93results about How to "Improve breakdown performance" patented technology

This invention discloses a gallium nitride based semiconductor power device disposed in a semiconductor substrate. The power device comprises a termination area disposed at a peripheral area of the semiconductor power device comprises a termination structure having at least a guard ring disposed in a trench filled with doped gallium-based epitaxial layer therein.

A semiconductor device includes a substrate, a SiC drift layer formed above the substrate, a GaN-based semiconductor layer that is formed on the SiC drift layer and includes a channel layer, a source electrode and a gate electrode formed on the GaN-based semiconductor layer, current blocking regions formed in portions of the SiC drift layer and located below the source and gate electrodes, and a drain electrode formed on a surface that opposes the GaN-based semiconductor layer across the SiC layer.

The invention discloses a transformer oil and a preparation method thereof. The transformer oil comprises the following components by weight: 0.05% of an antioxidant, 0.03% of a surfactant, 0.03% of BN nanoparticles and the balance of transformer base oil. The invention has the beneficial effects of substantially improving thermal conductivity and breakdown performance of the transformer oil, and at the same time increasing the dielectric strength of the transformer oil.

A MOSFET switch which has a low surface electric field at an edge termination area, and also has increased breakdown voltage. The MOSFET switch has a new edge termination structure employing an N-P-N sandwich structure. The MOSFET switch also has a polysilicon field plate configuration operative to enhance any spreading of any depletion layer located at an edge of a main PN junction of the N-P-N sandwich structure.

The invention relates to an SOI (Silicon on Insulator) technology, which solves the problems of uneven distribution of electric field with both high ends and low middle during breakdown and insufficient utilization of a drift area of a traditional SOILDMOS (Silicon on Insulator Lateral Double Diffused Metal Oxide Semiconductor) device. The invention provides an SOI variable buried oxide layer thickness device and a preparation method thereof. in the technical scheme, the SOI variable buried oxide layer thickness device comprises a source electrode, a drain electrode, a buried oxide layer and n-shaped top SOI impurity material layer, and is characterized in that the thickness of the buried oxide layer is gradually reduced from the source electrode to the drain electrode; and the thickness of the n-shaped top SOI impurity material layer is gradually increased from the source electrode to the drain electrode. The invention has the advantage of largely enhanced breakdown performance, and is suitable for the SOILDMOS device.

The invention discloses a lateral diffusion eGaN HEMT device integrating a reverse diode and an embedded drain electrode field plate. The device comprises a GaN buffer layer, an AlGaN barrier layer, agate electrode, an under-gate insulating layer, a source electrode, a source electrode extension section, a source electrode field plate, an MIS schottky diode extension section, an MIS schottky diode insulating layer, a p-type GaN or groove, a drain electrode, a passivation layer and an AlN staggered-layer drain electrode embedded field plate, wherein the MIS schottky diode insulating layer is prepared in the middle region, towards the MIS schottky diode extension section and the AlGAN barrier layer surface, of the source electrode field plate; the side, close to the drain electrode, of thediode adopts the p-type GaN or groove, so that the breakdown characteristic of the device is improved; the embedded staggered-layer field plate is adopted below the drain electrode, so that anti-breakdown capability of the drain electrode to the substrate is improved; the design of the staggered layer is suitable for the gradual change distribution of the drain electrode electric field from rightto left, so that the breakdown characteristic of the device is improved; and the source electrode field plate is extended, the gate electrode is wrapped, the MIS schottky diode is formed on the gate drain side, and the diode is made into a block isolation mode, so that the drain electrode current is greatly improved.

A method for forming a high electron mobility transistor (HEMT) device with a plurality of alternating layers of one or more undoped gallium nitride (GaN) layers and one or more carbon doped gallium nitride layers (c-GaN), and an HEMT device formed by the method is disclosed. In one embodiment, the method includes forming a channel layer stack on a substrate, the channel layer stack having a plurality of alternating layers of one or more undoped gallium nitride (GaN) layers and one or more carbon doped gallium nitride layers (c-GaN). The method further includes forming a barrier layer on the channel layer stack. In one embodiment, the channel layer stack is formed by growing each of the one or more undoped gallium nitride (GaN) layers in growth conditions that suppress the incorporation of carbon in gallium nitride, and growing each of the one or more carbon doped gallium nitride (c-GaN) layers in growth conditions that promote the incorporation of carbon in gallium nitride.

The invention belongs to the technical field of super-large-scale integrated circuits and particularly relates to a super-low k material thin film and a preparation method thereof. The preparation method comprises the following steps of: preparing a sol solution by taking 1,2-bi(triethoxy silicon substrate) ethane (BTEE) as a precursor and adding surfactant P123, HCl, ethanol and deionized water; and then obtaining the super-low k material thin film by adopting a spin coating technology and carrying out post annealing treatment. By virtue of the control on the proportions of the precursor, the surfactant, catalyst and solvent, as well as the control on spin coating film-forming conditions and post treatment conditions, the super-low k material SiCOH thin film, which has the characteristics that the k value is 2.1-2.5, the leakage current density under electric field intensity of 1MV/cm is 1.5*10<-6> to 3.4*10<-9> A/cm<2>, and the Young modulus is 21.05-24.15 Gpa, is obtained.

