Shape Defined By A Solid Member Other Than Seed Or Product (e.g., Edge-defined Film-fed Growth, Stepanov Method) Patents (Class 117/23)
-
Patent number: 10460955Abstract: An improved methodology for annealing group III-nitride semiconductor device structures using novel weighted cover systems that protect an annealing cap during the semiconductor annealing process is disclosed. The weighted cover system is configured for preventing the escape of nitrogen from the capped semiconductor during annealing. In one particular embodiment, the weighted cover system comprises a protective cover configured to be placed on the capped semiconductor during the anneal, and one or more weights configured to be placed on the protective cover to provide sufficient downward force to the protective cover that is placed on the capped semiconductor.Type: GrantFiled: August 24, 2015Date of Patent: October 29, 2019Assignee: The United States of America as represented by the Secretary of the ArmyInventor: Michael A. Derenge
-
Patent number: 9926645Abstract: Various single crystals are disclosed including sapphire. The single crystals have desirable geometric properties, including a width not less than about 15 cm and the thickness is not less than about 0.5 cm. The single crystal may also have other features, such as a maximum thickness variation, and as-formed crystals may have a generally symmetrical neck portion, particularly related to the transition from the neck to the main body of the crystal. Methods and for forming such crystals and an apparatus for carrying out the methods are disclosed as well.Type: GrantFiled: April 17, 2017Date of Patent: March 27, 2018Assignee: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: John Walter Locher, Steven Anthony Zanella, Ralph Lampson MacLean, Jr., Herbert Ellsworth Bates
-
Flowable Chips and Methods for the Preparation and Use of Same, and Apparatus for Use in the Methods
Publication number: 20150090178Abstract: A method for recharging a crucible with polycrystalline silicon comprises adding flowable chips to a crucible used in a Czochralski-type process. Flowable chips are polycrystalline silicon particles made from polycrystalline silicon prepared by a chemical vapor deposition process, and flowable chips have a controlled particle size distribution, generally nonspherical morphology, low levels of bulk impurities, and low levels of surface impurities. Flowable chips can be added to the crucible using conventional feeder equipment, such as vibration feeder systems and canister feeder systems.Type: ApplicationFiled: December 3, 2014Publication date: April 2, 2015Inventors: ARVID NEIL ARVIDSON, TERENCE LEE HORSTMAN, MICHAEL JOHN MOLNAR, CHRIS Tim SCHMIDT, ROGER DALE SPENCER, Jr. -
Patent number: 8968471Abstract: The present disclosure provides an apparatus for manufacturing a silicon substrate for solar cells using continuous casting, which can improve quality, productivity and energy conversion efficiency of the silicon substrate. The apparatus includes a crucible unit configured to receive raw silicon and having a discharge port, a heating unit provided to an outer wall and an external bottom surface of the crucible unit and heating the crucible unit to form molten silicon, a casting unit casting the molten silicon into a silicon substrate, a cooling unit rapidly cooling the silicon substrate, and a transfer unit disposed at one end of the cooling unit and transferring the silicon substrate. The casting unit includes a casting unit body having a casting space defined therein to be horizontally connected to the discharge port, and an assistant heating mechanism that preheats the casting unit body to control a solidification temperature of the silicon substrate.Type: GrantFiled: May 25, 2011Date of Patent: March 3, 2015Assignee: Korea Institute of Energy ResearchInventors: Bo-Yun Jang, Jin-Seok Lee, Joon-Soo Kim
-
Patent number: 8801855Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.Type: GrantFiled: September 24, 2012Date of Patent: August 12, 2014Assignee: Silicor Materials Inc.Inventor: Scott Nichol
-
