Abstract: A method of forming a SiGe layer having a relatively high Ge content includes preparing a silicon substrate; depositing a layer of SiGe to a thickness of between about 100 nm to 500 nm, wherein the Ge content of the SiGe layer is equal to or greater than 22%, by molecular weight; implanting H+ ions into the SiGe layer at a dose of between about 1·1016 cm−2 to 5·1016 cm−2, at an energy of between about 20 keV to 45 keV; thermal annealing the substrate and SiGe layer, to relax the SiGe layer, in an inert atmosphere at a temperature of between about 650° C. to 950° C. for between about 30 seconds and 30 minutes; and depositing a layer of tensile-strained silicon on the relaxed SiGe layer to a thickness of between about 5 nm to 30 nm.
Type:
Grant
Filed:
January 31, 2002
Date of Patent:
June 8, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Jer-Shen Maa, Douglas James Tweet, Sheng Teng Hsu
Abstract: A method of fabricating a self-aligned cross-point memory array includes preparing a substrate, including forming any supporting electronic structures; forming a p-well area on the substrate; implanting ions to form a deep N+ region; implanting ions to form a shallow P+ region on the N+ region to form a P+/N junction; depositing a barrier metal layer on the P+ region; depositing a bottom electrode layer on the barrier metal layer; depositing a sacrificial layer or silicon nitride layer on the bottom electrode layer; patterning and etching the structure to remove portions of the sacrificial layer, the bottom electrode layer, the barrier metal layer, the P+ region and the N+ region to form a trench; depositing oxide to fill the trench; patterning and etching the sacrificial layer; depositing a PCMO layer which is self-aligned with the remaining bottom electrode layer; depositing a top electrode layer, patterning and etching the top electrode layer, and completing the memory ar
Type:
Grant
Filed:
September 30, 2002
Date of Patent:
June 8, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Sheng Teng Hsu, Wei Pan, Wei-Wei Zhuang
Abstract: A Pb3GeO5 phase PGO thin film is provided. This film has ferroelastic properties that make it ideal for many microelectromechanical applications or as decoupling capacitors in high speed multichip modules. This PGO film is uniquely formed in a MOCVD process that permits a thin film, less than 1 mm, of material to be deposited. The process mixes Pd and germanium in a solvent. The solution is heated to form a precursor vapor which is decomposed. The method provides deposition temperatures and pressures. The as-deposited film is also annealed to enhanced the film's ferroelastic characteristics. A ferroelastic capacitor made from the present invention PGO film is also provided.
Type:
Grant
Filed:
April 14, 2003
Date of Patent:
May 18, 2004
Inventors:
Tingkai Li, Fengyan Zhang, Yoshi Ono, Sheng Teng Hsu
Abstract: A system and method are provided for laser irradiating a semiconductor substrate using a multi-pattern mask. The method comprises: exposing a semiconductor substrate to laser light projected through a multi-pattern mask; advancing the mask and substrate in a first direction to sequentially expose adjacent areas of the substrate to each of the mask patterns in a first predetermined order; and, advancing the mask and substrate in a second direction, opposite the first direction, to sequentially expose adjacent areas of the substrate to each of the mask patterns in the first order. In one aspect, the method further comprises: forming a multi-pattern mask having a first plurality patterns aligned in the first order with respect to the first direction and a second plurality of patterns, corresponding to the first plurality of patterns, aligned in the first order with respect to the second direction.
Type:
Grant
Filed:
March 13, 2002
Date of Patent:
May 11, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Apostolos Voutsas, Mark A. Crowder, Yasuhiro Mitiani
Abstract: A multi-pattern shadow mask, shadow mask laser annealing system, and a multi-pattern shadow mask method for laser annealing are provided. The method comprises: supplying a silicon substrate; supplying a multi-pattern shadow mask with a plurality of aperture patterns; creating substrate alignment marks; with respect to the alignment marks, laser annealing a substrate region in a plurality of aperture patterns; forming a corresponding plurality of polysilicon regions; and, forming a corresponding plurality of transistor channel regions in the plurality of polysilicon regions. Typically, the shadow mask includes a plurality of sections, with each section having at least one aperture pattern. A shadow mask section can be selected to create a corresponding aperture pattern. If the mask section includes a plurality of aperture patterns, the selection of a section creates all the corresponding aperture patterns in the selected section.
Abstract: A method of CMP thin films during fabrication of IC devices includes preparing a substrate, including building IC component structures on the substrate; depositing a bottom electrode on the substrate; depositing a first CMP layer having a first known CMP selectivity on the substrate; patterning the first CMP layer to form a pattern having a lower margin; forming indicator structures on the first CMP layer in the pattern; depositing a second CMP layer having a second known CMP selectivity relative to that of the first CMP layer, including depositing portions of the second CMP layer in the pattern of the first CMP layer; CMP the structure so that the indicator structures are removed and any portion of the first CMP layer and second CMP layer are removed to a level corresponding to the lower margin; and completing the IC structure.