The invention discloses a method for accurately controlling steepness when silicon carbide high-temperature ions are injected into a mask. The method comprises the steps that a silicon carbide epitaxial substrate is cleaned; a high-temperature ion injection masking layer capable of sufficiently resisting against the injected high-temperature and high-energy ions grows on the surface of the silicon carbide epitaxial substrate; an etching resisting layer used for controlling an etching process grows on the high-temperature ion injection masking layer; photoresist coats the etching resisting layer, and a selective high-temperature ion area window is formed in the surface of the etching resisting layer by adopting a photoetching developing technology, etching is sequentially carried out on the etching resisting layer and the high-temperature ion injection masking layer from the selective high-temperature ion area window to the surface of the silicon carbide epitaxial substrate; the photoresist and the unnecessary etching resisting layer are removed to obtain the steep and controllable thick-medium ion injection masking layer with the smooth lateral wall. By means of the method, angle control over an etching surface is carried out accurately, the steep thick-medium ion injection masking layer with the smooth lateral wall is obtained, and good uniformity and strong controllability of the selective ion injection area are guaranteed.

The invention relates to a method for preparing a local oxidization termination ring of a semiconductor device, which comprises the following steps of: forming a pad oxide layer and a silicon nitride layer in an edge zone of the semiconductor device on a silicon substrate; etching the pad oxide layer, the silicon nitride layer and the silicon substrate to form a plurality of grooves; carrying out local oxidation on silicon in the grooves to form a field oxide layer; and removing the pad oxide layer and the silicon nitride layer. The local oxide termination ring of the semiconductor device, which is prepared by adopting the method, has high breakdown voltage and can well improve the breakdown property of the semiconductor device.

This invention discloses a gallium nitride based semiconductor power device disposed in a semiconductor substrate. The power device comprises a termination area disposed at a peripheral area of the semiconductor power device comprises a termination structure having at least a guard ring disposed in a trench filled with doped gallium-based epitaxial layer therein.

The invention relates to a dielectric composite material and a preparation method thereof. The preparation method is characterized by comprising the following steps: carrying out hydroxylating treatment on the surfaces of barium titanate particles, then adding fluorine-containing monomers to initiate polymerization, and obtaining modified barium titanate with a core-shell structure; then using themodified barium titanate and a vinylidene fluoride-hexafluoropropylene copolymer to prepare and obtain an electrostatic spinning solvent, and then utilizing an electrostatic spinning process to obtain the dielectric composite material. The dielectric composite material and the preparation method have the beneficial effects that the barium titanate particles have a high dielectric constant, the vinylidene fluoride-hexafluoropropylene copolymer has a good breakdown property; by introduction of the fluorine-containing monomers, the monomer molecular chains have a certain quantity of fluorine atoms and are similar to a matrix polymer PVDF-HFP (Polyvinylidene Fluoride-Hexafluoropropylene) respectively, and the surfaces of the particles are coated with the monomers, so that the effect of mild transition is achieved, the compatibility between the particles and the matrix can be improved, further the particles have good dispersity, and the dielectric composite material has a high dielectric constant, high breakdown field strength and low dielectric loss.

The invention provides a junction barrier Schottky diode with a floating field ring terminal structure and a preparation method thereof, and belongs to the technical field of semiconductors. The diodecomprises a ohmic contact metal cathode, a substrate, a first epitaxial layer, a second epitaxial layer, a comb-shaped p region, a Schottky contact metal anode and an insulating layer from the bottomup, wherein the comb-shaped p region includes a plurality of PN junction p regions arranged at intervals and a plurality of floating field rings arranged at intervals on two sides of the outer side PN junction p regions. The invention further provides a preparation method of the junction barrier Schottky diode with the floating field ring terminal structure. The diode adjusts the electric field distribution through the comb-shaped PN junction structure, avoids the concentration of the electric field, disperses the electric field concentrated at the edge of the P-type region among a pluralityof field rings and reduces the maximum value of the electric field. In addition, the appropriate field ring width and gap are selected, and the electric field concentrated at the outmost field ring can be dispersed among the field rings, thereby avoiding the device breakdown caused by the excessively high local electric field.