Patent number: 8790460Abstract: Techniques are generally disclosed for forming crystalline bodies. An example system, device or method for forming crystalline bodies may include a crucible for containing molten crystalline material and a support for accommodating a seed on an end thereof, the support being movable along a translation axis in a pull direction to draw the seed crystal from the molten crystalline, thereby initiating growth of a crystalline body along a growth path. Further examples may include one or more nozzles configured to be coupled to a fluid source, the nozzles being positioned relative to the growth path for shaping the crystal body as the molten crystalline is pulled in the pull direction along the growth path.Type: GrantFiled: May 18, 2009Date of Patent: July 29, 2014Assignee: Empire Technology Development LLCInventor: Christopher A Bang
-
Patent number: 8764901Abstract: Embodiments related to sheet production are disclosed. A melt of a material is cooled to form a sheet of the material on the melt. The sheet is formed in a first region at a first sheet height. The sheet is translated to a second region such that it has a second sheet height higher than the first sheet height. The sheet is then separated from the melt. A seed wafer may be used to form the sheet.Type: GrantFiled: March 3, 2011Date of Patent: July 1, 2014Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Peter L. Kellerman, Dawei Sun, Brian Helenbrook, David S. Harvey
-
Patent number: 8685164Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.Type: GrantFiled: September 24, 2012Date of Patent: April 1, 2014Assignee: Silicor Materials Inc.Inventor: Scott Nichol
-
Patent number: 8685161Abstract: Various single crystals are disclosed including sapphire. The single crystals have desirable geometric properties, including a width not less than about 15 cm and the thickness is not less than about 0.5 cm. The single crystal may also have other features, such as a maximum thickness variation, and as-formed crystals may have a generally symmetrical neck portion, particularly related to the transition from the neck to the main body of the crystal. Methods and for forming such crystals and an apparatus for carrying out the methods are disclosed as well.Type: GrantFiled: February 14, 2012Date of Patent: April 1, 2014Assignee: Saint-Gobain Ceramics & Plastics, Inc.Inventors: John W. Locher, Steven A. Zanella, Ralph L. MacLean, Jr., Herbert Ellsworth Bates
-
Patent number: 8685162Abstract: In one embodiment, a sheet production apparatus comprises a vessel configured to hold a melt of a material. A cooling plate is disposed proximate the melt and is configured to form a sheet of the material on the melt. A first gas jet is configured to direct a gas toward an edge of the vessel. A sheet of a material is translated horizontally on a surface of the melt and the sheet is removed from the melt. The first gas jet may be directed at the meniscus and may stabilize this meniscus or increase local pressure within the meniscus.Type: GrantFiled: March 1, 2011Date of Patent: April 1, 2014Assignee: Varian Semiconductor Equipment Associates, Inc.Inventors: Peter L. Kellerman, Gregory D. Thronson, Dawei Sun
-
Publication number: 20140060420Abstract: The present invention relates to a crystal fiber, and more particularly to a Ti: sapphire crystal fiber, a manufacturing method thereof, and a wide band light source with the same. The Ti: sapphire single crystal is grown by means of laser-heated pedestal growth (LHPG) method into a crystal fiber of a predetermined diameter. The as-grown crystal fiber is annealed for enhancing its fluorescence and reducing the infra-red residual absorption. The annealed crystal fiber is inserted into a glass capillary and is grown into a single-clad crystal fiber. The wide band light source comprises: a pumping source for providing a pumping light; a single-clad Ti: sapphire crystal fiber for absorbing the pumping light and emitting the wide band light.Type: ApplicationFiled: November 6, 2013Publication date: March 6, 2014Applicant: NATIONAL TAIWAN UNIVERSITYInventors: KUANG-YU HSU, DONG-YO JHENG, YI-HAN LIAO, SHENG-LUNG HUANG
-
Patent number: 8647432Abstract: A method for making a large surface area silicon filament for production of bulk polysilicon by chemical vapor deposition (CVD) includes melting silicon and growing the filament from the melted silicon by an EFG method using a shaping die. The cross sectional shape of the silicon filament is constant over its axial length to within a tolerance of 10%. In embodiments, a plurality of identical and/or dissimilar filaments are grown simultaneously using a plurality of shaping dies. The filaments can be tubular. Filament cross sections can be annular and/or can include outwardly extending fins, with wall and/or fin thicknesses constant to within 10%. Filaments can be doped with at least one element from groups 3 and 5 of the Periodic Table. The filament can have a length equal to a length of a specified slim rod filament, and a total impedance not greater than the slim rod impedance.Type: GrantFiled: July 20, 2011Date of Patent: February 11, 2014Assignee: GTAT CorporationInventors: Yuepeng Wan, Santhana Raghavan Parthasarathy, Carl Chartier, Adrian Servini, Chandra P Khattak
