237results about How to "Reduce interface defects" patented technology

The invention discloses a multi-scale reinforcement body that carbon nano-tube is connected with carbon fiber and a preparation method aiming at solving the drawbacks of increasing rigidity at the interface, lowering toughness of material and not improving performance of resin base between the fibers and between carbon fiber plywoods after prior carbon fiber treatment is made. The multi-scale reinforcement body of carbon nano-tube connecting carbon fiber is made through combining between a carbon nano-tube decorated by 1, 6 hexamethylenediamine and carbon fiber with acyl chloride functional group on the surface. The preparation method comprises: the carbon nano-tube decorated by 1, 6 hexamethylenediamine and the carbon fiber with acyl chloride functional group on the surface are prepared before put into N,N-dimethylformamide for reaction, thereby getting the multi-scale reinforcement body of carbon nano-tube connecting carbon fiber. The invention has the advantages of big activity on the surface, a plurality of chemical activated functional groups, strong reactive activity, good cohesiveness with the base, improving shearing intensity at the interface for composite material by 127.5% to 144.7% and improving toughness for the base by 34.43% to 48.67%.

The invention discloses a method for preparing a ZnO/Cu2O heterojunction material and a ZnO/Cu2O three-dimensional structure heterojunction solar cell. The preparation method of the heterojunction material includes growing an n-type ZnO nanorod array on a substrate by a liquid phase growth method Thin film, with alkaline copper salt solution as the electrolyte, deposited at a deposition potential of -0.4~-0.6V for 60-150s, and electrochemically deposited p-type Cu2O on the surface of ZnO nanorods to form a Cu2O seed layer; with alkaline copper The salt solution is the deposition solution. Under the deposition potential of -0.05 ~ -0.3V, the Cu2O is fully filled into the gaps of the nanorod array from bottom to top by the electrochemical deposition method again to form a ZnO/Cu2O three-dimensional structure heterojunction material. The filling depth and density of the Cu2O semiconductor thin film of the invention are increased, interface defects are reduced, and the efficiency of the prepared heterojunction battery is high.

The invention relates to high-strength lightweight aggregate concrete and a preparation method thereof, and belongs to the technical field of building material concrete. The lightweight aggregate concrete is prepared from the following raw materials in parts by weight: 105-118 parts of cement, 180-185 parts of light coarse aggregate, 120-125 parts of fine aggregate, 65-70 parts of mineral admixtures, 9-24 parts of modified polypropylene fiber, 3.4-3.8 parts of concrete admixtures and 65-70 parts of water. The preparation method comprises the following steps that the raw materials are weighed according to the formula ratio, the light coarse aggregate is added into water accounting for one half of the total water amount for pre-wetting for 45-60 minutes, then the fine aggregate is added, stirring is carried out for 1-2 minutes, the cement, the mineral admixtures and the modified polypropylene fiber are continuously added, uniform stirring is carried out, then the concrete admixtures andthe rest water are added, and uniform stirring is carried out so as to obtain the high-strength lightweight aggregate concrete. The high-strength lightweight aggregate concrete and the preparation method thereof have the advantages that the strength is high, and the quality is stable.

The invention relates to a low-attenuation bending insensitive single mode fiber which comprises a core layer and wrapping layers. The low-attenuation bending insensitive single mode fiber is characterized in that the relative refractive index difference delta1 of the core layer ranges from 0.30% to 0.38%, the radius R1 of the core layer ranges from 3.5 micrometers to 4.5 micrometers, the four wrapping layers are arranged outside the core layer, the first wrapping layer is a first inner wrapping layer tightly surrounding the core layer, the relative refractive index difference delta2 of the first wrapping layer ranges from -0.02% to 0.02%, the radius R2 of the first wrapping layer ranges from 6.5 micrometers to 8.5 micrometers, the second wrapping layer is a second inner wrapping layer tightly surrounding the first inner wrapping layer, the relative refractive index difference delta3 of the second wrapping layer ranges from -0.02% to 0.02%, the radius R3 of the second wrapping layer ranges from 8 micrometers to 11 micrometers, the third wrapping layer is a downwards-concave wrapping layer tightly surrounding the second inner wrapping layer, the relative refractive index difference delta4 of the third wrapping layer ranges from -0.5% to -0.2%, the radius R4 of the third wrapping layer ranges from 12 micrometers to 20 micrometers, and the fourth wrapping layer is an outer wrapping layer tightly surrounding the downwards-concave wrapping layer and is a pure quartz glass layer. The low-attenuation bending insensitive single mode fiber can be completely matched with a G.652.D optical fiber, and therefore the low attenuation, the large effective area and the bending resistance can be better unified.

