136results about How to "Realize large area preparation" patented technology

The invention relates to a preparation method and application of a flexible stretchable sensing array based on a bidirectional pre-stretching elastic substrate and aligned carbon nanotubes. The preparation method comprises the steps of tiling a column of carbon nanotube films on the bidirectional pre-stretching elastic substrate; then spraying a dielectric layer mixed solution, vertically tiling another column of carbon nanotube films, wherein the perpendicularly crossing portion of the nanotubes forms a capacitor, and the acquired capacitor is of a CNTs / dielectric layer / CNTs structure; spraying the mixed solution again to serve as a protection layer; releasing the elastic substrate to the initial state so as to form a complex folded structure; and finally fixing a sensing unit by using anepoxy resin adhesive to obtain a capacitive flexible stretchable sensing array.

The invention discloses a large-area manufacturing method and a processing system for the surfaces of micrometer and nanometer structures with tunable periods and tunable morphologies. A laser interference processing method is a widely applied micrometer and nanometer processing means, but is limited and only can be used for realizing intensity distribution of interference fields with fixed periods and fixed morphologies, accordingly, micrometer and nanometer structures processed by the laser interference processing method have single morphologies and are poor in tenability, and requirements on processing multifunctional surfaces in specific designs cannot be met. The large-area manufacturing method and the processing system have the advantages that the large-area manufacturing method and the processing system aim to overcome the bottleneck of the traditional laser interference processing technology, a wave-front modulation device is used for precisely controlling wave-front phases and vibration amplitudes of beams on the basis of the original multi-beam laser interference processing system, so that preliminarily designed target intensity distribution of interference light fields can be realized, and the large-area micrometer and nanometer structures with the variable periods and the variable morphologies can be finally processed; an effective way can be provided for manufacturing the large-area surfaces of non-periodic and diversified structures on a large scale.

The invention relates to a needle-like copper hydroxide material prepared based on copper grid surface in-situ growth, a preparation method and an oil-water separating method. The needle-like copper hydroxide material grows on a copper grid in an in-situ mode and has a hydrophilic and oleophilic surface or a hydrophobic surface structure. The preparation method comprises the steps: (1) cleaning the copper grid up; (2) putting the copper grid in a sodium hydroxide and ammonium persulfate mixed solution to react; (3) repeatedly putting the copper grid or no putting the copper grid into the sodium hydroxide and ammonium persulfate mixed solution with a progressively-decreasing concentration to react according to need; (4) finally, directly putting the copper grid into the sodium hydroxide andammonium persulfate mixed solution with the concentration which is further reduced or deionized water to react and preparing needle-like copper hydroxide on the surface of the copper grid; (5) performing hydrophobic treatment on the copper grid according to need to obtain super-hydrophobic needle-like copper hydroxide on the surface of the copper grid. The needle-like copper hydroxide material disclosed by the invention has the advantages of simple method, easiness in operation and suitability for large-area preparation. The copper grid can be applied oil-water separation and has a higher oil-water separating efficiency.

A method for preparing a super-hydrophobic surface by nano-composite electro-brush plating belongs to the method for preparing of the super-hydrophobic surface. The method comprises the following steps: step1, preparation of plating: firstly, polishing carbon steel basal body, wherein the surface roughness Ra is 0.8, and then drying after cleaning; sedimentating double-layered nano-composite plating with micro-nano double coarse structure on the carbon steel basal body according to the process order of electrocleaning-second actification-third actification-bottom layer plating-plating of nanometer C / Ni composite plating-plating of nanometer Cu / Ni composite plating, using deionized water to wash after each step is finished, and then conducting next step; placing brush plated sample into alcohol, washing for 30 min in an ultrasonic cleaner, placing in a drying box at the temperature of 60 DEG C to dry for 1 h; step2, surface chemical modification: placing dried sample in prepared silicon fluoride solution to soak for 40 min at the temperature of 60 DEG C, wherein the mass ratio of Actyflon-G607 and absolute ethyl alcohol is 1:49, and taking out to dry in the drying box at the temperature of 100 DEG C for 1 h.

The invention discloses an organic micromolecular hole injection layer prepared by using a solution method. An organic film with 10-200nm of thickness is made from an organic micromolecular hole injection material and the mixed solution of the organic micromolecular hole injection material and other organic functional materials by a wet-process film forming process. The invention also discloses an electroluminescent device of the organic micromolecular hole injection layer prepared by using the solution method. The electroluminescent device sequentially comprises a substrate, a transparent anode, an organic micromolecular hole injection layer, a hole transport layer, an organic luminescent layer, an electron transport layer, an electron injection layer and a cathode. Compared with the electroluminescent device of the micromolecular hole transport layer prepared by using a conventional vacuum deposition method, the organic micromolecular injection electroluminescent device causes the service life of the electroluminescent device to increase more than 10 times, which can absolutely meet the commercial application requirement of the device.

