127 results about "Crystallization kinetics" patented technology

The invention relates to the technical field of plastic mold parameterized simulation, in particular to a parameterized simulation model design method and system for a plastic mold. The method comprises the following steps: carrying out raw material fine preparation on a target plastic raw material to obtain a homogeneous dry material; performing multi-field rheological characteristic scanning on the homogenized and dried material, and extracting viscosity model parameters to obtain viscosity model initial parameters; precisely measuring thermodynamic characteristics of the plastic material on the homogenized and dried material, and analyzing crystallization kinetic behaviors to obtain crystallization kinetic model parameters; and carrying out material gene spectrum integration according to the initial parameters of the viscosity model and the parameters of the crystallization kinetic model to obtain a material gene spectrum. According to the method, through performance-driven parameter optimization and intelligent mold blueprint generation based on the material physical property and the microenvironment, the mold manufacturing efficiency and quality are remarkably improved, and the manufacturing cost is reduced.

The invention belongs to the technical field of solar cells, and particularly relates to a wide-band-gap perovskite solar cell with high open-circuit voltage and a method of the wide-band-gap perovskite solar cell. Derivative molecules of ethylenediamine and phenylethylamine and corresponding halide salt materials thereof are introduced below a perovskite light absorption layer of the wide-band-gap perovskite solar cell to serve as a buried interface modification layer, so that the performance of the cell is remarkably improved. Derivative molecules of ethanediamine and phenylethylamine and corresponding halide salt materials thereof can provide free electron pairs, and form a stable coordination structure with uncoordinated Pb < 2 + > ions in perovskite, thereby realizing regulation and control of perovskite crystallization kinetics. According to the invention, the crystallization quality of the wide-band-gap perovskite thin film is improved, and the method has the potential of promoting rapid development of an efficient three-junction laminated cell technology.

The invention discloses a crystal size distribution soft measurement method integrated with mechanism constraints. The method comprises the following steps: 1) data acquisition and integration; 2) modeling training and model testing: constructing a crystal size distribution soft measurement model integrated with mechanism constraint, training a training data set, injecting crystallization process dynamics knowledge into the Kolmogorov-Arnod network in a loss function form, improving the nonlinear modeling capability and credibility of the model, and performing model testing on the Kolmogorov-Arnod network; and verifying test set data by using the trained model. According to the method, the knowledge of the crystallization dynamic process is injected into the Kolmogorov-Arnod network in the form of the loss function, so that the prediction capability of the model on the crystal size distribution in the crystallization process and the credibility of the model are effectively improved.

The invention belongs to the field of wastewater treatment and crystallization kinetics, and provides a kinetics prediction method for induced crystallization of calcium sulfate in wastewater, which comprises the following steps: detecting to obtain a water quality index, and calculating the solution supersaturation degree S and the initial chemical potential driving force delta mu through the water quality index; calculating values of a first saturation parameter a, a second saturation parameter b and a third saturation parameter c according to the saturation S; according to the parameters a, b and c and the chemical potential driving force delta mu, calcium ion concentration values at different crystallization moments are calculated, and the progress of removing Ca < 2 + > in the wastewater is determined. According to the method, the ion concentration change value under each crystallization reaction condition can be calculated, the accurate regulation and control of the calcium sulfate crystallization process are realized, and a theoretical support is provided for the industrial process control of calcium sulfate induced crystallization.

The invention relates to active magnesium oxide as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) reversely injecting a magnesium-containing solution into a carbonate solution to obtain a mixed solution; (2) reacting the mixed solution, and then performing dynamic gradient drying to obtain a basic magnesium carbonate precursor; the dynamic gradient drying comprises at least two drying stages; and (3) carrying out two-stage roasting on the basic magnesium carbonate precursor to obtain the active magnesium oxide. According to the preparation method of the active magnesium oxide provided by the invention, the reverse injection method, the solution reaction, the dynamic gradient drying and the two-stage roasting process are combined, and the crystallization kinetics and interface engineering in the preparation process are controlled, so that the prepared magnesium oxide has the characteristics of high activity, high specific surface area and high bulk density at the same time.

