824results about How to "Evenly doped" patented technology

A semiconductor structure includes of a plurality of semiconductor fins overlying an insulator layer, a gate dielectric overlying a portion of said semiconductor fin, and a gate electrode overlying the gate dielectric. Each of the semiconductor fins has a top surface, a first sidewall surface, and a second sidewall surface. Dopant ions are implanted at a first angle (e.g., greater than about 7°) with respect to the normal of the top surface of the semiconductor fin to dope the first sidewall surface and the top surface. Further dopant ions are implanted with respect to the normal of the top surface of the semiconductor fin to dope the second sidewall surface and the top surface.

A photoelectric conversion device including a plurality of pin junction layers, wherein at least a p-layer adjacent to an n-layer is formed of a stack of an amorphous silicon layer as a first p-layer and an amorphous silicon layer as a second p-layer, the first p-layer having a thickness of 5 nm or less and containing a p-type impurity and an n-type impurity, and the second p-layer having a p-type impurity concentration gradually decreasing as it is closer to an i-layer.

The invention relates to the technical field of zinc oxide preparation, and in particular relates to a preparation method of a nitrogen-doped zinc oxide film. The preparation method comprises: placing a silicon substrate in the reaction cavity of atomic layer deposition (ALD) equipment; introducing gas containing a zinc source into the reaction cavity of the ALD equipment, wherein the zinc atoms in the gas containing the zinc source are adsorbed to the silicon substrate; conveying hydrogen to the reaction cavity of the ALD equipment based on nitrogen as a carrier gas, and simultaneously carrying out plasma discharge; introducing an oxygen-containing source to the reaction cavity of the ALD equipment, wherein the zinc atoms which do not react with nitrogen atoms form zinc-oxygen bonds withthe oxygen atoms in the oxygen-containing source; and repeating the steps, so as to grow the zinc oxide film containing the nitrogen atoms layer by layer. In the preparation method provided by the invention, nitrogen doping is carried out on the zinc oxide film by utilizing the ALD equipment; the method is simple and practicable; by utilizing the characteristic of atomic layer deposition and single-layer cycle growth, the uniform nitrogen doping in the whole film structure can be achieved in the process of zinc oxide film growth so that the doped film is complete in structure and excellent inproperty.

The invention relates to a method for the spray drying of spherical doped lithium maganate slurry. The method comprises: mixing manganese dioxide, lithium carbonate, doped metal salt and a solution containing a dispersant according to a certain proportion; subjecting the mixture to mechanical mixing to obtain a uniformly mixed slurry; subjecting the uniformly mixed slurry to spray drying to obtain a spherical precursor; and roasting the precursor sectionally to obtain a spherical doped lithium manganate slurry cathode material product. The lithium manganate cathode material for lithium ion batteries has uniform granularity which averagely is 15mu m, uniform spherical shape and good cycle performance. The invention is simple in process, convenient in operation, environmentally friendly and applicable to industrial production.

The invention provides a large-mode-area active optical fiber, which comprises a fiber core, a first cladding, a second cladding and a third cladding, wherein the first cladding, the second cladding and the third cladding sequentially encircle the periphery of the fiber core; the effective refractive index of the second cladding is lower than the effective refractive indexes of the first claddingand the fiber core; a pump core area encircles the outer side of the third cladding; an external cladding encircles the outer side of the pump core area and comprises a layer of air vent holes or capillary bars doped with quartz glass; and the effective refractive index of the external cladding is lower than that of the pump core area. On the premise of ensuring a large mode area of the active optical fiber, the optical fiber suppresses amplified spontaneous radiation, improves the stability of the optical fiber, and ensures the quality of light beam. The invention also provides a preparationmethod of the active optical fiber. By adopting a liquid phase multi-point doping mode of gas-phase aluminum doping and rare-earth ions, continuous doping for many times can be flexibly controlled and realized, the size of a rare-earth doped core bar is greatly increased, and uniform doping of the rare-earth ions and aluminum is simultaneously realized.

