Patents Represented by Attorney Todd M. C. Li
  • Patent number: 6333220
    Abstract: A semiconductor structure is provided along with a corresponding method of producing such a structure. The method and structure may include providing a semiconductor substrate, a gate insulator over the semiconductor substrate, a conductor comprising intrinsic polysilicon over the gate insulator, a silicide layer over the polysilicon and an insulating cap over the silicide layer. Insulating spacers may be provided along sides of the silicide layer and the insulating cap. The polysilicon may be doped with a first conductive type dopant. The first conductive type dopant may be spread over the polysilicon to form a doped polysilicon layer. A gate sidewall layer may be formed on sides of the doped polysilicon layer. A bird's beak of the gate sidewall layer may also be formed in a corner of the polysilicon.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: December 25, 2001
    Assignee: International Business Machines Corporation
    Inventors: Jack A. Mandelman, Ramachandra Divakaruni
  • Patent number: 6294835
    Abstract: The present invention relates generally to a new sequence of methods and materials to improve the process yield and to enhance the reliability of multilevel interconnection with sub-half-micron geometry by making judicious use of composite insulators to prevent metal thinning over hard metal via plugs and by preventing process induced metal spike formation. The method takes advantage of the double damascene process. The metal spikes and the metal thinning resulting from over etch process is prevented in this method by using a pair of insulators which require different chemistries for etching.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: September 25, 2001
    Assignee: International Business Machines Corporation
    Inventors: Hormazdyar M. Dalal, Du Binh Nguyen, Hazara S. Rathore
  • Patent number: 6284593
    Abstract: A process of forming a hybrid memory cell which is scalable to a minimum feature size, F, of about 60 nm at an operating voltage of Vblh of about 1.5 V and substantially free of floating-well effects is provided.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: September 4, 2001
    Assignee: International Business Machines Corporation
    Inventors: Jack A. Mandelman, Ramachandra Divakaruni, Carl J. Radens
  • Patent number: 6278317
    Abstract: A charge pump generator system and method is provided in which one or more charge pumps are operated at multiple charging rates depending upon the level reached by a voltage supply. The system includes a limiter which provides a control signal based upon the level of the voltage supply. The control signal selects the frequency of a multiple frequency oscillator coupled thereto. The selected frequency determines the charge transfer rate of a charge pump used to maintain the voltage supply.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: August 21, 2001
    Assignees: International Business Machines Corporation, Infineon Technologies North America Corporation
    Inventors: Louis L. C. Hsu, Oliver Weinfurtner, Matthew R. Wordeman
  • Patent number: 6278171
    Abstract: A method for forming an interconnect wiring structure, such as a fuse structure, comprises forming an opening in an insulating layer using a phase shift mask (the opening having vertical sidewalls sloped sidewalls and horizontal surfaces), depositing a conductive material in the opening and removing the conductive material from the sloped sidewalls and horizontal surfaces, wherein the conductive material remains on the vertical sidewalls as fuse links.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: August 21, 2001
    Assignee: International Business Machines Corporation
    Inventors: Kenneth C. Arndt, Louis L. Hsu, Jack A. Mandelman, K. Paul Muller
  • Patent number: 6275381
    Abstract: The present invention relates generally to a new apparatus and method for introducing thermal paste into semiconductor packages. More particularly, the invention encompasses an apparatus and a method that uses at least one preform of thermal paste for the cooling of at least one chip in a sealed semiconductor package. The thermal paste preform is subcooled, and is transferred onto a module component from a separable transfer sheet, or is placed onto the module component using an attached and/or imbedded mesh. The preform of thermal paste may be of simple or complex shape, and enables cooling of one or more chips in a module.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: August 14, 2001
    Assignee: International Business Machines Corporation
    Inventors: David L. Edwards, Glenn G. Daves, Shaji Farooq, Sushumna Iruvanti, Frank L. Pompeo
  • Patent number: 6275096
    Abstract: A charge pump generator system and method is provided which more precisely maintains the level of an internally generated voltage supply by operating some or all of the available charge pumps depending upon the voltage level reached by the voltage supply. When the voltage supply is far from its target level, a first group and a second group of charge pumps are operated. The first group may preferably have a faster pumping rate or a greater number of charge pumps than the second group. When the voltage supply exceeds a first predetermined level, the first group of charge pumps is switched off while the second group remains on, such that the rate of charge transfer slows. The second group continues operating until a second, e.g. target, voltage level is exceeded. The slower rate of charge transfer then effective reduces overshoot, ringing and noise coupled onto the voltage supply line. Preferably, at least one charge pump operates in both standby and active modes, thereby reducing chip area.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: August 14, 2001
    Assignees: International Business Machines Corporation, Infineon Technologies North America Corp.
