43 results about "Silicon matrix" patented technology

The invention discloses an organic silicon heat-conducting gasket and a preparation method thereof, and the preparation method comprises the following steps: mixing and uniformly stirring an organic silicon matrix, a heat-conducting filler, a nano material and a fibrous reinforcing filler to obtain mixed slurry; wherein the organic silicon matrix accounts for 10 to 50 parts; 20 to 80 parts of a heat-conducting filler; 1 part to 10 parts of a nano material; 1 part to 10 parts of fibrous reinforcing filler; the heat-conducting filler comprises surface-modified flaky boron nitride; the mixed slurry is subjected to multiple times of blade coating, forming and curing on a substrate, and an organic silicon heat conduction blank with sheet-shaped boron nitride oriented in the thickness direction is obtained; and cutting the organic silicon heat-conducting green body along the direction perpendicular to the blade coating plane to obtain the organic silicon heat-conducting gasket which is provided with a heat-conducting network in vertical orientation. According to the organic silicon heat-conducting gasket disclosed by the invention, extremely high heat conductivity coefficient can be obtained in the vertical direction by using relatively low heat-conducting filler content; meanwhile, the compression resilience of the gasket is obviously improved.

The invention discloses high-wettability reactive nano-silver ink for flexible electronics and a preparation method and application thereof.The preparation method comprises the following steps that S1, silver citrate is weighed and placed in a container, ammonia water is added, and a mixture A is obtained; s2, adding a citric acid solution and organic alcohol into the mixture A to obtain a mixture B; s3, adding ascorbic acid into the mixture B, performing ultrasonic treatment, and filtering to obtain filtrate which is a mixture C; and S4, a surfactant is added into the mixture C, the surfactant is one or more than two of a polyoxyethylene acid ester surfactant, a polyether modified siloxane surfactant and a phenyl ether surfactant, and the ink is obtained after ultrasonic filtration. The prepared ink has excellent stability, can realize low-level rapid sintering, and shows excellent wettability on a silicon substrate.

The application discloses a kind of organic silicon composite functional materials and its wireless monitoring system and method for intelligent application, the interface film includes by outer to inner sequentially stacked anti-fouling and wetting-resistant surface layer, hydrogen bond enhanced dynamic adaptive layer and inorganic filler modulus enhanced protective layer.Anti-fouling and wetting-resistant surface layer is composed of organic silicon elastomer composite material, hydrogen bond enhanced dynamic adaptive layer is introduced by blending in organic silicon matrix into the modified component containing urea group and the like can form hydrogen bond functional group, and inorganic filler modulus enhanced protective layer is introduced by inorganic filler such as barium titanate to improve modulus and compression resistance.The interface film is integrated with pressure sensor module, wireless communication module and host computer system, to form a complete wireless pressure monitoring system, realize real-time transmission of pressure signal, visual display, threshold alarm and data management.The application is suitable for wearable health monitoring, medical care, child companion guardianship and robot touch and the like fields.

The invention provides a production method of a low contact resistance TOPcon battery, and relates to the technical field of TOPcon batteries. The invention discloses a production method of a low-contact-resistance TOPcon battery. The production method comprises the following steps: inspecting and cleaning a silicon wafer; laser selective texturing is carried out, and a pyramid surface is formed in a light absorption area; carrying out poly deposition on the front surface by adopting PECVD (Plasma Enhanced Chemical Vapor Deposition), and introducing borane to form primary B doping; and high-temperature annealing. In the current texturing process, a texturing groove is removed, a cleaning groove is reserved, after cleaning, front poly layer deposition and B elementary substance deposition are carried out in the first step, annealing operation is carried out after completion, then the texturing groove is added in the back BSG removing process, a pyramid structure is formed on the surface of the silicon wafer, and light absorption is improved. The method avoids the situation that defects in the silicon substrate are excited and amplified in a high-temperature environment, and meanwhile, a low-temperature process can be adopted, so that more energy is saved.

