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| Number | Title | Issue Date |
| 8158093 | Fluidized bed reactor for production of high purity silicon Methods and apparatus for the production of high purity silicon including a fluidized bed reactor with one or more protective layers deposited on an inside surface of the fluidized bed reactor. The protective layer may be resistant to corrosion by fluidizing gases a... | 04/17/2012 |
| 8034313 | Recovery method of silicon slurry In slicing a crystal bar into silicon wafers, an average about 40% of silicon would be loss due to the widths of slicing wires themselves. The fact that the silicon slurry is discarded as sludge or discarded after recovering silicon carbide particles causes a large ... | 10/11/2011 |
| 8029756 | Closed-loop silicon production A closed loop bromosilane process is provided to provide semiconductor grade silicon through the thermal decomposition of tribromosilane. The resulting silicon tetrabromide byproduct from this thermal decomposition is recycled in a silicon tetrabromide converter to ... | 10/04/2011 |
| 7935327 | Silicon production with a fluidized bed reactor integrated into a siemens-type process A fluidized bed reactor and a Siemens reactor are used to produce polycrystalline silicon. The process includes feeding the vent gas from the Siemens reactor as a feed gas to the fluidized bed reactor. ... | 05/03/2011 |
| 7922990 | Method and device for producing granulated polycrystalline silicon in a fluidized bed reactor A fluidized bed process for the production of polycrystalline silicon granules supplies, in addition to reaction gas, a gas containing 99.5 to 95 mol. percent hydrogen and 0.5 to 5 mol. percent gaseous silicon compounds, and the reactor wall is maintained at the sam... | 04/12/2011 |
| 7871590 | Mass of silicon solidified from molten state and process for producing the same A solidified mass for a high-purity multicrystal silicon material that is preferably applicable to producing crystal type silicon ingots for photo voltaics, and a process for producing the solidified mass are provided. The mass of silicon solidified from molten stat... | 01/18/2011 |
| 7858063 | High purity metallurgical silicon and method for preparing same The invention concerns a silicon designed in particular for making solar cells containing a total of impurities ranging between 100 and 400 ppm, a boron content ranging between 0.5 and 3 ppm, a phosphorus/boron content ratio ranging between 1 and 3, and a content of... | 12/28/2010 |
| 7842270 | Ribbon crystal having reduced wetting string A string for use in a string ribbon crystal has a base portion with a refractory material, and an externally exposed layer radially outward of the refractory material. The base portion has a coefficient of thermal expansion that is generally matched with the coeffic... | 11/30/2010 |
| 7820126 | Method and apparatus for improving the efficiency of purification and deposition of polycrystalline silicon Methods and apparatus for the commercial-scale production of purified polycrystalline silicon granules with one or more tailored levels of n- and p-type impurities from an impure silicon source such as, for example, metallurgical-grade silicon. Purification systems ... | 10/26/2010 |
| 7754175 | Silicon and catalyst material preparation in a process for producing trichlorosilane A process for preparing trichlorosilane by reacting silicon with hydrogen chloride, or silicon tetrachloride with hydrogen in the presence of silicon, and catalysts where the silicon and catalysts are laminated together and reduced in particle size prior to reaction... | 07/13/2010 |
| 7727502 | Process for the production of medium and high purity silicon from metallurgical grade silicon A process for purifying low-purity metallurgical grade silicon, contains at least one contaminant and obtains a higher-purity solid polycrystalline silicon. The process includes containing a melt of low-purity metallurgical grade silicon in a mold having insulated b... | 06/01/2010 |
| 7708970 | Process for depositing polycrystalline silicon Polycrystalline silicon is prepared by thermally decomposing a reaction gas comprising hydrogen and a silicon-containing gas in a reaction chamber containing heated silicon, depositing additional silicon thereon, and forming an offgas; and separating the offg... | 05/04/2010 |
| 7691357 | Method for producing polycrystalline silicon A by-product mixture produced when polycrystalline silicon is deposited on a base material in a CVD reactor is made to react with chlorine to form a tetrachlorosilane (STC) effluent in a chlorination reaction vessel, and the tetrachlorosilane (STC) distillate is mad... | 04/06/2010 |