The invention discloses a two-dimensional nano carbon heating body, and a flexible electric heating module and a preparation method therefor. The two-dimensional nano carbon heating body comprises at least a membrane-shaped electric heating structure, and at least two flexible electrodes, wherein the membrane-shaped electric heating structure comprises a porous structure mainly formed by multiple layers of two-dimensional carbon nanotube networks, and the porous structure is positioned in a plane corresponding to the membrane-shaped electric heating structure; the conductivity of the membrane-shaped electric heating structure in a chosen direction is higher than the conductivity of the membrane-shaped electric heating structure in other directions different from the chosen direction; the at least two flexible electrodes are arranged at intervals in a set direction, and electrically connected with the membrane-shaped electric heating structure. The two-dimensional nano carbon heating body does not need to be combined with a substrate, so that the two-dimensional nano carbon heating body has the characteristics of lightness, thinness, ventilation and the like, and large-area preparation can be realized; therefore, when the two-dimensional nano carbon heating body is used for preparing the flexible electric heating module, characteristics of convenient cutting and processing, still high electric / thermal conversion efficiency, rapid temperature rise, uniform heating, high radiating efficiency, excellent electric heating stability and the like are achieved; and therefore, the two-dimensional nano carbon heating body is applicable to manufacturing of wearable products.

The invention discloses a solar cell and a preparation method thereof and a method for improving transmission characteristic of a perovskite layer. Conjugated organic ammonium salt is added into a DMF / DMSO solution of a perovskite precursor, and annealing and cleaning are carried out to obtain a perovskite layer thin film; and the crystal growth of the perovskite thin film is regulated and controlled by utilizing the organic conjugated ammonium salt, and the charge recombination is inhibited. According to the method, the defect of the crystallized perovskite light absorption layer thin film isobviously reduced, the carrier mobility is improved, the device conversion efficiency is improved by 20% or above, and the requirements of commercial use of devices can be fully met.

The invention discloses a super-hydrophilic coating using organic polysilazane as an anchor molecule and a preparation method thereof. The preparation method includes the steps that a preliminarily prepared organic polysilazane solution is adopted to coat the surface of a base material to form an organic polysilazane coating through a coating method; after a solvent evaporates, modified inorganicnanoparticles with reactive carbon-carbon double bonds on the surfaces are used for coating the surface, on which organic polysilazane is attached, of the base material, and through heat treatment, anorganic polysilazane / inorganic nanoparticle composite coating with reaction activity is obtained; betaine-type zwitterionic compounds with carbon-carbon double bonds are grafted onto the inorganic nanoparticles on the surface of the composite coating, and then hydrophilic modification is achieved. The water contact angle of the surface of the prepared hydrophilic modified coating is smaller than10 degrees, so that the super-hydrophilic coating has super-hydrophilic characteristics, and the coating and the surface of the base material have excellent attachment characteristics. The super-hydrophilic coating has good application effects of frogging prevention, self-cleaning, adhesion resistance of ships and underwater facility and the like.

The invention discloses a preparation method of a lead-free organic and inorganic cation common hybridization perovskite material and a film thereof. Common hybridization of BiI3 is performed by employing organic cations including methylamino or ethylamino and inorganic cations including Rb or Cs to obtain the lead-free organic and inorganic cation common hybridization perovskite material, and the lead-free organic and inorganic cation common hybridization perovskite film is prepared by employing the magnetron sputtering method. The invention relates to the field of solar photoelectric materials and semiconductor materials. According to the method, Bi replaces Pb and becomes the central ion of the perovskite material so that potential pollution of the perovskite material on the environment is avoided; besides, the perovskite material obtained by common hybridization of Bi and organic and inorganic cations has low band gaps so that electron transition is facilitated, and the photoelectric conversion efficiency is improved.