Systems and techniques for facilitating quantum tuning via permanent magnet flux elements are provided. In various embodiments, the system may include a qubit device. In various aspects, the system may further include a permanent magnet having a first magnetic flux, wherein the operating frequency of the qubit device is based on the first magnetic flux. In various cases, the system may further include an electromagnet having a second magnetic flux that tunes the first magnetic flux. In various cases, the permanent magnet may include a nanoparticle magnet. In various embodiments, the nanoparticle magnet may include manganese nanoparticles embedded in a silicon matrix. In various aspects, the system may also include electrodes that apply a current to the nanoparticle magnet in the presence of the second magnetic flux, thereby changing the strength of the first magnetic flux.

The invention relates to a method for detecting carbon coating integrity of silicon negative electrode powder. The silicon negative electrode powder comprises a silicon substrate and a carbon coating layer. The detection method comprises the following steps: contacting an alkaline solution with each group of silicon negative electrode powder in a sealed container; monitoring the pressure change in the container, and recording the gas pressure change rate from the reaction start to the first time range; calculating the gas production rate of the silicon negative electrode powder per unit mass according to the gas pressure change rate; and according to the gas production rate, the difference of the carbon coating completeness of the multiple groups of silicon negative electrode powder is judged. The reaction rates of the silicon negative electrode powder with different coating completeness and the alkaline solution are different, and the gas generation rates are also different, so that the real-time air pressure changes in the sealed container are also different. By monitoring the pressure change in the container in real time, real-time data recording and curve drawing can be realized, the material reaction condition can be calculated, the gas production rate and the gas production rate can be dynamically evaluated, and the coating characteristic difference identification of the silicon negative electrode powder can be realized in a quantitative manner.

The invention discloses a non-combustible reed fiber-silicon composite material based on charge reconstruction driving molecular bridging and a preparation method of the non-combustible reed fiber-silicon composite material, and relates to the technical field of building materials and functional composite materials. The composite material is composed of Portland cement, cationic carbon dot modified reed fibers, regular octahedral Cu-MOF nanoparticles, water and a silane coupling agent, and fiber-cement interface charge reconstruction and molecular bridging are achieved through cationic carbon dots, and the confinement catalytic char forming effect of regular octahedral Cu-MOF is cooperated; the interfacial compatibility and stress transfer efficiency between the reed fiber and the silicon matrix are remarkably improved, so that the composite material has high compressive strength and bending strength, high thermal stability, excellent flame retardance and smoke suppression, can meet the application requirements of non-combustible building boards, and is simple in process, environment-friendly and suitable for industrial production. The method is suitable for popularization and application in practical engineering.

The invention discloses a lead-oxygen-silicon composite solid electrolyte material and a preparation method of a lead-oxygen-silicon battery, and relates to the technical field of solid-state batteries, the material comprises the following components by weight: 15-30 parts of a lead-oxygen compound; 40 to 60 parts of a mesoporous silicon substrate; 1-5 parts of a rare earth element dopant; 0.5-3 parts of an alkaline earth metal dopant; the lead-oxygen compound is compounded to serve as an ion conduction core, the rare earth element and the alkaline earth metal doping agent are matched to form a synergistic system, the ion conduction environment can be optimized, the ion migration efficiency can be improved, free lead ions can be anchored through the chemical effect, lead ion dissolution is greatly reduced, and the lead-ion conductivity is improved. The environmental protection property and the ion conduction capability are considered; and meanwhile, a hierarchical porous structure is constructed by virtue of a mesoporous silicon substrate, so that the lead oxide compound is loaded in order in a nano form, a pore channel is accurately filled with a polymer phase, a continuous and stable ion conduction path is formed, and the problems of high interface impedance and discontinuous conduction path of the traditional electrolyte are effectively solved. [1] The synergistic compounding of the rare earth element and the alkaline earth metal dopant in the patent is the core innovation point, the multi-stage material is only used as the auxiliary innovation, and when an embodiment is written, only the contrast of the core innovation point needs to be written, and the contrast does not need to be written by using the multi-stage material.