The invention discloses a preparation method of a film capacitor composite dielectric film. The preparation method comprises the following steps: (1) adopting a one-step method to synthesize a fluorine-containing phenolic hydroxyl group polyimide precursor; (2) adopting an intercalation stripping method to prepare a high dielectric oxide nanosheet; (3) preparing a two-phase polyimide/oxide nanosheet dielectric enhancer uniformly-mixed solution, or a multi-phase (three-phase) polyimide/oxide nanosheet dielectric enhancer/boron nitride nanosheet heat conduction enhancer uniformly-mixed solution; (4) drying to obtain a two-phase or multi-phase (three-phase) fluorine-containing phenolic hydroxyl group polyimide/nanosheet composite film; and (5) carrying out high temperature treatment in nitrogen condition to obtain a two-phase or multi-phase (three-phase) fluorine-containing polybenzoxazole high temperature resistant aromatic heterocycte/nanosheet composite dielectric film. The film capacitor composite dielectric film prepared in the invention has excellent performance such as high temperature resistance, high disruptive strength, dielectric constant adjustability and high energy storage density, and the process is simple, green and environmentally-friendly and can be used for large-scale manufacturing.

The invention relates to a semiconductor manufacturing technology, in particular to a grating groove manufacturing method for silicon carbide UMOS device. According to the grating groove manufacturing method for the silicon carbide device, mainly, a dielectric layer on a silicon carbide epitaxial wafer is etched according to a grating groove area window, part of the dielectric layer on the upper surface of silicon carbide is reserved during etching, and then the part of the dielectric layer is corroded through a corrosion technology, so that the area where the dielectric layer makes contact with the silicon carbide epitaxial wafer forms a smooth arc, and a silicon carbide grating groove structure with a steep side wall, without a micro groove and with smooth bottom feet is formed on the silicon carbide epitaxial wafer after etching. The method has the advantages that the silicon carbide grating groove structure with the steep side wall, without the micro groove and with the smooth bottom feet is obtained, the electric field concentration effect at the bottom of a groove grate is reduced, and breakdown property and reliability of the device are improved. The method is particularly applicable to silicon carbide grating groove structure manufacturing.

The invention discloses a preparation method of a high-breakdown and high-dielectric FPE-based composite material film, and relates to the technical field of FPE-based composite material films. The invention aims to solve the problems that the dielectric constant of a traditional composite material film taking FPE as a matrix is low, the dielectric loss and the conductivity of the composite film doped with filler are obviously increased, and the breakdown field strength is reduced. The method comprises the following steps: adding hexagonal boron nitride nanosheets into a methyl pyrrolidone solution, and carrying out ultrasonic dispersion to obtain a mixed solution a; adding SiO2 particles into the mixed solution a, and performing ultrasonic dispersion to obtain a mixed solution b; adding fluorene polyester particles into the mixed solution b, and conducting stirring for 1-2 hours to obtain a stirred mixed solution b; and uniformly coating one surface of a pretreated substrate with the stirred mixed solution b, heating the substrate, carrying out heat preservation, finally cooling the substrate to room temperature, and stripping the film on the substrate to obtain the high-breakdown and high-dielectric FPE-based composite material film.

The invention discloses a composite dielectric material with a three-layer structure. The material comprises dielectric enhancement layers and a voltage-withstanding enhancement layer clamped betweenthe dielectric enhancement layers, the dielectric enhancement layers are made of a ferroelectric polymer/dielectric ceramic filler compound, and the voltage-withstanding enhancement layer is a lineardielectric high-molecular polymer. The invention further provides a preparation method of the composite dielectric material. The preparation method comprises the following steps: S1, dissolving a ferroelectric polymer in N,N-dimethylformamide, adding a dielectric ceramic filler, carrying out ultrasonic dispersion to obtain a mixed solution, coating a quartz glass plate with the mixed solution, andconducting drying and scraping to obtain a dielectric reinforced film; S2, coating the quartz glass plate with the N,N-dimethylformamide solution of the linear dielectric high-molecular polymer, andconducting drying and scraping to obtain a pressure-resistant reinforced film; and S3, clamping the pressure-resistant reinforced film between the dielectric reinforced films, carrying out hot press molding, and conducting cooling to obtain the composite dielectric material with a three-layer structure. The composite dielectric material has high energy storage efficiency and energy storage density.

The invention relates to a nanofluid-based electro-hydraulic breakdown and infrared thermal radiation coordinated punching device and method, the device comprises a drill rod, a movable hole packer, an electro-hydraulic breakdown assembly and an infrared radiation heating assembly, the punching device is installed at a planned punching position, the hole packer is used for sealing a hole, and theelectro-hydraulic breakdown assembly and the infrared radiation heating assembly are installed at the same time. Then a liquid injection pump station is used for injecting nanofluid into the liquid injection cavity, then a high-voltage electric pulse generator supplies power to the positive and negative electrode plates to trigger the electro-hydraulic effect to conduct punching, and finally an infrared heater is started to crack the coal body through thermal stress. The high-pressure electro-hydraulic punching technology and the infrared thermal radiation heating technology are combined by adopting the nanofluid which is an energy transport working medium with high heat transfer performance, the advantages that electro-hydraulic breakdown is convenient and easy to precisely control can beexerted, the coal body can be rapidly heated and cracked by utilizing infrared radiation heating, and the purposes of coal seam permeability improvement and crack development are efficiently achieved. The method is simple, reliable in performance and convenient to maintain, and has a wide engineering application prospect.