52results about How to "Uniform crystallinity" patented technology

By using lasers having different wavelengths in laser annealing of an amorphous semiconductor film, the amorphous semiconductor film can be crystallized and the crystallinity of the crystallized film is improved. A laser 126 to 370 nm in wavelength is used first to subject an amorphous semiconductor film to laser annealing, thereby obtaining a crystalline semiconductor film. In desirable laser annealing, a subject surface is irradiated with a laser beam processed by an optical system into a linear laser beam that is linear in section on the subject surface. Next, a laser 370 to 650 nm in wavelength is used to irradiate the above crystalline semiconductor film by again processing the laser beam into a linear beam through an optical system. A crystalline semiconductor film thus obtained has an excellent crystallinity. If this crystalline semiconductor film is used to form an active layer of a TFT, an electric characteristic of the TFT can be improved.

The speed of the laser scanned by the scanning means such as a galvanometer mirror or a polygon mirror is not constant in the center portion and in the end portion of the scanning width. As a result, the object, for example an amorphous semiconductor film, is irradiated with the excessive energy and therefore there is a risk that the amorphous semiconductor film is peeled. In the present invention, in the case where the laser spot of the energy beam output continuously on the irradiated object is scanned by moving it back and forth with the use of the scanning means or the like, the beam is irradiated to the outside of the element-forming region when the scanning speed of the spot is not the predetermined value, for example when the speed is not constant, and accelerates, decelerates, or is zero, for example in the positions where the scanning direction changes, or where the scanning starts or ends.

A mechanism for always measuring the spatial intensity distribution of a laser beam and displacement of the optical axis of the laser beam is provided so that a measured signal is processed when the laser beam incident on a laser beam shaping optical element is out of a predetermined condition. The shape, diameter and incidence position of the laser beam incident on the laser beam shaping optical element are always kept in the predetermined condition by a spatial filter disposed at the position of a focal point of lenses forming a beam expander disposed in the optical axis, on the basis of a result of the signal processing. In this manner, silicon thin films uniform in crystallinity can be formed stably with a high yield on an insulating substrate which forms display panels of flat panel display devices.

The invention discloses a method for preparing olefin polymer by utilizing multiple temperature reaction areas. The method provided by the invention comprises the following step of forming a plurality of olefin polymer reaction areas with different temperatures in a fluidized bed reactor by utilizing a circulating medium, wherein the circulating medium comprises an olefin monomer and a condensing agent. By utilizing the method, preparation of high-performance olefin polymer product by utilizing a single reactor is realized. The method is high in heat transfer efficiency. The olefin polymer prepared by utilizing the method is low in density, wide in distribution, uniform in degree of crystallinity and the like and can be widely applied to various fields of thin-film materials and the like.

The invention relates to a metal-coated MFI hierarchical pore structure packaging catalyst and a packaging method and application thereof. Micropores and mesopores are contained in the pore channel structure of the packaging catalyst, the N2 adsorption-desorption curve of the packaging catalyst has an adsorption-desorption hysteresis loop under the condition that the relative pressure p/p0 is 0.1-1.0, and the particle size of metal nanoparticles in the packaging catalyst is 1-10 nm. In the preparation process of the packaging catalyst, the MFI structure molecular sieve is modified, the packaging of the metal nanoparticles and the reaming of the MFI structure molecular sieve are realized in one step, and the crystallinity of the molecular sieve parent is not reduced in the preparation process so that the problems of non-uniform distribution, non-uniform particle size, large particles and easiness in migration, agglomeration and loss of the metal nanoparticles in the catalyst prepared bythe traditional wet impregnation method are solved; meanwhile, high molecular sieve crystallinity is maintained through broaching treatment, and the diffusion performance is remarkably improved.

The invention relates to a preparation method of a large-grain perovskite thin film. The preparation method takes mixed anionic cationic perovskite as a main system, and adds Pb (SCN) 2 as an additiveto regulate and control the growth of the thin film. The method comprises a process of preparing a thin film with a mixed anion-cation type perovskite precursor solution and an additive, and calcium-titanium ore thin film which is flat and compact and has large-size crystal grains can be obtained by adjusting and controlling the Pb (SCN ) 2 additive. The preparation method is simple in process, convenient to operate and capable of effectively and rapidly forming the film. The mixed type anionic type perovskite is adopted as a main system, and the growth of the perovskite thin film is regulated and controlled by using an additive, the growth of the large-size perovskite crystal grains is realized, and the internal defects of the thin film are reduced. The service life of carriers is prolonged, the defect of grain boundaries is reduced, and the environmental stability of the perovskite thin film is greatly improved. The performance of the perovskite solar cell is enhanced, and the preparation of the highly-efficient and stable perovskite thin-film device with low hysteresis is realized.