The invention discloses a nucleic acid extraction and purification reagent, a kit and a use method. Reagents of the kit comprise a cell lysis solution, a digestive enzyme, a binding solution, a rinsing solution and an eluent, wherein the binding solution contains an alcoholic solution and sodium salt. Compared with similar kits on the market, the kit provided by the invention has the advantages that a sodium salt reagent is also added in the binding solution besides an alcoholic solution, meanwhile, the mass ratio of sodium salt is optimized, the DNA extract can be efficiently and selectively adsorbed on a centrifugal column silicon matrix membrane by adding the reagent, the yield and purity of obtained nucleic acid are remarkably improved, and the kit is suitable for large-scale popularization and application. Meanwhile, the component NaCl of the lysate is optimized and reduced, and the steps in the preparation and production process are reduced. The reagent / kit is simple in composition and low in cost, the operation method is simple and convenient, large-scale nucleic acid extraction operation is facilitated, in addition, the kit does not contain toxic and harmful reagents such as methylbenzene, dimethylbenzene, phenol and chloroform, harm to the environment and operators is small, and the modern environmental protection concept is better met.

Method for producing a shaped body from a silicon matrix composite material, wherein the shaped body is built up step by step from several layers and subsequently infiltrated with silicon, the molded body is built up using powder bed printing, also known as binder jetting, with a layer thickness of 50 to 250 µm, where SiC is used as the ceramic powder and a binder or binder-hardener system in liquid state, characterized in that the ceramic powder has a multimodal particle size distribution, the main fraction of which has a mean particle size measured by laser diffraction in the range of 40-55 µm and the percent difference (D90-D10) / D50 of the total particle size distribution is between 0.5 and 1.0 and wherein the ceramic powder comprises at least one further fraction whose mean particle sizes are 3-5 µm and / or 10-15 µm.

The application discloses a kind of based on elastomer class glass thermal interface material and preparation method thereof.The thermal interface material is prepared from raw materials including diglycidyl ether-terminated liquid polythioether prepolymer, methyl tetrahydrophthalic anhydride, ethylene glycol diglycidyl ether, catalyst and heat-conducting filler.The application realizes the high vertical orientation of heat-conducting filler by the process of hot-pressing and stack welding, and has very high thermal conductivity in the vertical direction.The R c of the thermal interface material is much lower than that of commercial thermal interface material using traditional silicon matrix, and has spontaneous contact behavior on the surface of substrate.

The utility model relates to the technical field of solar energy, disclose a kind of metal electrode for solar cell, solar cell and photovoltaic module.The metal electrode includes: be located in the metal seed layer (it is at least one layer in silver seed layer, nickel seed layer, zirconium seed layer, titanium seed layer, chromium seed layer, nickel silicon alloy seed layer, copper alloy seed layer) of silicon matrix surface grid line area, be located in the base metal grid line (it is copper grid line and / or aluminum grid line) of metal seed layer surface, and be located in the copper phosphate protective layer (it is copper phosphate layer and / or organic copper phosphate compound layer) of base metal grid line surface.The metal electrode is cooperated by metal seed layer, base metal grid line (such as copper grid line) and copper phosphate protective layer, can reduce contact resistance and ensure interface bonding force, can also save cost, can also improve the corrosion resistance of base metal grid line, the stability and reliability of the metal electrode long-term use outdoors are improved, and battery efficiency decay is slowed down.

This application relates to a negative electrode material, a method for manufacturing the same, and a lithium-ion battery. The negative electrode material includes an active material. The active material includes a porous matrix and a silicon matrix, at least a portion of which is distributed within the pores of the porous matrix. The infrared spectrum obtained by measuring the negative electrode material using an infrared spectrometer has a wavenumber of 2090 cm⁻¹. -1 The stretching vibration peak and wavenumber of the SiH2 bond are 2000 cm. -1 There are stretching vibration peaks for SiH bonds. The ratio Z of the vibration peak area of ​​SiH2 bonds to the vibration peak area of ​​SiH bonds in the anode material is 0.01 to 5.0. Within the above limited range, the silicon matrix in the anode material according to the present invention mainly exists in the form of SiH bonds, and it has become clear that the stability of SiH bonds is greater than that of SiH2 bonds, and that a silicon matrix with many SiH bonds contributes to improving the structural stability of the anode material and the mechanical performance of the silicon matrix, reduces the occurrence of side reactions between the anode material and the electrolyte, and further improves the cycle performance and expansion performance of the anode material.

