67 results about "Crystallization kinetics" patented technology

The invention discloses a precursor solution preparation method and a perovskite solar cell preparation method. The method comprises the following steps: preparing a perovskite precursor solution by taking dimethyl sulfoxide, 2-methyltetrahydrofuran and gamma-valerolactone as solvents; and adding a perovskite material into the solvent to form a perovskite precursor solution. A full-green solvent system composed of dimethyl sulfoxide, 2-methyltetrahydrofuran and gamma-valerolactone is adopted to prepare a precursor solution, the perovskite solar cell is prepared from the precursor solution, a specific solvent combination is matched with a corresponding coating rate and regulation and control crystallization kinetics, and a uniform and compact high-quality perovskite thin film can be prepared on a large area. The device efficiency is improved.

The invention discloses an application of diphenyl disulfide as an additive of an active layer of a photovoltaic cell and the photovoltaic cell, which comprises the step of adding a volatile solid additive diphenyl disulfide into the active layer to regulate and control the performance of the active layer. The solid additive is added in the acceptor film forming process, and acceptor molecule aggregation and crystallization behaviors are continuously regulated and controlled in the film forming process and the thermal annealing process. The introduction of diphenyl disulfide can synergistically optimize multi-stage crystallization kinetics, enhance H-aggregation and J-aggregation at the same time, promote the formation of a receptor fibrous polycrystalline structure, improve the carrier mobility, and effectively improve the exciton dissociation and charge transfer capabilities of the active layer. Based on the regulation and control, the organic photovoltaic device using the diphenyl disulfide as the additive realizes the significant improvement of photovoltaic performance, the energy conversion efficiency reaches 19%, a new development direction is provided for the design of a multifunctional solid additive and the accurate control of the form of an active layer in the future, and a powerful technical support is provided for organic photovoltaic industrialization in the future.

This invention discloses a bamboo-based spinning material and its preparation method, belonging to the field of polymer composite material technology. The material, by weight, comprises 45-65 parts polylactic acid, 20-40 parts modified bamboo-based filler, 5-15 parts poly(dibutyl terephthalate) adipate / butyl terephthalate, 1-3 parts glycidyl methacrylate, 0.5-1.5 parts aminosilane coupling agent, 0.1-0.5 parts antioxidant, 0.2-0.8 parts heat stabilizer, and 1-4 parts bamboo nanocellulose. Through a three-level gradient interface reinforcement of bamboo micropowder-bamboo short fiber-bamboo nanocellulose, synergistic interface engineering of silane coupling and epoxy reaction compatibility, and heterogeneous nucleation of bamboo nanocellulose to regulate crystallization kinetics, stable melt spinning of the polylactic acid-based composite material is achieved. The resulting fiber has a tensile strength of not less than 34 MPa and an elongation at break of not less than 22%, and is completely biodegradable, replacing petroleum-based polyester.

The invention relates to a preparation method of a perovskite solar cell, in particular to a preparation method of a 1-ethyl-3-methylimidazole acetate modified perovskite cell. The method comprises the following steps: 1, pretreating conductive glass; 2, preparing a hole transport layer; (3) preparing a 1-ethyl-3-methylimidazole acetate modified perovskite precursor solution; 4, depositing and crystallizing a modified perovskite absorption layer; 5, preparing an electron transport layer; and 6, coating a metal electrode. According to the method, the 1-ethyl-3-methylimidazole acetate ionic liquid additive is introduced into the perovskite precursor solution, so that the crystallization kinetics and morphology of the perovskite thin film are effectively regulated and controlled, the grain boundary and surface defect state density is remarkably reduced, non-radiative recombination is inhibited, and the stability of a perovskite phase is enhanced. According to the modification method, the photoelectric conversion efficiency and the long-term working stability of the perovskite solar cell are remarkably improved. Meanwhile, the adopted 1-ethyl-3-methylimidazole acetate additive is relatively wide in source, small in dosage, good in process compatibility and simple to operate, so that the method is suitable for being applied to preparation of the absorption layer of the perovskite solar cell and has commercial potential.

