabling the formation of steep channel profiles for devices, such as SSRW FETs, having a resultant channel profiles that enables suppression of threshold voltage variation and the resulting device are disclosed. Embodiments include providing STI regions in a silicon wafer; performing a deep well implantation of a dopant into the silicon wafer between STI regions; forming a recess in the doped silicon wafer between the STI regions; performing a shallow well implantation of the dopant into the silicon wafer in the recess; and forming Si:C on the doped silicon wafer in the recess.Type: GrantFiled: October 10, 2014Date of Patent: August 4, 2015Assignee: GLOBALFOUNDRIES Inc.Inventors: Vara Govindeswara Reddy Vakada, Laegu Kang, Michael P. Ganz, Yi Qi, Puneet Khanna, Sri Charan Vemula, Srikanth Samavedam
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Patent number: 9099492Abstract: Disclosed herein are various methods of forming replacement gate structures with a recessed channel region. In one example, the method includes forming a sacrificial gate structure above a semiconducting substrate, removing the sacrificial gate structure to thereby define an initial gate opening having sidewalls and to expose a surface of the substrate and performing an etching process on the exposed surface of the substrate to define a recessed channel in the substrate. The method includes the additional steps of forming a sidewall spacer within the initial gate opening on the sidewalls of the initial gate opening to thereby define a final gate opening and forming a replacement gate structure in the final gate opening.Type: GrantFiled: March 26, 2012Date of Patent: August 4, 2015Assignee: GLOBALFOUNDRIES Inc.Inventors: Kuldeep Amarnath, Michael Hargrove, Srikanth Samavedam
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Publication number: 20150053981Abstract: A methodology enabling the formation of steep channel profiles for devices, such as SSRW FETs, having a resultant channel profiles that enables suppression of threshold voltage variation and the resulting device are disclosed. Embodiments include providing STI regions in a silicon wafer; performing a deep well implantation of a dopant into the silicon wafer between STI regions; forming a recess in the doped silicon wafer between the STI regions; performing a shallow well implantation of the dopant into the silicon wafer in the recess; and forming Si:C on the doped silicon wafer in the recess.Type: ApplicationFiled: October 10, 2014Publication date: February 26, 2015Inventors: Vara Govindeswara Reddy VAKADA, Laegu KANG, Michael P. GANZ, Yi QI, Puneet KHANNA, Sri Charan VEMULA, Srikanth SAMAVEDAM
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Patent number: 8916442Abstract: A methodology enabling the formation of steep channel profiles for devices, such as SSRW FETs, having a resultant channel profiles that enables suppression of threshold voltage variation and the resulting device are disclosed. Embodiments include providing STI regions in a silicon wafer; performing a deep well implantation of a dopant into the silicon wafer between STI regions; forming a recess in the doped silicon wafer between the STI regions; performing a shallow well implantation of the dopant into the silicon wafer in the recess; and forming Si:C on the doped silicon wafer in the recess.Type: GrantFiled: January 17, 2013Date of Patent: December 23, 2014Assignee: GLOBALFOUNDRIES Inc.Inventors: Vara Govindeswara Reddy Vakada, Laegu Kang, Michael P. Ganz, Yi Qi, Puneet Khanna, Sri Charan Vemula, Srikanth Samavedam
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Patent number: 8809178Abstract: One illustrative method disclosed herein includes forming a plurality of spaced-apart trenches in a semiconducting substrate to thereby define a fin structure for the device, forming a local isolation region within each of the trenches, forming a sacrificial gate structure on the fin structure, wherein the sacrificial gate structure comprises at least a sacrificial gate electrode, and forming a layer of insulating material above the fin structure and within the trench above the local isolation region. In this example, the method further includes performing at least one etching process to remove the sacrificial gate structure to thereby define a gate cavity, after removing the sacrificial gate structure, performing at least one etching process to form a recess in the local isolation region, and forming a replacement gate structure that is positioned in the recess in the local isolation region and in the gate cavity.Type: GrantFiled: February 29, 2012Date of Patent: August 19, 2014Assignee: GLOBALFOUNDRIES Inc.Inventors: Yanxiang Liu, Michael Hargrove, Xiaodong Yang, Hans van Meer, Laegu Kang, Christian Gruensfelder, Srikanth Samavedam
