Patents by Inventor Kaiping Liu

Kaiping Liu 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: 20060019478
    Abstract: A method for forming metal silicide regions in source and drain regions (160, 170) is described. Prior to the thermal annealing of the source and drain regions (160, 170), germanium is implanted into a semiconductor substrate adjacent to sidewall structures (90, 95) formed adjacent gate structures (60, 70). The position of the implanted germanium species in the semiconductor substrate will overlap the source and drain regions (160, 170). Following thermal annealing of the source and drain regions (160, 170), the implanted germanium prevents the formation of metal silicide spikes.
    Type: Application
    Filed: July 21, 2004
    Publication date: January 26, 2006
    Inventors: Song Zhao, Sue Crank, Amitava Chatterjee, Kaiping Liu, Jiong-Ping Lu, Donald Miles, Duofeng Yue, Lance Robertson
  • Publication number: 20050263897
    Abstract: A method of forming a semiconductor device includes implanting a precipitate into a gate conductor of an at least partially formed semiconductor device. The gate conductor including a plurality of semiconductor grains. The boundaries of adjacent grains forming a dopant migration path. A plurality of precipitate regions are formed within the gate conductor. At least some of the precipitate regions located at a junction of at least two grains. The gate conductor of the at least partially formed semiconductor device is doped with a dopant. The dopant diffuses inwardly along the dopant migration path.
    Type: Application
    Filed: July 15, 2005
    Publication date: December 1, 2005
    Inventors: Kaiping Liu, Zhiqiang Wu, Jihong Chen
  • Patent number: 6955980
    Abstract: A method of forming a semiconductor device includes implanting a precipitate into a gate conductor of an at least partially formed semiconductor device. The gate conductor including a plurality of semiconductor grains. The boundaries of adjacent grains forming a dopant migration path. A plurality of precipitate regions are formed within the gate conductor. At least some of the precipitate regions located at a junction of at least two grains. The gate conductor of the at least partially formed semiconductor device is doped with a dopant. The dopant diffuses inwardly along the dopant migration path.
    Type: Grant
    Filed: August 30, 2002
    Date of Patent: October 18, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: Kaiping Liu, Zhiqiang Wu, Jihong Chen
  • Publication number: 20050212041
    Abstract: A method of forming an associated transistor is presented whereby short channel effects and junction capacitances are mitigated and enhanced switching speeds are thereby facilitated. Compensation regions are formed within a substrate by implanting dopants relatively deeply over source and drain regions formed within the substrate. The compensation regions are spaced apart slightly less than are the source and drain regions. This spacing affects potential contours and reduces junction capacitances within the transistor. The different distances between the source and drain regions and the compensation regions are achieved by forming and selectively adjusting sidewall spacers adjacent to a gate structure of the transistor. These spacers serve as guides for the dopants implanted into the substrate to form the source and drain regions and the compensation regions.
    Type: Application
    Filed: May 11, 2005
    Publication date: September 29, 2005
    Inventors: Zhiqiang Wu, Jihong Chen, Kaiping Liu
  • Patent number: 6940137
    Abstract: The present invention provides a semiconductor device 200 having an angled compensation implant, a method of manufacture therefore and a method of manufacturing an integrated circuit including the angled compensation implant. In one embodiment, the method of manufacturing the semiconductor device 200 includes creating a halo implant 240 in a substrate 210, introducing a compensation implant 260 in the substrate 210 at an angle abnormal to the substrate 210 and forming a source/drain region 250 above the compensation implant 260, the angle reducing a capacitance associated with the halo implant 240 or the source/drain region 250. The method further includes placing a gate structure 230 over the substrate 210.
    Type: Grant
    Filed: September 19, 2003
    Date of Patent: September 6, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: Jihong Chen, Zhiqiang Wu, Kaiping Liu
  • Patent number: 6913980
    Abstract: A method of forming an associated transistor is presented whereby short channel effects and junction capacitances are mitigated and enhanced switching speeds are thereby facilitated. Compensation regions are formed within a substrate by implanting dopants relatively deeply over source and drain regions formed within the substrate. The compensation regions are spaced apart slightly less than are the source and drain regions. This spacing affects potential contours and reduces junction capacitances within the transistor. The different distances between the source and drain regions and the compensation regions are achieved by forming and selectively adjusting sidewall spacers adjacent to a gate structure of the transistor. These spacers serve as guides for the dopants implanted into the substrate to form the source and drain regions and the compensation regions.
    Type: Grant
    Filed: June 30, 2003
    Date of Patent: July 5, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: Zhiqiang Wu, Jihong Chen, Kaiping Liu
  • Publication number: 20050093032
    Abstract: The present invention provides a transistor 100 having a germanium implant region 170 located therein, a method of manufacture therefor, and an integrated circuit including the aforementioned transistor. The transistor 100, in one embodiment, includes a polysilicon gate electrode 140 located over a semiconductor substrate 110, wherein a sidewall of the polysilicon gate electrode 140 has a germanium implanted region 170 located therein. The transistor 100 further includes source/drain regions 160 located within the semiconductor substrate 110 proximate the polysilicon gate electrode 140.
