Perovskite nanosheet light-controlled sequencing method and sequenced perovskite nanosheet

Abstract

The invention provides a method for optically-controlled sequencing of a perovskite nanosheet and a sequenced perovskite nanosheet. The perovskite nanosheet light-controlled sequencing method comprises the following steps: providing a perovskite nanosheet solution; performing laser irradiation on the perovskite nanosheet solution, and performing phase change on the perovskite nanosheets to obtain a phase change perovskite nanosheet mixed solution; and standing the phase change perovskite nanosheet mixed solution, and carrying out sequencing on the perovskite nanosheets after phase change to obtain the sequenced perovskite nanosheets. The method is simple and rapid in process and convenient for industrial application; the method has very high universality in two-dimensional perovskite and quasi-two-dimensional perovskite; the method does not depend on external force or foreign objects, thereby avoiding the performance influence of the external force or foreign objects on the perovskite, and facilitating the improvement of the stability of the sequential structure. The morphology of the sequential structure can be fully regulated and controlled; a heterogeneous sequential structure can be realized by selecting various two-dimensional or quasi-two-dimensional perovskite, so that new physical and chemical properties are obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, in particular to a method for photo-controlling the ordering of perovskite nanosheets and ordered perovskite nanosheets. BACKGROUND

[0002] Two-dimensional halide perovskite is a typical direct band gap semiconductor material with good photoelectric performance. Perovskite has rapidly become a research hotspot due to its excellent physical and chemical properties and has been widely studied in the fields of light-emitting diodes, solar cells and the like.

[0003] Perovskite ordering is the orderly stacking of perovskite structure units with specific functions in a precise spatial arrangement, or in other words, the ordering of perovskite refers to the long-range ordered arrangement of the crystal structure, crystal face arrangement or functional units of perovskite materials by specific methods and technologies to optimize their performance. The development of this technology is a key link to further expand the performance of perovskite and expand its application range. At present, the mainstream technologies for ordering perovskite nanosheets include evaporation-driven method, external force-assisted method and light-removing ligand method. Among them, the evaporation-driven method can achieve large-scale assembly, but its assembly speed is slow and often requires a long time scale. In addition, its mechanism is not fully studied and the self-assembly process is not very controllable. The assembly speed of the external force-assisted method is greatly improved, but it depends on the selection of templates and its current application is limited to one-dimensional perovskite ordering. The light-removing ligand method is a method with fast speed and wide application in various morphologies of perovskite ordering, but it requires high-quality ligands and is unstable in the environment and easily changes into bulk materials. Overall, the current methods all have problems affecting the quality of the ordered products and their application range. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art. To this end, one object of the present application is to provide a method for photo-controlling the ordering of perovskite nanosheets, which is simple and easy to apply in industry.

[0005] In one aspect, the present invention provides a method for photocontrolled sequencing of perovskite nanosheets. According to an embodiment of the present invention, the method for photocontrolled sequencing of perovskite nanosheets includes: providing a perovskite nanosheet solution; irradiating the perovskite nanosheet solution with a laser, causing a phase transition in the perovskite nanosheets to obtain a phase-transformed perovskite nanosheet mixture; allowing the phase-transformed perovskite nanosheet mixture to stand; and then performing sequencing on the phase-transformed perovskite nanosheets to obtain ordered perovskite nanosheets. Therefore, the above-mentioned ordering method is simple, rapid, and easy to apply in industry; it has strong universality in two-dimensional perovskites and quasi-two-dimensional perovskites, and has great application value; this ordering method does not depend on external forces or objects, thus avoiding the performance impact of external forces or objects on two-dimensional perovskites and quasi-two-dimensional perovskites, and helps to improve the stability of the ordered structure; this ordering method makes full use of the tunability of light, and the length of the assembled sample can be controlled by adjusting parameters, so as to fully regulate the morphology of the ordered structure; this ordering method can achieve heterogeneous ordered structures by selecting a variety of two-dimensional or quasi-two-dimensional perovskites, thereby obtaining new physicochemical properties.