Type:
Grant
Filed:
March 17, 2003
Date of Patent:
April 20, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Wei Pan, David R. Evans, Allen W. Burmaster
Abstract: A method of chemical vapor deposition (CVD) of copper films includes preparing a substrate, including forming structures thereon have a barrier metal exposed surface; placing the prepared substrate into a CVD chamber; heating the substrate to a temperature of between about 200° C. and 250° C.; introducing a water flow in a carrier gas for at least one minute; stopping the water flow; and starting the flow of copper precursor.
Type:
Grant
Filed:
October 16, 2001
Date of Patent:
April 13, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Wei Pan, David Russell Evans, Sheng Teng Hsu
Abstract: An integrated circuit device, and a method of manufacturing the same, comprises an epitaxial nickel silicide on (100) Si, or a stable nickel silicide on amorphous Si, fabricated with a cobalt interlayer. In one embodiment the method comprises depositing a cobalt (Co) interface layer between the Ni and Si layers prior to the silicidation reaction. The cobalt interlayer regulates the flux of the Ni atoms through the cobalt/nickel/silicon alloy layer formed from the reaction of the cobalt interlayer with the nickel and the silicon so that the Ni atoms reach the Si interface at a similar rate, i.e., without any orientation preference, so as to form a uniform layer of nickel silicide. The nickel silicide may be annealed to form a uniform crystalline nickel disilicide. Accordingly, a single crystal nickel silicide on (100) Si or on amorphous Si is achieved wherein the nickel silicide has improved stability and may be utilized in ultra-shallow junction devices.
Type:
Grant
Filed:
December 12, 2002
Date of Patent:
April 13, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Jer-shen Maa, Douglas J. Tweet, Yoshi Ono, Fengyan Zhang, Sheng Teng Hsu
Abstract: A MFMOS one transistor memory structure for ferroelectric non-volatile memory devices includes a high dielectric constant material such as ZrO2, HfO2, Y2O3, or La2O3, or the like, or mixtures thereof, to reduce the operation voltage and to increase the memory window and reliability of the device.
Type:
Grant
Filed:
December 12, 2002
Date of Patent:
April 6, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Tingkai Li, Sheng Teng Hsu, Hong Ying, Bruce D. Ulrich, Yanjun Ma
Abstract: A method of adhering copper thin film to a substrate in an integrated circuit structure includes preparing a substrate, including forming active regions and trenches for interconnect structures; depositing a metal barrier layer on the substrate; depositing an ultra thin film layer of tungsten over the barrier metal layer; depositing a copper thin film on the tungsten ultra thin film layer; removing excess copper and tungsten to the level of the metal barrier layer; and completing the integrated circuit structure.
Type:
Grant
Filed:
May 6, 2002
Date of Patent:
April 6, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Wei Pan, David R. Evans, Sheng Teng Hsu
Abstract: A thin film transistor includes an active silicon layer deposited by physical vapor deposition (PVD), wherein a silicon precursor is doped with impurities prior to use as a target in the PVD chamber, wherein the precursor has a resistivity in the range of about 0.5 &OHgr;-cm<&rgr;s<60 &OHgr;-cm; and wherein the target includes plural, rectangular tiles wherein all individual tiles are larger than 8.5 inches square.
Type:
Grant
Filed:
August 13, 2002
Date of Patent:
April 6, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Yukihiko Nakata, Apostolos Voutsas, John Hartzell
Abstract: A method of fabricating a CMOS have self-aligned shallow trench isolation, includes preparing a silicon substrate; forming a gate stack; depositing a layer of first polysilicon; trenching the substrate by shallow trench isolation to form a trench; filling the trench with oxide; depositing a second layer of polysilicon wherein the top surface of the second polysilicon layer is above the top surface of the first polysilicon layer; depositing a sacrificial oxide layer having a thickness of at least 1.5× that of the first polysilicon layer; CMP the sacrificial oxide layer to the level of the upper surface of the second polysilicon layer; depositing a third layer of polysilicon; patterning and etching the gate stack; implanting ions to form a source region, a drain region and the polysilicon gate; and completing the CMOS structure.