The invention relates to a preparation method of a single crystal lithium ion battery nickel cobalt lithium manganate cathode material. The method comprises the following steps of: (1) taking a small-grain crystal spherical NCM ternary precursor, a lithium salt and an A element-containing nano fluxing agent as raw materials, uniformly mixing the raw materials by adopting a dry-method high-speed mixing mode, and performing primary sintering under an oxygen-enriched atmosphere condition; (2) subjecting the sintered material to jaw breaking, roller pairing, crushing and sieving so as to obtain asingle-crystal once-sintered base material; and (3) mixing the primary sintering base material with a B element-containing nano coating agent, sintering again under an oxygen-enriched atmosphere condition, and then performing jaw breaking, roller pairing, crushing and sieving to obtain the large single crystal lithium nickel cobalt manganate cathode material. The cathode material prepared by the invention has the characteristics of the large particle size, the good dispersity, the moderate specific surface area, the high compaction density, the high voltage, the good high-temperature cycle performance and the like.

An inline mixing device (53) is constituted of a sulzer mixer (160) disposed in an upper stream and a static mixer (170) disposed in a downstream. An additive supplied through an orifice (150a) passes through the sulzer mixer (160) disposed in the upstream. As the sulzer mixer (160) is superior in dividing the flow, the additive is uniformly dispersed in a dope pipe (152). Thereafter, the additive passes through the static mixer (170). As the static mixer (170) is superior in reversing the flow, the additive and the primary dope are further stirred and kneaded. The inline mixing device (53) uses the two different kinds of mixers for effectively mixing the additive and the dope while taking advantages of each mixer.

The invention discloses a preparation method of doped zinc oxide nano powder, which comprises the following steps that: doped metal salt and zinc salt are dissolved in water to form salt solution; under intense stirring, the salt solution is uniformly dripped into precipitant solution, the pH value of a mixed system is kept to be 5 to 10 and the temperature is kept to be 10 to 80DEG C during the dripping process to obtain a coprecipitation product; after the coprecipitation product is aged for 10 to 30h, precipitate is sequentially washed by deionzied water and absolute ethyl alcohol and is dried to obtain a white product; and the white product is calcined for 1 to 5h at 400 to 800DEG C to prepare the doped zinc oxide nano powder. The method has the advantages of low cost, simple used equipment and easy large-scale industrial production, and the prepared doped zinc oxide nano powder has the advantages of uniform distribution, high purity and no non-conductive second phase, and can be used for preparing high-quality zinc oxide-based sputtering targets.

The invention discloses a nano-composite positive material LiFePO4/C and a fabrication method, relating to a fabrication method of positive material of a lithium-ion battery. The invention uses the method of liquid-phase coprecipitation, the certain amount of lithium resource, iron resource and phosphate resource is weighted as the quality mol ratio of Li:Fe:P = (3.0-3.3):(1.0-1.1):(1.0-1.1), and the appropriate amount of carbon-doped material and organic surfactant is added in the reaction vessel; by controlling the reaction conditions like concentration, temperature etc. of the reaction solution, precursor gels are fabricated, and the precursor gels are separated, cleaned, filtered and dried to obtain precursor powder; the precursor powder is tableted and put into the crucible with microwave absorbent, and then the crucible is placed in the microwave oven, with the microwave power controlled between 100 to 600W and heated for 30 min, to obtain nano-sized composite positive material LiFePO4/C. The technique method in the invention has the advantages of short periods, saved energy consumption, ease to control the process, suitability for industrialization and so on. The composite positive material LiFePO4/C fabricated in the invention is characterized by high purity, small particle size lower than 100 nm, and good electrochemical properties.