This application discloses a perovskite solar cell and its preparation method, a tandem solar cell, and a photovoltaic module, relating to the field of photovoltaic technology. In the preparation method of the perovskite solar cell provided in this application, an isobutylammonium iodide solution is coated onto a framework layer and annealed. The organic cations in the isobutylammonium iodide solution can remain on the surface and grain boundaries of the framework layer, acting as surfactants and passivators, rather than undergoing premature phase transition. The isobutylammonium iodide improves the wettability of the framework layer surface to the subsequent organic ammonium salt solution, ensuring uniform spreading and penetration of the organic ammonium salt solution, creating ideal conditions for homogeneous nucleation and growth. By utilizing isobutylammonium iodide to regulate crystallization kinetics, passivate defects, and expand the nucleation window, unreacted framework layer residue can be reduced, thereby improving the performance of the perovskite layer and the perovskite solar cell.

The application discloses an epitaxial growth template, a tin-based perovskite thin film and a tin-based perovskite solar cell, and belongs to the technical field of perovskite solar cells. The epitaxial growth template is prepared by the following method: stannous iodide, stannous fluoride, an organic ammonium salt containing a conjugated aromatic ring and tin powder are dissolved in a solvent, then the precursor solution is obtained by stirring for a period of time; the precursor solution is uniformly coated, then annealing is performed to obtain the epitaxial growth template. In view of the fast crystallization kinetics and disordered crystal orientation of the tin-based perovskite thin film, the epitaxial growth template is used to induce three-dimensional perovskite epitaxial growth, the crystallization rate of the tin-based perovskite is delayed, the (100) crystal face growth of the tin-based perovskite is promoted, the in-grain defect state density is minimized, uniform tin-based perovskite thin films are formed in a larger range, and finally the photoelectric conversion efficiency of the tin-based perovskite solar cell is improved.

The invention discloses a preparation method of a pure red light quasi-two-dimensional perovskite light-emitting diode device which is formed by overlapping a glass substrate with a transparent electrode (ITO), a composite hole transport layer, a quasi-two-dimensional perovskite thin film light-emitting layer, an electron transport layer, an electron injection layer and a metal back electrode. A quasi-two-dimensional perovskite thin film luminescent layer is prepared through a one-step anti-solvent solution method with a simple process, thioacetic acid S-ethyl ester is used as a novel anti-solvent, and crystallization kinetics of quasi-two-dimensional perovskite is adjusted to influence formation and distribution of a mixed phase (n phase) in the thin film. Therefore, the regulation and control of the spectrum and the enhancement of the stability are realized, the radiation recombination efficiency of excitons is improved, and finally, an efficient pure red light quasi-two-dimensional perovskite light-emitting diode (PeLED) device is successfully prepared in combination with a vacuum evaporation method.

This invention provides a ternary cathode precursor material, its preparation method, and its application. The preparation method includes: co-adding a nickel-cobalt-manganese mixed salt solution, a precipitant solution, and a complexing agent solution in parallel to perform a co-precipitation reaction; during the co-precipitation reaction, a crystal facet modifier solution is added to obtain a ternary cathode precursor material with a (010) crystal facet exposure ratio lower than that of the (100) crystal facet; the crystal facet modifier includes polyvinylpyrrolidone; the pH value during the co-precipitation reaction is 11-11.4, and the concentration of the free complexing agent is 0.9 mol / L-1.1 mol / L. The preparation method provided by this invention regulates crystallization kinetics, resulting in a ternary cathode precursor material with a low proportion of (010) crystal facet exposure, thus laying the foundation for preparing high-voltage single-crystal cathode materials with high cycle stability and high safety.

This invention relates to the field of plastic multilayer film molding technology, and discloses a co-extrusion molding method for coated multilayer polyethylene film, comprising: melting and extruding high-density polyethylene resin and medium-density polyethylene resin and molding them into a multilayer polyethylene co-extruded melt film; attaching it to the surface of a cooling roller and controlling the cooling to form a multilayer polyethylene base film; activating its surface by bombarding with a corona bombardment device to form an activated surface layer; coating the activated surface layer with an amide-based slip emulsion to form a wet coating and drying it. This invention reconstructs the cooling crystallization kinetics of the co-extruded melt, inhibits the crystallization of high-density polyethylene, forms a metastable amorphous skin layer with high free volume in situ on the outer surface, provides a sensitive target area for introducing polar groups, inhibits the crystal phase shear deformation of the film under high temperature conditions, blocks stress concentration, and ensures that the film maintains morphological stability in a high-temperature cooking environment.

