71 results about "Mesophase" patented technology

The invention discloses a dual-mode micro-droplet generation micro-fluidic chip and application thereof in generation of dual-emulsion droplets, and relates to the technical field of micro-fluidic chips. The method comprises the following steps: respectively injecting two different internal phase solutions from the left ends of respective iron tubes, guiding the internal phase solutions to a wedge-shaped tube orifice of a theta-shaped glass capillary tube through respective thin tubes, injecting an intermediate phase solution into a square glass tube through an intermediate phase inlet by using a No.1 needle, and injecting an external phase solution into the square glass tube through an external phase inlet by using a No.2 needle; the two internal phase solutions, the intermediate phase solution and the external phase solution converge at an inlet of the circular glass capillary tube, and after entering the circular glass capillary tube, water-in-oil-in-water double-emulsion droplets are obtained. The invention can obtain the dual-mode micro-droplet generation micro-fluidic chip and the application of the dual-mode micro-droplet generation micro-fluidic chip in generation of dual-emulsion droplets.

The invention belongs to the technical field of perovskite solar cells, and particularly relates to a preparation method for improving the quality of a perovskite thin film by using a local high-temperature field, and the method comprises the steps: 1, forming a perovskite precursor thin film on an electron transmission layer; step 2, when the precursor film is in an intermediate phase or an incompletely crystallized state, placing the precursor film below a heating plate with a microstructure array, keeping a gap between a convex part of the microstructure array and the surface of the precursor film, and forming a periodically distributed local high-temperature field on the surface of the precursor film; step 3, maintaining the local high-temperature field to act for a period of time, so that the local area of the precursor film is preferentially crystallized; and 4, removing the heating plate, and uniformly annealing the precursor film. According to the method, a local high-temperature field is applied to induce a hot spot region to preferentially nucleate, abnormal growth and Ostwald ripening of crystal grains are inhibited, and the large-area uniform perovskite thin film with narrow crystal grain size distribution, low defect density and a flat film surface is obtained, so that the efficiency and consistency of a device are improved.

The invention relates to a strain vibration field measurement system and method based on optical multi-view three-dimensional imaging. The system comprises a camera imaging parameter calibration module for calibrating relative imaging parameters of other cameras by taking a middle camera as a reference, and outputting camera parameters and independent calibration results of each visual angle under a unified coordinate system; the feature point matching module is used for completing accurate matching of same-name feature points at different visual angles and different moments and outputting a standardized feature point matching result; the feature point three-dimensional coordinate reconstruction module is used for converting feature point information in the two-dimensional image into three-dimensional space coordinates to obtain three-dimensional position data of feature points; the three-dimensional displacement and strain resolving module is used for calculating the three-dimensional displacement and strain of the feature points of the region to be measured by taking the initial moment as a reference and generating three-dimensional displacement field and strain field data; and the result visualization module is used for converting the numerical three-dimensional coordinates, displacement and strain data into visual visualization graphs. According to the invention, surface strain monitoring of an object in a running state is realized.

The application discloses a kind of negative active material and its application.A kind of negative active material, including carbon material and silicon-based material;The carbon material includes artificial graphite, natural graphite, soft carbon, hard carbon, mesophase carbon microsphere, at least one in graphene;The chemical formula of the silicon-based material is X a Si b Y c Wherein, X includes at least one of P, As, Se, B, Ga, Mg, Al, Zn, Li, Y includes at least one of O, C, a, b, c satisfy 0≤a≤8, 0≤c≤10, 1≤(a+b)≤10, 2≤(b+c)≤10.The application has the advantages of improving the energy density, rate performance and cycle performance of lithium battery.

This invention discloses a method for preparing spinnable mesophase pitch. The method includes: (1) distilling catalytic oil slurry under reduced pressure at a separation temperature of 365-380℃ to separate light distillate and heavy distillate; (2) hydrogenating the light distillate from step (1), and fractionating the hydrogenated product to obtain hydrogenated light distillate II; (3) countercurrently contacting the heavy distillate from step (1) with an extraction solvent, thereby extracting the heavy distillate under supercritical conditions to obtain an extractant; (4) co-carbonizing the extractant from step (3) with the hydrogenated light distillate II from step (2) under an inert atmosphere and with a co-carbonizing agent to obtain mesophase pitch. This invention allows for more precise control of the utilization of catalytic oil slurry raw materials, improves the raw material utilization rate, and increases the yield and broad-spectrum mesophase pitch content of spinnable mesophase pitch.

