70 results about "Vapour phase epitaxy" patented technology

The invention discloses a concentric-ring sprayer structure for material vapor phase epitaxy, which solves the problem that the large-area deposition region provides a uniform flow field of a precursor gas mixture in a large-substrate or multi-substrate crystal growth process. The sprayer structure comprises more than one independent air inlet pipeline, wherein each air inlet pipeline is provided with a controller for monitoring and regulating inlet gas flow speed and flow rate; the bottom of the sprayer is provided with an air outlet baffle; more than one concentric ring is arranged in the sprayer; independent cavities are formed among the concentric rings and are mutually separated; the top end of each concentric ring is connected with one independent air inlet pipeline; and the air outlet baffle at the bottom end of each concentric ring is provided with one or more air outlets. The air sources are mutually separated and independently controlled; and the multi-sprayer integrated use mode obviously improves the quality of the large-area deposited grown crystal, and greatly enhances the production efficiency.

The template type substrate is used for opto-electric or electrical devices and comprises A) a layer of bulk mono-crystal nitride containing at least one element of alkali metals (Group I, IUPAC 1989) and B) a layer of nitride grown by means of vapor phase epitaxy growth wherein the layer A) and the layer B) are combined at non N-polar face of the layer A) and N-polar face of the layer B). Therefore, the template type substrate has a good dislocation density and a good value of FWHM of the X-ray rocking curve from (0002) plane less than 80, so that the resulting template type substrate is very useful for the epitaxy substrate from gaseous phase such as MOCVD, MBE and HVPE, resulting in possibility of making good opto-electric devices such as Laser Diode and large-output LED and good electric devices such as MOSFET.

There is provided a susceptor for a vapor phase epitaxial growth device, by which skidding at the time of loading a silicon wafer is prevented and the wafer can be loaded at a fixed position of the susceptor: wherein a ring-shaped groove having sloping planes widening toward a surface of the susceptor are formed on the outermost circumference of the bottom surface; and gas release openings penetrating through to the back surface of the susceptor are formed, each having a sectional area of 2.0 to 3.0 mm² and a ratio of all opening areas is 0.25 to 0.5% on the bottom surface.

The invention relates to a silicon dioxide nano particle dot matrix mask used in a GaN film of hydride gas phase epitaxial growth, and a preparation method thereof, characterized by that a SiO2 nano particle lattie is used as a mask for GaN transversely epitaxial over growth. A layer of metal Al is evaporated by electron beam on a GaN form board firstly. Porous anode alumina (AAO) is prepared by electrochemistry then. A layer of dielectric SiO2 layer is deposited then. AAO is removed by acid solutionor aqueous alkali. Therefore, dot matrix distribution of SiO2 nano particle is obtained on the GaN form board. After cleaning treatment, the form board as a substrate is put in a HVPE reaction chamber for GaN thick film growth. The invention simplifies the photo-etching mask manufacturing technology greatly, and reduces the size of the mask to nanometer level, while metal Al and SiO2 layer can be prepared through electron beam evaporation and sputtering method for batched production.

The invention discloses a fan-shaped spray head structure for vapor phase epitaxy of a material. A first precursor, a second precursor and various protective gases are sufficiently mixed in a large-area reaction region to form a relatively uniform flow field. The structure disclosed by the invention comprises more than one gas inlet pipeline; a controller for detecting and controlling the gas inlet flow rate and flow is arranged on the gas inlet pipeline; more than one fan-shaped independent isolation region is arranged in a cavity of the spray head; a sealing plate at the top end of the isolation region is connected with the gas inlet pipeline; one and more gas nozzles are formed on a gas outlet baffle at the bottom end of the isolation region; and a round reaction cavity is arranged below the spray head. According to the invention, large-scale production of III group-nitride semiconductor material is realized, and the production efficiency of the III group-nitride semiconductor material is improved.

The invention discloses a vapor phase epitaxy device and a vapor phase epitaxy method. The disclosed vapor phase epitaxy device comprises a reaction chamber, a plurality of reaction gas spraying heads arranged in the reaction chamber, a plurality of trays corresponding to the plurality of reaction gas spraying heads, and a power shaft driving the trays, wherein the power shaft comprises revolution shafts and a plurality of rotation shafts, the rotation shafts correspond to the trays one by one; and the trays are respectively connected with the corresponding rotation shafts, or connected with the revolution shafts and the corresponding rotation shafts alternatively. By utilizing the vapor phase epitaxy device and the vapor phase epitaxy method, the flow instability in the chemical vapor phase epitaxy can be reduced effectively, the spurious response times can be decreased, also the problem of the thickness of a quantum well can be solved effectively, different selections can be provided for the growing process of different heterogenous junctions, and the quality of semiconductor elements can be improved.