-
Patent number: 8580036Abstract: The method and apparatus includes a vessel having a bottom and sidewalls arranged to house the material in a molten state. A temperature controlled horizontally oriented, cooling plate is movable into and out of the top of the molten material. When the cooling plate is lowered into the top of the melt, an ingot of solid silicon is solidified downwards.Type: GrantFiled: May 10, 2006Date of Patent: November 12, 2013Assignee: Elkem Solar ASInventor: Kenneth Friestad
-
Patent number: 8500905Abstract: Disclosed is a sapphire single crystal growing apparatus using the Kyropoulos method, and more particularly, is a Kyropoulos sapphire single crystal growing apparatus using an elliptic crucible, which can increase the recovery rate by the elliptic crucible and anisotropic heating.Type: GrantFiled: January 5, 2012Date of Patent: August 6, 2013Assignee: DK Aztec Co., Ltd.Inventor: Jong Kwan Park
-
Patent number: 8480803Abstract: A method of making an article of a semiconducting material involves withdrawing from a melt of molten semiconducting material a solid mold having already formed on an external surface of the mold a solid layer of the semiconducting material. During the act of withdrawal, one or more of a temperature, a force, and a relative rate of withdrawal are controlled in order to achieve one or more desired attributes in a solid overlayer of semiconductor material that is formed over the solid layer during the withdrawal.Type: GrantFiled: October 30, 2009Date of Patent: July 9, 2013Assignee: Corning IncorporatedInventors: Glen Bennett Cook, Prantik Mazumder, Balram Suman, Christopher Scott Thomas
-
Publication number: 20130171052Abstract: The invention describes a process for removing nonmetallic impurities from metallurgical silicon. A melt is produced from metallurgical silicon and halide-containing silicon. As a result, the impurities are sublimed out and removed from the melt in the form of nonmetal halides. Compared with the known process, in which gaseous halogen is blown through an Si melt, the novel process can be carried out in a particularly simple and efficient manner.Type: ApplicationFiled: July 29, 2009Publication date: July 4, 2013Inventors: Seyed-Javad Mohsseni-Ala, Christian Bauch, Rumen Deltschew, Thoralf Gebel, Gerd Lippold, Matthias Heuer, Fritz Kirscht, Kamel Ounadjela
-
Patent number: 8388751Abstract: A method of growing a ribbon crystal provides a crucible containing molten material and passes string through the molten material to grow the ribbon crystal. The method further directs gas flow around the ribbon crystal such that the gas flows down along the ribbon crystal toward the crucible.Type: GrantFiled: August 17, 2009Date of Patent: March 5, 2013Assignee: Max Era, Inc.Inventors: David Harvey, Weidong Huang, Scott Reitsma, Minh Sy Le
-
Patent number: 8313720Abstract: In the growth of a SiC boule, a growth guide is provided inside of a growth crucible that is charged with SiC source material at a bottom of the crucible and a SiC seed crystal at a top of the crucible. The growth guide has an inner layer that defines at least part of an opening in the growth guide and an outer layer that supports the inner layer in the crucible. The opening faces the source material with the seed crystal positioned at an end of the opening opposite the source material. The inner layer is formed from a first material having a higher thermal conductivity than the second, different material forming the outer layer. The source material is sublimation grown on the seed crystal in the growth crucible via the opening in the growth guide to thereby form the SiC boule on the seed crystal.Type: GrantFiled: January 15, 2008Date of Patent: November 20, 2012Assignee: II-VI IncorporatedInventors: Ilya Zwieback, Avinash K. Gupta, Edward Semenas, Thomas E. Anderson
-
