Patents by Inventor Manoj Mehrotra

Manoj Mehrotra 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: 20100112764
    Abstract: A process of fabricating an IC is disclosed in which a polysilicon resistor and a gate region of an MOS transistor are implanted concurrently. The concurrent implantation may be used to reduce steps in the fabrication sequence of the IC. The concurrent implantation may also be used to provide another species of transistor in the IC with enhanced performance. Narrow PMOS transistor gates may be implanted concurrently with p-type polysilicon resistors to increase on-state drive current. PMOS transistor gates over thick gate dielectrics may be implanted concurrently with p-type polysilicon resistors to reduce gate depletion. NMOS transistor gates may be implanted concurrently with n-type polysilicon resistors to reduce gate depletion, and may be implanted concurrently with p-type polysilicon resistors to provide high threshold NMOS transistors in the IC.
    Type: Application
    Filed: November 5, 2008
    Publication date: May 6, 2010
    Applicant: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Puneet Kohli
  • Patent number: 7691700
    Abstract: One aspect of the inventors' concept relates to a method of forming a semiconductor device. In this method, a gate structure is formed over a semiconductor body. A source/drain mask is patterned over the semiconductor body implanted source and drain regions are formed that are associated with the gate structure. After forming the implanted source and drain regions, a multi-stage implant is performed on the source and drain regions that comprises at least two implants where the dose and energy of the first implant varies from the dose and energy of the second implant. Other methods and devices are also disclosed.
    Type: Grant
    Filed: June 27, 2007
    Date of Patent: April 6, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Stan Ashburn, Shaoping Tang
  • Patent number: 7670917
    Abstract: In one aspect there is provided a method of manufacturing a semiconductor device comprising forming gate electrodes over a semiconductor substrate, forming source/drains adjacent the gate electrodes, depositing a stress inducing layer over the gate electrodes. A laser anneal is conducted on at least the gate electrodes subsequent to depositing the stress inducing layer at a temperature of at least about 1100° C. for a period of time of at least about 300 microseconds, and the semiconductor device is subjected to a thermal anneal subsequent to conducting the laser anneal.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: March 2, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Amitabh Jain, Manoj Mehrotra
  • Patent number: 7615458
    Abstract: A method of manufacturing a semiconductor device that includes forming a gate dielectric layer over a semiconductor substrate. A gate electrode is formed over the gate dielectric layer. A dopant is implanted into an extension region of the substrate, with an amount of the dopant remaining in a dielectric layer adjacent the gate electrode. The substrate is annealed at a temperature of about 1000° C. or greater to cause at least a portion of the amount of the dopant to diffuse into the semiconductor substrate.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: November 10, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Amitabh Jain, Manoj Mehrotra
  • Patent number: 7611939
    Abstract: There is presented a method of forming a semiconductor device. The method comprises forming gate structures including forming gate electrodes over a semiconductor substrate and forming spacers adjacent the gate electrodes. Source/drains are formed adjacent the gate structures, and a laminated stress layer is formed over the gate structure and the semiconductor substrate. The formation of the laminated stress layer includes cycling a deposition process to form a first stress layer over the gate structures and the semiconductor substrate and at least a second stress layer over the first stress layer. After the laminated layer is formed, it is subjected to an anneal process conducted at a temperature of about 900° C. or greater.
    Type: Grant
    Filed: May 7, 2007
    Date of Patent: November 3, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Antonio L. P. Rotondaro, Puneet Kohli
  • Publication number: 20090184348
    Abstract: Slim spacers are implemented in transistor fabrication. More particularly, wide sidewall spacers are initially formed and used to guide dopants into source/drain regions in a semiconductor substrate. The wide sidewall spacers are then removed and slim sidewall spacers are formed alongside a gate stack of the transistor. The slim spacers facilitate transferring stress from an overlying pre metal dielectric (PMD) liner to a channel of the transistor, and also facilitate reducing a resistance in the transistor by allowing silicide regions to be formed closer to the channel. This mitigates yield loss by facilitating predictable or otherwise desirable behavior of the transistor.