The utility model relates to the technical field of solar cells, and discloses a grid line structure for a solar cell, the solar cell and a photovoltaic module. The grid line structure comprises a strip-shaped non-contact channel induction electrode and a plurality of contact auxiliary grids which are distributed at intervals, the contact type auxiliary grids and the non-contact type channel induction electrodes are alternately arranged and are parallel to each other, so that the contact type auxiliary grids and the non-contact type channel induction electrodes are not in contact with each other, and / or each contact type auxiliary grid is in crossed or stacked electric contact with the non-contact type channel induction electrodes; the contact type auxiliary grid penetrates through the passivation layer and then makes ohmic contact with the silicon substrate, and the non-contact type channel induction electrode makes contact with the surface, away from the silicon substrate, of the passivation layer so that potential difference can be formed between the non-contact type channel induction electrode and the surface of the silicon substrate. The surface sheet resistance, the grid line resistance and the surface field effect passivation effect are optimized by optimizing the grid line structure, the carrier transverse transmission loss is reduced, Auger recombination of high-concentration doping is avoided, the fill factor, the open-circuit voltage and the conversion efficiency of the cell are improved, and the cost can be reduced.

The invention relates to the technical field of coatings, in particular to a polysiloxane-containing long-acting anti-icing coating and a preparation method thereof. According to the coating, hydroxyl polysiloxane, tetraethoxysilane, fluorine chain modified cross-linkable core-shell silicon dioxide and the like are adopted as main raw materials, and efficient anchoring of a fluorine chain and molecular-level combination of an organic silicon matrix are achieved by constructing a graded core-shell structure with high binding energy. And meanwhile, a proper amount of dimethyl silicone oil (150-250 mPa.s) is introduced to cooperatively regulate and control the viscoelasticity and stress dispersion of the matrix, so that the long-acting anti-icing performance is improved. A strategy of first crosslinking and then fluorination is adopted, hydrophobic fluorine chains are gathered on the surfaces of nano particles, a compact cross-linked network is formed in the nano particles, and the mechanical strength, the wear resistance and the low-temperature impact resistance of the coating are effectively improved. The prepared coating not only obviously reduces the icing adhesive force, but also has excellent durability and repeated recycling performance.

The invention discloses a self-healing high-thermal-conductivity silicon-based flame-retardant insulating adhesive film and a preparation method thereof in the field of functional polymer materials. According to the self-healing high-thermal-conductivity silicon-based flame-retardant insulating adhesive film and the preparation method thereof, performance improvement is realized by designing two brand-new modified compounds and optimizing a formula and a process. According to the film, methyl vinyl silicone rubber is used as a basic silicon substrate, organic silicon modified borate containing dynamic disulfide bonds and epoxy siloxane grafted ammonium polyphosphate are added, and fumed silica, spherical boron nitride, magnesium hydroxide and other components are used as auxiliary materials. The preparation method comprises the steps of mixing, dispersing, drying and curing all the raw materials, and the prepared film has the characteristics of high heat conductivity, self-healing, flame retardance and insulation and is suitable for electronic device packaging and other scenes with high requirements for heat management and safety performance.

The present invention relates to a process for the production of dihydrogen, comprising a step of bringing into contact: - hydrogenated silicon obtained by bringing a silicon substrate into contact with an acid, the silicon substrate having a purity of less than or equal to 99.99%, and - an alkaline solution, whereby dihydrogen is produced.

