Patents by Inventor Mahalingam Nandakumar

Mahalingam Nandakumar 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).

  • Publication number: 20080308904
    Abstract: A method of manufacturing a semiconductor device. The method comprises providing C atoms in a semiconductor substrate. The method also comprises implanting In atoms and p-type dopants into a predefined region of the substrate that is configured to have the carbon atoms. The method further comprises thermally annealing the semiconductor substrate to transform the predefined region into an activated doped region.
    Type: Application
    Filed: June 15, 2007
    Publication date: December 18, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: P. R. Chidambaram, Srinivasan Chakravarthi, Mahalingam Nandakumar, Manoj Mehrotra, Amitabh Jain, Thomas D. Bonifield
  • Patent number: 7402535
    Abstract: The present invention provides the method includes forming source/drain regions 170 in a semiconductor wafer substrate 110 adjacent a gate structure 130 located on a front side of the semiconductor wafer substrate 110. The source/drain regions 170 have a channel region 175 located between them. A first stress-inducing layer 190 is placed on a backside of the semiconductor wafer substrate 110 and is subjected to a thermal anneal to cause a stress to form in the channel region 175.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: July 22, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Mahalingam Nandakumar, Haowen Bu
  • Publication number: 20080160708
    Abstract: A sidewall spacer pullback scheme is implemented in forming a transistor. The scheme, among other things, allows silicide regions of the transistor to be made larger, or rather have a larger surface area. The larger surface area has a lower resistance and thus allows voltages to be applied to the transistor more accurately. The scheme also allows transistors to be made slightly thinner so that the formation of voids in a layer of dielectric material formed over the transistors is mitigated. This mitigates yield loss by facilitating more predictable or otherwise desirable transistor behavior.
    Type: Application
    Filed: March 27, 2007
    Publication date: July 3, 2008
    Inventors: Mahalingam Nandakumar, Amitava Chatterjee, Terrence J. Riley
  • Patent number: 7393787
    Abstract: The present invention provides a method for manufacturing a gate dielectric, a method for manufacturing a semiconductor device, and a method for manufacturing an integrated circuit. The method for manufacturing the gate dielectric, without limitation, may include forming a nitrided dielectric layer (520) over a substrate (310), the nitrided dielectric layer (520) having a non-uniformity of nitrogen in a bulk thereof, and removing at least a portion of the nitrided dielectric layer (520) using a high temperature chemical treatment, the removing reducing the non-uniformity.
    Type: Grant
    Filed: August 22, 2005
    Date of Patent: July 1, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Hiroaki Niimi, Reima T. Laaksonen, Mahalingam Nandakumar
  • Publication number: 20070287274
    Abstract: Formation of an NMOS transistor is disclosed, where at least one of carbon, atomic fluorine and molecular fluorine (F2) are combined with implantations of at least one of arsenic, phosphorous and antimony. The dopant combinations can be used in LDD implantations to form source/drain extension regions, as well as in implantations to form halo regions and/or source/drain regions. The combinations of dopants help to reduce sheet resistance and increase carrier mobility, which in turn facilitates device scaling and desired device performance.
    Type: Application
    Filed: June 13, 2006
    Publication date: December 13, 2007
    Inventors: Mahalingam Nandakumar, Amitabh Jain, Lahir Shaik Adam
  • Publication number: 20070196991
    Abstract: The present invention provides a method for manufacturing a semiconductor device as well as a semiconductor device. The method, among other steps, may include forming a gate structure over a substrate, and forming a strain inducing sidewall spacer proximate a sidewall of the gate structure, the strain inducing sidewall configured to introduce strain in a channel region below the gate structure.