The invention relates to a method for improving photoelectric detector performance by cutting band gap wavelength in lattice matching system. The method comprises the following steps of: growing a buffer layer, a light absorption layer and a wide band gap cap layer which hare matched with lattices on a substrate by using an MBE (molecular beam epitaxy) method or metallorganics vapour phase epitaxy method to obtain an epitaxial structure of a photoelectric detector, wherein the band gap of the light absorption layer can be cut and set during the growth process, and the wide band gap is selected on the premise of meeting cut-off wavelength requirement of the long wave end of the photoelectric detector. According to the invention, the material growing method is simple; by cutting and setting the band gap of the light absorption layer of the photoelectric detector, the device performance can be obviously improved under the condition of basically not changing the original design of the device, and the detectivity can be enhanced by more than three times. The method is not only suitable for manufacturing photoelectric detectors in different kinds of III-V compound material systems, but also suitable for manufacturing other types of photoelectric devices and electronic devices; and the application of the method can be widened to other material systems. The method has a good application prospect.

This invention relates to a method for altering the pole of GaN epitaxial layer grown by HVPE characterizing in applying a method of interrupting HCl growth, which first of all penetrates NH3 to nitride the Sapphire under high temperature then penetrates HCl to grow GaN, this time, the GaN film surface shows N pole, then closes HCl after growing for a period of time and continues NH3 for 1-60min, then opens the HCl to grow GaN film continuously and operates like this for 2-10 times, the pole of GaN turns to Ga of a smooth surface from a rough N pole surface and the dislocation density is reduced and the crystal quality is increased.

The present invention relates to a method for manufacturing graphene by vapour phase epitaxy on a substrate comprising a surface of SiC, characterized in that the process of sublimation of silicon from the substrate is controlled by a flow of an inert gas or a gas other than an inert gas through the epitaxial reactor. The invention also relates to graphene obtained by this method.

The invention relates to a nano-porous material substrate used in hydride vapor phase epitaxy (HVPE) gallium nitride (GaN) film and a preparation method thereof. The invention is characterized in that composite nano-porous material is taken as a substrate for epitaxially growth of a thick film GaN, and the quality of crystalloid can be improved, meanwhile, the substrate can be conveniently stripped. A metal Al thin layer is firstly sedimentated on a GaN template taking Si as the substrate, even porous meshed anodic aluminum oxide (AAO) is formed by an electrochemic method, porous GaN material is obtained by erosion of technologies such as induced coupling plasma etching (ICP) and the like, and the bottom of the holes are exposed outside the surface of the Si substrate; on this basis, a corrosion method is adopted to realize the corrosion for Si and obtain the composite nano-porous structure; by the superficial treatment, the Si is covered with a SiNx layer or SiO2 layer, so as to meet the requirements of subsequent epitaxial growth. After being washed, the product is put into an HVPE system, and the thick film GaN layer grows. The invention greatly simplifies the technique for manufacturing a mask film by photoetching, and is suitable for scientific experiments and batch production.

The invention discloses a square spray nozzle structure for vapor phase epitaxy of a material. The square spray nozzle structure solves the problem of providing a uniform precursor mixture for a large substrate and a large deposition region. The square spray nozzle structure is characterized in that multiple independent isolation regions are sequentially formed in a square spray nozzle from top to bottom, the top of the square spray nozzle is provided with input pipelines communicated with the isolation regions, multiple gas spray pipes are arranged at the bottom of the isolation regions, and nozzle orifices of the gas spray pipes are arranged at the bottom of the square spray nozzle. According to the square spray nozzle structure, a precursor and various gases are mixed and then deposit on the surface of the substrate through the independent isolation regions and the combined utilization manner of the multiple spray nozzles, and the production efficiency is improved.

The invention discloses hydride vapour phase epitaxy (HVPE) equipment. The hydride vapour phase epitaxy equipment comprises a water-cooling stainless steel vacuum chamber, an insulating layer, a source heater, a substrate heater, a chamber thermal insulation device, an internal reaction chamber, a substrate tray, a rotating mechanism, an air jet hole, a metal boat, a sample inlet, a sample outlet and the like. Compared with conventional HVPE equipment, the HVPE equipment provided by the invention has the advantages that firstly, the water-cooling stainless steel chamber is used for replacing a conventional quartz chamber, and secondly, a built-in heater in the vacuum chamber is used for replacing a conventional external heater.