The invention discloses a harmine-reinforced nano-modified organosilicon polymer and a preparation method and application thereof.The polymer takes polydimethylsiloxane (PDMS) as a matrix and comprises graphitized multi-walled carbon nanotubes (gMWCNTs) and harmine (PE), the PE is loaded on mesoporous silica (mSiO2) nanoparticles, the PE and mSiO2 are jointly and uniformly dispersed in a PDMS-gMWCNTs (GP) film forming system, and the film forming system is formed by compounding a polydimethylsiloxane film forming system and a harmine film forming system. The content of the gMWCNTs in the nano modified matrix GP is 0.1% (w / w), and the content of the PE in the nano modified matrix GP is 0.5-2.0% (w / w). According to the invention, peganum harmala alkaloid and a carbon nanotube material are utilized to synergistically modify an organic silicon matrix for the first time, so that synchronous improvement of actual marine antifouling efficiency, mechanical strength and ecological safety of the organic silicon polymer is successfully realized.

The application provides a silicon-carbon composite material, a secondary battery and an electronic device. The silicon-carbon composite material comprises a silicon matrix and a first layer at least partially on the silicon matrix, and the first layer comprises a conductive agent and a silicon-oxygen organic compound. The silicon-carbon composite material provided by the application improves the interface stability of the silicon matrix and the electrolyte, improves the cycle performance of the secondary battery, reduces the decomposition gas of the SEI film during over-discharge of the secondary battery, and improves the gas production problem during over-discharge of the secondary battery.

The present application relates to the technical field of coating, in particular to a long-acting anti-icing coating containing polysiloxane and a preparation method thereof. The coating uses hydroxyl polysiloxane, tetraethyl orthosilicate, fluorine chain modified cross-linkable core-shell silica and the like as main raw materials, realizes efficient anchoring of fluorine chain and molecular level combination of the organic silicon matrix by constructing a hierarchical core-shell structure with high binding energy. At the same time, a proper amount of dimethyl silicone oil (150-250 mPa·s) is introduced to synergistically control the viscoelasticity and stress dispersion of the matrix, thereby improving the long-acting anti-icing performance. The strategy of cross-linking first and then fluorination is adopted, so that the hydrophobic fluorine chain is aggregated on the surface of the nanoparticles, and a dense cross-linked network is formed in the inside, thereby effectively improving the mechanical strength, wear resistance and low-temperature impact resistance of the coating. The prepared coating not only significantly reduces the ice adhesion, but also has excellent durability and multiple cycle use performance.

The application relates to the technical field of metal recovery, and discloses a chemical silver extraction method and device for waste crystalline silicon photovoltaic cell pieces, which comprises the following steps: S1, removing the cell piece laminated piece, cutting and separating the metal frame and the glass and crushing; S2, putting the crushed pieces into an acid leaching device and adding a nitric acid-hydrofluoric acid mixed leaching agent; S3, filtering after reaction to obtain a silver-containing filtrate and a silicon residue; and S4, adding saturated NaCl solution into the silver-containing filtrate to generate white AgCl precipitate, filtering after standing and collecting the AgCl precipitate. The chemical silver extraction method for the waste crystalline silicon photovoltaic cell pieces realizes synchronous leaching of silver and aluminum, etching of silicon nitride and release of silver ions through one-step room-temperature synergistic leaching of a nitric acid-hydrofluoric acid compound system, and efficiently dissolves the aluminum paste layer in a short time, protects the silicon matrix, and realizes synchronous leaching of silver and aluminum and protection of the silicon matrix in a short time. In combination with a short-process silver chlorination and zinc powder replacement process, high-purity elemental silver and reusable silicon material are directly obtained, and the core problems of high energy consumption, low purity and heavy pollution in the traditional process are solved.

The invention discloses a preparation method of a bio-based repairable flexible conductive organosilicon film. The preparation method comprises the following steps: firstly, reacting bio-based polyol PO3G (poly trimethylene ether glycol) with isophorone diisocyanate to obtain an isocyanate-terminated bio-based prepolymer; then, bis (3-aminopropyl) terminated polydimethylsiloxane (PDMS) and a mixed chain extender of 4, 4 '-(hexafluoroisopropylidene) diphenol and isophthaloyl hydrazine are sequentially used for two-step chain extension, and a bio-based organic silicon matrix with a repairable function is constructed; and finally, compounding with a multi-walled carbon nanotube to prepare the organic silicon film with flexibility, conductivity and self-repairing function. The material can be applied to manufacturing of flexible electronics and wearable equipment.