| 7662355 | Silicon nanosized linear body and a method for producing a silicon nanosized linear body Silicon nanosized linear bodies with different structures and properties can be produced by appropriately setting the condition for the pretreatment by a radical (reaction condition of a hydrogen radical, e.g. concentration). A silicon nanosized linear body is produ... | 02/16/2010 |
| 7662356 | Method of refining Si The present invention provides a method of refining low purity Si by a slag, in particular removing B, which suppresses wear of the reaction vessel due to the slag and produces high purity Si used for solar battery materials etc. at a low cost, comprising adding SiO... | 02/16/2010 |
| 7658899 | Production method of nanoparticle A production method of nano-sized silicon crystal particles comprising the step of allowing monosilane to be oxidized in a bulk liquid phase to form the nano-sized silicon crystal particles within the bulk liquid phase, wherein a liquid of the bulk liquid phase is a... | 02/09/2010 |
| 7632478 | Process for producing silicon The present invention relates to a process for producing silicon by thermal decomposition of a gaseous mixture comprising monosilane, monochlorosilane and, if desired, further chlorosilanes, e.g. dichlorosilane. ... | 12/15/2009 |
| 7615202 | Method for producing high purity silicon An object of the invention is to provide a method for producing a large amount of inexpensive high purity silicon useful for a solar battery. Disclosed is a method for producing high purity silicon by migrating impurities in silicon to slag including performing a fi... | 11/10/2009 |
| 7553467 | Tubular reaction vessel and process for producing silicon therewith There is provided a reaction vessel whereby silicon produced can be smoothly recovered dropwise without excessive thermal load on constitutional parts of the reaction vessel, a silicon deposition feedstock gas can be reacted efficiently even when the reaction vessel... | 06/30/2009 |
| 7553466 | Method for producing highly pure, granular silicon in a fluidised bed The present invention relates to a method for producing highly pure, granular silicon with a narrow particle-size distribution by decomposing silanes or halosilanes in a fluidised bed and epitaxially growing silicon on silicon seed particles, which method is charact... | 06/30/2009 |
| 7429369 | Silicon nanoparticle nanotubes and method for making the same A relatively thick electrode is positioned opposite the surface of a substrate/second electrode. The electrode and the substrate surface are both contacted by a solution including silicon nanoparticles. The substrate surface is completely immersed in the solution in... | 09/30/2008 |
| 7404941 | Medium purity metallurgical silicon and method for preparing same The invention concerns a method for producing a medium purity silicon comprising: preparing, by carbothermic reduction of silica in a submerged arc-furnace a silicon with low boron content; refining the liquid silicon with oxygen or chlorine; treating the refined si... | 07/29/2008 |
| 7361592 | Method for producing a component comprising at least one germanium-based element and component obtained by such a method The method successively comprises production, on a substrate, of a stack of layers comprising at least one first layer made from germanium and silicon compound initially having a germanium concentration comprised between 10% and 50%. The first layer is arranged betw... | 04/22/2008 |
| 7294324 | Low basal plane dislocation bulk grown SiC wafers A high quality single crystal wafer of SiC is disclosed. The wafer has a diameter of at least about 3 inches (75 mm) and at least one continuous square inch (6.25 cm2) of surface area that has a basal plane dislocation volume density of less than about 50... | 11/13/2007 |
| 7294197 | Formation of a silicon sheet by cold surface casting Metallurgical grade silicon or high purity silicon beads developed from a fluidized bed process are melted in a cooled aluminum crucible, such that a non wetted interface is created between the molten silicon and a cooled supporting substrate that includes a surface... | 11/13/2007 |
| 7288501 | Process and apparatus for the thermal treatment of pulverulent substances Process and apparatus for the thermal treatment of pulverulent substances, in which the pulverulent substance is dispersed in a carrier gas and is passed in a continuous manner through a heated reactor where it is thermally treated and is then quenched by a cooling ... | 10/30/2007 |