The invention relates to a method for preparing an organic-inorganic hybrid evaporation alcohol permselective membrane used for the separation of alcohol/water system. Micropore molecular sieves are modified chemically, organic functional groups are led in the structure and the modified micropore molecular sieves and silicone rubber are mixed and coated to prepare the organic-inorganic hybrid evaporation alcohol permselective membrane. The method is characterized in that: the organic functional groups in the modified micropore molecular sieves can enhance the interaction force between the modified micropore molecular sieves and the silicone rubber, or form stable compound bond phase between the two substances, thus weakening the boundary defect between the inorganic and organic phases, improving the separation performance of the membrane and avoiding the defects of the deterioration of boundary defect between the inorganic and organic phases and unstability of the membrane due to compression during the use process of the membrane.

The invention provides an epitaxial growth method of a purple-light LED. The suitable wavelength range of the method is 365-420 nm, the growth difficulty of the purple-light LED can be greatly lowered, meanwhile, the radiation power of the purple-light LED can be increased and the reliability of purple-light LED devices is effectively improved. In the epitaxial growth method, an n-type AlGaN/GaN super lattice structure is adopted, potential-barrier-layer AlGaN and potential-well-layer GaN are doped alternately periodically, and therefore concentration of n-type carriers can be concentrated; the concentration of different layers change periodically, and periodic conductance changes enable currents to be diffused better; meanwhile, the conductance changing area is widened, so that the transmitting effect of an electric leakage channel with linear defects is weakened, forward voltage can be lowered, and ESD can be improved.

The invention discloses a preparation method of an acrylic polymer grafted carbon fiber multi-scale reinforcement, relating to a carbon fiber reinforcement and a preparation method thereof. The preparation method comprises the following steps of: 1) performing oxidation treatment on a carbon fiber surface; 2) grafting a silane coupling agent to the carbon fiber surface after the oxidation treatment; 3) obtaining chain transfer agent grafted carbon fiber through a reaction between the carbon fiber surface grafted silane coupling agent and a chain transfer agent; and 4) initiating acrylic monomer grafting polymerization on the surface of the chain transfer agent grafted carbon fiber to finally obtain an acrylic polymer grafted carbon fiber multi-scale reinforcement. The method disclosed by the invention has the advantages that the roughness of the carbon fiber surface can be greatly improved, a great quantity of active functional groups can be introduced, the reaction activity of the carbon fiber surface is improved, the wettability and cohesiveness between the carbon fiber and a resin matrix are improved, and the interlaminar shear strength of an epoxy composite material is enhanced by 40-50%.

The invention discloses a semiconductor structure and a forming method thereof. The forming method of the semiconductor structure comprises the steps as follows: a semiconductor substrate is provided; a gate structure which covers partial surface of the semiconductor substrate is formed; a source and a drain are respectively formed in the semiconductor substrate at two sides of the gate structure; a dielectric layer is formed on the semiconductor substrate; the surface of the dielectric layer is higher than the top surface of the gate structure; a through hole is formed in the dielectric layer and exposes the surfaces of the source and the drain; an oxidation layer is formed on the surfaces of the source and the drain at the bottom of the through hole; a metal material layer is formed on the surface of the oxidation layer; an annealing treatment is carried out; the metal material layer reacts with the oxidation layer to form a metal oxide layer and a metal semiconductor compound layer; and the metal semiconductor compound layer is located on the surface of the metal oxide layer. The contact resistance between the source and the drain of the semiconductor structure formed by the method and the metal semiconductor compound layer is relatively small.

The invention belongs to the fields of thin film material and device, and in particular relates to a perovskite photovoltaic cell and a preparation method of the planar structure perovskite photovoltaic cell. The perovskite photovoltaic cell comprises a transparent conductive substrate, a CrOx thin film anode interface layer, a perovskite photosensitive active layer, a cathode interface layer and a metal electrode, wherein the CrOx thin film is prepared by the solution method comprising following steps: with chromium acetylacetonate as solute and chlorobenzene as solvent, preparing a chromium acetylacetonate solution, preparing a chromium acetylacetonate thin film on a substrate by a spin-coating method and annealing at low temperature; enabling the low-temperature annealed chromium acetylacetonate thin film to be subjected to high-temperature thermal annealing treatment or ultraviolet ozone treatment to obtain the CrOx thin film after the chromium acetylacetonate thin film is oxidized. The CrOx thin film disclosed in the invention is prepared by the solution method, and has small interface defect and good thermal stability, and the perovskite photovoltaic cell with the thin film has excellent photoelectric property; the preparation method is simple, and the preparation cost of the cell can be reduced greatly.