    Inventors: Louis L. C. Hsu, Oliver Weinfurtner, Matthew R. Wordeman
  • Patent number: 6261894
    Abstract: Methods of preparing dual workfunction high-performance support metal oxide semiconductor field effect transistor (MOSFETs)/embedded dynamic random access (EDRAM) arrays are provided. The methods describe herein reduce the number of deep-UV masks used in the forming memory structure, decouple the support and arraying processing steps, provide salicided gates, source/drain regions and bitlines, and provide, in some instances, local interconnects at no additional processing costs. Dual workfunction high-performance support MOSFETs/ EDRAM arrays having a gate conductor guard ring and/or local interconnections are also provided.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: July 17, 2001
    Assignee: International Business Machines Corporation
    Inventors: Jack A. Mandelman, Ramachandra Divakaruni, Carl J. Radens
  • Patent number: 6259135
    Abstract: An integrated circuit having modular scalable device widths based on vertical height of the devices above the substrate plane. Different device widths are obtained in the same circuit and on the same chip based on the depth of etch in making the vertical devices or on the parallel connection of multiple device gate widths. Thereby pitch limited circuits are made in a 3-dimensional form to increase packing density of pitch limited integrated circuits within a memory array.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: July 10, 2001
    Assignee: International Business Machines Corporation
    Inventors: Louis L. C. Hsu, Carl J. Radens
  • Patent number: 6255158
    Abstract: A dynamic random access memory (DRAM) device. The DRAM device is formed in a substrate having a top surface and a trench with a sidewall formed in the substrate. A signal storage node is formed using a bottom portion of the trench and a signal transfer device is formed using an upper portion of the trench.
    Type: Grant
    Filed: September 22, 2000
    Date of Patent: July 3, 2001
    Assignee: International Business Machines Corporation
    Inventors: Toshiharu Furukawa, Ulrike Gruening, David V. Horak, Jack A. Mandelman, Carl J. Radens, Thomas S. Rupp
  • Patent number: 6255157
    Abstract: A structure and method for forming an integrated circuit structure including forming at least one transistor structure, forming at least one ferroelectric capacitor above the transistor structure, annealing the ferroelectric capacitor, and forming at least one conductive contact between the transistor structure and the ferroelectric capacitor.
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: July 3, 2001
    Assignee: International Business Machines Corporation
    Inventors: Louis L. Hsu, David E. Kotecki, Jack A. Mandelman
  • Patent number: 6245651
    Abstract: A method for simultaneously forming a line interconnect such as a bitline and a borderless contact to diffusion, e.g. bitline contact, is described. A semiconductor substrate having prepatterned gate stacks thereon is covered with a first dielectric to form a first level and then a second dielectric is deposited which forms a second level. Line interconnect openings are defined in the second level by lithography and etching. Etching is continued down to monocrystalline regions in an array region of the substrate to form borderless contact openings coincident to the line interconnects between the gate stacks. The openings are filled with one or more conductors to form contacts to diffusion, e.g. bitline contacts, which are coincident to the line interconnects, e.g. bitlines.