The application discloses a preparation method of Bi-doped N-type PbSe-based thermoelectric material and belongs to the technical field of thermoelectric materials. PbSe-based nanoparticles are synthesized by doping with a heterogeneous element Bi through a solvothermal method, a small amount of a strong reducing agent N2H4H2O is additionally added to optimize the doping effect, bulk thermoelectric material is prepared by combining a hot-pressing sintering process, and is denoted as Pb 1‑ x Bi x Se-y, wherein y is the volume of 85% mass concentration N2H4H2O, and the unit is mL. The preparation of N-type PbSe-based thermoelectric material in a wide temperature range is realized by doping with the heterogeneous element Bi, the strong reducing property of hydrazine inhibits the hydrolysis or oxidation side reaction of Bi 3+ , the coordination effect can control the crystallization kinetics of the precursor, promotes the uniform doping of Bi in the PbSe crystal lattice, and significantly improves the effective doping concentration of Bi. The carrier concentration is greatly improved, and the thermoelectric performance of the PbSe-based thermoelectric material is significantly improved, and the ZT value of the obtained Pb 0.98 Bi 0.02 Se-0.2 sample thermoelectric material is 1.06 at 823 K. The process is simple, has the advantages of low energy consumption and short cycle compared with the traditional solid-phase melting method.

The invention discloses a method for crystallizing alpha-cyclodextrin, and belongs to the technical field of cyclodextrin production. The invention discloses an alpha-CD crystallization method, which controls crystal growth by regulating and controlling a crystallization kinetic process, shortens a crystallization period, can obtain higher alpha-CD crystallization yield in a shorter crystallization time, does not need to add an organic solvent, and is simple in preparation process, easy to operate, short in crystallization period and suitable for industrial production. Meanwhile, the defect that alpha-cyclodextrin generates fine crystals under the condition of high supersaturation degree is overcome, the particle size of the crystals is greatly increased, the product quality and the crystallization yield are further improved, subsequent centrifugal separation is facilitated, and the method is suitable for large-scale production. The obtained alpha-cyclodextrin crystal is higher in purity, more uniform in particle, good in fluidity, stable in quality, needle-shaped, smooth and flat in crystal face, high in bulk density, small in angle of repose, simple in process and convenient for industrial production.

The invention belongs to the technical field of photoelectric materials and devices, and particularly relates to a perovskite light-emitting-photovoltaic dual-function device and a preparation method thereof. The preparation method comprises the following steps: sequentially preparing an electron transport layer, a perovskite light-emitting-photovoltaic active layer, a hole transport layer and a top electrode on a transparent conductive substrate; the method is characterized in that when the perovskite light-emitting-photovoltaic active layer is prepared, specific functional molecules (such as beta-alanine, 5-amino valeric acid, phenylethylamine iodide, sulfaguanidine and the like) are introduced into a perovskite precursor to cooperatively regulate and control crystallization kinetics of perovskite, defects are passivated, and the perovskite light-emitting-photovoltaic active layer is prepared. And a microstructure (such as an embedded submicron cavity or a vertical single-layer crystal grain) which is beneficial to light management and carrier bidirectional transmission is guided to be formed. The device manufactured by the method can work as a high-efficiency light-emitting diode (EQEgt, 25%) and also can work as a high-efficiency solar cell (PCEgt, 15%), bidirectional high performance of optical-electric conversion is realized, and an effective scheme is provided for developing a novel integrated optoelectronic system.

The application discloses a kind of based on 3,3'-thiodipropionic acid pre-positioning regulation perovskite film preparation method, perovskite film and perovskite solar cell.For the problem that one-step method formamidine lead triiodide perovskite film exists in the process of anti-solvent induced crystallization kinetics uncontrollable, grain is small, and many defects, the preparation method disclosed in the application introduces trace 3,3'-thiodipropionic acid as additive in precursor solution.The additive is pre-coordinated with lead ions in the solution stage, and uniform wet film is quickly formed during spin coating, and controlled release and slow crystallization of lead species are realized during subsequent annealing process, so as to synergistically optimize film formation and crystallization kinetics.This method can significantly promote perovskite grain growth, reduce grain boundary density, and passivate film defects.Finally, the solar cell device based on the film shows higher photoelectric conversion efficiency and more excellent long-term working stability.