The present invention provides an organic insulating layer-based gradient-doped IGZO thin-film transistor and relates to the technical field of electronics. The organic insulating layer-based gradient-doped IGZO thin-film transistor comprises a substrate, a gate electrode, an organic insulating layer and a gradient-doped IGZO semiconductor layer, wherein the substrate, the gate electrode, the organic insulating layer and the gradient-doped IGZO semiconductor layer are sequentially arranged from bottom to top. On the gradient-doped IGZO semiconductor layer, a source electrode and a drain electrode are arranged in parallel. The gradient-doped IGZO semiconductor layer comprises a lowermost IGZO thin-film layer, an uppermost IGZO thin-film layer, and an intermediate IGZO thin-film layer, wherein the concentrations of the lowermost IGZO thin-film layer, the uppermost IGZO thin-film layer, and the intermediate IGZO thin-film layer are sequentially increased. According to the technical scheme of the invention, the problem that the IGZO semiconductor and the organic insulating layer are not matched in lattice so as to cause the damage of the subsequent DC magnetron sputtering to the organic insulating layer and the formation of a large leakage current can be solved.

The invention provides a manufacturing method of a thin film transistor. The thin film transistor is of a bottom grid structure and comprises a grid electrode, three insulating layers, an IGZO active layer, a SiO2 protection layer, a source electrode and a drain electrode, wherein the bottom is a glass substrate, the grid electrode ITO is deposited on the upper portion center area of the substrate with a magnetron sputtering method, the three insulating layers cover the grid electrode, the HfO2 insulating layer is in the middle, the Al2O3 insulating layers are on the two sides, a sandwich structure is formed by the HfO2 insulating layer and the Al2O3 insulating layers, Al2O3 and HfO2 are respectively prepared with the DC magnetron sputtering method and the sol gel method, the IGZO active layer and the SiO2 protection layer are sequentially arranged on the upper portion of the insulating layers, and the two ends of the source electrode and the two ends of the drain electrode are respectively located on the protection layer and the active layer.

The invention relates to a polycrystalline-ferroelectric-film-based ferroelectric resistive random access memory. Defect regulation and control layers are contained between a lower electrode layer and a polycrystalline ferroelectric film layer and/or between the polycrystalline ferroelectric film layer and an upper electrode layer. The relative dielectric constant of material of the defect regulation and control layers is no smaller than 5 and no larger than the relative dielectric constant of ferroelectric material, the thickness of each defect regulation and control layer ranges from 1 nm to 20 nm, and the ratio of the thickness of each defect regulation and control layer to the thickness of the polycrystalline ferroelectric film layer ranges from 0.001 to 0.2. The energy band gap of the material of the defect regulation and control layers is larger than 3eV, and the lattice mismatch of the material of the defect regulation and control layers with the polycrystalline ferroelectric film is smaller than 0.1. Because the defect regulation and control layers are implanted between the lower electrode layer and the polycrystalline ferroelectric film layer and/or between the polycrystalline ferroelectric film layer and the upper electrode layer, defects in the memory unit and the control difficulty of the defects are reduced, unfavorable influences of the defects on the resistance random access behavior are reduced, and thus the data retentivity and the anti-fatigue property of the memory are remarkably improved, the high-low resistance ratio of the memory is remarkably increased, and data volatility is reduced.

The present invention discloses a carbon nano-tube film composite material preparation method, which comprises: preparing a substrate; preparing a carbon nano-tube film; etching the carbon nano-tube film; placing the etched carbon nano-tube film on at least a surface of the substrate to form a carbon nano-tube structure so as to form a carbon nano-tube film composite material preform; and heating the carbon nano-tube film composite material preform to make the carbon nano-tube film structure and the substrate be compounded so as to obtain the carbon nano-tube film composite material. Compared with the method in the prior art, the method of the present invention has the following characteristics that: the carbon nano-tube film is etched before the carbon nano-tube film and the substrate are compounded to obtain the carbon nano-tube film with the partial thinned area or penetrating carbon nano-tube film so as to improve the interface performance of the carbon nano-tube composite material and reduce the interface defects, the obtained carbon nano-tube film composite material exhibits the excellent comprehensive performance and shows the application potential in a plurality of future fields.