The present invention provides a method and device system for preparing sodium carbonate and / or sodium bicarbonate and co-producing ammonium sulfate from sodium-based wastewater. According to the phase equilibrium law of a multi-component water-salt system, through the regulation of crystallization kinetics and supersaturation, the sodium-based wastewater does not need to be evaporated and crystallized to produce sodium sulfate solid. Instead, the wastewater after simple pretreatment is directly treated to achieve gradient crystallization separation of sodium sulfate, ammonium sulfate and sodium bicarbonate, thereby obtaining high-quality sodium bicarbonate, sodium carbonate and ammonium sulfate products.

The invention discloses a tin-based perovskite material, a thin film and a preparation method and application thereof, and belongs to the technical field of perovskite materials, a hexafluorophosphate additive is adopted, and the additive and a tin-containing raw material (especially a perovskite precursor) have a synergistic effect, so that the defects of the tin-based perovskite material can be improved. The hexafluorophosphate additive has reducibility and can interact with Sn < 2 + > in the tin-based perovskite, oxidation of Sn < 2 + > in the tin-based perovskite is effectively inhibited, meanwhile, the crystallization kinetics of growth of the tin-based perovskite material can be regulated and controlled, the crystallization quality of the tin-based perovskite thin film is improved, and the performance of the tin-based perovskite thin film is improved. The defects that a tin-based perovskite thin film is difficult to form, the efficiency is low, and the stability of tin-based perovskite is poor are overcome, and then the stability and the photoelectric property of the tin-based perovskite material are improved.

The invention provides a perovskite precursor solution, a perovskite precursor film and a perovskite crystallization regulation method. The perovskite precursor solution contains a perovskite active material, an additive and a solvent; the perovskite active material is a perovskite active material which does not contain methylamino; the additive is a compound as shown in a formula A. According to the method, the compound with carboxyl and hydroxyl functional groups is selected as the additive to prepare the perovskite thin film, the crystallization kinetics process of perovskite is improved, the thin film with larger grain size and fewer grain boundaries can be obtained, the quality of the thin film is improved, and then the photoelectric conversion efficiency and stability of the solar cell are improved.

The invention discloses a method for determining the solution concentration in the crystallization process of 3, 4-dinitrofurazan furoxan oxide, and relates to the technical field of energetic crystal materials. According to the method, an EasySampler and HPLC (High Performance Liquid Chromatography) combined method is utilized, the solubility of DNTF is measured, a standard curve of DNTF solution concentration and peak area is established by utilizing a high performance liquid chromatograph, then the EasySampler is utilized to sample a crystallization process and perform HPLC analysis, and then the solution concentration at each moment is calculated by utilizing an equation of the standard curve. According to the method, EasySampler equal interval sampling is combined with off-line HPLC (High Performance Liquid Chromatography) analysis, and a curve that the concentration of the main component of the solution changes along with the temperature is constructed. In the dominant period of crystal growth, the concentration change rate and the solid-liquid interface area are in an approximately linear relationship. The experimental data provides a necessary demonstration basis for subsequent improvement of a non-ideal system crystallization kinetics theory.

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 provides a semitransparent perovskite thin film, the chemical formula of a perovskite material is FA < 0.8 > MA < 0.15 > Cs0 < 0.05 > Pb < (I < 0.76 > Br < 0.24 >) < 3 >, FA is formamidine, MA is methylamine, Pb is N, N is N, N is N, N is N, N is N, N is N, N is N, N is N, N is N The perovskite material is doped with 5-bromoacetyl-2-hydroxybenzamide, and the perovskite material is doped with the 5-bromoacetyl-2-hydroxybenzamide. According to the perovskite material provided by the invention, an amide group in the 5-bromoacetyl-2-hydroxybenzamide respectively forms a hydrogen bond and a coordinate bond with halogen and uncoordinated Pb < 2 + > ions for interaction, and a hydroxyl group and an acetyl group in the 5-bromoacetyl-2-hydroxybenzamide also can form interaction with perovskite; the crystallization kinetic process of perovskite is regulated and controlled, more uniform nucleation sites are provided, the nucleation speed is high, the crystal growth speed is low, and the perovskite crystal film which is high in crystallinity, large in grain size and free of holes is obtained. The invention also provides a preparation method and application of the semitransparent perovskite solar cell.