Patent number: 8293007Abstract: A ribbon crystal pulling furnace has a base insulation and a liner insulation removably connected to the base insulation. At least a portion of the liner insulation forms an interior for containing a crucible.Type: GrantFiled: June 13, 2008Date of Patent: October 23, 2012Assignee: Max Era, Inc.Inventors: Richard Wallace, David Harvey, Weidong Huang, Scott Reitsma, Christine Richardson
-
Patent number: 8273176Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.Type: GrantFiled: June 13, 2011Date of Patent: September 25, 2012Assignee: Calisolar, Inc.Inventor: Scott Nichol
-
Patent number: 8241424Abstract: An upper side heater 10 is configured so that a current passage width becomes larger at a heater lower part than at a heater upper part. Thus, the upper side heater 10 has a current-carrying cross-sectional area which becomes larger at the heater lower part than at the heater upper part, a resistance value becomes accordingly smaller at the heater lower part than at the heater upper part, and a heat generation amount becomes relatively smaller at the heater lower part than at the heater upper part. Meanwhile, a lower side heater 20 is configured so that the current passage width becomes larger at the heater upper part than at the heater lower part. Thus, the current-carrying cross-sectional area of the lower side heater 20 becomes larger at the heater upper part than at the heater lower part, a resistance value becomes accordingly smaller at the heater upper part than at the heater lower part, and a heat generation amount becomes relatively smaller at the heater upper part than at the heater lower part.Type: GrantFiled: September 25, 2006Date of Patent: August 14, 2012Assignee: Sumco Techxiv Kabushiki KaishaInventors: Tetsuhiro Iida, Yutaka Shiraishi, Junsuke Tomioka
-
Patent number: 8157913Abstract: Various single crystals are disclosed including sapphire. The single crystals have desirable geometric properties, including a width not less than about 15 cm and the thickness is not less than about 0.5 cm. The single crystal may also have other features, such as a maximum thickness variation, and as-formed crystals may have a generally symmetrical neck portion, particularly related to the transition from the neck to the main body of the crystal. Methods and for forming such crystals and an apparatus for carrying out the methods are disclosed as well.Type: GrantFiled: January 29, 2008Date of Patent: April 17, 2012Assignee: Saint-Gobain Ceramics & Plastics, Inc.Inventors: John W. Locher, Steven A. Zanella, Ralph L. MacLean, Jr., Herbert Ellsworth Bates
-
Publication number: 20120060748Abstract: A Czochralski (“CZ”) single-crystal growth process system continuously grows crystal boules in a chamber furnace during a single thermal cycle. Finished boules are transferred from the furnace chamber, without need to cool the furnace, to an adjoining cooling chamber for controlled cooling. Controlled cooling is preferably accomplished by transporting boules along a path having an incrementally decreasing temperature. In order to maximize crystal boule yield in a single furnace thermal cycle, the crucible assembly may be recharged with crystal growth aggregate and/or slag may be discharged during the crystal boule growth process without opening the furnace.Type: ApplicationFiled: September 9, 2010Publication date: March 15, 2012Applicant: SIEMENS MEDICAL SOLUTIONS USA, INC.Inventors: James L. Corbeil, Troy Marlar, Piotr Szupryczynski
-
Patent number: 8092594Abstract: The present invention relates to a carbon ribbon for covering in a thin layer of semiconductor material, and to a method of deposited such a layer on a substrate constituted by a carbon ribbon. At least one of the two faces of the carbon ribbon is for covering in a layer of semiconductor material by causing the ribbon to pass substantially vertically upwards through a bath of molten semiconductor material. According to the invention, the two edges of at least one of the two faces of the carbon ribbon project so as to form respective rims.Type: GrantFiled: June 7, 2006Date of Patent: January 10, 2012Assignee: SOLARFORCEInventor: Christian Belouet
-
Flowable Chips and Methods for the Preparation and Use of Same, and Apparatus for Use in the Methods