The invention belongs to the technical field of surface interface microstructure preparation equipment, in particular to a roll type ultraviolet nano-imprinting device, which includes a transfer device, coating device, rolling device, heating device and ultraviolet curing device, the transfer device includes an unwinding roller, a take-up roller and a plurality of guide rollers and is used for transferring a substrate film according to a predetermined transfer path, the coating device is used for coating an ultraviolet curing adhesive on the substrate film, the rolling device includes an imprinting roller and a pressure regulating mechanism, the outer surface of the imprinting roller is wrapped by a soft mold having a nano-structure pattern, the pressure regulating mechanism is used for controlling the imprinting roller to imprint the nano-structure pattern onto the ultraviolet curing adhesive, the heating device is used for accelerating the leveling of the ultraviolet curing adhesivecoated by the coating device, and the ultraviolet curing device is used for curing the ultraviolet curing adhesive imprinted by the rolling device. The invention can realize continuous batch preparation of surface interface microstructures, and has the advantages of low production efficiency, high manufacturing cost and high product quality.

The invention relates to the field of new materials, particularly to a high-quality graphene / two-dimensional metal carbide crystal vertical heterostructure material and a preparation method thereof. According to the preparation method, a bimetal laminate formed by a copper foil / metal foil sheet is used as a growth substrate, graphene grows at a high temperature through catalytic cracking of a carbon source by using a CVD technology, and a two-dimensional transition metal carbide crystal grows under the graphene by increasing the temperature, or graphene and a two-dimensional transition metal carbide directly grow at a temperature of higher than the melting point of copper so as to prepare a graphene / two-dimensional metal carbide vertical heterostructure; and subsequently the copper substrate is etched off to obtain the graphene / two-dimensional metal carbide vertical heterostructure. According to the present invention, the foundation is established for the research and applications of high-quality graphene / two-dimensional metal carbide vertical heterostructure in the fields of catalysis, laser detection, transparent electric-conduction films, thermal management, two-dimensional superconductivity, high transparent Josephson junctions.

The invention relates to a zinc oxide / strontium ruthenate core-shell nanowire and a preparation method thereof. The zinc oxide / strontium ruthenate core-shell nanowire comprises a zinc oxide nanowire layer constituted by a zinc oxide nanowire growing vertically and a strontium ruthenate film covered on the zinc oxide nanowire layer.

The invention relates to a method for rapidly detecting trace heavy metal ions. A related device in the method is composed of an electrolytic cell, working electrode signal channels, bismuth electrode arrays, a composite structure working electrode, a reference electrode and a counter electrode. An electrochemical stripping voltmeter-ammeter method is adopted to carry out detection. Through three bismuth electrode arrays with different structures, namely, a three-dimensional flower-shaped array, a nanowire array and a nanometer needle tip array, planar integration and three-dimensional integration are respectively achieved by the method, and an electrochemical transducer of the composite structure working electrode is constructed. The electrochemical transducer of the composite structure working electrode has the advantages of being low in manufacturing cost, high in performance, capable of achieving large-area preparation and the like. Through the electrochemical transducer, trace heavy metal in water can be detected rapidly, and the electrochemical transducer is low in cost, environment-friendly, and capable of being portable for carrying out detection. The defects that due to the fact that when the stripping voltmeter-ammeter method in the prior art is used for detecting the trace heavy metal ions, only working electrodes of one structure is used so that detection sensitivity is not high and limit of detection is not high are overcome.

The invention discloses super-clean graphene and a preparation method thereof. The preparation method of the super-clean graphene comprises the following steps: putting foam copper on a copper substrate, and attaching; leading carbon source gas and hydrogen to perform chemical vapor deposition; after deposition is completed, obtaining the super-clean graphene at the contact surface of the copper substrate and the foam copper. The preparation method has the advantages that the preparation method is simple and is suitable for large-scale production, the continuous clean area reaches the sub-centimeter level, and the preparation method is suitable for the fields of electronics, optics and the like.

The invention discloses a method for manufacturing a polycrystal perovskite thin film and a solar cell device. The method includes the steps that a mixed aqueous solution of polymer and salt is subject to wet process film formation on a substrate; and a film acts with metal halide steam mutually to be then subject to heat treatment, and the flat and compact polycrystal perovskite thin film is obtained. By means of the method, the flat and compact polycrystal perovskite thin film can be manufactured, the process is simple, crystallization is rapid, stability and the repetitive rate are high, harms to the environment are avoided, the degree of dependency to the environment is low, and the cost is low.