[0006] According to an embodiment of the present invention, the laser is an ultraviolet laser.

[0007] According to an embodiment of the present invention, the wavelength of the ultraviolet laser is less than or equal to 520 nm, preferably, the wavelength of the ultraviolet laser is 365 nm, and / or, the laser is a femtosecond laser, a picosecond laser, or a continuous laser.

[0008] According to an embodiment of the present invention, the laser irradiation time is 1 to 30 minutes.

[0009] According to an embodiment of the present invention, the power of the laser irradiation is 10~5000μW.

[0010] According to an embodiment of the present invention, the settling temperature is 20~40°C and the time is 1~24 hours.

[0011] According to an embodiment of the present invention, the concentration of the perovskite nanosheet solution is 0.01~0.1 mol / L.

[0012] According to an embodiment of the present invention, the perovskite nanosheet is a two-dimensional perovskite nanosheet or a quasi-two-dimensional perovskite nanosheet.

[0013] According to an embodiment of the present invention, the above method further includes: evaporating the solvent in the settled solution to obtain the ordered perovskite nanosheets.

[0014] In another aspect, the present invention provides ordered perovskite nanosheets. According to an embodiment of the present invention, the ordered perovskite nanosheets are prepared by the method described above. Thus, the ordered structure of the ordered perovskite nanosheets is stable and the morphology is tunable.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a flowchart of a method for photo-controlled sequencing of perovskite nanosheets in one embodiment of the present invention; Figure 2 This is a process diagram of the photo-controlled sequencing of perovskite nanosheets in another embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of perovskite PEA2PbI4 nanosheets; Figure 4 This is a scanning electron microscope image of the two-dimensional perovskite PEA2PbI4 nanosheet-structured structure in Example 1; Figure 5 This is a scanning electron microscope image of the two-dimensional perovskite PEA2PbI4 nanosheet sequence structure in Example 2; Figure 6 This is a scanning electron microscope image of the two-dimensional perovskite PEA2PbI4 nanosheet sequence structure in Example 3; Figure 7 This is a schematic diagram of the structure of perovskite PEA2MAPb2I7 nanosheets; Figure 8 This is a scanning electron microscope image of the heterogeneous perovskite nanosheet ordered structure in Example 5. Detailed Implementation

[0017] The present invention will be explained below with reference to embodiments. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0018] The present invention will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the present invention in any way.

[0019] In one aspect, the present invention provides a method for the photo-controlled sequencing of perovskite nanosheets. According to an embodiment of the present invention, referring to… Figure 1 Methods for the photocontrolled sequencing of perovskite nanosheets include: S100: Provides perovskite nanosheet solutions.

[0020] According to some embodiments of the present invention, the perovskite nanosheets are two-dimensional perovskite nanosheets or quasi-two-dimensional perovskite nanosheets.

[0021] In some specific embodiments, the general formula of the two-dimensional perovskite nanosheet material is X2YI4 or X3Y'I6, where X is any one of the organic ammonium ions containing a benzene ring, such as aniline, phenethylamine, or benzylamine, Y is a Pb atom, and Y' is a Bi atom. In some specific examples, the two-dimensional perovskite nanosheets are PEA2PbI4, An2PbI4, PEA3BiI6, etc.

[0022] In some specific embodiments, the general formula of the quasi-two-dimensional perovskite nanosheet material is X2X'. n-1 Pb n I 3n+1 In this context, X is any one of the organic ammonium ions containing a benzene ring, such as aniline, phenethylamine, or benzylamine; X' is any one of the organic amine ions with a carbon chain length of less than five carbon atoms, such as methylamine or formamidinium. In some specific examples, the quasi-two-dimensional perovskite nanosheets are PEA2MAPb2I7.

