Patents Represented by Attorney Todd M. C. Li
  • Patent number: 7326997
    Abstract: A structure and method for making includes adjacent pMOSFET and nMOSFET devices in which the gate stacks are each overlain by a stressing layer that provides compressive stress in the channel of the pMOSFET device and tensile stress in the channel of the nMOSFET device. One of the pMOSFET or nMOSFET device has a height shorter than that of the other adjacent device, and the shorter of the two devices is delineated by a discontinuity or opening in the stressing layer overlying the shorter device. In a preferred method for forming the devices a single stressing layer is formed over gate stacks having different heights to form a first type stress in the substrate under the gate stacks, and forming an opening in the stressing layer at a distance from the shorter gate stack so that a second type stress is formed under the shorter gate stack.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: February 5, 2008
    Assignee: International Business Machines Corporation
    Inventors: Huilong Zhu, Jing Wang, Bruce B. Doris, Zhibin Ren
  • Patent number: 7293354
    Abstract: A vacuum controlled fixture is provided for positioning columns on sites of an electronic substrate. The fixture includes an internal chamber having spaced apart first and second surfaces extending beneath its principal face. A regular array of column receiving holes extends from the principal face through the first surface of the chamber, and a plurality of vacuum ducts extend from ports in the second surface of the chamber to a vacuum source to evacuate the internal chamber. The ports in the second face of the chamber are laterally offset from the receiving holes in the first face of the chamber to allow seating of the interior ends of the columns on coplanar portions of the rear surface. The ports are preferably centered, equidistant from the closest adjacent receiving holes, thereby providing centering of the columns by means of a vacuum driven air flow around the latter.
    Type: Grant
    Filed: December 1, 2004
    Date of Patent: November 13, 2007
    Assignee: International Business Machines Corporation
    Inventors: Yvan Ferland, Stephane Harel, Isabel De Sousa
  • Patent number: 7267863
    Abstract: A film stack and method of forming a film stack are provided in which a first film is disposed on a substrate and a second film has an inner surface disposed on the first film. The second film has a thickness smaller than a reference thickness at which the second film would begin to dewet from the substrate if the second film were disposed directly on the substrate. However, the second film is substantially free of dewetting defects because it is disposed overlying the first film which has a first Hamaker constant having a negative value with respect to the substrate.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: September 11, 2007
    Assignee: International Business Machines Corporation
    Inventors: Colin J. Brodsky, Wai-Kin Li, Steven A. Scheer
  • Patent number: 7266798
    Abstract: A method of conveying the designer's intended electrical characteristics for a semiconductor design is provided by forming tolerance bands for a design layer of interest that take into consideration constraints from design layers that interact with and influence the features on the design layer of interest. The method determines regions, i.e. tolerance bands, within which the printed edges of features of the layer of interest will print within a predetermined criterion, and satisfy a variety of constraints, including, but not limited to, electrical, overlay and manufacturability constraints arising from the influence of features on other layers. The method may be implemented in a computer program product for execution on a computer system. The resulting tolerance bands can be used to efficiently convey the designer's intent to a lithographer, an OPC engineer or a mask manufacturer or tool.
    Type: Grant
    Filed: October 12, 2005
    Date of Patent: September 4, 2007
    Assignee: International Business Machines Corporation
    Inventors: Scott M. Mansfield, Lars W. Liebmann, Azalia Krasnoperova, Ioana Graur
  • Patent number: 7265850
    Abstract: A scatterometry target is provided in which a plurality of parallel elongated features are placed, each having a length in a lengthwise direction. A plurality of stress-relief features are disposed at a plurality of positions along the length of each elongated feature.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: September 4, 2007
    Assignee: International Business Machines Corporation
    Inventors: Charles N. Archie, Matthew J. Sendelbach
  • Patent number: 7261981
    Abstract: A method is disclosed for providing associated shapes of an optical lithography mask in relation to predetermined main shapes of the mask. The method includes generating simplified layout patterns from the predetermined main shapes of the mask. Such layout patterns are generated by eliminating detail of the main shapes which leads to unmanufacturable associated shapes while preserving geometrically relevant shape information. The associated shapes are then generated relative to the simplified mask patterns.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: August 28, 2007
    Assignee: International Business Machines Corporation
    Inventors: Mark A. Lavin, Lars W. Liebmann, Scott M. Mansfield, Maharaj Mukherjee, Zengqin Zhao
  • Patent number: 7242072
    Abstract: A fuse structure and method of forming the same is described, wherein the body of the fuse is formed from a crystalline semiconductor body on an insulator, preferably of a silicon-on-insulator wafer, surrounded by a fill-in dielectric. The fill-in dielectric is preferably a material that minimizes stresses on the crystalline body, such as an oxide. The body may be doped, and may also include a silicide layer on the upper surface. This fuse structure may be successfully programmed over a wide range of programming voltages and time.