    Type: Grant
    Filed: January 12, 2000
    Date of Patent: June 12, 2001
    Assignee: Intenational Business Machines Corporation
    Inventors: Rama Divakaruni, Larry Alan Nesbit, Carl John Radens
  • Patent number: 6242310
    Abstract: A method and structure for forming an integrated circuit memory device includes forming a trench conductor in a trench, forming an isolation collar along a perimeter of an upper portion of the trench conductor, forming supporting spacers above the isolation collar, forming a sacrificial layer between the supporting spacers along an upper surface of the trench conductor, forming an insulator above the sacrificial layer, forming a gate conductor above the insulator, removing the sacrificial layer to form a gap between the insulator and the trench conductor, wherein the supporting spacers maintain a relative position of the gate conductor, the insulator and the trench conductor and forming a conductive strap in the gap.
    Type: Grant
    Filed: February 22, 1999
    Date of Patent: June 5, 2001
    Assignee: International Business Machines Corporation
    Inventors: Ramachandra Divakaruni, Jack A. Mandelman
  • Patent number: 6222244
    Abstract: A semiconductor fuse is positioned between conductors for connecting wiring lines. The fuse comprises spacers positioned on adjacent ones of the conductors, and a fuse element positioned between the spacers and connected to the wiring lines. A space between the conductors comprises a first width comprising a smallest possible photolithographic width and the fuse element has a second width smaller than the first width.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: April 24, 2001
    Assignee: International Business Machines Corporation
    Inventors: Kenneth C. Arndt, Dureseti Chidambarrao, Louis L. Hsu, Jack A. Mandelman, Carl Radens
  • Patent number: 6210995
    Abstract: In order to form a cavity for a fusible link in a semiconductor device, an etchable material is applied over and around a portion of the fusible link and the etchable material is coated with a protection layer. The access abutting the etchable material is formed through the protection layer. After the removal of the etchable material, the access is partially filled with a refilling material to thereby form the cavity.
    Type: Grant
    Filed: September 9, 1999
    Date of Patent: April 3, 2001
    Assignees: International Business Machines Corporation, Infineon Technologies North America Corp.
    Inventors: Axel C. Brintzinger, Jeffrey Gambino, Thomas Rupp, Scott Halle
  • Patent number: 6190986
    Abstract: A method for forming an interconnect wiring structure, such as a fuse structure, comprises forming an opening in an insulating layer using a phase shift mask (the opening having vertical sidewalls sloped sidewalls and horizontal surfaces), depositing a conductive material in the opening and removing the conductive material from the sloped sidewalls and horizontal surfaces, wherein the conductive material remains on the vertical sidewalls as fuse links.
    Type: Grant
    Filed: January 4, 1999
    Date of Patent: February 20, 2001
    Assignee: International Business Machines Corporation
    Inventors: Kenneth C. Arndt, Louis L. Hsu, Jack A. Mandelman, K. Paul Muller
  • Patent number: 6190959
    Abstract: Disclosed herein is an arrangement of memory cells in which the spacing between back-to-back trench capacitors is defined at less than 1 F spacing. A pure phase edge mask is used to define such trench patterns having less than 1 F spacing. The reduction in the trench-to-trench spacing results in increased separation between the trench and the near edge of the gate conductor. This increase in the trench to gate conductor spacing, in turn, permits the channel doping concentration to be decreased, with a corresponding increase in ON current to be realized. In alternative embodiments, a pure phase edge mask or a blocked phase edge mask can be used to define trench patterns in which the width of trenches is increased to form storage capacitors having higher capacitance. In such embodiments, the spacing between back-to-back trenches can be reduced, such that the total separation between the outer edges of adjacent trenches is maintained at about 3 F or less.
    Type: Grant
    Filed: October 6, 1999
    Date of Patent: February 20, 2001
    Assignee: International Business Machines Corporation
    Inventors: Gary Bela Bronner, Jack Allan Mandelman, Donald James Samuels