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Publication number: 20140197411Abstract: A methodology enabling the formation of steep channel profiles for devices, such as SSRW FETs, having a resultant channel profiles that enables suppression of threshold voltage variation and the resulting device are disclosed. Embodiments include providing STI regions in a silicon wafer; performing a deep well implantation of a dopant into the silicon wafer between STI regions; forming a recess in the doped silicon wafer between the STI regions; performing a shallow well implantation of the dopant into the silicon wafer in the recess; and forming Si:C on the doped silicon wafer in the recess.Type: ApplicationFiled: January 17, 2013Publication date: July 17, 2014Applicant: GLOBAL FOUNDERIES INC.Inventors: Vara Govindeswara Reddy VAKADA, Laegu Kang, Michael P. Ganz, Yi Qi, Puneet Khanna, Sri Charan Vemula, Srikanth Samavedam
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Publication number: 20140183638Abstract: Methodology enabling selectively connecting fin structures using a segmented trench salicide layer, and the resulting device are disclosed. Embodiments include: providing on a substrate at least one gate structure; providing first and second fin structures in a vertical direction intersecting with the at least one gate structure; and providing a first segment of a salicide layer, the first segment being formed along a horizontal direction and being connected with the second fin structure and separated from the first fin structure.Type: ApplicationFiled: December 28, 2012Publication date: July 3, 2014Applicant: GLOBALFOUNDRIES Inc.Inventors: Mahbub RASHED, Srikanth Samavedam, David Doman, Navneet Jain, Subramani Kengeri, Suresh Venkatesan
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Publication number: 20140183551Abstract: A method of forming SSRW FETs with controlled step height between a field oxide and epitaxially grown silicon and the resulting devices are provided. Embodiments include providing a SiN layer on a substrate, forming first, second, and third spaced STI regions of field oxide through the SiN layer and into the substrate, removing a top portion of the field oxide for each STI region by a controlled deglaze, removing the SiN layer, forming an n-type region in the substrate between the first and second STI regions and a p-type region in the substrate between the second and third STI regions, and epitaxially growing a Si based layer on the substrate over the n-type and p-type regions.Type: ApplicationFiled: December 28, 2012Publication date: July 3, 2014Applicant: GLOBALFOUNDRIES Inc.Inventors: Laegu Kang, Vara Govindeswara Reddy Vakada, Michael P. Ganz, Yi Qi, Puneet Khanna, Sri Charan Vemula, Srikanth Samavedam
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Publication number: 20140070358Abstract: A methodology is disclosed enabling the formation of silicon trench profiles for devices, such as SSRW FETs, having a resultant profile that enables desirable epitaxial growth of semiconductor materials. Embodiments include forming a trench in a silicon wafer between STI regions, thermally treating the silicon surfaces of the trench, and forming Si:C in the trench. The process eliminates a need for an isotropic silicon etch to achieve a desirable flat surface. Further, the flat bottom surface provides a desirable surface for epitaxial growth of semiconductor materials, such as Si:C.Type: ApplicationFiled: September 12, 2012Publication date: March 13, 2014Applicant: GLOBALFOUNDRIES Inc.Inventors: Yi Qi, Puneet Khanna, Srikanth Samavedam, Vara G. Vakada, Michael P. Ganz, Sri Charan Vemula, Laegu Kang, Bharat V. Krishnan
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Publication number: 20130248985Abstract: Disclosed herein are various methods of forming replacement gate structures with a recessed channel region. In one example, the method includes forming a sacrificial gate structure above a semiconducting substrate, removing the sacrificial gate structure to thereby define an initial gate opening having sidewalls and to expose a surface of the substrate and performing an etching process on the exposed surface of the substrate to define a recessed channel in the substrate. The method includes the additional steps of forming a sidewall spacer within the initial gate opening on the sidewalls of the initial gate opening to thereby define a final gate opening and forming a replacement gate structure in the final gate opening.Type: ApplicationFiled: March 26, 2012Publication date: September 26, 2013Applicant: GLOBALFOUNDRIES INC.Inventors: Kuldeep Amarnath, Michael Hargrove, Srikanth Samavedam
