37results about How to "Increase surface concentration" patented technology

A material for chromatographic separations, processes for its preparation, and separation devices containing the chromatographic material. In particular, porous inorganic/organic hybrid monoliths are provided with a decreased concentration of surface organic groups, and have improved pH stability, improved chromatographic separation performance, and improved packed bed stability. These monoliths may be surface modified resulting in higher bonded phase surface concentrations and have enhanced stability at low pH.

The invention discloses a solar cell crystal silicon wafer phosphorus diffusion method. The method comprises the following steps: 1) a to-be-processed crystal silicon wafer is placed in a diffusion furnace, temperature is raised, and nitrogen carrying a phosphorus source, dry oxygen and large nitrogen are introduced, constant-source diffusion is carried out; 2) introduction of the nitrogen carrying the phosphorus source is stopped, temperature is raised, the dry oxygen and the large nitrogen are introduced to perform propelling; 3) the nitrogen carrying the phosphorus source and the dry oxygen are introduced, and low-temperature diffusion is carried out; 4) the introduction of the nitrogen carrying the phosphorus source is stopped, and constant-temperature propelling is carried out; 5) temperature is raised, the nitrogen carrying the phosphorus source and the dry oxygen are introduced, and constant-source diffusion is carried out; 6) the introduction of the nitrogen carrying the phosphorus source is stopped, and oxygen-existing limited-source diffusion is performed; 7) temperature is lowered, the nitrogen carrying the phosphorus source, the dry oxygen and the large nitrogen are introduced, and cooling diffusion is carried out; and 8) temperature is lowered, and the crystal silicon wafer is taken out from a boat. The phosphorus diffusion method is simple and is easy to do, and the phosphorus diffusion method is widely used; and photoelectric conversion efficiency of the silicon wafer can be effectively improved through adoption of the method, electric performance of a solar cell is improved, and the phosphorus diffusion method is suitable for promotion and application.

The invention discloses a selective doping method for an N-type solar cell. The method comprises the steps of employing boron slurry as a heavily doped region diffusion source, and employing a gas-phase boron source as a lightly doped region diffusion source, before boron slurry is printed, covering the surface of a silicon wafer with a first oxide layer firstly, then covering the printed boron slurry with a second oxide layer, and through blocking of the two oxide layers, achieving the purposes that boron slurry outward expansion is reduced and the doping amount of a lightly doped region canalso be reduced, and during high-temperature propulsion, adopting a differentiated propulsion mode, firstly propelling a heavily doped region taking boron slurry as a boron source, then introducing agas-phase boron source, and jointly propelling the heavily doped region and the lightly doped region, so that heavily and lightly doped differentiated obvious distribution is realized.

The invention discloses a method for preparing a cobalt-based alloy layer on a surface of a TC4 titanium alloy and belongs to the field of titanium alloy surface processing. The method comprises that (1), a test sample is prepared; (2) the test sample is arranged on a working platform of a furnace, and a vacuum chamber is sealed; (3) a vacuum pump is opened, the inner portion of the furnace is pumped to the final vacuum, argon is filled, the inner portion of the furnace is pumped to the final vacuum again, and so repeats for 4-6 times; (4), argon is filled to 15-19Pa, cooling water is turned on, a sample power supply is switched on, and a sample is subjected to preliminary bombardment; (5), after the preliminary bombardment, the pressure is adjusted to the working air pressure, the source electrode voltage and the cathode voltage are adjusted to a preset value, and heat preservation is started; (6), after heat preservation is conducted for 1-2.5 hours, a source electrode power supply is turned off, the pressure is adjusted to 18-20Pa, the cathode voltage is reduced to 250-280V, and glow protection cooling is conducted; and (7), the air source and the cathode power supply are turned off, the inner portion of the furnace is pumped to the final vacuum again, and discharge is achieved after cooling. According to the method, a best parameter of a process when cobalt is infiltered into the surface of the titanium alloy can be determined, so that the high-temperature oxidation resistance of the titanium alloy is improved.

The invention relates to a boron process applicable for a P+ selective emitter battery. The boron process comprises the following steps of (1) performing constant source boron spinning; (2) drying; (3) allowing a boat to enter a furnace tube; (4) detecting leakage; (5) performing temperature-rising oxidization; (6) performing oxygen-free push; (7) performing high-temperature oxidization; (8) reducing a temperature; (9) performing low-temperature boron source deposition; (10) performing low-temperature push; (11) allowing the boat to get out; and (12) performing laser doping. By a joint effectof constant boron source boron push and gas boron source doping, on one hand, a light-doping region is formed, and an open-circuit voltage and a short-circuit current of the battery can be effectivelyincreased by a structure having a high surface concentration shallow junction; and on the other hand, a heavy-doping region is formed by secondary doping with laser, ohmic contact can be effectivelyimproved, and a filling factor is improved.

A filling baicalin-zinc medicine for killing and suppressing bacteria on skin and mucosa, relieving inflammation, and repairing mucosa tissue is proportionally prepared from viscose filming material, glycerin, tween-80, and baicalin zinc.

A nitriding process for a maraging steel is provided in order to increase the compressive residual stress of the maraging steel. A workpiece is made of maraging steel in which titanium is solid solved, and a partial amount of the titanium is oxidized at the surface of the workpiece so that titanium oxide is positively generated and concentrated at the surface. Then a reducing treatment is sufficiently performed as a pretreatment of a nitriding step, thereby removing oxygen. As a result, surface concentration of the titanium in an activated state is increased. Next, by performing the nitriding treatment, the reduced titanium and the solid solved titanium combine with nitrogen as titanium nitride. The titanium is in the activated state and is thereby easily nitrided. Moreover, the surface concentration of the titanium in the activated state is high, whereby a large amount of nitrogen infiltrates into the workpiece.