The invention provides a high-performance negative electrode coke production process, and belongs to the technical field of negative electrode material production processes, and the high-performance negative electrode coke production process comprises the following steps: mixing solvent oil and maltha raw materials according to a solvent ratio of 0.9-1.2: 1, mixing the solvent oil and the maltha raw materials, carrying out settling separation through a settling tank to produce light-phase oil, heating the light-phase oil through a heating furnace, and feeding the light-phase oil into a light-phase tower, refined asphalt is produced from the tower bottom; heating the refined asphalt, fractionating in a fractionating tower, and producing coker oil from the bottom of the fractionating tower; the method comprises the following steps: heating coking oil, feeding the heated coking oil into a coke tower, and carrying out variable-temperature variable-pressure operation in a coking process to generate high-performance negative coke; by strictly controlling the solvent ratio and the ester-aromatic ratio, QI in the raw material can be efficiently removed, it is ensured that the QI content of the obtained refined asphalt is not larger than 0.1%, the softening point is controlled to be 35-50 DEG C, the heating furnace outlet temperature, the coke tower top pressure, the recycle ratio and the total feeding time are accurately controlled, variable-temperature and variable-pressure operation is implemented, and the optimal mesophase development environment is constructed; the grinding, graphitization and electricity storage properties of the negative electrode coke are improved.

The invention discloses a preparation method of mesophase pitch regulated and controlled by plasma-assisted directional bromination and catalytic debromination, and belongs to the technical field of high-value utilization of heavy oil and preparation of advanced carbon materials. The method comprises the following steps: (1) by taking aromatic hydrocarbon-rich heavy oil as a raw material, carrying out low-temperature plasma-assisted liquid-phase bromination reaction, and directionally introducing bromine atoms on an aromatic ring as activation and orientation sites, so as to construct bromination modified linear precursor asphalt; (2) carrying out supported metal hydride catalytic debromination-directional polycondensation reaction to synchronously realize total removal of bromine atoms, linear coupling between aromatic rings and improvement of molecular planarity, so as to prepare pre-mesophase pitch; and (3) carrying out heat treatment in a strong and uniform magnetic field, and enabling the liquid crystal state molecules to be highly and orderly arranged along the direction of the magnetic field by virtue of the orientation effect of the magnetic field on the pi electron cloud, so as to finally form the spinnable mesophase pitch with a wide-area streamline structure. The method realizes full-chain accurate regulation and control from molecular structure design to macroscopic orientation, and the prepared mesophase pitch has the characteristics of high anisotropic content (greater than 98%), moderate softening point (260-300 DEG C), highly ordered molecular arrangement and low quinoline insoluble content (less than 0.1%). The process is novel, and a brand new path is provided for preparing the high-performance mesophase pitch.

The invention relates to a low-temperature rapid calcination process of high-activity magnesium oxide, and belongs to the technical field of calcination processes, the low-temperature rapid calcination process comprises the following steps: S1, raw material pretreatment: sequentially carrying out coarse crushing, fine grinding and magnetic separation iron removal pretreatment on raw ore; s2, neutral oxygen-controlled first-stage roasting: feeding the pretreated powder into a suspension roasting furnace through a pneumatic conveying system, introducing oxygen-limited mixed gas, staying at 620 + / -10 DEG C for 7 + / -0.5 minutes, and carrying out partial decomposition; s3, carrying out self-reduction second-stage roasting; and S4, deep iron removal and quenching. According to the method, the problems that MgO crystals are coarsened and the specific surface area is smaller than 30 m < 2 > / g due to the fact that high-temperature calcination is needed for several hours at the temperature of 800-1000 DEG C in a traditional calcination process are solved, and according to the scheme, through segmented calcination at the low temperature of 620 DEG C and the total duration is smaller than or equal to 15 min, the energy consumption is reduced, meanwhile, a porous intermediate phase is formed through limited oxygen decomposition, crystal growth is effectively inhibited, and the specific surface area is effectively increased; the problem of impurity removal of the low-grade ore is solved, and the low-grade ore with Fe2O3 larger than 1.5% is subjected to circulating reduction iron removal through self-produced gas.