    Type: Application
    Filed: February 18, 2009
    Publication date: July 23, 2009
    Applicant: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Karen Hildegard Ralston Kirmse, Shirin Siddiqui
  • Publication number: 20090179280
    Abstract: Pipe defects in n-type lightly doped drain (NLDD) regions and n-type source/drain (NDS) regions are associated with arsenic implants, while excess diffusion in NLDD and NSD regions is mainly due to phosphorus interstitial movement. Carbon implanatation is commonly used to reduce phosphorus diffusion in the NLDD, but contributes to gated diode leakage (GDL). In high threshold NMOS transistors GDL is commonly a dominant off-state leakage mechanism. This invention provides a method of forming an NMOS transistor in which no carbon is implanted into the NLDD, and the NSD is formed by a pre-amorphizing implant (PAI), a phosphorus implant and a carbon species implant. Use of carbon in the NDS allows a higher concentration of phosphorus, resulting in reduced series resistance and reduced pipe defects.
    Type: Application
    Filed: January 10, 2008
    Publication date: July 16, 2009
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Puneet Kohli, Manoj Mehrotra, Shaoping Tang
  • Publication number: 20090127620
    Abstract: Semiconductor doping techniques, along with related methods and structures, are disclosed that produce components having a more tightly controlled source and drain extension region dopant profiles without significantly inducing gate edge diode leakage. The technique follows the discovery that carbon, which may be used as a diffusion suppressant for dopants such as boron, may produce a gate edge diode leakage if present in significant quantities in the source and drain extension regions. As an alternative to placing carbon in the source and drain extension regions, carbon may be placed in the source and drain regions, and the thermal anneal used to activate the dopant may be relied upon to diffuse a small concentration of the carbon into the source and drain extension regions, thereby suppressing dopant diffusion in these regions without significantly inducing gate edge diode leakage.
    Type: Application
    Filed: November 16, 2007
    Publication date: May 21, 2009
    Inventors: Puneet Kohli, Nandakumar Mahalingam, Manoj Mehrotra, Song Zhao
  • Patent number: 7524777
    Abstract: The invention provides a method for manufacturing a semiconductor device. The method for manufacturing the semiconductor device, among others, may include forming one or more layers of material within an opening in a substrate, the opening and the one or more layers forming at least a portion of an isolation structure, and subjecting at least one of the one or more layers to an energy beam treatment, the energy beam treatment configured to change a stress of the one or more layers subjected thereto, and thus change a stress in the substrate.
    Type: Grant
    Filed: December 14, 2006
    Date of Patent: April 28, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Puneet Kohli, Manoj Mehrotra, Jin Zhao, Sameer Ajmera
  • Publication number: 20090090990
    Abstract: Provided is a method for manufacturing a gate dielectric. This method, without limitation, includes subjecting a silicon substrate to a first plasma nitridation process to incorporate a nitrogen region therein. This method further includes growing a dielectric material layer over the nitrogen region using a nitrogen containing oxidizer gas, and subjecting the dielectric material layer to a second plasma nitridation process, thereby forming a nitrided dielectric material layer over the nitrogen region.
    Type: Application
    Filed: October 9, 2007
    Publication date: April 9, 2009
    Applicant: Texas Instruments, Incorporated
    Inventors: Hiroaki Niimi, Manoj Mehrotra
  • Patent number: 7510923
    Abstract: Slim spacers are implemented in transistor fabrication. More particularly, wide sidewall spacers are initially formed and used to guide dopants into source/drain regions in a semiconductor substrate. The wide sidewall spacers are then removed and slim sidewall spacers are formed alongside a gate stack of the transistor. The slim spacers facilitate transferring stress from an overlying pre metal dielectric (PMD) liner to a channel of the transistor, and also facilitate reducing a resistance in the transistor by allowing silicide regions to be formed closer to the channel. This mitigates yield loss by facilitating predictable or otherwise desirable behavior of the transistor.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: March 31, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Karen Hildegard Ralston Kirmse, Shirin Siddiqui
  • Publication number: 20090065880
    Abstract: In one aspect there is provided a method of manufacturing a semiconductor device comprising forming gate electrodes over a semiconductor substrate, forming source/drains adjacent the gate electrodes, depositing a stress inducing layer over the gate electrodes. A laser anneal is conducted on at least the gate electrodes subsequent to depositing the stress inducing layer at a temperature of at least about 1100° C. for a period of time of at least about 300 microseconds, and the semiconductor device is subjected to a thermal anneal subsequent to conducting the laser anneal.
    Type: Application
    Filed: September 11, 2007
    Publication date: March 12, 2009
    Applicant: Texas Instruments Incorporated
    Inventors: Amitabh Jain, Manoj Mehrotra
  • Publication number: 20090004803
    Abstract: One aspect of the inventors' concept relates to a method of forming a semiconductor device. In this method, a gate structure is formed over a semiconductor body. A source/drain mask is patterned over the semiconductor body implanted source and drain regions are formed that are associated with the gate structure. After forming the implanted source and drain regions, a multi-stage implant is performed on the source and drain regions that comprises at least two implants where the dose and energy of the first implant varies from the dose and energy of the second implant. Other methods and devices are also disclosed.