Publication number: 20110286906Abstract: A method for recharging a crucible with polycrystalline silicon comprises adding flowable chips to a crucible used in a Czochralski-type process. Flowable chips are polycrystalline silicon particles made from polycrystalline silicon prepared by a chemical vapor deposition process, and flowable chips have a controlled particle size distribution, generally nonspherical morphology, low levels of bulk impurities, and low levels of surface impurities. Flowable chips can be added to the crucible using conventional feeder equipment, such as vibration feeder systems and canister feeder systems.Type: ApplicationFiled: August 3, 2011Publication date: November 24, 2011Inventors: Arvid Neil Arvidson, Terence Lee Horstman, Michael John Molnar, Chris Tim Schmidt, Roger Dale Spencer, JR. -
Flowable chips and methods for the preparation and use of same, and apparatus for use in the methods
Patent number: 8021483Abstract: A method for recharging a crucible with polycrystalline silicon comprises adding flowable chips to a crucible used in a Czochralski-type process. Flowable chips are polycrystalline silicon particles made from polycrystalline silicon prepared by a chemical vapor deposition process, and flowable chips have a controlled particle size distribution, generally nonspherical morphology, low levels of bulk impurities, and low levels of surface impurities. Flowable chips can be added to the crucible using conventional feeder equipment, such as vibration feeder systems and canister feeder systems.Type: GrantFiled: November 14, 2002Date of Patent: September 20, 2011Assignee: Hemlock Semiconductor CorporationInventors: Arvid Neil Arvidson, Terence Lee Horstman, Michael John Molnar, Chris Tim Schmidt, Roger Dale Spencer, Jr. -
Patent number: 7959730Abstract: Embodiments of the present invention relate to a process for obtaining silicon crystals from silicon. The method includes contacting silicon powder with a solvent metal to provide a mixture containing silicon, melting the silicon under submersion to provide a first molten liquid, contacting the first molten liquid with a first gas to provide dross and a second molten liquid, separating the dross and the second molten liquid, cooling the second molten liquid to form first silicon crystals and a first mother liquid and separating the first silicon crystals and the first mother liquid.Type: GrantFiled: October 3, 2008Date of Patent: June 14, 2011Assignee: 6N Silicon Inc.Inventor: Scott Nichol
-
Publication number: 20100288186Abstract: Techniques are generally disclosed for forming crystalline bodies. An example system, device or method for forming crystalline bodies may include a crucible for containing molten crystalline material and a support for accommodating a seed on an end thereof, the support being movable along a translation axis in a pull direction to draw the seed crystal from the molten crystalline, thereby initiating growth of a crystalline body along a growth path. Further examples may include one or more nozzles configured to be coupled to a fluid source, the nozzles being positioned relative to the growth path for shaping the crystal body as the molten crystalline is pulled in the pull direction along the growth path.Type: ApplicationFiled: May 18, 2009Publication date: November 18, 2010Inventor: Christopher A. Bang
-
Publication number: 20100282160Abstract: Various single crystals are disclosed including sapphire. The single crystals have desirable geometric properties, including a width not less than about 15 cm and the thickness is not less than about 0.5 cm. The single crystal may also have other features, such as a maximum thickness variation, and as-formed crystals may have a generally symmetrical neck portion, particularly related to the transition from the neck to the main body of the crystal. Methods and for forming such crystals and an apparatus for carrying out the methods are disclosed as well.Type: ApplicationFiled: January 29, 2008Publication date: November 11, 2010Applicant: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: John Walter Locher, Steven Anthony Zanella, Ralph Lampson MacLean, JR., Herbert Ellsworth Bates
-