The invention provides equipment for preparing a gate dielectric layer. The equipment comprises a thermal treatment process cavity used for growing a SiO2 gate dielectric layer, a plasma nitriding process cavity used for performing plasma nitrogen injection on the gate dielectric layer to form a Si-N bond, a high-temperature nitriding cavity used for repairing lattice damage in the gate dielectric layer and stabilizing the Si-N bond, a low-temperature oxidizing cavity used for repairing a gate dielectric layer/channel interface, a control unit used for controlling conversion of a semiconductor substrate among all the process cavities and opening/closing of all the process cavities, and a conveying device used for conveying the semiconductor substrate among all the process cavities. By adopting a process for preparing the gate dielectric layer in the equipment provided by the invention, the Si-N bond tends to be stable to prevent the volatilization of N atoms, the N concentration in a SiON gate dielectric is stabilized, the dielectric constant of the SiON gate dielectric is increased, reduction of a carrier mobility caused by interface defect is avoided, and the interface quality and the performance of a device are improved.

The invention provides a method for etching SiC through a metal/oxide double-layer mask structure, and the method at least comprises the steps: 1), providing an SiC epitaxial wafer, and growing an oxide mask layer on the surface of the SiC epitaxial wafer; 2), forming a photoresist layer on the surface of the oxide mask layer of a to-be-etched region of the SiC epitaxial wafer; 3), forming metal mask layers on the oxide mask layer and the surface of the photoresist layer; 4), removing the photoresist layer and the metal mask layer on the surface of the photoresist layer, and forming an etching window; 5), etching the oxide mask layer and the SiC epitaxial wafer to a needed depth through the etching window; 6), removing the residual metal mask layer and oxide mask layer, and obtaining an SiC gate groove structure. According to the invention, the oxide mask layer is taken as a blocking layer, thereby preventing the metal elements from diffusing towards the SiC epitaxial wafer and the substrate, and solving a problem of element pollution. In addition, the method can obtain a high-etching-rate gate and high-anisotropism groove structure with the smooth etching surface.

The invention discloses a heat-conduction binding material. The heat-conduction binding material is formed by mixing components A and components B, wherein the components A include 100 parts of epoxy resin, 20-30 parts of reactive diluent, 30-50 parts of modified inorganic heat-conduction materials and 10-15 parts of organic solvent according to mass ratio and the modified inorganic heat-conduction materials are formed by coupling agents adsorbing on surfaces of inorganic heat-conduction particles. The components B include curing agents and organic solvents. The coupling agents are adsorbed on the inorganic heat-conduction particles to form the modified inorganic heat-conduction materials, so that compatibility of the inorganic particles in the organic resin can be improved, boundary defects and boundary stress between inorganic materials and organic materials after curing are reduced, organic layers among the inorganic heat-conduction particles can be reserved on the condition of adding a great quantity of modified inorganic heat-conduction materials, binding force of the heat-conduction binding material is improved, and accordingly, the heat-conduction binding material is better in mechanical performance. The invention further provides a preparation method of the heat-conduction binding material.

The invention provides a method for forming a semiconductor structure, comprising the following steps of: providing a substrate, wherein the substrate is provided with a grid structure, a source region and a drain region positioned in the substrate at the two sides of the grid structure; forming metal layers on the surfaces of the source region and the drain region; and carrying out annealing process on the source region and the drain region forming the metal layers on the surfaces, and forming metal silicide in the source region and the drain region, wherein annealing gas at least comprises one or combination of hydrogen and deuterium. According to the method, by adding one or combination of the hydrogen and the deuterium into the annealing gas, silicon dangling bonds in the substrate are bonded with one or combination of the hydrogen and the deuterium, the silicon dangling bonds in the substrate are reduced, the interface defects nearby the substrate are reduced, and silicon-hydrogen bonds and silicon-deuterium bonds are stronger respectively, the cracking probability of the silicon-hydrogen bonds and the silicon-deuterium bonds is reduced under the external stress of the process environment, the interface defects nearby the substrate are further reduced, and the hot electron effect is restrained.