    Type: Grant
    Filed: November 23, 2004
    Date of Patent: July 10, 2007
    Assignee: International Business Machines Corporation
    Inventors: Chandrasekharan Kothandaraman, Edward P. Maciejewski
  • Patent number: 7217647
    Abstract: Disclosed is a method of fabricating a field effect transistor. In the method, a gate stack on a top surface of a semiconductor substrate is formed, and then a first spacer is formed on a sidewall of the gate stack. Next, a silicide self-aligned to the first spacer is deposited in/or on the semiconductor substrate. Subsequently a second spacer covering the surface of the first spacer, and a contact liner over at least the gate stack, the second spacer and the silicide, are formed. Then an interlayer dielectric over the contact liner is deposited. Next, a metal contact opening is formed to expose the contact liner over the silicide. Finally, the opening is extended through the contact liner to expose the silicide without exposing the substrate.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: May 15, 2007
    Assignee: International Business Machines Corporation
    Inventor: Haining S. Yang
  • Patent number: 7214623
    Abstract: Disclosed herein are a system and method of polishing a layer of a substrate. The disclosed method includes providing a polishing apparatus adapted to impart relative movement between a polishing pad and a substrate having a first layer to be polished; providing a liquid medium having a pH between 4 and 11 to an interface between the substrate and the polishing pad, the liquid medium including a pH controlling substance including at least one of an acid and a base, a carbonate and a stabilizer additive comprising at least one selected from the group consisting of amino acids and polyacrylic acid; and moving at least one of the substrate and the polishing pad relative to the other to polish the layer of the substrate.
    Type: Grant
    Filed: October 13, 2003
    Date of Patent: May 8, 2007
    Assignee: International Business Machines Corporation
    Inventors: Donald J. Delehanty, James W. Hannah, Daniel M. Heenan, Fen F. Jamin, Laertis Economikos
  • Patent number: 7212257
    Abstract: A liquid crystal display (LCD) device having a side backlight unit that minimizes or eliminates extraneous bright lines on the LCD panel. The side backlight unit includes a lamp reflector and lamp disposed on a light incident side surface of a light guide plate. A light reflection layer is formed on the inner surface of the lamp reflector, and a transparent protective layer is formed on the reflection layer. The transparent protective layer has a thickness less than 5 micrometers. The lamp reflector has arm portions that sandwich the light guide plate on the front and back surfaces at the lamp side of the light guide plate. A light transmission region between the arm portions of the lamp reflector and the front and back surfaces of the light guide plate has a thickness less than 5 micrometers.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: May 1, 2007
    Assignee: International Business Machines Corporation
    Inventors: Yoshihiro Katsu, Masaru Suzuki, Michikazu Noguchi, Akiko Nishikai
  • Patent number: 7193318
    Abstract: A multiple power density packaging structure with two or more semiconductor chips on a common wiring substrate having a common thermal spreader with a planar surface in thermal contact with the non-active surfaces of the chips. The semiconductor chips have different cooling requirements and some of the chips are thinned to insure that the chips requiring the lowest thermal resistance has the thinnest layer of a thermal adhesive or metal or solder interface between the chip and thermal spreader.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: March 20, 2007
    Assignee: International Business Machines Corporation
    Inventors: Evan G. Colgan, George A. Katopis, Chandrashekhar Ramaswamy, Herbert I. Stoller
  • Patent number: 7183613
    Abstract: A structure and method for making includes adjacent pMOSFET and nMOSFET devices in which the gate stacks are each overlain by a stressing layer that provides compressive stress in the channel of the PMOSFET device and tensile stress in the channel of the nMOSFET device. One of the PMOSFET or nMOSFET device has a height shorter than that of the other adjacent device, and the shorter of the two devices is delineated by a discontinuity or opening in the stressing layer overlying the shorter device. In a preferred method for forming the devices a single stressing layer is formed over gate stacks having different heights to form a first type stress in the substrate under the gate stacks, and forming an opening in the stressing layer at a distance from the shorter gate stack so that a second type stress is formed under the shorter gate stack.