The application discloses a space circle pose detection method based on binocular vision, which is used for measuring the pose of a space circle. Firstly, Zhang Dingyou calibration method is used to calibrate the camera internal parameter, the camera external parameter and the camera distortion. Then, an intermediate camera coordinate system is constructed, two solutions of the center of the circle with unknown radius parameters and two solutions of the normal vector of the space circle plane in the left and right camera coordinate systems are calculated respectively, the correct center solution and the normal vector of the space circle are obtained according to the uniqueness of the center, the coordinates of the center of the space circle in the left and right camera coordinate systems are calculated based on the geometric constraint of the conic curve, and finally the radius of the space circle is calculated by bringing the center coordinates into the correct center solution with unknown radius parameters. The method can improve the processing speed and reduce the error of the pose measurement.

This invention relates to a method for preparing composite materials, specifically a method for preparing a high thermal conductivity C / SiC-ZrB2 composite material with a three-dimensional interpenetrating network structure, and the high thermal conductivity C / SiC-ZrB2 composite material itself. This invention addresses the shortcomings of existing technologies, such as the high difficulty in weaving mesophase pitch-based fiber preforms, which makes it difficult to obtain high thermal conductivity triaxial orthogonal preforms. The method of this invention utilizes a hybrid fiber formed by weaving pitch-based carbonized fibers and aramid fibers to prepare a first high thermal conductivity fiber preform. High thermal conductivity carbon nanotubes are then introduced, and a three-dimensional CNT@PyC@SiC matrix is ​​constructed by depositing a PyC pyrolytic carbon layer and a SiC layer. Finally, multi-component ZrB2 particles and SiC particles are used to regulate the stress compatibility between the matrix, resulting in a high thermal conductivity C / SiC-ZrB2 composite material with excellent thermal conductivity and mechanical properties.

This invention discloses a Ka-band focusing array dielectric lens based on impedance matching, comprising several dielectric lens units. Each dielectric lens unit has a three-layer dielectric structure, consisting of a front dielectric substrate, a middle phase modulator, and a rear dielectric substrate, arranged according to the electromagnetic wave incident direction. The dielectric constants of the three dielectric layers are set according to preset conditions. The thicknesses of the front and rear dielectric substrates are set based on the wavelength of the electromagnetic wave in their respective media. The thickness of the middle phase modulator is calculated based on the compensation phase of the lens unit. This invention reduces interface reflection loss by adjusting the thickness of the front and rear dielectric substrates and achieves phase compensation for different dielectric lens units by adjusting the thickness of the middle phase modulator, thereby improving the electromagnetic wave focusing performance.

Provided is a glass plate having a high average strength and a small degree of dispersion of the strength. A glass plate which contains a base glass phase and an intermediate phase, the base glass phase being an amorphous oxide that contains 50%-80% of SiO2, 0%-30% of Al2O3, and 0.1%-35% of Li2O in terms of oxide-based mol%, and the intermediate phase being an amorphous oxide that contains 50%-80% of SiO2, 5%-20% of Al2O3, and 5%-20% of Li2O in terms of oxide-based mol% and has a composition different from that of the base glass phase.

The application relates to a preparation process of a fast-charging negative electrode material, which comprises the following steps: preparation of mesophase pitch, preparation of artificial graphite material, preparation of pitch-coated silicon-carbon composite particles, preparation of carbon nanotube conductive agent, preparation of glucose-based hard carbon precursor, preparation of a silicon-carbon composite fast-charging negative electrode material and the like. The fast-charging negative electrode material prepared by creatively combining a thermal polycondensation reaction, a granulation process, a water-assisted chemical vapor deposition method, a hydrothermal method and the like has the advantages of more stable electrochemical performance, excellent rate performance and the like, can be applied to multiple fields such as power batteries and energy storage batteries, has a wide application field, and has a more promising application prospect.

The present invention relates to the technical field of carbon materials. Disclosed are a mesophase pitch, and a production method and production system therefor. The method comprises: (1) performing a first thermal reaction on a hydrocarbon-containing raw material to obtain a first gas-phase stream and a first liquid-phase stream; and (2) carrying out a second thermal reaction on the first liquid-phase stream to obtain a second gas-phase stream and a second liquid-phase stream, wherein the content of anisotropic components in the first liquid-phase stream is not greater than 10%, and the average particle size of mesophase spheres in the anisotropic components is not greater than 20 μm. The method is simple to operate, and the obtained mesophase pitch has the characteristics of a moderate softening point, good spinnability, etc.