The invention discloses a ferro-electric field effect transistor based on a structured carbon nano tube striped array and a manufacturing method of the ferro-electric field effect transistor. According to the unit structure of the transistor, a bottom electrode layer (1) is arranged on the bottom layer, a ferro-electric film insulated gate layer (2) and a structured carbon nano tube striped array channel layer (3) are sequentially arranged on the middle layer, and a top layer is arranged on the structured carbon nano tube striped array channel layer (3) and comprises a transistor source electrode (4) and a transistor drain electrode (5); carbon nano tubes are single-walled carbon nano tubes, or double-walled carbon nano tubes or multi-walled carbon nano tubes. According to the ferro-electric field effect transistor, the on-state current and the switch ratio are large, carrier mobility is high, the starting voltage is small, the storage window is wide, and meanwhile the ferro-electric field effect transistor has the advantages of being simple in structure and a buffering layer is not needed, interface contact between a ferro-electric layer and a semiconductor layer is good, and large-area soft devices are easy to obtain. The manufacturing method is simple in technology, convenient to operate and low in cost and dispense with expensive equipment, and large-area and large-scale industrial production is easy to realize.

The invention relates to a single-mode fiber and a fabrication method thereof. A bare fiber comprises a core layer and a wrapping layer, wherein the core layer comprises a first core layer, a second core layer and an inner wrapping layer, the relative refractivity difference Delta 1 of the first core layer is more than 0.2% but less than 0.35%, the relative refractivity difference Delta 2 of the second core layer is more than or equal to 0.15% but less than or equal to 0.25%, the refractivity radius of the inner wrapping layer is 24-36 micrometers, the relative refractivity difference Delta 3of the inner wrapping layer is more than or equal to -0.12% but less than or equal to 0%, the wrapping layer comprises a sunken wrapping layer and an external wrapping layer, the relative refractivitydifference Delta 4 of the sunken wrapping layer is more than or equal to -0.40% but less than or equal to -0.28%, and the external wrapping layer is a high-hardness pure quartz sleeve. With the adoption of a method for on-line assembly and drawbenching by two sleeves and a core rod, fiber annealing for many times is performed during the drawbenching process, a coating layer with low modulus is coated in a surface of the fiber, a coating layer with high modulus is coated outside the surface of the fiber, and the fiber with low loss, large effective area and high strength is fabricated. The method is simple, the viscosity of the cord rod can be adjusted according to a demand, the fiber attenuation is reduced without employing a pure silicon core scheme, and production on a large scale is facilitated.

The invention discloses a graphene/palladium diselenide/silicon heterojunction self-driven photoelectric detector, which is applied to the technical field of photoelectric detection. In view of the problem that the existing photoelectric detector is limited by weak light absorption performance of graphene and low in responsivity, a technical scheme as follows is adopted: firstly, an n-type siliconwindow is exposed on an n-type silicon dioxide/silicon substrate through dry etching; a gold/indium electrode is plated near the silicon window, a palladium diselenide microchip is prepared by adopting mechanical stripping, and palladium diselenide is transferred to the silicon window by utilizing a positioning dry method; and finally, graphene is transferred in a wet transfer mode and covers thesurfaces of palladium diselenide and the electrode, palladium diselenide serves as an interface modification layer between graphene and silicon, and a graphene/palladium diselenide/silicon heterojunction is formed by the graphene layer, the palladium diselenide layer and the n-type silicon substrate corresponding to the single silicon window. The device provided by the invention is simple in preparation process, has self-driving performance, and has excellent performances such as relatively high responsivity in a visible-near-infrared light band.

The invention discloses a transition metal chalcogenide compound horizontal homogeneous junction solar cell and a preparation method thereof, and belongs to the field of semiconductor materials. The solar cell comprises an insulating substrate, an electrode A, an electrode B, an n-type transition metal chalcogenide compound film and a p-type transition metal chalcogenide compound film; the electrode A and the electrode B are located at the two ends of the insulating substrate respectively; and the n-type transition metal chalcogenide compound film and the p-type transition metal chalcogenide compound film are composed of the same compound, and are transversely connected to form a p-n junction. The method adopts a laser synthesis method to prepare the n-type transition metal chalcogenide compound film, and by virtue of the horizontal homogeneous p-n junction, the lattice mismatch rate of p-n junction is effectively lowered, and the interface defects are reduced; the electrodes are matched with a thin film work function to form high ohmic contact; and the electrodes and the thin films are combined by van der waals force, so that damage of an electrode preparation process to the thinfilms can be effectively avoided, the caused problems of stress, metal diffusion and the like are solved, and the conversion efficiency of the solar cell applying the thin films is improved.