    Type: Grant
    Filed: November 15, 2005
    Date of Patent: February 27, 2007
    Assignee: International Business Machines Corporation
    Inventors: Huilong Zhu, Jing Wang, Bruce B. Doris, Zhibin Ren
  • Patent number: 7151023
    Abstract: A MOSFET structure and method of forming is described. The method includes forming a metal-containing layer that is thick enough to fully convert the semiconductor gate stack to a semiconductor metal alloy in a first MOSFET type region but only thick enough to partially convert the semiconductor gate stack to a semiconductor metal alloy in a second MOSFET type region. In one embodiment, the gate stack in a first MOSFET region is recessed prior to forming the metal-containing layer so that the height of the first MOSFET semiconductor stack is less than the height of the second MOSFET semiconductor stack. In another embodiment, the metal-containing layer is thinned over one MOSFET region relative to the other MOSFET region prior to the conversion process.
    Type: Grant
    Filed: August 1, 2005
    Date of Patent: December 19, 2006
    Assignee: International Business Machines Corporation
    Inventors: Hasan M. Nayfeh, Mahender Kumar, Sunfei Fang, Jakub T Kedzierski, Cyril Cabral, Jr.
  • Patent number: 7147976
    Abstract: A method of forming a photolithographic mask layout with Sub-Resolution Assist Feature (SRAF) elements on a mask for correcting for proximity effects for a pattern imaged comprising the steps of developing a layout of mask features for printing main pattern features. Provide a table of SRAF element data including spacing of main pattern features and SRAF elements, applying SRAF elements to the mask layout as a function of spacing of main pattern features and SRAF elements, legalizing the SRAF elements as a function of style options, and providing a target pattern comprising a modified layout for the mask, identifying problem edge segments of an SRAF element of the target pattern at risk of causing a printing defect, applying a selected bias to the problem edge segments to modify the pattern where there are areas of SRAF element loss, and providing an output of a modified pattern with modified SRAF elements removing the areas of SRAF element loss.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: December 12, 2006
    Assignee: International Business Machines Corporation
    Inventors: Lars W. Liebmann, Richard A. Ferguson, Allen H. Gabor, Mark A. Lavin
  • Patent number: 7142621
    Abstract: There is disclosed a data recovery (DR) circuit including an over sampling (OS) circuit, a transition detection (TD) circuit and a sample selection/data alignment (SSDA) circuit. A multiphase clock generating circuit delivering n phases is coupled to each of these circuits. The OS circuit over samples the received digital data stream and produces n sampled signals at each clock period. The TD circuit is configured to detect a data transition (if any) and to generate n select signals, only one of which is active and represents a determined delay with respect to the transition position, indicating thereby which over sampled signal is the best to be retained. The SSDA circuit is configured to generate the recovered (retimed) data signal that is aligned with a predefined phase of the multiphase clock signal. The data recovery circuit is well adapted to high speed serial data communications between integrated circuits/systems on digital networks.