The invention discloses a method for enhancing toughness and heat conductivity of heat-conducting aluminum oxide, and particularly relates to the technical field of heat-conducting materials. The method comprises the following steps: S1, preparation of nano heat-conducting fibers, S2, modification of heat-conducting aluminum oxide powder, and S3, preparation of a heat-conducting composite material. According to the method for enhancing the toughness and the heat conductivity of the heat-conducting aluminum oxide, through high length-diameter ratio and surface functionalization treatment of the nano heat-conducting fibers, an interface between aluminum oxide particles and a matrix can be effectively bridged, a fiber-aluminum oxide-matrix synergistic heat-conducting network is formed, phonon scattering is reduced, and the heat-conducting property is greatly enhanced; the superfine nano heat-conducting fibers are added into the heat-conducting aluminum oxide powder to form a special heat-conducting channel with the organic silicon matrix, so that the interface thermal resistance is remarkably reduced, and the comprehensive heat-conducting property of the material is greatly improved. 2-3.5% of nano heat-conducting fibers are added into the heat-conducting silicone grease, so that the heat conductivity can be improved by 2.5-5 W / (m.K); and 3-3.5% of the additive is added into heat-conducting silica gel, so that the heat conductivity can be improved by 2.8-6 W / (m.K).

This invention relates to the field of luminescent materials technology, specifically to a method for preparing room-temperature solid-state phosphorescent stable dual-matrix carbon nanodots and their applications. The method uses dextrin, 3-aminopropyltriethoxysilane, and boric acid as raw materials. By simultaneously introducing a silicon matrix and a boron matrix to form a dual-matrix system, the method combines the excellent stability of the silicon matrix with the unique electronic modulation capabilities of boron. Room-temperature solid-state phosphorescent stable dual-matrix carbon nanodots are synthesized via a hydrothermal method. After three cycles of water immersion-drying, the phosphorescence intensity of the obtained dual-matrix carbon nanodots decreases by only 6% to 7%. The carbon nanodots synthesized by this method have broad application prospects in the fields of anti-counterfeiting and information encryption.

The utility model discloses a TBC solar cell structure, comprising a silicon substrate, the silicon substrate is divided into a front surface and a back surface, the front surface of the silicon substrate is provided with a passivation layer, one end surface of the passivation layer far away from the silicon substrate is covered with an antireflection layer, the back surface of the silicon substrate is provided with a first area and a second area, and the first area and the second area are arranged on the silicon substrate. The first regions and the second regions are alternately distributed on the back surface of the silicon substrate, a silicon nitride layer is arranged on each first region, a separation groove is formed between each first region and each second region, a first electrode and a second electrode are further arranged on the silicon substrate, a tunneling oxide layer is arranged on the silicon substrate, and the tunneling oxide layer is a SiO2 tunneling oxide layer. Compared with the prior art, the TBC solar cell structure provided by the utility model can perform separation protection on the connecting lines on the cell panel, thereby effectively reducing the probability of short circuit of the connecting lines of the TBC solar cell, effectively improving the yield of the TBC cell during production, and reducing the production cost.

The invention relates to the technical field of organic silicon functional materials, and particularly discloses an antistatic organic silicon release film and a preparation method thereof.The antistatic organic silicon release film comprises a film base material and a release agent coated on one side of the film base material; the release agent is prepared from the following raw materials: an organic silicon resin matrix, antistatic ionic liquid, a cross-linking agent, a catalyst, a flatting agent and a tackifying aid, the preparation method comprises the following steps: carrying out a pre-grafting reaction on antistatic ionic liquid and a part of a cross-linking agent under the action of a catalyst to form an antistatic functional prepolymer, and dispersing the antistatic functional prepolymer in an organic silicon matrix for cross-linking curing. The method effectively solves the problems that the ionic liquid is poor in compatibility and easy to migrate and separate out in an organic silicon system. The obtained release film has excellent and lasting antistatic performance, stable release force and good adhesive force, and is suitable for the field of high-end optical and electronic die cutting.