The invention relates to the field of a lithium battery, specifically a lithium battery cell, a lithium battery and a preparation method thereof. A current collector comprises a front positive surfaceand a negative electrode surface which are arranged oppositely, wherein a lithium oxide-containing columnar crystal positive electrode layer is formed on the positive electrode surface to be used asthe positive electrode structure of the lithium battery cell; a lithium silicon carbon composite negative electrode layer is formed on the negative electrode layer; by taking the lithium oxide-containing columnar crystal with high voltage and high capacity characteristics as the positive electrode material, the high capacity density lithium battery cell and lithium battery can be obtained; by setting positive and negative electrodes of two different lithium battery cell units on the two surfaces of the current collector, the current collectors with shared positive and negative electrodes are formed, so that stacking preparation of multiple lithium battery cell units can be realized, thereby realizing preparation of the high capacity lithium battery; and the current collector also can be directly used as an external electrode of the lithium battery, so that the packaging structure of the lithium battery can be simplified.

The invention discloses a perovskite hybrid solar cell based on a cadmium sulfide nanoarray. The perovskite hybrid solar cell comprises a substrate, a transparent metal electrode layer, an inorganic electron transport layer, a photosensitive layer, a hole transport layer and a metal electrode layer; the transparent metal electrode layer, the inorganic electron transport layer, the photosensitive layer, the hole transport layer and the metal electrode layer are orderly arranged on the substrate from bottom to top; the inorganic electron transport layer is formed from the cadmium sulfide nanoarray; the form of the cadmium sulfide nanoarray is nanorod, nanowire or nanotube. The perovskite hybrid solar cell is characterized in that the cadmium sulfide nanoarray is taken as the electron transport layer material instead of high-temperature sintered metal oxides widely used at present, and has relatively small band gap width and is relatively wide in an absorption spectrum to sunlight; the interface area of the electron transport layer material and the material of the photosensitive layer is increased and a continuous electron transport channel is provided; compared with high temperature sintering, the perovskite hybrid solar cell has the advantages of low cost, low energy consumption and easily realizable large-area preparation.

The invention discloses a method for growing single-layer and multi-layer transition metal sulfides through alternating injection of reactants. By the adoption of the method, deposition reaction of the reactants is achieved alternately, the number of layers and area of grown transition metal sulfides are controlled by controlling reaction temperature and time, and layered transition metal sulfides high in quality are obtained. The method has the advantages that growth condition is accurate and controllable, operation is easy and convenient, and large-area preparation of transition metal sulfides can be achieved. The method has broad application prospects in fields such as nano-electronical appliances, lubricating materials and photocatalysis.

The invention belongs to the technical field of bionic super-smooth coating layers, and particularly relates to a rough substrate for a smooth porous surface infused with lubricating liquid, the smooth porous surface infused with the lubricating liquid and preparation methods of the rough substrate and the smooth porous surface. The invention provides the preparation method of the rough substrate with the smooth porous surface infused with the lubricating liquid, wherein the preparation method comprises the steps: mixing epoxy resin with diethylenetriamine to prepare a mixture; coating a base material with the mixture to prepare a composite base material; and placing the composite base material in an environment with the relative humidity of 60%-95%, and curing to obtain the rough substrate for the smooth porous surface infused with the lubricating liquid. The invention provides the rough substrate for the smooth porous surface infused with the lubricating liquid, the smooth porous surface infused with the lubricating liquid and the preparation methods of the rough substrate and the smooth porous surface, and can effectively overcome the technical defects that a low-surface-energy polymer of SLIPS is poor in adhesiveness with the substrate and unstable in mechanical property.

The invention discloses a panchromatic Micro-LED array display and white light device based on III-nitride / organic semiconductor hybrid structure, which mixes inorganic and organic light emitting diode devices to obtain high-efficiency ultra-high-resolution active Micro-LED display and lighting source. A red-light, green-light or yellow-light organic material is evaporated on an N-type gallium nitride layer of a InxGa1-xN / gallium nitride quantum well blue-light LED epitaxial wafer having a p-n structure, respectively, and an electron transport layer, a luminescent layer, an exciton blocking layer, a hole transport layer and a hole injection layer are included in sequence; and when one of the groups of materials is evaporated, other pixels are shielded using a shielding mask. The technologycombines the organic semiconductor material and inorganic semiconductor material, and can realize a novel inorganic / organic semiconductor hybrid structure Micro-LED device array which has the characteristics of high efficiency, wide color gamut, low power consumption and fast response time.