    Type: Application
    Filed: December 14, 2006
    Publication date: August 23, 2007
    Applicant: Texas Instruments Incorporated
    Inventors: Mahalingam Nandakumar, Wayne Bather, Narendra Mehta, Lahir Adam
  • Patent number: 7211481
    Abstract: The present invention facilitates semiconductor fabrication by providing methods of fabrication that apply tensile strain to channel regions of devices while mitigating unwanted dopant diffusion, which degrades device performance. Source/drain regions are formed in active regions of a PMOS region (102). A first thermal process is performed that activates the formed source/drain regions and drives in implanted dopants (104). Subsequently, source/drain regions are formed in active regions of an NMOS region (106). Then, a capped poly layer is formed over the device (108). A second thermal process is performed (110) that causes the capped poly layer to induce strain into the channel regions of devices. Because of the first thermal process, unwanted dopant diffusion, particularly unwanted p-type dopant diffusion, during the second thermal process is mitigated.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: May 1, 2007
    Assignee: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Lahir Shaik Adam, Song Zhao, Mahalingam Nandakumar
  • Publication number: 20070042559
    Abstract: The present invention provides a method for manufacturing a gate dielectric, a method for manufacturing a semiconductor device, and a method for manufacturing an integrated circuit. The method for manufacturing the gate dielectric, without limitation, may include forming a nitrided dielectric layer (520) over a substrate (310), the nitrided dielectric layer (520) having a non-uniformity of nitrogen in a bulk thereof, and removing at least a portion of the nitrided dielectric layer (520) using a high temperature chemical treatment, the removing reducing the non-uniformity.
    Type: Application
    Filed: August 22, 2005
    Publication date: February 22, 2007
    Applicant: Texas Instruments, Incorporated
    Inventors: Hiroaki Niimi, Reima Laaksonen, Mahalingam Nandakumar
  • Publication number: 20060246645
    Abstract: A new MOS transistor is described. The transistor has a source/drain region that comprises 3 portions. Each portion is the result of a separate ion implant step. The combination of the three portions of the source/drain region yields a transistor of superior performance with high drive current, low sub-threshold current and gate-edge leakage.
    Type: Application
    Filed: July 14, 2006
    Publication date: November 2, 2006
    Inventors: Mahalingam Nandakumar, Seetharaman Sridhar, Mark Rodder
  • Publication number: 20060189048
    Abstract: The present invention facilitates semiconductor fabrication by providing methods of fabrication that apply tensile strain to channel regions of devices while mitigating unwanted dopant diffusion, which degrades device performance. Source/drain regions are formed in active regions of a PMOS region (102). A first thermal process is performed that activates the formed source/drain regions and drives in implanted dopants (104). Subsequently, source/drain regions are formed in active regions of an NMOS region (106). Then, a capped poly layer is formed over the device (108). A second thermal process is performed (110) that causes the capped poly layer to induce strain into the channel regions of devices. Because of the first thermal process, unwanted dopant diffusion, particularly unwanted p-type dopant diffusion, during the second thermal process is mitigated.
    Type: Application
    Filed: February 18, 2005
    Publication date: August 24, 2006
    Inventors: Manoj Mehrotra, Lahir Adam, Song Zhao, Mahalingam Nandakumar
  • Publication number: 20060121681
    Abstract: The present invention provides a method for manufacturing a semiconductor device and a method for manufacturing an integrated circuit including the same. The method for manufacturing the semiconductor device, among other steps, includes forming an L-shaped spacer (410) proximate a sidewall of a gate structure (130) located over a substrate (110), and implanting halo/pocket implant regions (620) through the L-shaped spacer (410) and in the substrate (110).
    Type: Application
    Filed: December 2, 2004
    Publication date: June 8, 2006
    Applicant: Texas Instruments, Inc.
    Inventor: Mahalingam Nandakumar
  • Publication number: 20060024873
    Abstract: The present invention provides the method includes forming source/drain regions 170 in a semiconductor wafer substrate 110 adjacent a gate structure 130 located on a front side of the semiconductor wafer substrate 110. The source/drain regions 170 have a channel region 175 located between them. A first stress-inducing layer 190 is placed on a backside of the semiconductor wafer substrate 110 and is subjected to a thermal anneal to cause a stress to form in the channel region 175.
    Type: Application
    Filed: July 28, 2004
    Publication date: February 2, 2006
    Applicant: Texas Instruments, Incorporated
    Inventors: Mahalingam Nandakumar, Haowen Bu
  • Patent number: 6960499
    Abstract: A field effect transistor with a dual-counterdoped channel is disclosed. The transistor features a channel comprising a first doped region (28) and a second doped region (26) underlying the first doped region. A source and drain (32) are formed adjacent to the channel. In one embodiment of the present invention, the first doped region (28) is doped with arsenic, while the second doped region (26) is doped with phosphorus. The high charge-carrier mobility of the subsurface channel layer (28) allowing a lower channel dopant concentration to be used, which in turn allows lower source/drain pocket doping. This reduces the capacitance and response time of the transistor.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: November 1, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: Mahalingam Nandakumar, Karthik Vasanth, Ih-Chin Chen
  • Publication number: 20050170576
    Abstract: A method of fabricating a transistor (10) comprises forming source and drain regions (46) and (47) using a first sidewall (42) and (43) as a mask and forming a deep blanket source and drain regions (54) and (56) using a second sidewall (50) and (51) as a mask, the second sidewall (50) and (51) comprising at least part of the first sidewall (42) and (43).