The invention relates to the field of filler dispersion processes, and discloses a filler dispersion process for improving the thermal stability of an organic silicon insulating material, which comprises the following steps: S1, filler screening and characterization: screening at least two high-temperature-resistant fillers from hexagonal boron nitride, muscovite and phlogopite based on the microscopic characteristics of the fillers, the type, the particle size, the morphology and the crystal structure of the filler are systematically characterized; s2, surface chemical modification: carrying out surface chemical modification on the screened filler, and enhancing the interface bonding force between the filler and an organic silicon matrix through coupling agent treatment or functional modification; s3, multi-component filler synergistic dispersion; s4, optimizing process parameters; and S5, forming the composite material. Compared with the prior art, the process has the advantages that through systematic filler screening, surface modification and dispersion process control, uniform dispersion and firm interface bonding of the filler in an organic silicon matrix are achieved, and therefore the thermal stability of the composite material is remarkably improved.

The invention discloses a TOPCon solar cell and a preparation method thereof, and belongs to the field of solar cells, a laminated structure of a tunneling oxide layer / a first amorphous silicon layer / a first PSG layer / a second amorphous silicon layer / a second PSG layer is formed on the back surface of a silicon wafer, and a first phosphorus-doped polycrystalline silicon layer and a second phosphorus-doped polycrystalline silicon layer are formed after phosphorus diffusion; wherein the phosphorus doping concentration of the first phosphorus-doped polycrystalline silicon layer is lower than that of the second phosphorus-doped polycrystalline silicon layer. The distribution of phosphorus atoms in the doped polycrystalline silicon layer is controlled, so that the phosphorus doping concentration, close to the silicon substrate, of the metal electrode contact area is low, and the passivation performance between the silicon substrate and the tunneling oxide layer is improved in cooperation with the tunneling oxide layer; the doping concentration of phosphorus close to the metal electrode is high, and the contact performance is improved, so that phosphorus atoms entering the silicon substrate are reduced, and the temperature window of phosphorus diffusion is increased.

The invention belongs to the technical field of pouring sealants, and particularly discloses a high-thermal-conductivity two-component flame-retardant pouring sealant and a preparation method thereof.The two-component pouring sealant comprises a component A and a component B. The two-component pouring sealant is characterized in that a novel multifunctional composite filler is adopted, aluminum nitride serves as a core of the filler, and the surface of the filler is coated with a zinc oxide shell layer through a hydrothermal method; a core-shell structure is formed, and phosphorus-nitrogen synergistic effect is further grafted on the surface of a shell layer through silane coupling reaction. The composite filler is combined with an organic silicon matrix through chemical bonding, and an efficient heat-conducting network and an intrinsic flame-retardant barrier are constructed in a system. According to the pouring sealant disclosed by the invention, the heat conductivity coefficient is greater than or equal to 3.0 W / (m.K) and the flame retardant property of UL94 V-0 level is realized while the excellent flowability is maintained, and the filler is good in settling resistance and excellent in comprehensive performance, so that the pouring sealant is particularly suitable for pouring protection of high-power-density electronic components.

The invention relates to the technical field of metal alloys, in particular to a bonding aluminum wire for integrated circuit packaging and a preparation method of the bonding aluminum wire, the bonding aluminum wire is composed of a composite aluminum alloy, zirconium, lanthanum, ytterbium, gallium and copper are compositely added into an aluminum-silicon matrix of the alloy, and by means of the chemical component design, the bonding aluminum wire can be prepared into an aluminum-silicon composite material. A double-region synergistic microstructure is constructed in the alloy, that is, zirconium trialuminide nanophase coherent with an aluminum matrix is dispersed and distributed in crystal grains, and meanwhile segregation of solute atoms such as lanthanum and ytterbium is achieved at the crystal boundary. The problem of high-temperature softening of a traditional aluminum wire is solved, the high-temperature strength and the fatigue resistance are improved on the premise of not sacrificing the excellent conductivity of the material, the alloy has the self-repairing and self-healing capacity under bonding damage and extreme thermal shock, and the service reliability of the whole life cycle of the alloy is enhanced.