The application discloses a dual-mode flexible capacitive sensor based on phase change regulation and a preparation method, and belongs to the technical field of flexible sensors. The method comprises the following steps: preparing a temperature-sensitive phase change composite dielectric layer film, and performing hot pressing and bonding under the condition that the temperature is lower than the melting point of polycaprolactone; and the dual-mode flexible capacitive sensor is subjected to controlled cooling by using different cooling rates. According to the application, the thermal history of the temperature-sensitive phase change composite dielectric layer is eliminated and the controlled cooling is performed after the completion of the assembly of the device, the crystallization kinetics and the thermodynamic competition mechanism of the semi-crystalline polymer under different cooling rates are utilized, the physical reconstruction of the internal microstructure is realized, and therefore the same sensor can be reversibly configured between the high-sensitivity mode and the wide-range mode in situ.

This invention discloses a method for preparing halide perovskite thin films and their applications. The preparation method includes the following steps: S1, providing a substrate; S2, mixing a precursor salt with a lactone solvent to form a precursor mixture; S3, depositing the obtained precursor solution onto the surface of the substrate and annealing it to form a perovskite thin film. This invention, by introducing a monocyclic lactone, overcomes the limitations of the traditional DMF / DMSO solvent system, significantly expanding the material compatibility range of solution processing, enabling stable film formation over a wider range of concentrations and temperatures. Utilizing the unique coordination ability and volatility characteristics of this type of lactone, crystallization kinetics can be effectively controlled, promoting more uniform and dense perovskite grain growth, significantly reducing the defect density inside the film, thereby obtaining a film with high crystallinity.

The invention discloses a hydrogen bond network stable perovskite solar cell based on bimolecule co-anchoring and a preparation method thereof, and belongs to the technical field of thin film perovskite cells. According to the invention, combination of HDA and FAI is realized through carbene mediation under a thermal activation condition. -C = N and-COOH groups in GS and uncoordinated Pb < 2 + > form stable bonding, so that lead ion leakage is effectively inhibited. A hydrogen bond network topological structure is constructed at the grain boundary through the synergistic effect of the two, and lattice strain is relieved through molecular flexibility, so that perovskite grains are stabilized, crystallization kinetics are regulated and controlled, the crystallinity is improved, and finally the photo-thermal stability and the phase state stability are enhanced. The power conversion efficiency of the perovskite solar cell optimized through HAD-GS combination reaches 26.07%, and the thermal stability and the light stability are improved.

This invention provides a formulation optimization method for low-warpage, low-stress whitening luggage materials, belonging to the technical field of formulation optimization for low-warpage, low-stress whitening luggage materials. This invention inputs component property parameters and injection molding process parameters into a formulation collaborative sensing model to collaboratively predict warpage values ​​and stress whitening probabilities. The formulation is then screened using a comprehensive formulation evaluation index. A crystallization-induced shrinkage anisotropic warpage prediction algorithm based on the Avramie equation is used to calculate the warpage deflection field by coupling crystallization dynamics and thermoelastic constitutive equations point-by-point at the finite element node level. Furthermore, a cross-scale whitening prediction algorithm is used to quantitatively characterize the stress whitening probability across three scales: molecular dynamics simulation, representative volume element finite element simulation, and Weibull distribution fitting. Finally, the optimized formulation is output after verification through the injection molding process. This method solves the technical problem that warpage prediction and stress whitening prediction cannot collaboratively characterize the interaction effects of high-order nonlinear components during the formulation optimization of multi-component polypropylene luggage materials.

The invention relates to a method for preparing a perovskite thin film and a cell based on surface activity and the cell. The method sequentially comprises the following steps: adding a surfactant benzalkonium chloride into a perovskite precursor solution; applying the precursor solution containing benzalkonium chloride to the substrate; treating the precursor solution by adopting a multi-step spin-coating process, wherein airflow assistance or anti-solvent treatment is applied in the spin-coating process; and carrying out annealing treatment on the spin-coated film to obtain the perovskite film. According to the invention, the surfactant BAC is added to change the crystallization kinetics of the precursor ink, and the adhesive force of the perovskite ink to the non-wet charge transport layer of the substrate is increased. Due to the modification treatment of the BAC on the precursor ink, under the driving of the surface tension gradient induced by the surfactant, the existence of the BAC affects the surface tension of the perovskite precursor solution, so that the prepared perovskite thin film is compact in crystallization, the quality of the perovskite thin film is improved, and the charge trap is passivated.