[0023] According to some embodiments of the present invention, the concentration of the perovskite nanosheet solution is 0.01~0.1 mol / L, such as 0.01 mol / L, 0.02 mol / L, 0.03 mol / L, 0.04 mol / L, 0.05 mol / L, 0.06 mol / L, 0.07 mol / L, 0.08 mol / L, 0.09 mol / L, 0.1 mol / L, etc. Perovskite nanosheets with the above concentrations can better and more uniformly receive subsequent laser irradiation.

[0024] According to some embodiments of the present invention, there are no special requirements for the preparation method of perovskite nanosheet solution. Those skilled in the art can design it flexibly according to existing technical means, and no restrictions are imposed here.

[0025] S200: Laser irradiation is applied to the perovskite nanosheet solution to induce a phase transition in the perovskite nanosheets, resulting in a phase-transformed perovskite nanosheet mixture.

[0026] According to an embodiment of the present invention, under laser excitation at a wavelength absorbable by the perovskite material, the perovskite undergoes electronic transitions to generate electron-hole pairs, causing lattice distortion and resulting in a metastable ferroelectric phase. Subsequently, ordering occurs under the drive of dipole-dipole interactions, and the ordered structure is maintained by hydrogen bonds and Π-Π bonds, thus achieving the universal application of the ordered structure. After the ordering is completed, the ferroelectricity disappears, and hydrogen bonds and Π-Π bonds become the forces maintaining the ordered structure, thereby preserving the ordered structure.

[0027] For example, in lead- and iodine-containing perovskite materials, laser excitation causes distortion of the lead-iodine octahedrons in the perovskite, which in turn leads to distortion of the organic part and preserves this distortion. The structural symmetry breaking brings a certain degree of ferroelectricity. Then, under the drive of dipole-dipole interactions, ordering occurs, and the ordered structure is maintained by hydrogen bonds and π-π bonds. After the ordering is completed, the ferroelectricity disappears, and hydrogen bonds and π-π bonds become the forces that maintain the ordered structure, thus preserving the ordered structure of the perovskite material.

[0028] In some specific embodiments, taking PEA2PbI4 perovskite nanosheets as an example, the process of their ordered structure formation by laser irradiation is as follows: Figure 2 As shown, PEA2PbI4 perovskite nanosheets are in a disordered state before irradiation. After laser excitation, the PEA2PbI4 perovskite nanosheets undergo a phase transition and become ordered. The distortion of the lead-iodine octahedrons in the perovskite drives the distortion of the organic part and retains this distortion. The structural symmetry breaking brings a certain degree of ferroelectricity. Subsequently, ordering occurs under the drive of dipole-dipole attraction. After the ordering is completed, the ferroelectricity disappears, and the ordered structure of the perovskite nanosheets is maintained through hydrogen bonds and π-π bonds. Figure 2 In this context, D refers to the spacing between perovskite nanosheets, and d refers to the spacing between different layers of octahedra within a single perovskite nanosheet.

[0029] According to some embodiments of the present invention, the laser is an ultraviolet laser. Thus, the ultraviolet laser can better excite and induce electron transitions in the perovskite to generate electron-hole pairs, causing lattice distortion in the perovskite material and subsequently producing a metastable ferroelectric phase, which then undergoes ordering driven by dipole-dipole interactions.

[0030] According to some embodiments of the present invention, the wavelength of the ultraviolet laser is less than or equal to 520 nm. In some specific embodiments, the wavelength of the ultraviolet laser is 365 nm. Therefore, ultraviolet lasers at the aforementioned wavelengths can effectively excite and induce electron transitions in perovskites, generating electron-hole pairs, causing lattice distortion in the perovskite material, and subsequently producing a metastable ferroelectric phase, followed by ordering driven by dipole-dipole interactions. Furthermore, the technical solution of the present invention has a broad range of requirements for the ultraviolet laser, thereby reducing the stringency of the ordering requirements for perovskite nanosheets.