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.

The invention discloses a preparation method of regenerated ultra-low shrinkage black polyester staple fibers, and relates to the technical field of polymer waste recovery and regeneration, the preparation method comprises the steps of raw material mixing, drying treatment, spinning forming, post-treatment section, curling and cutting and finished product treatment, and when the shrinkage rate of the regenerated polyester staple fibers is controlled, the shrinkage rate of the regenerated polyester staple fibers is controlled by establishing a gradient temperature regulation and control program. Differentiated heat setting paths are set according to different regenerated raw material components, so that the accuracy of eliminating the internal stress of the fiber is ensured, the problem of abnormal shrinkage caused by local thermal stress concentration is avoided, the stability of the ultralow shrinkage performance of the fiber is ensured, and the size reliability of a product is improved; when fiber in-situ coloring and structure strengthening are carried out, synchronous achievement of color uniformity and ultra-low shrinkage characteristics is guaranteed by synchronously tracking the dispersion state of color master batches and crystallization dynamic evolution.

The application provides a tin-based perovskite light-absorbing layer, a tin-based perovskite solar cell and a preparation method thereof, relates to the technical field of perovskite solar cells, and the tin-based perovskite light-absorbing layer comprises: a tin-based perovskite crystal phase and a spirobifluorene molecule doped in the tin-based perovskite crystal phase; the spirobifluorene molecule comprises 2,2',7,7'-tetra[N,N-bis(4-methoxyphenyl)amino]-9,9'-spirobifluorene (SBF). According to the application, the SBF molecule is introduced into a tin-based perovskite precursor solution, a strong coordination effect is formed between the SBF molecule and the tin-based perovskite precursor, and then the crystallization kinetics process of the perovskite is regulated; meanwhile, the SBF molecule can be used as a molecular adhesive to realize the connection between perovskite crystal grains and effectively passivate perovskite grain boundaries; in addition, the SBF molecule can also strengthen the interaction between the top of the perovskite layer and the buried interface, and finally realize the synergistic optimization of bulk and interface carrier kinetics.

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.

The invention provides a wide-band-gap perovskite solar cell and a preparation method and application thereof. The wide-band-gap perovskite solar cell comprises a conductive substrate, a hole transport layer, a perovskite active layer, an electron transport layer and an electrode layer which are sequentially stacked. The perovskite active layer comprises an organic phosphate ester compound. According to the wide-band-gap perovskite solar cell, the organophosphate compound is introduced into the perovskite layer, Br / I competitive crystallization and component distribution are regulated and controlled, phase homogenization of wide-band-gap perovskite is achieved, the ion migration potential barrier is improved, non-radiative recombination, component degradation and crystalline phase segregation are restrained, and the performance of the solar cell is improved. Therefore, the photoelectric properties and stability of the wide-band-gap perovskite solar cell and the perovskite-organic laminated solar cell are improved, and the problems of non-uniform phase distribution, high defect density, poor stability and the like caused by ion mismatching and crystallization kinetics problems of wide-band-gap perovskite are solved.