    Type: Application
    Filed: November 5, 2003
    Publication date: May 5, 2005
    Applicant: Texas Instruments, Incorporated
    Inventors: Kaiping Liu, Zhiqiang Wu, Majid Mansoorz
  • Publication number: 20050062103
    Abstract: The present invention provides a semiconductor device 200 having an angled compensation implant, a method of manufacture therefore and a method of manufacturing an integrated circuit including the angled compensation implant. In one embodiment, the method of manufacturing the semiconductor device 200 includes creating a halo implant 240 in a substrate 210, introducing a compensation implant 260 in the substrate 210 at an angle abnormal to the substrate 210 and forming a source/drain region 250 above the compensation implant 260, the angle reducing a capacitance associated with the halo implant 240 or the source/drain region 250. The method further includes placing a gate structure 230 over the substrate 210.
    Type: Application
    Filed: September 19, 2003
    Publication date: March 24, 2005
    Applicant: Texas Instruments, Incorporated
    Inventors: Jihong Chen, Zhiqiang Wu, Kaiping Liu
  • Publication number: 20050012149
    Abstract: The present invention provides a semiconductor device 200 having a localized halo implant 250 located therein, a method of manufacture therefore and an integrated circuit including the semiconductor device. In one embodiment, the semiconductor device 200 includes a gate 244 located over a substrate 210, the substrate 210 having a source and a drain 230 located therein. In the same embodiment, located adjacent each of the source and drain 230 are localized halo implants 250, each of the localized halo implants 250 having a vertical implant region 260 and an angled implant region 265. Further, at an intersection of the vertical implant region 260 and the angled implant region 265 is an area of peak concentration.
    Type: Application
    Filed: August 5, 2004
    Publication date: January 20, 2005
    Inventors: Kaiping Liu, Zhiqiang Wu
  • Publication number: 20040266121
    Abstract: A method of forming an associated transistor is presented whereby short channel effects and junction capacitances are mitigated and enhanced switching speeds are thereby facilitated. Compensation regions are formed within a substrate by implanting dopants relatively deeply over source and drain regions formed within the substrate. The compensation regions are spaced apart slightly less than are the source and drain regions. This spacing affects potential contours and reduces junction capacitances within the transistor. The different distances between the source and drain regions and the compensation regions are achieved by forming and selectively adjusting sidewall spacers adjacent to a gate structure of the transistor. These spacers serve as guides for the dopants implanted into the substrate to form the source and drain regions and the compensation regions.
    Type: Application
    Filed: June 30, 2003
    Publication date: December 30, 2004
    Inventors: Zhiqiang Wu, Jihong Chen, Kaiping Liu
  • Patent number: 6794235
    Abstract: The present invention provides a semiconductor device 200 having a localized halo implant 250 located therein, a method of manufacture therefore and an integrated circuit including the semiconductor device. In one embodiment, the semiconductor device 200 includes a gate 244 located over a substrate 210, the substrate 210 having a source and a drain 230 located therein. In the same embodiment, located adjacent each of the source and drain 230 are localized halo implants 250, each of the localized halo implants 250 having a vertical implant region 260 and an angled implant region 265. Further, at an intersection of the vertical implant region 260 and the angled implant region 265 is an area of peak concentration.
    Type: Grant
    Filed: June 5, 2003
    Date of Patent: September 21, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Kaiping Liu, Zhiqiang Wu
  • Publication number: 20040166611
    Abstract: Methods are discussed for forming a localized halo structure and a retrograde profile in a substrate of a semiconductor device. The method comprises providing a gate structure over the semiconductor substrate, wherein a dopant material is implanted at an angle around the gate structure to form a halo structure in a source/drain region of the substrate and underlying a portion of the gate structure. A trench is formed in the source/drain region of the semiconductor substrate thereby removing at least a portion of the halo structure in the source/drain region. A silicon material layer is then formed in the trench using an epitaxial deposition.
    Type: Application
    Filed: February 24, 2004
    Publication date: August 26, 2004
    Inventor: Kaiping Liu
  • Patent number: 6743684
    Abstract: Methods are discussed for forming a localized halo structure and a retrograde profile in a substrate of a semiconductor device. The method comprises providing a gate structure over the semiconductor substrate, wherein a dopant material is implanted at an angle around the gate structure to form a halo structure in a source/drain region of the substrate and underlying a portion of the gate structure. A trench is formed in the source/drain region of the semiconductor substrate thereby removing at least a portion of the halo structure in the source/drain region. A silicon material layer is then formed in the trench using an epitaxial deposition.