The invention discloses a CuZnSnS-perovskite-based planar heterojunction solar cell and a manufacturing method thereof. The solar cell comprises a substrate, a transparent conducting layer, a CuZnSnS layer, a perovskite layer, an electron transport layer and a metal electrode layer from bottom to top respectively. In a cell structure disclosed by the invention, the CuZnSnS layer is taken as a hole transport layer in the cell instead of a common organic material, and a charge layer is low in material price, environmentally friendly, high in material stability, high in charge mobility, well matched with a perovskite absorbing layer in energy level and process and easy to prepare over a large area, and has a wide industrial application prospect.

A preparation method of a ternary ZnSnS film is characterized in that: glass, ceramic or a silicon chip plated with metal film are taken as an electrode to form a substrate material with the electrode or an ITO substrate is used, and a pulse potentiometry is used to perform electrodeposition in an electrolyte after being cleaned, wherein the temperature of the electrolyte is from a room temperature to 45 DEG C and an electrodeposition process comprises: clamping the substrate with the electrode or the ITO substrate on a cathode which is a working electrode and immersing into the electrolyte; parameters of adjusting the pulse potentiometry include: an open potential is minus 1.0V- minus 1.2 V; opening time is 10s; a turn-off potential is not 0V but minus 0.6V during deposition; turn-off time is 10S; the electrodeposition process is repeated or a corresponding pulse frequency is increased so as to obtain a needed thickness. In the invention, the pulse electrodeposition preparation method is improved. A related film can be acquired through one step. Equipment and the preparation process are simple. Large-area preparation can be realized and costs are low.

The invention discloses a preparation method of a high-sensitivity surface-enhanced Raman scattering substrate and belongs to the field of application of spectral molecular detection materials. According to the method, a series of oxygen vacancy energy levels are introduced into a semiconductor bandgap by means of ion beam irradiation, photo-excited charge between the energy levels in the semiconductor bandgap and a matched molecular energy level can be transferred more efficiently, and molecular Raman signal intensity of a detection material is improved greatly; by combining ion beam irradiation and vacuum annealing, molecular Raman signal intensity is further increased, highest sensitivity in all semiconductor materials internationally reported at present is acquired, and it is even possible for the detection material to compare with non-hot-spot noble metal materials in terms of property. Compared with other preparation methods, the preparation method of the invention has the greatest advantages that the technique is mature and suitable for industrial production, large-scale preparation of high-sensitivity non-metallic surface-enhanced Raman scattering substrate materials is available, the prepared product has low cost, and detection signals are stable and uniform.

The invention relates to a coil-shaped thermoelectric unit, a fabric structure thermoelectric device, and preparation and application thereof. The thermoelectric unit is composed of a horizontal column formed by a plurality of coils connected in series in the latitudinal direction, and is composed of a circularly alternate coil horizontal column, wherein each coil is a thermoelectric yarn coil containing a P-shaped segment, an N-shaped segment, and an electrode segment. The output power density of the device can be adjusted conveniently by changing the length of the coil and the thickness of awrapping layer. The thermoelectric device designed in the invention can realize power generation in the direction of temperature difference between a human body and the environment, has two-way stretching performance, is not required to be supported by any other textile-based material, solves the problem of thermoelectric unit configuration direction faced by most flexible thermoelectric devicesat present, has wearable and independent energy functions, can be directly used for batched and large-area textile and garment processing and production, and greatly promotes the practical applicationof the thermoelectric devices in energy supply.

The invention discloses a preparation method of a silicon nanowire array with excellent field emission performance and a tip structure, and belongs to the technical field of field emission. The method comprises the following steps: firstly configuring single-layered PS (Polystyrene) spheres densely on a silicon substrate, carrying out reactive ion etching treatment on the PS spheres, adopting an electron beam evaporation method to plate silver, removing the PS spheres, carrying out silver catalytic corrosion to the substrate, and obtaining the silicon nanowire array with larger diameter; adopting a dry-method oxidation treatment to turn the silicon nanowires into the tip structure, further reducing the diameter of the silicon nanowires, and increasing the space between the silicon nanowires. The silicon nanowire array with the tip structure, prepared with the method, is of excellent field emission performance; the threshold voltage of the silicon nanowire array is 1.8 V per microns; the current stability is good; meanwhile, the single crystal performance of the silicon nanowires is good, so that the silicon nanowires can be regularly and densely configured in a large area, and the controllability of the draw ratio is strong. The method is low in cost, high in yield and good in controllability, so as to be applied to production of silicon-substrate field emission electronic devices.