The invention provides a preparation method of a manganite-loaded ordered mesoporous carbon composite material. The preparation method includes the steps that S1, a micromolecule carbon source, acid and a mesoporous material are mixed in an alcohol solvent and heated for a polymerization reaction, so that a first intermediate product is obtained; S2, the intermediate product and a manganese source are mixed in an alcohol solvent, after the solvent is evaporated, roasting is conducted in protective atmosphere, and finally a second intermediate product is obtained; S3, the mesoporous material in the second intermediate product is removed, so that the manganite-loaded ordered mesoporous carbon composite material is obtained. Compared with the prior art, on one hand, manganite in the composite material is evenly loaded on the surface of mesoporous carbon, in this way, the exposure area of the manganite is increased, then the number of reaction locuses is increased, on the other hand, since ordered mesoporous carbon is used as the substrate of the composite material, mesoporous channels of media are stored, contaminants can be adsorbed, surface concentration can be increased, finally, the purpose of increasing the removal rate of contaminants is realized, and the contaminants can be well gathered and subjected to catalytic degradation.

The invention relates to a thermoplastic article having a continuous polymeric phase and a discontinuous discrete phase distributed within the continuous phase. The discontinuous phase may be inorganic materials or an organic phase. The volume fraction of the discrete phase at the surface of the article is plus or minus 15% of the concentration of the additive as compared to the concentration of the additive in the bulk of the material (>20 micrometers). The invention also relates an article where the discrete additive forms domains in the surface region—potentially beneficial for gloss reduction or electrical conductivity. The invention finally relates to a process for forming a thermoplastic article with surface additive enhancement, with inclusion of inductive heating of one or more surfaces of the mold to induce the unique distribution.

The invention discloses a preparation method of a liquid-cladding modified lithium ion battery negative pole piece. The liquid-cladding modified lithium ion battery negative pole piece comprises a negative active material, a conducting agent, negative adhesive, a liquid modifying agent, a solvent and a negative current collector. Compared with prior art, a lithium ion battery made of the negative pole piece has advantages of high specific energy, high specific capacity and good safety, and the weaknesses of the existing lithium ion battery cathode material that the specific energy is low, the material structure is instable, the cycling property is poor, and the resistance to the corrosion of electrolyte is poor can be overcome. The preparation method is simple in process, low in production cost and suitable for industrialized mass production.

The invention belongs to the technical field of photovoltaics, and particularly relates to a preparation method of a PERC battery. The method is mainly used for improving the efficiency of the PERC battery. The method comprises a diffusion step, an etching step and a back film step which are carried out in sequence, an etching solution is adopted in the etching step, and chemical components of the etching solution comprise HNO3, HF, H2SO4 and H2O; and in the back film step, SiH4 and NH3 are adopted to carry out film coating deposition on the back surface of the silicon wafer, and the film coating deposition times is twice. Compared with the prior art, the method increases the refractive index of the silicon wafer substrate, increases the light absorption rate of the PERC cell, and increases the efficiency of the PERC cell.

Provided is a power semiconductor device and a manufacturing method thereof. The power semiconductor device comprises a first doping type semiconductor substrate which is provided with a device area. A second doping type main junction area and multiple field limiting rings are formed at the edge of the device area. The first doping type and the second doping type are opposite. A first doping area is formed in the semiconductor substrate arranged between the main junction area and the first field limiting ring adjacent to the main junction area. The doping type of the first doping area is the same with that of the semiconductor substrate, and doping density is higher than that of the semiconductor substrate. In the semiconductor power device, surface concentration of the semiconductor substrate between the main junction area and the first field limiting ring is increased by the first doping area between the main junction area and the first field limiting ring. Influence on the electric field caused by field plate accumulation of movable charges on the main junction area under the high-temperature and high-voltage condition can be effectively reduced due to high electronic potential.

The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to an ultralow-static polyolefin porous membrane, a raw material formula, a preparation method anda battery. The raw material formula of the ultralow-static polyolefin porous membrane comprises the following raw materials in parts by mass: 100 parts of a solvent; 10-35 parts of a polyolefin composition; and 0.3-3 parts of antistatic agent. In the processing process, the antistatic agent is added into the polyolefin composition, and the non-uniform distribution of the antistatic agent in the resin, namely high surface concentration and low internal concentration, is utilized, so that the antistatic agent generates an antistatic agent molecular layer on the surface of a diaphragm or a base material, and the generation of static electricity on the surface of the porous membrane of the secondary battery is remarkably reduced.

The invention provides a box-method boron microcrystalline glass source concentrated boron diffusion method which comprises the steps of S1) carrying out high-temperature pretreatment on boron microcrystalline glass to obtain pretreated boron microcrystalline glass; S2) stacking the pretreated boron microcrystalline glass and a silicon wafer to be subjected to diffusion treatment, and heating for diffusion treatment to obtain a treated silicon wafer, wherein the front surface of the silicon wafer to be subjected to diffusion treatment is in contact with the pretreated boron microcrystalline glass; and S3) removing borosilicate glass on the surface of the treated silicon wafer to obtain the silicon wafer subjected to boron diffusion treatment. Compared with the prior art, the PWB source is in direct contact with the Si wafer, so that a shallow junction can be formed while high surface concentration is realized; secondly, the upper surface and the lower surface of the PWB source can be in contact with the to-be-doped surfaces of the two layers of Si wafers respectively, so that the diffusion efficiency is improved; moreover, the method provided by the invention only uses one-step diffusion, does not need to take out the Si wafer midway for treatment, is simple in process and easy to operate, and avoids unnecessary pollution.