Patent number: 7799131Abstract: The present invention provides a method for the continuous production of semiconductor ribbons by growth from a linear molten zone. The creation of the molten zone is achieved by application of an electric current, direct or alternating, parallel to the surface of the ribbon and perpendicular to the direction of growth, and intense enough to melt the said material, preferably using electrodes of the said material. The molten zone is fed by transference of the material, in the liquid state, from one or more reservoirs, where melting of the feedstock occurs. Preferably, the said electrodes and the said reservoir(s) are only constituted by the said material, thus avoiding contamination by foreign materials. The present invention is applicable, for example, in the industry of silicon ribbons production for photovoltaic application.Type: GrantFiled: April 15, 2004Date of Patent: September 21, 2010Assignee: Faculdade de Ciencias Da Universidade de LisboaInventors: António Vallêra, João Serra, Jorge Maia Alves, Miguel Brito, Roberto Gamboa, João Henriques
-
Publication number: 20100147209Abstract: A rod having a length of 0.5 m to 4 m and having a diameter of 25 mm to 220 mm, comprising a high-purity alloy composed of 0.1 to 50 mol % germanium and 99.9 to 50 mol % silicon, the alloy having been deposited on a thin silicon rod or on a thin germanium-alloyed silicon rod, the deposited alloy having a polycrystalline structure.Type: ApplicationFiled: December 3, 2009Publication date: June 17, 2010Applicant: WACKER CHEMIE AGInventors: Laszlo Fabry, Mikhail Sofin
-
Patent number: 7682452Abstract: A method and apparatus for eliminating voids and improving crystal quality in shaped ceramic product, e.g. sapphire fiber or silicon sheet, from a melt by using a sloped die tip. The sloped die tip or array thereof comprises an outer sidewall which is sloped outwardly at an angle of 5° to 40° from the vertical.Type: GrantFiled: April 9, 2007Date of Patent: March 23, 2010Assignee: Sapphire Systems Inc.Inventor: John O. Outwater
-
Publication number: 20100058977Abstract: A single crystal seed for use in casting a single crystal article, consisting essentially of, in weight %, about 5.0% to about 40.0% Mo, up to 0.1% C and balance essentially Ni.Type: ApplicationFiled: July 20, 2009Publication date: March 11, 2010Inventors: Steven T. Schaadt, Brad J. Murphy, Lisa K. Koivisto
-
Patent number: 7442251Abstract: This method for producing silicon single crystals includes: growing a silicon single crystal by the Czochralski method while cooling at least part of the silicon single crystal under growth with a cooling member which circumferentially surrounds the silicon single crystal and has an inner contour that is coaxial with a pull axis, wherein an ambient gas in which the silicon single crystal is grown includes a hydrogen-atom-containing substance in gaseous form. This silicon single crystal is produced by the above method.Type: GrantFiled: April 19, 2006Date of Patent: October 28, 2008Assignee: Sumco CorporationInventors: Shuichi Inami, Hiroki Murakami, Nobumitsu Takase, Ken Hamada, Tsuyoshi Nakamura
-
Publication number: 20080245292Abstract: A method and apparatus for eliminating voids and improving crystal quality in shaped ceramic product, e.g. sapphire fiber or silicon sheet, from a melt by using a sloped die tip. The sloped die tip or array thereof comprises an outer sidewall which is sloped outwardly at an angle of 5° to 40° from the vertical.Type: ApplicationFiled: April 9, 2007Publication date: October 9, 2008Inventor: John O. Outwater
-
Patent number: 7413606Abstract: It is aimed at providing a fluoride crystal growing method capable of controlling a shape of the crystal by a micro-pulling-down method. Fluoride crystals in shapes depending on purposes, respectively, can be grown by adopting carbon, platinum, and iridium as crucible materials adaptable to fluorides, respectively, and by designing shapes of the crucibles taking account of wettabilities of the materials with the fluorides, respectively.Type: GrantFiled: July 20, 2004Date of Patent: August 19, 2008Assignees: Stella Chemifa Corporation, Fukuda Crystal LaboratoryInventors: Tomohiko Satonaga, Hirohisa Kikuyama, Tsuguo Fukuda
-
Patent number: 7407550Abstract: A method and apparatus for growing a crystalline or poly-crystalline body from a melt is described, wherein the melt is retained by capillary attachment to edge features of a mesa crucible. The boundary profile of the resulting melt surface results in an effect which induces a ribbon grown from the surface of the melt to grow as a flat body. Further, the size of the melt pool is substantially reduced by bringing these edges close to the ribbon, thereby reducing the materials cost and electric power cost associated with the process.Type: GrantFiled: October 17, 2003Date of Patent: August 5, 2008Assignee: Evergreen Solar, Inc.Inventor: Emanuel Michael Sachs