The invention provides a drainage rotary substrate carrying device and vapor-phase epitaxy equipment. The drainage rotary substrate carrying device comprises a gas source device, a mother disc, a rotating device and a son disc, wherein the gas source device is used for providing source gas of vapor-phase epitaxy and the flowing mode of the source gas comprises rotary flowing; the mother disc is located below the gas source; the rotating device is connected to the mother disc so as to provide rotary power to the mother disc; and the son disc is used for carrying a substrate, the son disc is connected to the mother disc through a rotating shaft, and a volute runner is arranged on the son disc for guiding the source gas rotating rotatably to flow in the volute runner so as to drive the son disc to rotate. By pushing the son disc to rotate by the source gas in a volute line flowing mode on the surface of the son disc, planetary rotation of the device is achieved. According to the device, it is not needed to inject gas to the son disc additionally, so that a condition that residual gas damages the atmosphere of the edge of the substrate is avoided and the yield of epitaxial wafers is improved, and meanwhile, high purity flow and related gas control components can be further saved, so that the cost of the equipment is lowered greatly.

A vapor phase epitaxy device comprises a bottom plate, an upper cover plate, side walls located between the bottom plate and the upper cover plate and a substrate on the bottom plate. The bottom plate, the upper cover plate, the side walls and the substrate constitute a reaction cavity. The vapor phase epitaxy device further comprises at least four air discharge ports distributed at lower ends of the side walls at equal included angles, and a heating device located on the upper cover plate and opposite to the substrate, wherein the at least four air discharge ports are used for discharging air in the reaction cavity, and a plurality of heating lamp tubes are distributed on the heating device. The vapor phase epitaxy device improves uniformity of an epitaxy layer.

The invention relates to a vapor-phase epitaxy deposition apparatus realizing nitride crystal homoepitaxy. The device comprises a metal chloride supply chamber and a vapor-phase epitaxy reaction chamber. A heating device and a ventilation pipe are arranged outside the supply chamber. A quartz vessel is arranged inside supply chamber for accommodating a metal source. A reaction gas feeding device is arranged on the upper part of the vapor-phase epitaxy reaction chamber. A sheet carrier palate is arranged inside the vapor-phase epitaxy reaction chamber and is used for accommodating substrate materials. Heating devices are arranged above and below the sheet carrier plate. The device provided by the invention has the advantage that the heating devices are arranged above and below the sheet carrier plate, such that temperature gradient distribution in the reaction chamber is changed. Advantages of hydride vapor-phase epitaxy and metal organics chemical vapor-phase epitaxy are composed, such that nitride hydride epitaxy and metal organics epitaxy are realized in a same reaction chamber. Therefore, thick film and thin film epitaxial growth are realized, and homoepitaxy is realized. The invention can also be used in a process for improving an independent metal organics epitaxy process through changing the temperature gradient in the reaction chamber. Therefore, nitride crystal quality can be improved, and device performance can be improved.

The invention relates to the technical field of semiconductors, and discloses a hydride vapor phase epitaxy gallium boat structure which comprises a boat body, and further comprises a gallium source inlet formed in the top of the boat body. A liquid gallium source is contained in the boat body. A reactant outlet pipeline arranged in the boat body, the top end of thereactant outlet pipeline is higher than the liquid level of theliquid gallium source, the bottom end of the reactant outlet pipeline penetrates out of the bottom wall of the boat body; a gas distribution disc is also arranged on thebottom wall in the boat body, a hydrogen chloride inlet is formed in the side face of the gas distribution disc, at least one hydrogen chloride outlet is formed in the top end of a pipeline of the gas distribution disc, and each hydrogen chloride outlet is located below the liquid level of the liquid gallium source. The gallium boat structure has the advantages that the hydrogen chloride conversion rate is high, the contact area of hydrogen chloride and a liquid gallium source is large, and the hydrogen chloride path is effectively prolonged.

The invention relates to a method for the cost-effective and environmentally friendly production of alkyl indium sesquichloride in high yield and with high selectivity and purity. The alkyl indium sesquichloride produced according to the invention is particularly suitable, also as a result of the high purity and yield, for the production, on demand, of indium-containing precursors in high yield and with high selectivity and purity. As a result of the high purity, the indium-containing precursors that can be produced are particularly suitable for metal organic chemical vapour deposition (MOCVD) or metal organic vapour phase epitaxy (MOVPE). The novel method according to the invention is characterised by the improved execution of the method, in particular a rapid process control. Owing to targeted and extensive use of raw materials that are cost-effective and have a low environmental impact, the method is also suitable for use on an industrial scale.