The invention provides a method for preparing fluorinated graphene through a microwave hydrothermal method. The fluorinated graphene is prepared by employing the microwave hydrothermal method and is rapidly heated by utilizing the change of the electric field and magnetic field in the space, the low-temperature (150-200 DEG C) temperature is realized, the reaction time (30-60 minutes) is greatly shortened, the energy consumption is reduced, and the preparation efficiency is improved. The adopted preparation method does not have temperature gradient in the reaction process, a hysteresis effect is avoided, and the reaction process is easy to control and fewer in influence factors; and the prepared fluorinated graphene is uniform in fluorine doping and high in experimental repeatability. The process conditions such as raw material ratio, reaction temperature and reaction time are adjusted, and the fluorinated graphene of different fluorine contents can be prepared. The prepared fluorinated graphene is high in yield, and the yield is up to 90-95 percent. The preparation method is easily popularized and applied.

The invention provides a sol-solvent thermal method for synthesizing a nanocrystalline oxide powder. The method comprises the following: (1) a step of preparation of inorganic salt mother liquids, during which the inorganic salt taken as a material is dissolved in an organic liquid medium or water to prepare a mother liquid of the inorganic salt with definite concentration; (2) a step of preparation of a precipitation reactant liquid, during which alkali is dissolved in an organic liquid medium or water, proper quantity of surfactants are added to prepare the precipitation reactant liquid with definite concentration; (3) a step of preparation of sols, during which, at a certain temperature, while stirring, the prepared reactant liquid is slowly added in the prepared mother liquid of the inorganic salt, the reactant liquid and the mother liquid of the inorganic salt are kept reacting for a period of time after adding the reactant liquids in the mother liquid of the inorganic salt, and the transparent sols are obtained; and (4) a step of solvent thermal reaction of the sols, during which the prepared sols are put in a reaction kettle and reacted for a period of time under a certain temperature and pressure, the products obtained are subjected to filtering, washing and drying, and the nanocrystalline oxide powder is obtained.

The invention discloses a preparation method for doped graphene foams. The preparation method comprises the following steps: adopting the hydrothermal method to enable nano particles to dope with and generate on oxidized graphene sheets to obtain oxidized graphene aerogel; reducing the oxidized graphene aerogel doped with the nano particles in a controllable manner at the low-temperature gaseous phase condition to obtain the doped graphene foams. According to the preparation method, a reductant is not used in the growing process of the nano particles, and liquid is not introduced into the reaction system, so that excessive overlap of the graphene layers is avoided, porosity of the graphene foams is maintained, polyporous shrinkage caused by surface stress is prevented, and the uniformly doped graphene foam material with the controllable appearance is obtained. The preparation method is convenient to operate, uniform in doping, controllable in product size, economical and fast, is adopted as the novel technology for the large-scale preparation of the doped graphene foam material, and is expected to provide novel materials for graphene adsorbents, graphene capacitors, graphene catalysts and the like.

The invention provides an anion-cation co-doped modified lithium-rich manganese composite positive electrode material and a preparation method thereof. The method comprises the steps that a nickel-cobalt-manganese oxide precursor, a doping agent and a lithium source are magnetically stirred and mixed in a solvent, dried and calcined, and the anion-cation co-doped modified lithium-rich manganese composite positive electrode material is obtained; the doping agent is a cationic salt and an anionic salt; the cationic salt is selected from one or more of sodium salt, potassium salt, rubidium salt and cesium salt; and the anionic salt is selected from one or more of villiaumite, chlorine salt, sulfur salt and phosphorus salt. By adopting a magnetic stirring mode, the morphology of the precursorcan be kept to the greatest extent; the modified lithium-rich manganese composite positive electrode material with controllable precursor morphology is obtained, the doping agent can be dissolved in the solvent, uniform doping is realized, and the purposes of structure regulation and control and co-doping double modification are achieved, so that the specific discharge capacity, the rate capability and the cycling stability of the composite positive electrode material are improved.