The invention discloses a preparation method of a meropenem trihydrate crystal, comprising the following steps: dissolving a crude meropenem product in water at 30-70 DEG C to obtain solution I; treating the solution I with active carbon and then filtering the treated solution at 5-30 DEG C to obtain solution II; adding an organic solvent to the solution II and then cooling to -20-0 DEG C to form a crystal nucleus; and melting the crystal nucleus, adding an organic solvent, and then crystallizing to obtain the meropenem trihydrate crystal. The preparation method is simple and feasible; and the obtained meropenem trihydrate crystal has uniform crystallinity, high purity and fast dissolving performance, and the crystal can be used for preparing a meropenem medicinal preparation with good dissolubility.

The invention relates to a perovskite solar cell prepared based on an acetic acid-methylamine room-temperature molten salt as a green solvent and a method and application of the perovskite solar celland belongs to the field of photoelectronic materials and devices. The method comprises the steps of stirring acetic acid and methylamine in an ice-water bath according to the stoichiometric ratio of1:1.5 for 2h and carrying out rotary evaporation on a rotary evaporator until no liquid drop drips to prepare an acetic acid-methylamine room-temperature molten salt; dissolving lead iodide and chlorine methylamine into an acetic acid-methylamine solution according to the stoichiometric ratio of 1:1 to prepare a perovskite precursor solution; carrying out spin-coating of the precursor solution onan ITO conductive substrate provided with a hole transport layer or an electron transport layer by using a thermal spin-coating technology separately and carrying out annealing to form a dense and uniform perovskite film with high stability, wherein the whole process is operated completely in the air; and then carrying out spin-coating on the electron transport layer or the hole transport layer onthe film and evaporating a modification layer and a metal Al electrode by using a vacuum evaporation technology.

The speed of the laser scanned with the scanning means such as a galvanometer mirror or the polygon mirror is not constant in the center portion and in the end portion of the scanning width. As a result, the object to be irradiated is irradiated with the excessive energy and thereby there is a risk that the amorphous semiconductor film may be peeled.

In the case of scanning the spot of the energy beam output continuously with the scanning means, the present invention is to block the CW beam irradiated to the regions in the object to be irradiated where the scanning speed of the spot accelerates, decelerates, and it becomes zero, that is to say, when the spot is in the position where the scanning starts and in the position where the scanning ends.

The invention discloses a preparation method for a graphene/three-dimensional flower-shaped bismuth ferrite composite absorbing material, and the method comprises the steps: mixing bismuth ferrite powder and oxidized graphene in corrosion solvent at the mass ratio of 25: (3-6), and obtaining mixed liquor A after supersonic processing; carrying out the heating and stirring of the mixed liquor A atthe protective atmosphere, adding a reducing agent and a complexing agent to the mixed liquor A in a dripping manner, carrying out the corrosion reaction for 40-50 min after dripping, and obtaining the three-dimensional flower-shaped bismuth ferrite powder through cooling. The method provided by the invention is novel, is uniform in particles, is low in requirements for the equipment operation, issimple in technology, is low in energy consumption, can achieve the continuous operation, and enables the process conditions to be controlled easily. Compared with a single phase, the composite material greatly improves the electromagnetic wave absorbing performances.

The invention relates to a melt/solid state polycondensation preparation method for polylactic acid, which mainly solves the problems of long reaction time, difficult continuous production or high cost in the prior art. The method comprises the following steps of: 1) performing a dehydration oligomerization reaction of lactic acid at the temperature of between 100 and 160 DEG C under the absolute pressure of between 6,000 and 25,000 Pa and under the action of a catalyst A for 0.5 to 5 hours first, and continuing the ehydration oligomerization reaction at the temperature of between of 120 and 180 DEG C under the absolute pressure of between 200 and 1,500 Pa and under the action of the catalyst A for 0.5 to 5 hours to generate a product I; 2) performing a melt polycondensation reaction of the product I at the reaction temperature of between 150 and 200 DEG C under the absolute pressure of between 30 and 600 Pa and under the action of a catalyst B for 0.5 to 15 hours to generate a polylactic acid prepolymer and lactide serving as a by-product, and refluxing the lactide to a reaction mixture at the reflux temperature of between 70 and 95 DEG C; 3) pelletizing the polylactic acid prepolymer obtained in the step 2), and crystallizing in an inertia airflow at the temperature of between 50 and 130 DEG C for 0.5 to 10 hours; and 4) performing a solid state polycondensation reaction of the polylactic acid prepolymer processed in the step 3) in the inertia airflow at the temperature of between 120 and 170 DEG C for 5 to 40 hours to obtain the polylactic acid. The technical scheme of the invention better solves the problem, and can be used for the industrial production of the polylactic acid.