-
Publication number: 20080138927Abstract: Systems and methods that utilize semiconductor molecules to form crystalline thin-films by depositing the molecules into a substrate at a lateral growth front. Techniques embodied in corresponding ones of the disclosed systems and methods include a submersion technique in which a substrate is submerged in a precursor solution containing the molecules and a film is grown at a meniscus formed between the free surface of the solution and the substrate. Another disclosed technique is a mask technique in which a film is grown on a substrate through an aperture of a moving mask be exposing the aperture to the molecules. Yet another technique disclosed is a writing technique in which a pen is used to deliver to a substrate a precursor solution containing the molecules and the film is grown as the solvent evaporates from the delivered solution.Type: ApplicationFiled: January 2, 2008Publication date: June 12, 2008Applicant: The University of Vermont and State Agricultural CollegeInventor: Randall L. Headrick
-
Patent number: 7344594Abstract: A method of charging a crystal forming apparatus with molten source material is provided. The method includes the steps of positioning a melter assembly relative to the crystal forming apparatus for delivering molten silicon to a crucible of the apparatus. An upper heating coil in the melter assembly is operated to melt source material in a melting crucible. A lower heating coil in the melter assembly is operated to allow molten source material to flow through an orifice of the melter assembly to deliver a stream of molten source material to the crucible of the crystal forming apparatus. The invention is also directed to a method of charging a crystal puller with molten silicon including the step of removing an upper housing of the crystal puller defining a pulling chamber from a lower housing of the crystal puller defining a growth chamber and attaching the lower housing in place of the upper housing.Type: GrantFiled: June 17, 2005Date of Patent: March 18, 2008Assignee: MEMC Electronic Materials, Inc.Inventor: John Davis Holder
-
Publication number: 20080053369Abstract: Disclosed is a method of manufacturing colloidal crystals using a confined convective assembly, more particularly, to a method for manufacturing two-dimensional and/or three dimensional colloidal crystals on a substrate by infusing colloidal suspension between two substrates and self-assembling colloidal particles by capillary action. The present invention can control a convective flow moving the colloidal particles to a meniscus generated by removing the solvent of the colloidal suspension. It is possible to manufacture face-to-face two-dimensional colloidal crystals and/or three-dimensional colloidal crystals within a short time using various sizes of colloidal particles through the control of the convective flow of colloidal particles, which are not easily achieved in the existing method.Type: ApplicationFiled: August 30, 2006Publication date: March 6, 2008Applicant: Korean Advanced Institute of Science and TechnologyInventors: O-Ok Park, Mun-Ho Kim, Sang-Hyuk Im
-
Patent number: 7135069Abstract: An inexpensive method of coating silicon shot with boron atoms comprises (1) immersing silicon shot in an aqueous solution comprising a boric acid and polyvinyl alcohol, and (2) heating the solution so as to evaporate water and form a polymerized polyvinyl alcohol coating containing boron on the shot. A precise amount of this coated shot may then be mixed with a measured quantity of intrinsic silicon pellets and the resulting mixture may then be melted to provide a boron-doped silicon melt for use in growing p-type silicon bodies that can be converted to substrates for photovoltaic solar cells.Type: GrantFiled: March 4, 2004Date of Patent: November 14, 2006Assignee: Schott Solar, Inc.Inventor: Bernhard P. Piwczyk
-
Patent number: 7022180Abstract: Methods and apparatus for concurrent growth of multiple crystalline ribbons from a single crucible employ meniscus shapers to facilitate continuous growth of discrete and substantially flat crystalline ribbons having controlled width.Type: GrantFiled: September 16, 2004Date of Patent: April 4, 2006Assignee: Evergreen Solar, Inc.Inventor: Richard Lee Wallace, Jr.