[0031] According to some embodiments of the present invention, the laser irradiation time is 1 to 30 minutes, for example, irradiation times of 1 minute, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, etc. Thus, the above-mentioned irradiation time allows the laser to fully act on the perovskite nanosheets, causing all perovskite nanosheets to undergo electronic transitions to generate electron-hole pairs, resulting in lattice distortion of the perovskite material and the formation of a metastable ferroelectric phase. Subsequently, ordering occurs under the drive of dipole-dipole interactions. This avoids situations where some or all perovskite nanosheets fail to undergo electronic transitions to generate electron-hole pairs, thus preventing lattice distortion and hindering ordering.

[0032] According to some embodiments of the present invention, the power of laser irradiation is 10~5000μW, such as 10μW, 50μW, 100μW, 300μW, 500μW, 800μW, 1000μW, 1500μW, 2000μW, 2500μW, 3000μW, 3500μW, 4000μW, 4500μW, 5000μW, etc. Thus, lasers of the aforementioned power levels can fully exert their influence on perovskite nanosheets, enabling effective electron transitions to generate electron-hole pairs, resulting in effective lattice distortion of the perovskite material, thereby generating a metastable ferroelectric phase, which then undergoes ordering driven by dipole-dipole interactions.

[0033] According to some embodiments of the present invention, the laser is a femtosecond laser, a picosecond laser, or a continuous laser. This allows for better control of laser parameters and better realization of perovskite ordering.

[0034] S300: The phase-change perovskite nanosheet mixture is allowed to stand, and the phase-change perovskite nanosheets are then ordered to obtain ordered perovskite nanosheets. The standing process provides sufficient time for the ordering of the perovskite nanosheets, achieving complete ordering.

[0035] According to some embodiments of the present invention, the settling temperature is 20~40℃ (e.g., temperatures of 20℃, 23℃, 25℃, 28℃, 30℃, 32℃, 35℃, 38℃, 40℃, etc.), and the time is 1~24 hours (e.g., 1 hour, 3 hours, 5 hours, 8 hours, 10 hours, 12 hours, 15 hours, 18 hours, 20 hours, 24 hours, etc.). This provides sufficient time for the perovskite nanosheets to undergo ordering, thus avoiding incomplete ordering.

[0036] According to some embodiments of the present invention, the above method further includes: evaporating the solvent in the settled solution (i.e., the solution after the sequential formation process is completed) to obtain sequentially formed perovskite nanosheets.

[0037] According to embodiments of the present invention, the above-described ordering method is simple, rapid, and easy to apply in industry; the ordering method has strong universality in two-dimensional perovskites and quasi-two-dimensional perovskites, and has great application value; the ordering method does not depend on external forces or objects, thereby avoiding the performance influence of external forces or objects on two-dimensional perovskites and quasi-two-dimensional perovskites, and helps to improve the stability of the ordered structure; the ordering method makes full use of the tunability of light, and the length of the assembled sample can be controlled by adjusting parameters, so as to fully regulate the morphology of the ordered structure; the obtained ordered structure has various morphological tunability such as length, angle, and thickness; the ordering method can achieve heterogeneous ordered structures by selecting various two-dimensional or quasi-two-dimensional perovskites, thereby obtaining new physicochemical properties.

[0038] In another aspect, the present invention provides ordered perovskite nanosheets. According to embodiments of the present invention, the ordered perovskite nanosheets are prepared by the method described above. Thus, the ordered structure of the ordered perovskite nanosheets is stable and the morphology is tunable. Those skilled in the art will understand that the ordered perovskite nanosheets possess all the features and advantages of the methods described above, which will not be elaborated further here.

[0039] Example Example 1 (1) Take 0.8 mmol of PEAI and 0.4 mmol of PbI2 and add them to 10 ml of acetonitrile. After dissolving them completely, the two-dimensional perovskite PEA2PbI4 precursor is obtained.

[0040] (2) Add 50 μl of the precursor to the toluene solution of the antisolvent in the magnetic stirrer to obtain a two-dimensional perovskite PEA2PbI4 nanosheet solution. The schematic diagram of the two-dimensional perovskite PEA2PbI4 nanosheet structure is shown in the figure. Figure 3 .