This invention discloses a method for determining the percolation threshold of particle-type composite materials applicable to hard particles, softened inclusions, and those containing mesophases. The method includes: determining the percolation threshold of hard particle systems based on mesophase thickness reduction; determining the percolation threshold of particle systems containing thick mesophases based on Maxwell homogenization, volume-averaged depolarization factor, and scattering tensor; constructing an interpolation function based on the correlation ratio, considering the correlation effects of short-range repulsive fields and long-range scattering fields; and determining the percolation threshold of non-spherical particle systems with mesophases of arbitrary thickness based on the relative thickness parameter of the mesophase and the constructed interpolation function. This invention overcomes the limitations of existing theoretical techniques, which cannot cover a wide range of non-spherical particle systems and cannot quantify the percolation characteristics of materials under the influence of mesophase evolution. It also overcomes the technical bottlenecks of low efficiency and difficulty in guaranteeing accuracy in numerical simulation, enabling the effective determination of percolation phase transitions in drastically different particle-type composite materials.

This invention discloses a method for preparing large-area tin-based narrow-bandgap perovskite thin films based on solvent engineering, as well as the narrow-bandgap perovskite thin films, single-junction narrow-bandgap perovskite modules, and all-perovskite stacked modules prepared thereby. This invention uses a pyridine-containing mixed solvent system, in which pyridine and divalent tin ions have a stronger coordination interaction, effectively forming a strong electron donor-acceptor complex intermediate phase, and regulating the crystal growth process by altering the thermodynamic process. Furthermore, pyridine has a high saturated vapor pressure, and combined with an innovative vacuum-assisted annealing method, the perovskite phase transformation rate is adjusted by changing the kinetic process. Finally, a uniform and dense narrow-bandgap perovskite thin film with a corresponding thickness of 10.4 cm⁻¹ is obtained. 2 The all-perovskite tandem solar module achieved a photoelectric conversion efficiency of 22.9%.

The invention discloses a high-temperature-resistant insulating material as well as a preparation method and application thereof, and belongs to the technical field of functional polymer composite materials and preparation thereof. The high-temperature-resistant insulating material solves the problems that the insulating property of an existing high-temperature-resistant insulating material is degraded at the temperature of 150 DEG C, and the performance of the existing high-temperature-resistant insulating A-CF3 group is introduced into polyetherimide, a mesoscopic sequential phase structure with continuous periodicity is induced for the first time by utilizing the steric hindrance effect and the electrostatic repulsion effect of the polyetherimide, and the limitation of a traditional crystal-amorphous binary structure is broken through. Furthermore, the stability of the mesoscopic sequential phase is enhanced through a topological cross-linking agent (HTP), a density heterostructure is formed by the mesoscopic sequential phase structure and a short-range ordered domain to remarkably inhibit carrier migration, and the ultrahigh insulation performance of 800 MV / m or above is achieved at the temperature of 150 DEG C.

This invention discloses a catalytically assisted graphitization method for graphite materials used in lithium-ion battery anodes, belonging to the field of lithium-ion battery technology. Spherical mesophase carbon microspheres are mixed with ferric nitrate nonahydrate and ammonium molybdate in liquid phase and then spray-dried to obtain composite microsphere powder loaded with an iron-molybdenum catalyst precursor. This powder is then heated and mixed with medium-temperature coal tar pitch and cold isostatically pressed to obtain a composite green body. After gradient carbonization treatment, an isotropic stress field is established within the body using the shrinkage of the pitch carbonization. High-temperature catalytic graphitization is then performed at 2600℃-2800℃, causing the iron-molybdenum to form a eutectic catalytic system. This system, in conjunction with the stress field, induces carbon atom rearrangement, forming a highly crystalline graphite structure with a high degree of surface graphitization and an isotropic interwoven internal structure. Finally, the graphite is obtained through dissociation, pulverization, and classification. This invention achieves a balance between high capacity and high rate performance of the anode material through the synergistic effect of catalysis and the stress field.