-
Patent number: 6958092Abstract: A wafer is characterized in that the wafer has a non-uniform distribution of crystal lattice vacancies, wherein the concentration of crystal lattice vacancies in the bulk layer are greater than the concentration of crystal lattice vacancies in the front surface layer. In addition, the front surface of the wafer has an epitaxial layer, having a thickness of less than about 2.0 çm, deposited thereon. A process comprises heating a surface of a wafer starting material to remove a silicon oxide layer from the surface and depositing an epitaxial layer onto the surface to form an epitaxial wafer. The epitaxial wafer is then heated to a soak temperature of at least about 1175C. while exposing the epitaxial layer to an oxidizing atmosphere comprising an oxidant, and the wafer is cooled at a rate of at least about 10C./sec.Type: GrantFiled: March 25, 2003Date of Patent: October 25, 2005Assignee: MEMC Electronic Materials, Inc.Inventors: Gregory M. Wilson, Jon A. Rossi, Charles C. Yang
-
Patent number: 6869477Abstract: A process for preparing a single crystal silicon in accordance with the Czochralski method, is provided. More specifically, by quickly reducing the pull rate at least once during the growth of the neck portion of the single crystal ingot, in order to change the melt/solid interface shape from a concave to a convex shape, the present process enables zero dislocation growth to be achieved in a large diameter neck within a comparably short neck length, such that large diameter ingots of substantial weight can be produced safely and at a high throughput.Type: GrantFiled: February 20, 2001Date of Patent: March 22, 2005Assignee: MEMC Electronic Materials, Inc.Inventors: Hiroyo Haga, Makoto Kojima, Shigemi Saga
-
Patent number: 6814802Abstract: Methods and apparatus for concurrent growth of multiple crystalline ribbons from a single crucible employ meniscus shapers to facilitate continuous growth of discrete and substantially flat crystalline ribbons having controlled width.Type: GrantFiled: October 30, 2002Date of Patent: November 9, 2004Assignee: Evergreen Solar, Inc.Inventor: Richard Lee Wallace, Jr.
-
Patent number: 6811607Abstract: The present invention provides aluminum oxide crystalline materials including dopants and oxygen vacancy defects and methods of making such crystalline materials. The crystalline materials of the present invention have particular utility in optical data storage applications.Type: GrantFiled: December 4, 2002Date of Patent: November 2, 2004Assignee: Landauer, Inc.Inventor: Mark Akselrod
-
Patent number: 6740158Abstract: An inexpensive method of coating silicon shot with boron atoms comprises (1) immersing silicon shot in a boron dopant spin-on solution comprising a borosilicate, a polymer precursor, and a volatile solvent, and (2) removing the solvent so as to leave a polymeric coating containing borosilicate on the shot. A precise amount of this coated shot may then be mixed with a measured quantity of silicon pellets and the resulting mixture may then be melted to provide a boron-doped silicon melt for use in growing p-type silicon bodies that can be converted to substrates for photovoltaic solar cells.Type: GrantFiled: May 9, 2002Date of Patent: May 25, 2004Assignee: RWE Schott Solar Inc.Inventor: Bernhard P. Piwczyk
-
Patent number: 6673148Abstract: An apparatus and method is provided for manufacturing a semiconductor substrate such as web crystals. The apparatus includes a chamber and a growth hardware assembly housed within the chamber. A magnetic field system produces a vertical magnetic field within the chamber.Type: GrantFiled: September 5, 2002Date of Patent: January 6, 2004Assignee: Ebara Solar, Inc.Inventors: Hilton F. Glavish, Hideyuki Isozaki, Keiji Maishigi, Kentaro Fujita
-
Patent number: 6669776Abstract: An apparatus and method is provided for manufacturing a semiconductor substrate such as web crystals. The apparatus includes a chamber and a growth hardware assembly housed within the chamber. A magnetic field system produces a vertical magnetic field within the chamber.Type: GrantFiled: August 2, 2002Date of Patent: December 30, 2003Assignee: Ebara Solar, Inc.Inventors: Hilton F. Glavish, Hideyuki Isozaki, Keiji Maishigi, Kentaro Fujita
-
Patent number: 6663710Abstract: An apparatus and a method that permits a seed crystal to be directed to a precise location of a melt for growing a ribbon-shaped crystal, but after the crystal has commenced growing, the ribbon-shaped crystal is continuously pulled up so as to produce a longitudinally extending crystal using a continuous pulling device. The method for producing a ribbon-shaped crystal includes growing a ribbon-shaped crystal on a seed crystal using a linear pulling device for pulling the seed crystal and a crystal growing at the end of the seed crystal in a vertical direction, and continuing to pull the ribbon-shaped crystal by using a continuous pulling device having a continuous pulling mechanism.Type: GrantFiled: October 29, 2001Date of Patent: December 16, 2003Assignee: Ebara CorporationInventors: Kentaro Fujita, Kenji Terao, Hideyuki Isozaki, Iwao Satoh