[0041] (3) Adjust the wavelength of the UV light to 365nm, the power to 500μW, and set the UV light irradiation time to 10min. Use the UV light to irradiate the two-dimensional perovskite PEA2PbI4 nanosheet solution to cause a phase transition in PEA2PbI4.

[0042] (4) The solution after UV irradiation was placed in a constant temperature environment of 30°C, so that the PEA2PbI4 nanosheets after phase transformation attracted each other to form a perovskite ordered structure.

[0043] (5) After the ordering process is completed, the precipitate dispersed in the solution is dropped onto a clean silicon substrate. After the solution evaporates, the PEA2PbI4 ordering structure is obtained, as shown below. Figure 4 As shown.

[0044] Example 2 (1) Take 0.8 mmol of AnI and 0.4 mmol of PbI2 and add them to 10 ml of acetonitrile. After dissolving them completely, the two-dimensional perovskite An2PbI4 precursor is obtained.

[0045] (2) Add 50 μl of the precursor to the toluene solution of the antisolvent in the magnetic stirrer to obtain a two-dimensional perovskite An2PbI4 nanosheet solution.

[0046] (3) Adjust the wavelength of the UV light to 365nm, the power to 500μW, and set the UV light irradiation time to 10min. Use the UV light to irradiate the two-dimensional perovskite An2PbI4 nanosheet solution to cause An2PbI4 to undergo a phase transition.

[0047] (4) The solution after UV irradiation was placed in a constant temperature environment of 30°C, so that the An2PbI4 nanosheets after phase transformation attracted each other to form a perovskite ordered structure.

[0048] (5) After the ordering process is completed, the precipitate dispersed in the solution is dropped onto a clean silicon substrate. After the solution evaporates, the An2PbI4 ordering structure is obtained, as shown below. Figure 5 As shown.

[0049] Example 3 (1) Take 0.9 mmol of PEAI and 0.3 mmol of BiI2 and add them to 10 ml of acetonitrile. After dissolving them completely, the two-dimensional perovskite PEA3BiI6 precursor is obtained.

[0050] (2) Add 50 μl of the precursor to the toluene solution of the antisolvent in the magnetic stirrer to obtain a two-dimensional perovskite PEA3BiI6 nanosheet solution.

[0051] (3) Adjust the wavelength of the UV light to 365nm, the power to 500μW, and set the UV light irradiation time to 10min. Use the UV light to irradiate the two-dimensional perovskite PEA3BiI6 nanosheet solution to cause a phase transition in PEA3BiI6.

[0052] (4) The solution after UV irradiation was placed in a constant temperature environment of 30°C, so that the PEA3BiI6 nanosheets after phase transformation attracted each other to form a perovskite ordered structure.

[0053] (5) After the sequencing process is completed, the precipitate dispersed in the solution is dropped onto a clean silicon substrate. After the solution evaporates, the PEA3BiI6 sequenced structure is obtained, as shown below. Figure 6 As shown.

[0054] Example 4 (1) Take 0.6 mmol of PEAI, 0.3 mmol of MAI and 0.6 mmol of PbI2 and add them to 10 ml of acetonitrile. After dissolving them completely, the precursor of quasi-two-dimensional perovskite PEA2MAPb2I7 is obtained.

[0055] (2) Add 50 μl of the precursor to the toluene solution of the antisolvent in the magnetic stirrer to obtain a quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheet solution. The structural schematic diagram of the quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheet is shown in the figure. Figure 7 .

[0056] (3) Adjust the wavelength of the UV light to 365nm, the power to 500μW, and the UV light irradiation time to 10min. Use the UV light to irradiate the quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheet solution, so that the quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheet undergoes a phase transition.

[0057] (4) The solution after UV irradiation was placed in a constant temperature environment of 30°C, so that the quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheets after phase transformation attracted each other to form a perovskite ordered structure.