A method of manufacturing a composite tungsten oxide nanoparticles, and infrared-shielding infrared absorbing material body, the use of the infrared-absorbing material comprises a composite tungsten oxide nanoparticles are manufactured by sol-gel method, the manufacturing method for the first reaction in the sol-gel process the proportion of the desired composite element directly added to the solution and allowed rapid precipitation, drying and then heat-treated after special atmosphere to obtain a composite tungsten oxide nanoparticle material, or the general formula M1xM2yWO M1xM2yWORz or M1xWORySz, wherein M1 is IA - Group IIIA or a transition metal element, M2 of Group IA - IIIA or a transition metal elements, W is tungsten, O is oxygen, R, S of IVA - VIIA elements, specifically, R, S may be in sol-gel when you import or atmosphere heat treatment during synthesis. This material is used in the field of infrared-absorbing material, and thus the production method can improve the tungsten oxide nanoparticles molecular absorption wavelength greater than 1200nm infrared.

The invention discloses a method for preparing a zinc oxide-based sputtering target material. The method comprises the following steps of: performing die pressing on doped zinc oxide nano-powder at the pressure of between 30 and 150 MPa and maintaining the pressure for 30 to 300 seconds; performing isostatic cool pressing on the doped zinc oxide nano-powder at the pressure of between 120 and 300 MPa and maintaining the pressure for 60 to 600 seconds; heating the doped zinc oxide nano-powder to the temperature of between 950 and 1,300 DEG C at a heating rate of between 5 and 10 DEG C per minute, and maintaining the temperature for 1 to 30 minutes; cooling the doped zinc oxide nano-powder to the temperature of between 650 and 1,100 DEG C at a cooling rate of between 10 and 100 DEG C per minute and maintaining the temperature for 2 to 40 hours; and finally, cooling the doped zinc oxide nano-powder to the room temperature at a cooling rate of between 0.5 and 10 DEG C per minute, and performing cutting and polishing on the doped zinc oxide nano-powder to obtain the zinc oxide-based sputtering target material. By adopting specific two-step sintering parameters, the method is used for preparing the target material of which the density is over 98 percent, the grain size is very small and uniform and is between 0.5 and 20 mu m, and the doped components are uniform at a low sintering temperature.

The invention provides a preparation method of nitrogen-doped graphene by a chemical vapor deposition method, which comprises the following steps of: providing a substrate with high temperature resistance, and a solid and/or liquid organic carbon source compound; preparing the organic carbon source compound into solution or suspension; coating the solution or suspension of the organic carbon source compound on the surface of the substrate; heating the substrate coated by solution or suspension containing the organic carbon source compound to 500-1300 DEG C under an oxygen-free and vacuum environment, then leading into gaseous nitrogen compound to react to obtain nitrogen-doped graphene. The preparation method of nitrogen-doped graphene provided by the invention prepares the solid and/or liquid organic carbon source compound into solution or suspension and coats directly on the surface of the substrate to make the organic carbon source compound react with the introduced nitrogen compound. The method provided by the invention has the advantages of having no need of adding a catalyst, simplifying the production process of nitrogen-doped graphene effectively and reducing the production cost. At the same time, the nitrogen-doped graphene prepared by the chemical vapor deposition method enables the doped graphene to be controlled easily in the amount, to be doped uniformly and to be high in electrochemical stability.

The invention provides a composite material as well as a preparation method and an application thereof. The preparation method of the composite material comprises the following steps: carrying out self-assembly reaction on a polymer with charges and micron or nano-scale doped material particles with surface charges in a solvent to generate a colloid, and removing the solvent from the colloid to obtain the composite material. The invention further provides a medicine carrying system which takes the composite material as a carrier. The composite material prepared from micron or nano-scale doped material particles which can be dispersed uniformly by coating the solvent with the colloid has a micron or nano-scale uniform and repetitive structure. Because the micron or nano-scale doped material particles for preparing the composite material are doped uniformly, and the polymer highly coats the micron or nano-scale doped material particles, the composite material has strong mechanical performance. The medicine carrying system with a micron or nano-scale structure can ensure that the medicines carried by the composite material are distributed uniformly. Because the polymer highly coats the micron or nano-scale doped material particles, the medicine carrying system has a better medicine slow-release effect than the traditional medicine carrying systems and can release the medicines more uniformly in a three-dimensional space than the traditional medicine carrying systems.