The invention belongs to the technical field of perovskite and solar cell devices thereof, and particularly relates to a method for enhancing defect passivation and inhibiting lead leakage of a perovskite assembly by modifying a buried interface with rutin and a derivative thereof. According to the invention, rutin and a derivative thereof are used for modifying a buried interface of perovskite, on one hand, regulation and control of perovskite crystallization kinetics and carrier transport kinetics are realized through chemical coordination and interface stress regulation and control, and the defects of elemental iodine and tetravalent tin are reduced and repaired by utilizing the rutin and the derivative thereof, so that dynamic transformation of the structure of the rutin is realized; the enhanced defect passivation and metal coordination capability is obtained, and the photoelectric conversion efficiency and long-term stability of the pure lead or tin-lead mixed perovskite assembly are effectively improved. And on the other hand, effective immobilization of Pb < 2 + > in the perovskite thin film is realized through physical-chemical dual guarantee by utilizing a synergistic mechanism of bottom perovskite physical hydrophobic protection and chemical coordination Pb < 2 + >, and lead leakage of a pure lead or tin-lead mixed perovskite assembly is effectively inhibited.

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.

The invention discloses a droplet microfluidic in-situ test chip and method for microbial mineralization crystallization kinetic research, and relates to the technical field of rock and soil tests. In order to solve the problems that in the prior art, a single crystal crystallization process is difficult to visualize and nucleation sites of crystals are difficult to observe in situ and in real time, the following technical scheme is provided: the device comprises an upper layer channel pattern layer, solid polydimethylsiloxane and cover glass, an oil phase liquid injection port is formed in the top of the upper layer channel pattern layer, and is connected with an annular oil phase pipeline; a first water-phase liquid injection port and a second water-phase liquid injection port are formed in the middle of the area where the annular oil-phase liquid injection pipeline is located, a pipeline connecting the first water-phase liquid injection port and the second water-phase liquid injection port forms a reaction liquid mixing area at the communication position of the water-phase liquid injection pipeline, a liquid drop generation area is formed at the communication position of the oil-phase liquid injection pipeline and the water-phase liquid injection pipeline, and liquid drops form an in-liquid-drop solution mixing area in the snakelike circulation pipeline. And the liquid drops flow out through the liquid outlet. The method has the advantages of high flux, accurate reaction conditions, accurate observation and the like.

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.

The invention belongs to the technical field of solar cells. The invention provides a methylamine-free wide-band-gap perovskite precursor solution, a perovskite thin film, a preparation method of the perovskite thin film and a preparation method of a perovskite solar cell. The methylamine-free wide-band gap perovskite precursor solution comprises a methylamine-free perovskite material, an organic solvent and an additive, wherein the additive is Pb (SCN) 2 and rubidium salt. The system of the methylamine-free wide-band gap perovskite is FA < 0.8 > Cs0. 2Pb (I < 0.75 > Br < 0.25 >) 3, so that the MA < + > degradation risk is eliminated, and the band gap of the methylamine-free wide-band gap perovskite is about 1.7 eV; the additives can play a synergistic role, namely lead thiocyanate (Pb (SCN) 2) and rubidium salt such as rubidium iodide (RbI) are used in a combined manner, and the Pb (SCN) 2 can accelerate crystal nucleus formation and regulate crystallization kinetics; pbI2 bulk phase residues are inhibited, and meanwhile grain fusion is promoted.

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 invention discloses a two-dimensional RP type perovskite single crystal based on p-fluorobenzene methylamine bromide and a preparation method and application thereof, and the preparation method comprises the following steps: preparing a precursor solution, adding chlorobenzene into the precursor solution, heating and stirring until the precursor solution is fully dissolved; placing the precursor solution in a constant-temperature furnace for heat preservation, and then placing the precursor solution in an air dry oven for cooling to room temperature in stages; and volatilizing the precursor solution at room temperature until crystals are completely separated out, taking out the crystals, cleaning and drying. Chlorobenzene is added in the crystal preparation process to serve as an anti-solvent for crystallization, the solubility is reduced, the crystallization rate is delayed, diffusion control growth is achieved, large-size single crystal growth, grain boundary reduction and interface contact optimization are achieved by regulating and controlling crystallization kinetics, and the obtained perovskite material is low in defect state density, low in dark current drift and good in performance. When the material is used for preparing an X-ray detector, a device with higher conversion efficiency and more stable photocurrent response can be obtained.