The invention discloses an organic light emission diode, a display screen and a terminal. The organic light emission diode includes a transmitting substrate, an anode layer, an organic function layer and a cathode layer, which are sequentially laminated and combined. The cathode layer includes a metal reflection layer, at least two interference layers and at least two transflective metal layers. The interferences layers and the transflective metal layers are alternatively laminated and combined between the metal reflection layer and the organic function layer. The interference layers and the metal reflection layers are laminated and combined. The transflective metal layer and the organic function layer are laminated and combined, wherein the material of the interference layers includes an organic electron transmission material and an alkali metal compound doped therein, and the mass of the alkali metal compound is 5-50% of the total mass of the interference layers. The cathode of the organic light emission diode effectively reduces a light reflectivity of the cathode of the organic light emission diode and improves the contrast ratio thereof. The display screen which includes the organic light emission diode, and the terminal have high contrast ratios and clear display pictures.

The present invention discloses an AlGaN heterojunction nano-pillar array light emitting device, whose structure comprises the following components that are sequentially arranged in the order from the bottom to the top: a substrate; a GaN buffer layer grown on the substrate; an AlN insertion layer grown on the GaN buffer layer; an AlxGa1-xN layer grown on the AlN insertion layer; and an etched nano-pillar array penetrating from the AlxGa1-xN layer, the AlN insertion layer and deeply into the GaN buffer layer. In the nano-pillar array, the diameter of the AlxGa1-xN layer is smaller than that of the AlN insertion layer. The invention also discloses a preparation method for the AlGaN heterojunction nano-pillar array light emitting device. According to the invention, through the use of a nano-pillar array structure of the invention, the stress in the heteroepitaxial film is released and the luminous efficiency of the device is increased; and through the change of the array structure parameters, the distribution of the light field can be adjusted, and the extraction efficiency for the ultraviolet light is increased. The utilization of the optimized three-layer UV flexible imprinting technology overcomes the defect caused by the surface roughness of the AlGaN epitaxial wafer; and the edge of the imprinted pattern is smooth and without serration, and the shape and the diameter of the nano-pillar array can be adjusted, and the structure can be transferred.

The invention discloses a terahertz wave-absorbing material with a gradient pore size structure, and belongs to the technical field of terahertz wave absorption. The wave-absorbing material comprisesthree layers of three-dimensional graphene / PDMS composite materials, wherein the pore size range of the three-dimensional graphene on the uppermost layer is 100-120 [mu]m, the pore size range of the three-dimensional graphene in the middle is 50-70 [mu]m, and the pore size range of the three-dimensional graphene on the lowermost layer is 20-40 [mu]m. The terahertz wave-absorbing material disclosedby the invention has an extremely strong broadband terahertz wave absorption characteristic, and the average absorption rate in an ultra-wideband frequency spectrum range of 0.2-1.2 THz is as high as93% or above; the terahertz wave-absorbing material has ultrathin thickness, and the thickness of each layer is controlled within 1mm, so that the total thickness of the terahertz wave-absorbing material is within 3 mm, which is far superior to that of existing terahertz wave-absorbing foam materials; the terahertz wave-absorbing material has extremely good flexible characteristics such as bendability, stretchability and mechanical elasticity; raw materials are cheap, the preparation method is simple, and large-area preparation can be realized.

The invention belongs to a preparation method of a thin film material, and particularly relates to a post-repair method of a formamidino perovskite thin film through a post-gas repair mode. The methodcomprises the following steps: treating a formamidino perovskite (the structural formula is ABX3) initial film in ammonia gas, mixed gas containing the ammonia gas or a solution containing the ammonia gas for 0.1-30 minutes at 0-100 DEG C, thereby improving the uniformity of the formamidino perovskite film; introducing ammonia gas into the precursor solution forming the initial thin film to directly prepare the high-uniformity formamidino perovskite thin film. Compared with an evaporation method and a continuous deposition method, the process in the method is advantageous in that the processis easier to operate, low in cost and suitable for large-scale production; compared with an existing one-step solution method, the method has the advantages that large-area preparation can be achieved, and high crystallization quality is achieved; then the obtained film can be qualified for various device structures such as mesoporous and planar perovskite solar cells, diodes and lasers.

The invention discloses a method for preparing a large-area monocrystal Cu (111). The method comprises is characterized in that a polycrystalline copper foil is treated several times to obtain the monocrystal Cu (111); every treatment successively comprises polishing and annealing; and the treatment frequency is not less than 3, and specifically is 3 or 4. The crystal faces of the copper foil obtained by the method are all (111) faces, and the area of the monocrystal Cu (111) is limited only by the size of a preparation container, so the method realizes large-area preparation of the monocrystal Cu, and has great application values.