    Type: Grant
    Filed: October 11, 2002
    Date of Patent: June 1, 2004
    Assignee: Texas Instruments Incorporated
    Inventor: Kaiping Liu
  • Publication number: 20040079992
    Abstract: A method of fabricating a transistor comprises forming a gate structure outwardly of a semiconductor substrate, wherein the gate structure comprises a gate, a gate insulator and sidewalls and forming source region and a drain region in the substrate using the gate structure as a mask, wherein a channel is defined in the substrate between the source region and the drain region. A bottomwall/sidewall junction capacitance reduction region extending within and between the source region and the drain region is formed, wherein the bottomwall/sidewall junction capacitance reduction region extends at least partially through the bottomwall junction or the sidewall junction.
    Type: Application
    Filed: October 22, 2003
    Publication date: April 29, 2004
    Inventors: Manoj Mehrotra, Kaiping Liu
  • Patent number: 6727131
    Abstract: A method of forming a semiconductor device is provided that comprises forming a gate conductor proximate to and insulated from an outer surface of a semiconductor substrate. The gate conductor defines a channel region disposed inwardly from the gate conductor. Source and drain regions are formed in the semiconductor substrate, each disposed adjacent one edge of the channel region. The semiconductor substrate and the source and drain regions have an associated bottom wall junction capacitance. A transient enhanced diffusion anneal is used to affect ion concentration profiles associated with the source and drain regions, resulting in an increased balance in the ion concentration profiles of the source and drain regions and an ion concentration associated with the semiconductor substrate, which results in reduction of the bottom wall junction capacitance.
    Type: Grant
    Filed: October 24, 2002
    Date of Patent: April 27, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Zhiqiang Wu, Kaiping Liu
  • Publication number: 20040072395
    Abstract: Methods are discussed for forming a localized halo structure and a retrograde profile in a substrate of a semiconductor device. The method comprises providing a gate structure over the semiconductor substrate, wherein a dopant material is implanted at an angle around the gate structure to form a halo structure in a source/drain region of the substrate and underlying a portion of the gate structure. A trench is formed in the source/drain region of the semiconductor substrate thereby removing at least a portion of the halo structure in the source/drain region. A silicon material layer is then formed in the trench using an epitaxial deposition.
    Type: Application
    Filed: October 11, 2002
    Publication date: April 15, 2004
    Inventor: Kaiping Liu
  • Patent number: 6713360
    Abstract: The present invention provides a method for forming a transistor junction in a semiconductor wafer by implanting a dopant material (116) into the semiconductor wafer, implanting a halo material (110) into the semiconductor wafer (102), selecting a fluorine dose and energy to tailor one or more characteristics of the transistor, implanting fluorine into the semiconductor wafer at the selected dose and energy, activating the dopant material using a thermal process and annealing the semiconductor wafer to remove residual fluorine. The one or more characteristics of the transistor may include halo segregation, halo diffusion, the sharpness of the halo profile, dopant activation, dopant profile sharpness, drive current, bottom wall capacitance or near edge capacitance.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: March 30, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Amitabh Jain, Kaiping Liu, Zhiqiang Wu
  • Publication number: 20040043543
    Abstract: A method of forming a semiconductor device includes implanting a precipitate into a gate conductor of an at least partially formed semiconductor device. The gate conductor including a plurality of semiconductor grains. The boundaries of adjacent grains forming a dopant migration path. A plurality of precipitate regions are formed within the gate conductor. At least some of the precipitate regions located at a junction of at least two grains. The gate conductor of the at least partially formed semiconductor device is doped with a dopant. The dopant diffuses inwardly along the dopant migration path.
    Type: Application
    Filed: August 30, 2002
    Publication date: March 4, 2004
    Applicant: Texas Instruments Incorporated
    Inventors: Kaiping Liu, Zhiqiang Wu, Jihong Chen
  • Patent number: 6677208
    Abstract: A method of fabricating a transistor comprises forming a gate structure outwardly of a semiconductor substrate, wherein the gate structure comprises a gate, a gate insulator and sidewalls and forming source region and a drain region in the substrate using the gate structure as a mask, wherein a channel is defined in the substrate between the source region and the drain region. A bottomwall/sidewall junction capacitance reduction region extending within and between the source region and the drain region is formed, wherein the bottomwall/sidewall junction capacitance reduction region extends at least partially through the bottomwall junction or the sidewall junction.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: January 13, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Manoj Mehrotra, Kaiping Liu
  • Patent number: 6660605
    Abstract: Methods are discussed for forming a transistor comprising a source/drain region having both a graded HDD portion and a sharp HDD portion in a semiconductor substrate. The method comprises a dual diffusion process, wherein a gate structure is provided over the semiconductor substrate having an offset spacer associated therewith. A first dopant material is implanted around the gate structure in the source/drain area to form a grade-HDD region in the substrate that is aligned to the offset spacer. A sidewall spacer is formed around the gate structure and covers the offset spacer. A second dopant material is then implanted in the source/drain area to form a source/drain region in the substrate aligned to the sidewall spacer, and the device is thermally processed in a first anneal. The sidewall spacer and the offset spacer are removed from the gate structure.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: December 9, 2003
    Assignee: Texas Instruments Incorporated
    Inventor: Kaiping Liu