Specifically disclosed in the present application are a negative electrode active material and the use thereof. The negative electrode active material comprises a carbon material and a silicon-based material. The carbon material comprises at least one of artificial graphite, natural graphite, soft carbon, hard carbon, mesocarbon microbeads and graphene. The chemical formula of the silicon-based material is (I), wherein X comprises at least one of P, As, Se, B, Ga, Mg, Al, Zn and Li; Y comprises at least one of O and C; and a, b and c satisfy: 0≤a≤8, 0≤c≤10, 1≤(a+b)≤10 and 2≤(b+c)≤10.

The application belongs to the technical field of perovskite solar cells, and particularly relates to a method for regulating crystal face growth in a perovskite crystallization process and application thereof in preparation of solar cells. Chloroformamidine hydrochloride (ClFACl) is doped into a perovskite precursor solution, so that the crystal face growth in the perovskite crystallization process is regulated. The final concentration of chloroformamidine hydrochloride in the perovskite precursor solution is 0.3-3.5 mg / ml. The application uses chloroformamidine hydrochloride as a crystal face regulator of the perovskite precursor solution, regulates the perovskite crystal face selectivity through an in-situ nucleophilic substitution reaction, induces the perovskite crystal to selectively grow along the (001) crystal face, improves the perovskite thin film crystallization quality, reduces the thin film defects, and suppresses the non-radiative recombination. The application makes the precursor solution nucleation homogeneous by introducing ClFACl, suppresses the generation of impurity phases, promotes the conversion of intermediate phases to alpha phases, and finally improves the photoelectric performance and stability of the device.

The disclosed embodiments may include a material having a composition that includes a mesophase pitch material that comprises from about 5.0% to 95.0% and at least one of about Ts < lt >, about Ts < lt >, about Ts < lt >, about Ts < lt >, about Ts < lt >, about Ts < lt >, and about Ts < lt >; the mesophase pitch material has a viscosity of about 0.01 to 102 Pascal seconds (Pa.s) in a temperature range of T < = 475 DEG C, where Ts > = 150 DEG C, at least a portion of the mesophase pitch material may be oriented by a magnetic field having an intensity of about 0.25 to 6.0 Tesla. The portion of the mesophase pitch material may have an average molecular spacing of about 3.4 to 3.7 angstroms and an average molecular size of about 1 to 3 nanometers (nm).

The invention discloses a delay line type filter based on an optimized single-phase transducer, which comprises an electrode layer, a piezoelectric material and a high-sound-velocity substrate, and is characterized in that the electrode layer is a patterned interdigital electrode which is periodically distributed; the graphical periodically-distributed interdigital electrodes are composed of two groups: one group is an input transducer, and the other group is an output transducer; the two groups of transducers are arranged in a mirror image manner, namely, the periodic directions are strictly aligned, and 1-1000 wavelengths are arranged between the two groups of transducers at a certain distance; according to the invention, the delay linear filter formed by the transducer has smaller insertion loss; meanwhile, the structure provided by the invention is suitable for all piezoelectric materials and acoustic modes, and in the LiNbO3-SiC material, the LiNbO3-SiC material has a Loff wave mode with a larger electromechanical coupling coefficient, so that the insertion loss can be reduced.

The invention relates to the technical field of heat dissipation materials, and discloses a high-thermal-conductivity graphite film and a preparation method and application thereof. The high-thermal-conductivity graphite film is prepared from the following raw material components: an asphalt mesophase, polyacrylonitrile, a nano reinforcement, a surfactant and a solvent, wherein the nano reinforcement is selected from at least one of graphene nanosheets and carbon nanotubes. The width of the prepared high-thermal-conductivity graphite film is gt by reasonably proportioning the raw material components and adopting the steps of coating slurry preparation, coating slurry film formation, pre-oxidation treatment, carbonization treatment, graphitization treatment and post-treatment; the thickness is 32-50 [mu] m, the heat-conducting property is excellent, and the heat conductivity coefficient is gt; after the aluminum alloy is repeatedly bent for 2000 times in a bending resistance test, the phenomena of cracking, layering or fracture do not occur.