Type:
Grant
Filed:
June 25, 2003
Date of Patent:
April 6, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
David R. Evans, Sheng Teng Hsu, Bruce D. Ulrich, Douglas J. Tweet, Lisa H. Stecker
Abstract: A method is provided for maintaining profiles in a device store. The method comprises: setting a profile type; selecting profile parameters such as destinations and processes; adding the profile to a device store; and, in response to creating the profile, limiting the lifetime of the profile in the device store. Time aging profiles, single-use profiles, renewable profiles, and permanent profiles can be selected. When a time aging profile is chosen, a time-to-live (TTL) variable, referenced to the creation of the profile, is also selected. Then, the profile is purged from the store when the TTL variable expires. When a single-use profile is chosen, the profile is purged from the store after the profile is used a first time. When a renewable profile is chosen, a TTL variable is selected that is reset in response to using the profile. The profile is purged from the store if the TTL variable expires.
Abstract: A color field sequential projector includes an electronically controllable quarter waveplate positioned between a reflection device and a polarized light beam splitter, wherein the controllable quarter waveplate is switched to be optimum for particular wavebands as the illumination distribution changes during a color field sequence. The electronically controllable quarter waveplate provides for improved contrast performance and color purity in the projected image.
Abstract: A one-transistor FeRAM memory cell array includes an array of ferroelectric transistors arranged in rows and columns, each transistor having a source, a drain, a channel, a gate oxide layer over the channel and a ferroelectric stack formed on the gate oxide layer; word lines connecting the gate ferroelectric stack top electrodes of transistors in a row of the array; a connection to the channel of all transistors in the array formed by a substrate well; a set of first bit lines connecting the sources of all transistors in a column of the array; and a set of second bit lines connecting the drains of all transistors in a column of the array; wherein the ferroelectric stack has opposed edges, which, when projected to a level of the source, drain and channel, are coincident with an abutted edge of the source and the channel and the drain and the channel, respectively.
Type:
Grant
Filed:
October 28, 2002
Date of Patent:
March 23, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Sheng Teng Hsu, Jong-Jan Lee, Fengyan Zhang, Nobuyoshi Awaya
Abstract: A system and method are provided for reducing film surface protrusions in the fabrication of LILAC films. The method comprises: forming an amorphous film with a first thickness; annealing the film using a LILAC process, with beamlets having a width in the range of 3 to 10 microns; in response to annealing, forming protrusions on the film surface; optionally oxidizing the film surface; thinning the film; and, in response to thinning the film, smoothing the film surface. Typically, the film surface is smoothed to a surface flatness of 300 Å, or less. In some aspects of the method, oxidizing the film surface includes oxidizing the film surface to a depth. Then, thinning the film includes thinning the film to a third thickness equal to the first thickness minus the depth.
Type:
Grant
Filed:
October 18, 2002
Date of Patent:
March 23, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Mark A. Crowder, Apostolos T. Voutsas, Masahiro Adachi
Abstract: An MRAM device includes a substrate; plural conductive lines, including a bit line and a word line; and a MTJ stack including a pair of magnetic yoke structures, wherein each of said yoke structures surrounds a conductive line. A method of fabricating a magnetic yoke in an MRAM structure includes preparing a substrate; forming a first conductive line on the substrate; fabricating a MTJ stack, including fabricating a first magnetic yoke structure about the first conductive line; forming a second conductive line on the MTJ stack; fabricating a second magnetic yoke about the second conductive line; depositing a layer of oxide on the structure; and metallizing the structure.
Abstract: A method of adjusting the threshold voltage in an ultra-thin SOI MOS transistor includes preparing a SOI substrate; thinning the SOI top silicon film to a thickness of between about 10 nm and 50 nm; forming an absorption layer on the top silicon film; and implanting ions into the top silicon film through the absorption layer.
Abstract: A method of fabricating a Si1−XGeX film on a silicon substrate includes preparing a silicon substrate; epitaxially depositing a Si1−XGeX layer on the silicon substrate forming a Si1−XGeX/Si interface there between; amorphizing the Si1−XGeX layer at a temperature greater than Tc to form an amorphous, graded SiGe layer; and annealing the structure at a temperature of between about 650° C. to 1100° C. for between about ten seconds and sixty minutes to recrystallize the SiGe layer.
Type:
Grant
Filed:
July 11, 2002
Date of Patent:
March 9, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Douglas J. Tweet, Sheng Teng Hsu, Jer-shen Maa, Jong-Jan Lee
Abstract: A ferroelectric memory transistor includes a substrate having active regions therein; a gate stack, including: a high-k insulator element, including a high-k cup and a high-k cap; a ferroelectric element, wherein said ferroelectric element is encapsulated within said high-k insulator element; and a top electrode located on a top portion of said high-k insulator; a passivation oxide layer located over the substrate and gate stack; and metalizations to form contacts to the active regions and the gate stack.
Type:
Grant
Filed:
March 10, 2003
Date of Patent:
March 9, 2004
Assignee:
Sharp Laboratories of America, Inc.
Inventors:
Sheng Teng Hsu, Fengyan Zhang, Tingkai Li