[0058] (5) After the sequencing process is completed, the precipitate dispersed in the solution is dropped onto a clean silicon substrate. After the solution evaporates, the quasi-two-dimensional perovskite PEA2MAPb2I7 sequenced structure is obtained.

[0059] Example 5 (1) Take 0.8 mmol of PEAI and 0.4 mmol of PbI2 and add them to 10 ml of acetonitrile. After dissolving them completely, the two-dimensional perovskite PEA2PbI4 precursor is obtained; take 0.6 mmol of PEAI, 0.3 mmol of MAI and 0.6 mmol of PbI2 and add them to 10 ml of acetonitrile. After dissolving them completely, the quasi-two-dimensional perovskite PEA2MAPb2I7 precursor is obtained.

[0060] (2) Take 50 μl of each of the above two precursors and add them to the toluene solution of the antisolvent in two bottles of magnetic stirring to obtain two-dimensional perovskite PEA2PbI4 nanosheet solution and quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheet solution, respectively. The structural schematic diagram of quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheet is shown in the figure. Figure 7 .

[0061] (3) The above two-dimensional perovskite PEA2PbI4 nanosheet solution and the quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheet solution are uniformly mixed to obtain a nanosheet mixture.

[0062] (3) Adjust the wavelength of the UV light to 365nm, the power to 500μW, and set the UV light irradiation time to 10min. Use the UV light to irradiate the nanosheet mixture, so that the two-dimensional perovskite PEA2PbI4 nanosheets and the quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheets in the nanosheet mixture undergo phase transition.

[0063] (4) The solution after UV irradiation was placed in a constant temperature environment of 30°C, so that the two-dimensional perovskite PEA2PbI4 nanosheets and the quasi-two-dimensional perovskite PEA2MAPb2I7 nanosheets after phase transformation formed a mixed perovskite ordered structure.

[0064] (5) After the ordering process is completed, the precipitate dispersed in the solution is dropped onto a clean silicon substrate. After the solution evaporates, the ordered structure of the heterogeneous perovskite nanosheets is obtained, such as... Figure 8 As shown, the right image is a scanning electron microscope (SEM) image of a layered structure tilted at 70°.

[0065] The terms "first" and "second" used in this document are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for photo-controlling the self-assembly of perovskite nanosheets, characterized in that, The method comprises the following steps: providing a perovskite nanosheet solution; laser irradiating the perovskite nanosheet solution, phase transition of the perovskite nanosheet, to obtain a phase transition perovskite nanosheet mixture; standing the phase transition perovskite nanosheet mixture, and performing sequence construction on the phase transition perovskite nanosheet, to obtain a sequence constructed perovskite nanosheet.

2. The method of claim 1, wherein, The laser is an ultraviolet laser.

3. The method of claim 2, wherein, The wavelength of the ultraviolet laser is less than or equal to 520 nm, preferably, the wavelength of the ultraviolet laser is 365 nm. And / or, the laser is a femtosecond laser, a picosecond laser or a continuous laser.

4. The method according to any one of claims 1 to 3, characterized in that, The time of the laser irradiation is 1-30 minutes.

5. The method of any one of claims 1-3, wherein, The power of the laser irradiation is 10-5000 μW.

6. The method of any one of claims 1-3, wherein, The standing temperature is 20-40 ℃, and the time is 1-24 hours.

7. The method of any one of claims 1-3, wherein, The concentration of the perovskite nanosheet solution is 0.01-0.1 mol / L.

8. The method of any one of claims 1-3, wherein, The perovskite nanosheet is a two-dimensional perovskite nanosheet and / or a quasi-two-dimensional perovskite nanosheet.

9. The method of any one of claims 1-3, wherein, The method comprises the following steps: evaporating the solvent in the standing solution, to obtain the sequence constructed perovskite nanosheet.

10. An ordered perovskite nanosheet, characterized in that, The sequence constructed perovskite nanosheet is prepared by the method in any one of claims 1-9.

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