The invention discloses a reactor and a method for hydride vapor phase epitaxy (HVPE) of a nitride semiconductor material. The reactor comprises an axial symmetrical cylindrical reaction cavity, a concentric annular spray nozzle, a heater, a graphite boat, a substrate and the like, wherein the graphite boat and the substrate are heated by adopting resistance wire or infrared light irradiation; three to six gas outlet channels with rectangular cross sections are arranged in the tangential direction of the outer wall of the bottom end of the cavity; a concentric annular buffer strip is arranged among the outlet channels and the inner wall of the cavity, and a concentric annular flow collecting channel is arranged on the peripheries of the outlet channels; the outlet channels are communicated with the flow collecting channel. The reactor disclosed by the invention has the advantages that reactant gas forms micro-rotational flow in the effective growing zone of the substrate, so that the epitaxial growth thickness and the uniformity of components are obviously improved; as a graphite boat rotating device and auxiliary assemblies in a conventional reactor are omitted, the reactor is simplified, energy-saving and convenient to maintain, and the adverse impact of the rotating movement instability on the epitaxial growth is also eliminated.

The invention belongs to the field of chemical liquid phase deposition, particularly relates to a preparation method for a polycrystalline mercury iodide film seed crystal layer and solves the problems that the pollution of solvent and reaction by-products are difficult to remove during solution precipitation in the prior art. According to the preparation method for the polycrystalline mercury iodide film seed crystal layer, provided by the invention, yellow mercury oxide (HgO) and hydroiodic acid (HI) are used as basic materials, and the reaction rate between the HgO and (HI) is controlled by adjusting the concentration of the HI added into a system, so that fine mercury iodide particles are generated. The generated fine mercury iodide particles deposit on a substrate (electrode) material to form a layer of homogeneous film, so that directional crystal nucleuses are provided for gas phase epitaxial growth, thereby increasing one-way growth probability of the film.

The invention discloses a multi-wavelength InGaN/GaN multi-quantum well structure based on a GaN dodecahedral cone and a preparation method thereof. An N-surface self-supporting GaN substrate materialis corroded through hot H4PO3 to form a micro-nano GaN dodecahedral cone structure; stress in the GaN dodecahedral cone obtained through corrosion is greatly released, so that the crystal quality ofa sample can be effectively improved, the luminous efficiency can be effectively improved, and subsequent epitaxial regrowth is facilitated; and an InGaN/GaN multi-quantum well layer is grown on a GaNdodecahedral cone template by using the metal organic chemical vapor phase epitaxy technology. According to the method, different sizes of cones can be obtained by controlling the concentration of the corrosive liquid, the corrosion temperature and the corrosion time; white light emitting can be achieved by reasonably adjusting the size of the cone and the In component; and the method is a possible way for achieving single-chip fluorescent-powder-free white light emitting. The method provided by the invention does not need a patterned substrate, is low in process cost, is simple and feasible,and is suitable for large-scale preparation.

The invention provides a vapor phase epitaxy system. The vapor phase epitaxy system comprises a carrying disc supporting device, a cover body, a reaction chamber and a top cover assembly. The carrying disc supporting device penetrates through the cover body, and the cover body is connected with the carrying disc supporting device; the reaction chamber comprises an inner chamber and an outer chamber, and the inner chamber is arranged in the outer chamber; the top cover assembly is located at one end of the reaction chamber and comprises an air inlet pipeline and an air inlet flange, the air inlet flange is connected with the outer chamber through a fastening device, and the air inlet pipeline communicates with the inner chamber to supply air to the inner chamber; an opening is formed in the other end, away from the top cover assembly, of the inner chamber, the cover body is used for conducting airtight opening and closing on the opening of the inner chamber, and the carrying disc supporting device is movably arranged in the inner chamber; and the reaction chamber can move along with the carrying disc supporting device through the cover body, so that closing between the top cover assembly and the reaction chamber is achieved. According to the vapor phase epitaxy system provided by the invention, the chamber can be opened from different positions under different working conditions by introducing a double-lifting structure of the reaction chamber and the carrying disc supporting device, so that equipment maintenance is facilitated, and the maintenance process is simplified.