The application relates to a perovskite precursor ink, a preparation method of a perovskite film and a battery assembly, which comprises a perovskite precursor active component and an organic mixed solvent; and further comprises an amphiphilic block copolymer additive; the amphiphilic block copolymer additive is composed of a perovskite-philic chain segment and a flexible hydrophobic chain segment and is connected through a covalent bond; the perovskite-philic chain segment is a polyvinylpyridine chain segment with a polymerization degree n of 10-100, and the flexible hydrophobic chain segment is a polyethylene oxide chain segment with a polymerization degree m of 20-200. In terms of crystallinity, the perovskite-philic chain segment in the additive has a strong coordination effect with lead ions, serves as a nucleation site to guide the uniform growth of crystals, effectively regulates the crystallization kinetics, and high-quality perovskite films with uniform crystal grain size and clear grain boundaries are obtained.

The invention relates to the technical field of pharmaceutical chemicals, in particular to a preparation method of high-purity all-trans-retinol, which is characterized in that beta-ionone is used as an initial raw material, quaternary ammonium salt phase transfer catalysis is carried out in the preparation step of a key intermediate C15 phosphate salt along a C15 + C5 synthesis route under strictly controlled low-temperature and weak-base conditions, and the high-purity all-trans-retinol is obtained. The purity and the yield of the intermediate are obviously improved; meanwhile, a three-stage purification strategy including extraction washing, single solvent crystallization and mixed solvent recrystallization is designed for a crude product, and impurities difficult to separate, such as cis-isomers, are efficiently removed by finely regulating solubility and crystallization kinetics. The method effectively overcomes the defects of low product purity and poor stability in the prior art, can stably and economically prepare the all-trans retinol crystal with the purity not lower than 99%, and meets high-end application requirements.

The invention relates to the technical field of sugar alcohol crystallization, and discloses a high-fluidity crystal maltitol production method which comprises the following steps: pre-concentrating a maltitol solution; performing vacuum evaporation and concentration to a supersaturated state, adding a seed crystal, and maintaining evaporation and crystallization under the conditions of keeping vacuum and temperature; then transferring to a crystallizer, growing crystal at constant temperature, and then carrying out slow-to-fast stage cooling to finish cooling crystallization; and finally, centrifuging and drying to obtain a finished product. According to the invention, a vacuum evaporation and segmented cooling coupling crystallization technology is adopted, and explosive nucleation and fine powder generation are effectively inhibited by accurately controlling crystallization kinetics in an organic-solvent-free system. The obtained product is regular in crystal form, uniform in particle size distribution, small in repose angle, excellent in fluidity, high in crystallization yield and high in purity, and the technical problems that a traditional water phase crystallization product is prone to caking and poor in fluidity are solved.

The invention belongs to the technical field of industrial data processing, and particularly relates to a perovskite thin film defect tracing method and system, and the method comprises the following steps: collecting a real-time optical response data sequence of a perovskite thin film in a preparation process, obtaining a corresponding standard reference sequence, and carrying out the preprocessing of the real-time optical response data sequence; and respectively calculating a first derivative and a second derivative of the real-time optical response data sequence and the standard reference sequence, calculating a rate deviation according to the first derivative, determining a crystallization acceleration weight according to the second derivative, and combining the numerical deviation, the rate deviation and the crystallization acceleration weight to construct a crystallization dynamics inertia mismatch index. According to the method, the contradiction between leak detection in a constant speed period and delay in an outbreak period is solved, and the overall deviation of the system is amplified in a nucleation outbreak period and a logarithmic item weight index level, so that tiny dynamic anomalies can be caught sensitively, and hidden defects are effectively identified.