It is an object to provide a laser apparatus, a laser irradiating method and a manufacturing method of a semiconductor device that can perform uniform a process with a laser beam to an object uniformly. The present invention provides a laser apparatus comprising an optical system for sampling a part of a laser beam emitted from an oscillator, a sensor for generating an electric signal including fluctuation in energy of the laser beam as a data from the part of the laser beam, a means for performing signal processing to the electrical signal to grasp a state of the fluctuation in energy of the laser beam, and controlling a relative speed of an beam spot of the laser beam to an object in order to change in phase with the fluctuation in energy of the laser beam.

The present invention relates to a cost effective and industrially advantageous process for the preparation of imipenem of high purity comprising the steps of treating an aqueous solution containing imipenem with an organic solvent, wherein the imipenem is not lyophilized; and isolating the pure crystalline imipenem monohydrate from the reaction mixture thereof.

It is an object to provide a laser apparatus, a laser irradiating method and a manufacturing method of a semiconductor device that make laser energy more stable. To attain the object, a part of laser beam emitted from an oscillator is sampled to generate an electric signal that contains as data energy fluctuation of a laser beam. The electric signal is subjected to signal processing to calculate the frequency, amplitude, and phase of the energy fluctuation of the laser beam. The transmittance of a light amount adjusting means is controlled in order that the transmittance changes in antiphase to the phase of the energy fluctuation of the laser beam and with an amplitude capable of reducing the amplitude of laser beam emitted from the oscillator, the control being made based on the phase difference between the phase of a signal that is in synchronization with oscillation of laser beam emitted from the oscillator and the phase calculated, on the energy ratio of the sampled laser beam to laser beam emitted from the oscillator, and on the frequency and amplitude calculated. In the light amount adjusting means, energy of the laser beam oscillated from the oscillator energy is adjusted.

The present invention provides an ethylene/alpha-olefin copolymer having narrow molecular weight distribution together with a low density and an ultra low molecular weight, having minimized number of unsaturated functional groups, and having uniform crystallinity, thereby showing excellent physical properties, and a method for preparing the same.

The invention provides a high-density LAS microcrystalline glass fiber and a preparation method thereof. The preparation method comprises the steps that lithium nitrate serves as a lithium source, aluminum nitrate serves as an aluminum source, tetraethyl orthosilicate and nano SiO2 particles serve as silicon sources, hydrochloric acid serves as a catalyst, a cosolvent absolute ethyl alcohol is added, an LAS precursor solution is prepared according to a certain proportion, then polymers such as PVP are added, a precursor solution with spinnability is obtained, electrostatic spinning parameters are set, and spinning is conducted; and then crystallization heat treatment is carried out on the collected fibers, grinding is carried out, and steps of ultrasonic crushing, volatilizing and drying are carried out to obtain nano LAS short fiber white powder. The material can be used as a reinforcing body to be added into LAS microcrystalline glass, crystals are induced to be separated out, and the mechanical property and the light transmittance performance of the microcrystalline glass are cooperatively improved.

The invention provides a manufacturing process of a large pressurized vessel pipe plate forging, and belongs to the field of large forging heat treatment processes. The manufacturing process of the large pressurized vessel pipe plate forging comprises the concrete steps of carrying out forged heat treatment, forging, and carrying out heat treatment after forging. The process provided by the invention is mature, and conveniently solves the problems that during a production process, forging is easy to occur, the acceptability is lower, and the internal deformation is nonuniform. The steps of heat treatment after forging comprise pretreatment, isothermal bainite treatment for the first time, pre-heat treatment for the first time, normalizing treatment for the first time, bainite treatment forthe second time, pre-heat treatment for the second time, normalizing treatment for the second time, bainite treatment for the third time, and hydrogen relief treatment, so that white points in the forging can be effectively removed, grains are refined, and the strength of the forging is favorably improved.

The invention discloses a preparation method of porous lanthanum oxide. The preparation method comprises the following steps of respectively weighing La(NO3).6H2O and glycerin with corresponding masses, preparing the La(NO3).6H2O and the glycerin with distilled water into a solution with a certain concentration, then adding a certain quantity of polyethylene glycol as a dispersant, adding a certain quantity of N-methyl-N-ethyl morpholine ionic liquid into a glycerin solution, then regulating the conditions, including concentration, pH value, heating time and heating temperature and the like, of the added ionic liquid, and synthesizing the porous lanthanum oxide with a low-temperature combustion method. The preparation method provided by the invention is simple, is liable to operate and mild in condition; the prepared lanthanum oxide is ultrafine powder with looseness in texture and easiness in crushing and without caking; and a novel method is provided for preparation of the porous lanthanum oxide.