    Type: Grant
    Filed: October 24, 2002
    Date of Patent: November 28, 2006
    Assignee: International Business Machines Corporation
    Inventors: Vincent Vallet, Philippe Hanviller
  • Patent number: 7135724
    Abstract: A field effect transistor (“FET”) is provided which includes a gate stack overlying a single-crystal semiconductor region of a substrate, a pair of first spacers disposed over sidewalls of said gate stack, and a pair of regions consisting essentially of a single-crystal semiconductor alloy which are disposed on opposite sides of the gate stack. Each of the semiconductor alloy regions is spaced a first distance from the gate stack. The source region and drain region of the FET are at least partly disposed in respective ones of the semiconductor alloy regions, such that the source region and the drain region are each spaced a second distance from the gate stack by a first spacer of the pair of first spacers, the second distance being different from the first distance.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: November 14, 2006
    Assignees: International Business Machines Corporation, Kabushiki Kaisha Toshiba
    Inventors: Huajie Chen, Dureseti Chidambarrao, Sang-Hyun Oh, Siddhartha Panda, Werner A. Rausch, Tsutomu Sato, Henry K. Utomo
  • Patent number: 7091103
    Abstract: CMP of integrated circuits containing DRAM arrays with trench capacitors fill the trenches with oxide, resulting in a an array of oxide structures that is dense compared with the concentration in the surrounding support structures and therefore has a higher loading. A conformal layer is deposited over the wafer, increasing the loading in the array, but filling in spaces between active areas. A blanket etch removes material in both the array and the supports. A block etch balances the amount of material in the array and the supports. A supplementary oxide deposition in the array fills spaces between the structures to a nearly uniform density.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: August 15, 2006
    Assignees: International Business Machines Corporation, Infineon Technologies North America Corporation
    Inventors: Jochen Beintner, Laertis Economikos, Michael Wise, Andreas Knorr
  • Patent number: 7043712
    Abstract: A method of designing lithographic masks is provided where mask segments used in a model-based optical proximity correction (MBOPC) scheme are adaptively refined based on local image information, such as image intensity, gradient and curvature. The values of intensity, gradient and curvature are evaluated locally at predetermined evaluation points associated with each segment. An estimate of the image intensity between the local evaluation points is preferably obtained by curve fitting based only on values at the evaluation points. The decision to refine a segment is based on the deviation of the simulated image threshold contour from the target image threshold contour. The output mask layout will provide an image having improved fit to the target image, without a significant increase in computation cost.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: May 9, 2006
    Assignee: International Business Machines Corporation
    Inventors: Maharaj Mukherjee, Zachary Baum, Mark A. Lavin, Donald J. Samuels, Rama N. Singh
  • Patent number: 7001693
    Abstract: A method of forming a photolithographic mask layout with Sub-Resolution Assist Feature (SRAF) elements on a mask for correcting for proximity effects for a pattern imaged comprising the steps of developing a layout of mask features for printing main pattern features. Provide a table of SRAF element data including spacing of main pattern features and SRAF elements, applying SRAF elements to the mask layout as a function of spacing of main pattern features and SRAF elements, legalizing the SRAF elements as a function of style options, and providing a target pattern comprising a modified layout for the mask, identifying problem edge segments of an SRAF element of the target pattern at risk of causing a printing defect, applying a selected bias to the problem edge segments to modify the pattern where there are areas of SRAF element loss, and providing an output of a modified pattern with modified SRAF elements removing the areas of SRAF element loss.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: February 21, 2006
    Assignee: International Business Machines Corporation
    Inventors: Lars W. Liebmann, Richard A. Ferguson, Allen H. Gabor, Mark A. Lavin
  • Patent number: 6993741
    Abstract: A method of generating patterns of a pair of photomasks from a data set defining a circuit layout to be provided on a substrate includes identifying critical segments of the circuit layout to be provided on the substrate. Block mask patterns are generated and then legalized based on the identified critical segments. Thereafter, phase mask patterns are generated, legalized and colored. The legalized block mask patterns and the legalized phase mask patterns that have been colored define features of a block mask and an alternating phase shift mask, respectively, for use in a dual exposure method for patterning features in a resist layer of a substrate.
    Type: Grant
    Filed: July 15, 2003
    Date of Patent: January 31, 2006
    Assignee: International Business Machines Corporation
    Inventors: Lars W. Liebmann, Scott J. Bukofsky, Ioana Graur