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Publication number: 20130224945Abstract: One illustrative method disclosed herein includes forming a plurality of spaced-apart trenches in a semiconducting substrate to thereby define a fin structure for the device, forming a local isolation region within each of the trenches, forming a sacrificial gate structure on the fin structure, wherein the sacrificial gate structure comprises at least a sacrificial gate electrode, and forming a layer of insulating material above the fin structure and within the trench above the local isolation region. In this example, the method further includes performing at least one etching process to remove the sacrificial gate structure to thereby define a gate cavity, after removing the sacrificial gate structure, performing at least one etching process to form a recess in the local isolation region, and forming a replacement gate structure that is positioned in the recess in the local isolation region and in the gate cavity.Type: ApplicationFiled: February 29, 2012Publication date: August 29, 2013Applicant: GLOBALFOUNDRIES Inc.Inventors: Yanxiang Liu, Michael Hargrove, Xiaodong Yang, Hans Van Meer, Laegu Kang, Christian Gruensfelder, Srikanth Samavedam
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Publication number: 20120306021Abstract: A semiconductor device is provided that includes a first pair of P channel field effect transistors (PFET) with a common source connected to a voltage contact and a gate connected to a drain of the other PFET and a pair of N channel field effect transistors (NFET) sized smaller than the first pair of PFETs with a drain connected to the drain of the respective PFET of the first pair of PFETs, a common source connected to a ground contact, and a gate connected to the drain of an opposite PFET of the first pair of PFETs. Additionally, a second pair of PFETs sized larger than the NFETs and approximately one-half that of the first pair of PFETS, each of the second pair of PFETs having a drain respectively coupled to a connection linking the respective drain of the NFET of the pair of NFETs to the drain of the PFET of the first pair of PFETs. Complementary bit lines are included, each of the complementary bit lines respectively connected to a source of the second pair of PFETs.Type: ApplicationFiled: June 3, 2011Publication date: December 6, 2012Applicant: GLOBALFOUNDRIES INC.Inventors: Srikanth SAMAVEDAM, Bipul PAUL, Srinath KRISHNAN, Sriram BALASUBRAMANIAN
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Publication number: 20070077698Abstract: A method of fabricating a MOS transistor that comprises a dual-metal gate that is formed from heterotypical metals. A gate dielectric (34), such as HfO2, is deposited on a semiconductor substrate. A sacrificial layer (35), is next deposited over the gate dielectric. The sacrificial layer is patterned so that the gate dielectric over a first (pMOS, for example) area (32) of the substrate is exposed and gate dielectric over a second (nMOS, for example) area (33) of the substrate continues to be protected by the sacrificial layer. A first gate conductor material (51) is deposited over the remaining sacrificial area and over the exposed gate dielectric. The first gate conductor material is patterned so that first gate conductor material over the second area of the substrate is etched away. The sacrificial layer over the second area prevents damage to the underlying dielectric material as the first gate conductor material is removed.Type: ApplicationFiled: September 8, 2006Publication date: April 5, 2007Applicant: Freescale Semiconductor, Inc.Inventors: David Gilmer, Srikanth Samavedam, Philip Tobin
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Publication number: 20060076046Abstract: In certain embodiments, a thermoelectric device apparatus includes a plurality of laterally spaced-apart electrodes disposed upon a supporting structure, and at least one complementary pair of thermoelectric elements, each thermoelectric element coupling an electrode to a laterally adjacent electrode. Such a structure reduces the need for solder joints or other structures or mechanisms to attach multiple substrates, components, or assemblies together to form a thermoelectric device.Type: ApplicationFiled: May 6, 2005Publication date: April 13, 2006Inventors: Uttam Ghoshal, Tat Ngai, Srikanth Samavedam, Zhengmao Ye, Andrew Miner
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Publication number: 20050282326Abstract: A method of fabricating a MOS transistor that comprises a dual-metal gate that is formed from heterotypical metals. A gate dielectric (34), such as HfO2, is deposited on a semiconductor substrate. A sacrificial layer (35), is next deposited over the gate dielectric. The sacrificial layer is patterned so that the gate dielectric over a first (pMOS, for example) area (32) of the substrate is exposed and gate dielectric over a second (nMOS, for example) area (33) of the substrate continues to be protected by the sacrificial layer. A first gate conductor material (51) is deposited over the remaining sacrificial area and over the exposed gate dielectric. The first gate conductor material is patterned so that first gate conductor material over the second area of the substrate is etched away. The sacrificial layer over the second area prevents damage to the underlying dielectric material as the first gate conductor material is removed.Type: ApplicationFiled: August 25, 2005Publication date: December 22, 2005Inventors: David Gilmer, Srikanth Samavedam, Philip Tobin