This invention belongs to the field of solar cell technology and relates to a method for preparing antimony sulfide selenide thin films based on liquid-gas synergistic post-treatment and its application in solar cells. The method utilizes gaseous substances generated by the melting and in-situ pyrolysis of a modifier to act on the antimony sulfide selenide thin film. Specifically, it includes the following steps: spin-coating a modifier post-treatment liquid onto the surface of the antimony sulfide selenide thin film, followed by heat treatment. During heating, as the temperature rises, the components of the treatment liquid first melt into a liquid state, promoting atomic mass transfer within the film and inducing grain growth; as the temperature further increases, the treatment liquid undergoes pyrolysis, generating gaseous substances until complete evaporation. These gaseous decomposition products can regulate the local vapor pressure of selenium and sulfur, inhibiting the escape of selenium and sulfur elements, exerting post-sulfidation and post-selenization effects, thereby optimizing the crystallization kinetics of the thin film. This method can reform grain growth, make the surface smoother and flatter, regulate the thin film composition to approach stoichiometry, passivate deep defects, improve the back interface quality of the device, alleviate the gradient distribution of the valence band position in the thin film, optimize band matching, and enhance carrier transport dynamics. This liquid-gas synergistic effect significantly improves the overall quality of the film, ultimately enhancing its photoelectric properties. This invention is the first to employ a liquid-gas synergistic approach to treat the surface of antimony sulfoselenide films, providing a new avenue for subsequent optimization of these films.

The invention discloses an extrusion process of a special PEEK wire for 3D printing. The extrusion process comprises the following steps: (1) drying raw materials; (2) low-shear plasticizing; (3) uniformly and stably extruding; (4) extrusion of a mouth die and expansion compensation sizing; (5) cooling crystallization control and wire rod cooling shaping; (6) performing online wire diameter detection and traction closed-loop control; (7) rolling; the preparation method has the beneficial effects that by adopting a low-shear plasticizing mode and a stable micro-extrusion and crystallization path control process, uniform dispersion of the reinforcing filler in a matrix can be realized on the premise of not introducing excessive shear orientation, and the problems of melt elasticity enhancement and flow instability caused by introduction of the filler are reduced; meanwhile, controlled crystallization treatment is carried out on the wire rod in a crystallization rate limited temperature area, the disturbance effect of relative crystallization kinetics can be relieved and enhanced, and the stability of the structure and the printing performance of the obtained composite wire rod can still be kept in the storage and 3D printing preheating process.

The invention discloses a method and a system for integrating high-flux steam exhaust, hot-pressing densification and controlled crystallization of a water-based PHA (Polyhydroxyalkanoate) coating wet film, belongs to the fields of high polymer material processing, transmission phenomena in chemical engineering and papermaking science, and is suitable for a high-speed production line of 50m / min to 1200m / min. In order to solve the problems that pinholes are easy to generate and densification is insufficient during high-speed coating of water-based PHA, by pre-adjusting and optimizing wet film rheology and utilizing a specific micro-nano structured interface and partition negative pressure technology, more than 80% of high-efficiency steam exhaust is realized, and the Leidenfrost effect caused by interface steam is thoroughly eliminated. Meanwhile, a heat source as high as 400 DEG C is adopted for dynamic thermal compensation to break through the thermodynamic bottleneck, and precise dew point difference is matched to regulate and control crystallization kinetics. Compared with a traditional process, the method has the advantages that defect-free densification and performance setting of the coating are achieved within a very short time, the obtained product is excellent in barrier property, high in heat sealing strength and easy to recycle, energy consumption is remarkably reduced, production efficiency is improved, and the method has great industrial application value.

The invention relates to a perovskite precursor solution, a perovskite thin film, a perovskite battery and a preparation method thereof, and belongs to the technical field of perovskite batteries. The perovskite precursor solution comprises a perovskite material, an additive containing multiple sulfonyl chloride groups and an organic solvent, the chemical formula of the additive containing multiple sulfonyl chloride groups is shown in the specification, wherein R1 and R2 are independently selected from C1-6 alkyl, alkenyl, alkynyl, cycloalkyl, phenyl, five-membered heteroaryl, six-membered heteroaryl or ether. By introducing an additive containing a multi-sulfonyl chloride group into a perovskite precursor solution, regulation and control of perovskite crystallization kinetics and multi-site synergistic passivation of bulk phase and grain boundary defects are realized, so that the photoelectric conversion efficiency and long-term operation stability of the perovskite solar cell are comprehensively improved.