    Type: Application
    Filed: February 23, 2005
    Publication date: August 4, 2005
    Inventor: Mahalingam Nandakumar
  • Publication number: 20050156236
    Abstract: A new MOS transistor is described. The transistor has a source/drain region that comprises 3 portions. Each portion is the result of an separate ion implant step. The combination of the three portions of the source/drain region yields a transistor of superior performance with high drive current, low sub-threshold current and gate-edge leakage.
    Type: Application
    Filed: November 1, 2004
    Publication date: July 21, 2005
    Inventors: Mahalingam Nandakumar, Seetharaman Sridhar, Mark Rodder
  • Publication number: 20050118770
    Abstract: The present invention provides a method for manufacturing a semiconductor device and a method for manufacturing an integrated circuit including the same. The method for manufacturing the semiconductor device, among other steps, includes forming a gate structure (230) over a substrate (210) and forming at least a portion of source/drain regions in the substrate (210). The method further includes annealing the substrate containing the at least a portion of source/drain regions in the presence of hydrogen, and forming an interlevel dielectric layer over the substrate (210) having previously been annealed in the presence of hydrogen.
    Type: Application
    Filed: October 1, 2004
    Publication date: June 2, 2005
    Applicant: Texas Instruments, Inc.
    Inventors: Mahalingam Nandakumar, Shaoping Tang, Haowen Bu
  • Patent number: 6882013
    Abstract: A method of fabricating a transistor (10) comprises forming source and drain regions (46) and (47) using a first sidewall (42) and (43) as a mask and forming a deep blanket source and drain regions (54) and (56) using a second sidewall (50) and (51) as a mask, the second sidewall (50) and (51) comprising at least part of the first sidewall (42) and (43).
    Type: Grant
    Filed: January 30, 2003
    Date of Patent: April 19, 2005
    Assignee: Texas Instruments Incorporated
    Inventor: Mahalingam Nandakumar
  • Patent number: 6822297
    Abstract: A short-channel NMOS transistor in a p-well, bordered laterally on each side by an isolation region and vertically by a channel stop region, has a n-source and a n-drain, each comprising a shallow region extending to the transistor gate and a deeper region recessed from the gate, and both having a depletion region when reverse biased. The shallow regions are surrounded in part by an enhanced p-doping implant pocket. The transistor further has in these regions of enhanced p-doping another region of a p-resistivity higher than the remainder of the semiconductor. These regions extend laterally approximately from the inner border of the respective shallow region to the inner border of the respective recessed region, and vertically from a depth just below the depletion regions of source and drain to approximately the top of the channel stop regions.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: November 23, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Mahalingam Nandakumar, Song Zhao, Youngmin Kim
  • Publication number: 20040224457
    Abstract: A field effect transistor with a dual-counterdoped channel is disclosed. The transistor features a channel comprising a first doped region (28) and a second doped region (26) underlying the first doped region. A source and drain (32) are formed adjacent to the channel. In one embodiment of the present invention, the first doped region (28) is doped with arsenic, while the second doped region (26) is doped with phosphorus. The high charge-carrier mobility of the subsurface channel layer (28) allowing a lower channel dopant concentration to be used, which in turn allows lower source/drain pocket doping. This reduces the capacitance and response time of the transistor.
    Type: Application
    Filed: June 14, 2004
    Publication date: November 11, 2004
    Inventors: Mahalingam Nandakumar, Karthik Vasanth, Ih-Chin Chen
  • Patent number: 6713334
    Abstract: An implant at HVGX pattern (step 102c) is provided to allow selective transistor threshold voltage Vth adjustment on the core transistors without affecting the I/O transistor threshold voltage Vt. The implant provides independently tuned either NMOS core transistors and I/O transistor Vth or PMOS core transistors and I/O transistor Vth.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: March 30, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Mahalingam Nandakumar, Youngmin Kim, Amitava Chatterjee