| 7273522 | Plane-parallel structures of silicon/silicon oxide The present invention relates to plane-parallel structures of silicon/silicon oxide (silicon/silicon oxide flakes), obtainable by heating plane-parallel structures of SiOy in an oxygen-free atmosphere at a temperature above 400° C., wherein 0.70≦y≦1.... | 09/25/2007 |
| 7241479 | Thermal CVD synthesis of nanostructures The present invention is generally directed to a novel process for the production of nanowires and nanobelts and the novel nanostructures which can be produced according to the disclosed processes. The process can be carried out at ambient pressure and includes loca... | 07/10/2007 |
| 7182812 | Direct synthesis of oxide nanostructures of low-melting metals The bulk synthesis of highly crystalline noncatalytic low melting metals such as β-gallium oxide tubes, nanowires, and nanopaintbrushes is accomplished using molten gallium and microwave plasma containing a mixture of monoatomic oxygen and hydrogen. Gallium oxide n... | 02/27/2007 |
| 7175685 | Dry conversion of high purity ultrafine silicon powder to densified pellet form for silicon melting applications A bulk silicon material for making silicon ingots, consisting of silicon pellets, and a method for making the pellets from an agglomerate-free source of high purity silicon powder by feeding a controlled amount of silicon powder that is free of intentional additives... | 02/13/2007 |
| 7074880 | Polyimide aerogels, carbon aerogels, and metal carbide aerogels and methods of making same A preparation process of polyimide aerogels that composed of aromatic dianhydrides and aromatic diamines or a combined aromatic and aliphatic diamines is described. Also descried is a process to produce carbon aerogels derived from polyimide aerogel composed of a ri... | 07/11/2006 |
| 7060240 | Sol-gel process for the manufacture of nanocomposite photoluminescent materials and materials thus produced It is described a process based on sol-gel chemistry suitable to the production of nanocomposite materials being photoluminescent at ambient temperature, comprising silicon grains of dimension of nanometers embedded in a silica matrix. ... | 06/13/2006 |
| 7056484 | Method for producing trichlorosilane The invention relates to a method for producing trichlorosilane by reacting silicon with hydrogen, silicon tetrachloride and, optionally, hydrogen chloride, whereby the silicon is provided in comminuted form, and the silicon is mixed with a catalyst during comminuti... | 06/06/2006 |
| 7033561 | Process for preparation of polycrystalline silicon A process for preparing polycrystalline silicon comprising the steps of (A) reacting trichlorosilane with hydrogen thereby forming silicon and an effluent mixture comprising tetrachlorosilane and disilane described by formula HnCl6—nSi2 where n is a value of 0 to ... | 04/25/2006 |
| 7001579 | Method for producing highly purified, granular silicium The invention relates to a method for producing granular silicon by thermal decomposition of a gas containing silicon in a fluidized bed, said decomposition occurring in the presence of free-flowing mobile elements. Preferably, said free-flowing mobile elements beco... | 02/21/2006 |
| 6977097 | Particle forming methods A particle forming method includes feeding a first set of precursors to a first energy application zone. Energy is applied to the first set of precursors in the first energy application zone effective to react and form solid particles from the first set of precursor... | 12/20/2005 |
| 6974367 | Chemical mechanical polishing process A chemical mechanical polishing process includes rotating at least one of a semiconductor substrate and polishing pad relative to the other. A chemical mechanical polishing slurry is provided intermediate the substrate and pad. The substrate is polished with the slu... | 12/13/2005 |
| 6953559 | Method for producing highly pure, granular silicon The invention relates to a method for producing highly pure, granular silicon by decomposing a gas containing silicon in a procedure comprising at least two operating states, at least one state comprising the increased formation of nucleus particles from the decompo... | 10/11/2005 |
| 6932954 | Method for producing silicon A silicon production process which improves the production efficiency of trichlorosilane while an industrially advantageous output is ensured and the amount of the by-produced tetrachlorosilane is suppressed. This process does not require a bulky reduction apparatus... | 08/23/2005 |
| 6926876 | Plasma production of polycrystalline silicon The invention is directed to a method of producing polycrystaline silicon metal from a silicon halide plasma source. The silicon halide is split into silicon and halide ions in an inductively coupled plasma and silicon ions are then condensed to form molten silicon ... | 08/09/2005 |