The invention discloses a method for preparing palladium and/or antimony-doping tin oxide nano-powder. The method mainly comprises the following steps of: mixing raw materials according to the molar doping ratio of Pd<2+> and/or Sb<3+> to Sn<2+> of 0.5 to 3.5 and dropwise adding at least one of the solution of PdCl2 and the suspension of SbCl3 into the solution of tin salt with stirring to form mixed solution, wherein the raw materials comprise 0.2 to 1 mol/L solution of tin salt, 0.1 to 0.5 mol/L solution of palladium chloride (PbCl2), 0.1 to 0.5 mol/L suspension of antimony chloride (SbCl3)and 0.4 to 1 mol/L solution of alkali source; adding the solution of alkali source dropwise into the mixed solution with stirring until the pH value is between 9 and 13; stirring the solution to formprecursor suspension with a large amount of precipitate; transferring the precursor suspension to a high-pressure reactor to perform reaction for 12 to 36 hours at the temperature of between 100 and 200 DEG C and naturally cooling to room temperature to obtain a hydrothermal product; washing the hydrothermal product for multiple times by using deionized water and ethanol and detecting the productby using silver nitrate until the Cl<-> is removed completely; and drying at the temperature of between 70 and 100 DEG C to obtain the palladium and/or antimony-doping tin oxide nano-powder. The method has the advantages of simple process, environmental friendliness and suitability for industrialized production.

The invention provides a Bi0.92-xHo0.08AExFe0.97Mn0.03O3-Zn1-yNiyFe2O4 ferromagnetic composite film and a preparation method thereof. The ferromagnetic composite film comprises a Bi0.92-xHo0.08AExFe0.97Mn0.03O3 crystalline film and a Zn1-yNiyFe2O4 crystalline film, which are compounded together. The preparation method is as below: first respectively preparing a Zn1-yNiyFe2O4 precursor solution and a Bi0.92-xHo0.08AExFe0.97Mn0.03O3 precursor solution, wherein AE is Sr, Ca, Ba or Pb, x equals to 0.01-0.04, and y equals to 0.1-0.9; preparing a plurality of Zn1-yNiyFe2O4 films on a substrate by spin coating; and then preparing plurality of Bi0.92-xHo0.08AExFe0.97Mn0.03O3 films on the Zn1-yNiyFe2O4 films by spin coating, so as to obtain the ferromagnetic composite film. The method regulates the crystal structure of BiFeO3 by doping, and uses ferromagnetic Zn1-yNiyFe2O4 as the magnetic layer, so as to substantially increase the ferroelectric and ferromagnetic properties of the film, and effectively reduce the leakage current density of the film.

The invention discloses a preparation method of a Yb3+ doped silica fiber preform mandrel. The preparation method comprises the steps that silicon oxide powder doped with rare earth and co-doping agent Al, P and the like is prepared; decarbonization, dehydroxylation and ball-milling treatment are carried out; high-temperature purification is carried out; the purified powder biscuit is smelted at a high temperature to form glass, and the glass is prepared into the mandrel. The Yb3+ doped silica fiber preform mandrel with the diameter range of 3-18 mm and the length range of 50-300 mm can be prepared, the doping evenness of the mandrel is quite good, and the refractive index fluctuation of the mandrel delta n is smaller than 2*10<-4>. Correspondingly, the mandrel and a pure silica glass sleeving bar are adopted, the preform is prepared through a pipe-bar method, after optical fiber is formed through drawing, the refractive index evenness delta n of the optical fiber exceeds the detection limit of an instrument, and the back bottom loss of the optical fiber at the 1200 nm position is lowered from 0.5-1 dB to 0.05 dB/m and reaches the loss level of MCVD technology.