The invention relates to a method for synergistically deeply removing iron and organic matters in a zinc sulfate electrolyte based on ultrasonic induced goethite directional crystallization, and belongs to the technical field of hydrometallurgy and industrial wastewater treatment. Aiming at the problems that a traditional goethite method is low in removal efficiency and poor in synergistic removal capacity on organic matters, the method comprises the following steps: under the action of an ultrasonic external field, introducing oxygen into an acidic zinc electrolyte containing Fe < 2 + > and the organic matters, adding an oxidizing agent potassium permanganate, adding ZnO at the same time, and accurately controlling the pH value of a reaction system within a range of 2.0-4.0, so that iron is precipitated in a goethite form; the ultrasonic cavitation effect cooperates with the effect of an oxidizing agent, oxidation of Fe < 2 + > and hydrolytic crystallization kinetics of Fe < 3 + > are greatly accelerated, and in-situ formation of goethite with a high specific surface area and a nano-porous structure is promoted; high-activity hydroxyl radicals (. OH) are activated and generated to oxidize and degrade the organic matters, and meanwhile, the newly-generated high-activity goethite carrier is used for efficiently adsorbing and surface complexing the organic matters and degradation products thereof, so that synchronous deep removal of iron and the organic matters is realized.

The invention belongs to the technical field of photoelectric materials and devices, and particularly relates to a wide-band-gap perovskite solar cell for indoor photovoltaic and a preparation method of the wide-band-gap perovskite solar cell. Ammonium thiocyanate is added into a wide-band-gap perovskite precursor solution to serve as an additive, and the wide-band-gap perovskite type light absorption layer is formed through solution deposition and annealing treatment. Ammonium thiocyanate is added into a wide-band-gap perovskite precursor solution to serve as an additive, crystallization kinetics is delayed through the strong coordination effect of SCN <-> and Pb < 2 + >, and thin film defects are passivated synergistically. The obtained perovskite thin film has the advantages of large crystal grain, high crystallinity and low defect density, so that the prepared solar cell has extremely high open-circuit voltage and photoelectric conversion efficiency under indoor weak light, and is particularly suitable for supplying energy to micro-electronic equipment such as an Internet of Things sensor and the like.

The invention relates to the technical field of perovskite thin films, and discloses a perovskite thin film and a preparation method thereof, and an optical device and a preparation method thereof. The preparation method of the perovskite thin film comprises the following steps: providing a perovskite precursor solution and a substrate; coating the surface of one side of a substrate with the perovskite precursor solution, and performing a first annealing process at 90-100 DEG C for a period of time to form a crystal nucleus; and performing a second annealing process on the crystal nucleus for a period of time to form the perovskite thin film. The crystallization kinetics is improved by regulating and controlling the nucleation temperature of the perovskite thin film in the film forming process, the problems of efficiency loss, insufficient stability and the like caused by residual strain of the perovskite thin film are solved, the crystallization quality is remarkably improved, the perovskite thin film has the larger grain size, the higher crystallinity and the better orientation, and the perovskite thin film has the better application prospect. And the perovskite thin film can show very strong photoluminescence intensity, relatively long carrier lifetime and relatively good photophysical properties.

The invention belongs to the technical field of perovskite and solar cell devices thereof, and particularly relates to a method for dynamically and continuously repairing photo-generated defects of a tin-lead mixed perovskite solar cell by using a ferrocene derivative to improve light stability. According to the invention, a ferrocene derivative is used for modifying a buried interface of perovskite, and through strong coordination between the ferrocene derivative and metal cations (Pb < 2 + > / Sn < 2 + >) in perovskite crystal lattices, effective passivation of defects is realized, and regulation and control of perovskite crystallization kinetics and carrier transport kinetics are also realized. Besides, metallocene and corresponding cations can be used as redox pairs to cyclically and dynamically repair light-induced lead and iodine elementary substance defects, inhibit oxidation of divalent tin and play a role in shielding ultraviolet rays, finally, the photoelectric conversion efficiency of a device using the method is obviously improved, and the device has enhanced light stability and day and night operation fatigue resistance.