    Type: Application
    Filed: June 27, 2007
    Publication date: January 1, 2009
    Inventors: Manoj Mehrotra, Stan Ashburn, Shaoping Tang
  • Publication number: 20080318387
    Abstract: A method of manufacturing a semiconductor device that includes forming a gate dielectric layer over a semiconductor substrate. A gate electrode is formed over the gate dielectric layer. A dopant is implanted into an extension region of the substrate, with an amount of the dopant remaining in a dielectric layer adjacent the gate electrode. The substrate is annealed at a temperature of about 1000° C. or greater to cause at least a portion of the amount of the dopant to diffuse into the semiconductor substrate.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 25, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: Amitabh Jain, Manoj Mehrotra
  • 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: 7465635
    Abstract: The present invention provides a method for manufacturing a semiconductor device. The method for manufacturing the semiconductor device, among other steps, may include forming a gate structure over a substrate, forming at least a portion of gate sidewall spacers proximate sidewalls of the gate structure, and subjecting the at least a portion of the gate sidewall spacers to an energy beam treatment, the energy beam treatment configured to change a stress of the at least a portion of the gate sidewall spacers, and thus change a stress in the substrate therebelow.
    Type: Grant
    Filed: September 21, 2006
    Date of Patent: December 16, 2008
    Assignee: Texas Instruments Incorporated
    Inventors: Puneet Kohli, Manoj Mehrotra, Jin Zhao, Sameer Ajmera
  • Publication number: 20080277730
    Abstract: There is presented a method of forming a semiconductor device. The method comprises forming gate structures including forming gate electrodes over a semiconductor substrate and forming spacers adjacent the gate electrodes. Source/drains are formed adjacent the gate structures, and a laminated stress layer is formed over the gate structure and the semiconductor substrate. The formation of the laminated stress layer includes cycling a deposition process to form a first stress layer over the gate structures and the semiconductor substrate and at least a second stress layer over the first stress layer. After the laminated layer is formed, it is subjected to an anneal process conducted at a temperature of about 900° C. or greater.
    Type: Application
    Filed: May 7, 2007
    Publication date: November 13, 2008
    Applicant: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Antonio L.P Rotondaro, Puneet Kohli
  • Publication number: 20080268628
    Abstract: The disclosure relates to a method of forming an n-type doped active area on a semiconductor substrate that presents an improved placement profile. The method comprises the placement of arsenic in the presence of a carbon-containing arsenic diffusion suppressant in order to reduce the diffusion of the arsenic out of the target area during heat-induced annealing. The method may additionally include the placement of an amorphizer, such as germanium, in the target area in order to reduce channeling of the arsenic ions through the crystalline lattice. The method may also include the use of arsenic in addition to another n-type dopant, e.g. phosphorus, in order to offset some of the disadvantages of a pure arsenic dopant. The disclosure also relates to a semiconductor component, e.g. an NMOS transistor, formed in accordance with the described methods.
    Type: Application
    Filed: April 25, 2007
    Publication date: October 30, 2008
    Inventors: Puneet Kohli, Manoj Mehrotra, Antonio Luis Pacheco Rotondaro, Stan Ashburn, Nandakumar Mahalingam, Amitabh Jain
  • Publication number: 20080233702
    Abstract: One embodiment of the present invention relates to a method of processing a semiconductor device. During the method an amorphization implant is performed to amorphize a selected region of a semiconductor structure. The amorphized selected region is then removed by performing a recess etch that is selective thereto. Other methods and systems are also disclosed.
    Type: Application
    Filed: March 22, 2007
    Publication date: September 25, 2008
    Inventor: Manoj Mehrotra
  • Publication number: 20080157292
    Abstract: A method for manufacturing a semiconductor device featuring a high-stress dielectric layer is disclosed. The method involves the deposition of a comparatively thick liner layer that exerts increased strain on an underlying gate and active areas, resulting in enhanced carrier mobility through the transistor and heightened transistor performance. The method also involves the amelioration of fabrication problems that might arise from the deposition of a comparatively thick liner layer by forming such layer with at least a partially direction deposition process. Also disclosed are semiconductor devices manufactured in accordance with the disclosed methods.
    Type: Application
    Filed: February 7, 2007
    Publication date: July 3, 2008
    Inventors: Manoj Mehrotra, Stan Ashburn