This invention belongs to the field of special ceramics preparation technology, and provides a solderless diffusion-welded reaction-sintered silicon carbide special ceramic component and its preparation method. The invention involves mixing silicon carbide, a carbon source, a pore-forming agent, and metallic silicon powder, granulating the mixture, and cold isostatically pressing it to obtain a green body. Microgrooves are then machined on the end face to be welded. Subsequently, a suspension is vacuum impregnated and coated with a suspension containing mesophase carbon microspheres to construct an interface gradient layer. Finally, the component is aligned, assembled, and subjected to axial load, and the process is completed through reaction sintering. This invention utilizes the capillary pressure difference generated by laser microtexturing and pore gradient to induce the directional migration of liquid-phase silicon from the matrix to the interface. Through the in-situ reaction of liquid-phase silicon with the carbon source, a continuous silicon carbide solid-phase network is generated, physically blocking the outward diffusion channels of the liquid-phase silicon, achieving self-locking and densification of the welding interface. Specifically, this invention can be applied to special ceramic products such as ceramic valves and ceramic cylinder valve plates.

A battery includes a separator, a conductive substrate, a negative electrode connected to the conductive substrate, and a surface electrolyte mesophase (SEI) disposed between the separator and the negative electrode. And a surface electrolyte intermediate phase including a first layer coupled to the negative electrode and forming a first interface with the negative electrode and a second layer coupled to the first layer and forming a second interface with the separator, the first layer being made of a first material and the second layer being made of a second material different from the first material.

The invention relates to the technical field of battery negative electrode materials, in particular to a composite carbon negative electrode material, a negative electrode and a preparation method and application thereof. The preparation method comprises the following steps: mixing mesophase pitch nano-powder slurry with hard carbon precursor powder, and coating the surface of a hard carbon precursor with the mesophase pitch nano-powder slurry to obtain mixed slurry B; and heating the dried powder of the mixed slurry B to a temperature T DEG C ([t-(5-10)] < = T < = [t + (5-100)]), then carrying out pre-oxidation treatment at a temperature of 280-320 DEG C, and then carrying out high-temperature carbonization at 1200-1400 DEG C to prepare the composite carbon negative electrode material with the hard carbon core coated with the soft carbon. The prepared soft and hard carbon composite carbon negative electrode material for the negative electrode of the sodium ion battery has the advantages of high capacity, high first efficiency and good cycle performance.

The invention provides a method for synthesizing a high-silicon AFX molecular sieve through two-step crystal transformation of an FAU molecular sieve, and belongs to the technical field of molecular sieve preparation. According to the method, FAU is taken as a raw material, a CHA / AEI eutectic intermediate phase is synthesized under the action of double template agents, and the mass ratio of CHA to AEI in the eutectic molecular sieve is controlled by regulating and controlling the proportion of the double template agents, so that the silicon-aluminum ratio of the AFX molecular sieve is controlled.

The application discloses a tin-based perovskite film based on stress regulation, a preparation method thereof and a photoelectric device, wherein the preparation method comprises the following steps: placing a tin-based perovskite liquid film and a ligand solution in a same chamber, stopping air extraction after the chamber is vacuumized to be lower than 1000 Pa through air extraction, wherein the ligand solution is a solution containing an amine group or a mercapto functional group; maintaining a closed state of the chamber, tin-based perovskite is complexed with a solvent to form an intermediate phase solid film with heat stress impact resistance, and the ligand solution continuously volatilizes to fill the chamber to form a ligand atmosphere, the ligand is combined with uncoordinated tin in the intermediate phase solid film to reduce surface defects; and taking out the intermediate phase solid film and then annealing. Through two-step regulation of stress impact and grasping the opportunity of defect treatment, the ligand is combined with uncoordinated tin in the intermediate phase solid film in vacuum drying, and dangling bonds and defects on the surface of the perovskite are weakened. Then, annealing treatment is performed, lattice distortion caused during annealing is reduced, and finally the quality of the tin-based perovskite film is improved.

The invention discloses a laser shock annealing preparation method of a quasi-two-dimensional perovskite thin film, the thin film and a solar cell thereof, and belongs to the field of photoelectric device manufacturing. According to the method, under the environmental condition, five-pulse laser acts on a perovskite precursor wet film covered with a transparent limiting layer, and crystallization is induced through the synergistic effect of laser-induced transient heat and shock wave pressure. According to the method, the microstructure of the thin film is optimized by forming a stable intermediate phase, constructing a uniform stress field and accurately regulating and controlling crystallization kinetics, and particularly, grain growth is promoted, defects are reduced, and organic-inorganic interaction is enhanced. The prepared thin film is high in crystallization quality and low in defect density. The solar cell prepared by using the material as a light absorption layer can effectively inhibit non-radiative recombination and optimize carrier transport, thereby synchronously realizing high power conversion efficiency and excellent long-term working stability.