摘要:
Semiconductor materials such as silicon particles are doped by mixing the semiconductor material with a solution having a dopan and a solvent. The solvent is removed from the wetted surface of the particles of the semiconductor material, thereby yielding particles that are substantially free from the solvent and are uniformly coated with the dopant.
摘要:
Silicon ingots, in particular, with diameters of approximately 75 mm and greater, can be produced by zone pulling with an oxygen content comparable to crucible-pulled material if a flat quartz element is brought into contact with the molten cap during the pulling operation. A quartz ring which is arranged concentrically beneath the induction heating coil and can be lowered from a rest position into its working position on the molten cap is suitable as a flat element. The ingot material obtained in this manner and also the silicon wafers produced therefrom combine the purity advantages of zone-pulled silicon with the beneficial gettering and hardening action of the incorporated oxygen which otherwise distinguishes only crucible-pulled silicon.
摘要:
An apparatus for preparing a semiconductor compound, having one compound with a substantially higher vapor pressure than the other using a closed horizontal tube disposed in a pressure vessel. The two ends of the tube are located in respective heating ovens having their ends facing away from the tube closed. The heating ovens and tube are disposed within a pressure vessel with the heating ovens having an outside diameter which is considerably smaller than the inside diameter of the pressure vessel and with the total length of the heating ovens arranged one behind the other in the axial direction of the tube substantially smaller than the length of the pressure vessel. In addition, a portion of the tube located between the ovens has associated therewith a separate cooling device.
摘要:
A method of producing monocrystalline semiconductor material in web form which provides the steps of providing a web of polycrystalline semiconductor material having a width which is much greater than its thickness, providing a monocrystalline semiconductor material seed having the same relative dimensions as the polycrystalline material source, providing one or more semiconductor material shaping members, contacting the source, the seed and the shaping member and heating the interface therebetween preferentially to produce a molten zone, moving said monocrystalline semiconductor material seed away from said molten zone as monocrystalline semiconductor material is formed thereon.
摘要:
A single-crystal production equipment which includes, at least: a raw material supply apparatus which supplies a granular raw material to a melting apparatus positioned therebelow; the melting apparatus heats and melts the granular raw material to generate a raw material melt and supplies the raw material melt into a single-crystal production crucible positioned therebelow; and a crystallization apparatus which includes the single-crystal production crucible in which a seed single crystal is placed on the bottom, and a first infrared ray irradiation equipment which irradiates an infrared ray to the upper surface of the seed single crystal in the single-crystal production crucible, and the single-crystal production equipment is configured such that the raw material melt is dropped into a melt formed by irradiating the upper surface of the seed single crystal with the infrared ray, and a single crystal is allowed to precipitate out of the thus formed mixed melt.
摘要:
A crucible provided with a holding section (12) for holding a raw material (20), an initial distillate recovery section (14) for recovering an initial distillate (24) when the raw material (20) held in the holding section (12) has been vaporized, a main distillate condensing section (16) for condensing a main distillate when the raw material (20) held in the holding section (12) has been vaporized, and a crystal growing section (18) for holding the main distillate (30) comprising a raw material melt (28) condensed by the main distillate condensing section (16) and producing crystals when crystals are grown from the held main distillate (30) is used as a crucible (10) for crystal growth used to grow crystals. This makes it possible to raise the efficiency of manufacturing crystals while achieving high purification of a raw material for semiconductor crystals.
摘要:
A silicon single crystal is produced by a method wherein a silicon plate is inductively heated; granular silicon is melted on the silicon plate; and the molten silicon thus produced flows through a flow conduit in the center of the plate to a phase boundary at which a silicon single crystal crystallizes, wherein a silicon ring having a lower resistivity than the plate, and lying on the plate, is inductively heated prior to inductively heating the plate, and melting the ring.
摘要:
A single-crystal structure is grown using free-form fabrication through principles of directional solidification and direct-deposition techniques. The structure is formed from a metallic alloy by building from feedstock on top of and upward from a heated base element. The top of the structure is also heated with a scanning beam as it is built. The higher temperatures near the melting alloy tend to promote crystal growth rather than nucleation as the grain grows toward the heat of the scanning beam. This allows a two-dimensional thermal gradient to be formed in the build direction, which allows the solid crystal to maintain one orientation during the deposition process. As the material initially solidifies, it nucleates off of a desired grain that is designated by a grain selector. This method eliminates the need for expensive mold cavities and segmented furnaces that are typically required by prior art processes for producing some components.