CN116623271A - mPhDMADPbI 4 Two-dimensional perovskite single crystal and preparation method thereof - Google Patents
mPhDMADPbI 4 Two-dimensional perovskite single crystal and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 32
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- 101710065039 Aladin Proteins 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/08—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions by cooling of the solution
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/54—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
- C30B29/64—Flat crystals, e.g. plates, strips or discs
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/14—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions the crystallising materials being formed by chemical reactions in the solution
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Abstract
The invention provides an mPDMADPbI 4 The preparation method adopts an aqueous solution method and a variable rate gradient cooling composite method, and specifically comprises the following steps: (1) mPDMADPbI 4 Preparing a precursor solution: taking a certain amount of mPDMADI respectively 2 And PbI 2 Placing in a glass bottle, and removing HI and H 3 PO 2 Placing in the glass bottle; (2) mPDMADPbI 4 Preparation of two-dimensional perovskite single crystals: placing the glass bottle on a heating table, heating until the glass bottle is fully dissolved, and then obtaining mPDMADPbI after crystals are separated out by a variable rate gradient cooling method 4 Two-dimensional perovskite single crystals. According to the invention provideThe preparation method avoids the problem of incomplete conversion in the preparation process, and can efficiently prepare high-quality DJ-phase two-dimensional perovskite mPDMADPbI 4 The invention grows a single crystal material based on mPDMADDI for the first time 2 The DJ phase two-dimensional perovskite single crystal of the (B) improves the purity of crystal growth.
Description
Technical Field
The invention relates to a synthesis method of a novel perovskite material in the photoelectric field, in particular to a method for synthesizing mPDMADPbI 4 A two-dimensional perovskite single crystal and a preparation method thereof.
Background
Perovskite materials have been attracting attention over the past decades for their unique physicochemical properties such as low band gap, high absorption coefficient, long charge carrier diffusion length, long charge carrier lifetime, and high charge carrier mobility. At present, the most hot research of perovskite materials is that in the photovoltaic field, the energy conversion efficiency of perovskite solar cells is as high as 25.8%. Although three-dimensional perovskite has obtained superior performance in solar cell, photonics, diode, laser, etc., the poor stability and short lifetime of three-dimensional perovskite devices under water oxygen and solar light due to ion migration and change of surface morphology with time have hindered the commercialization process.
Aiming at the 2D perovskite, the perovskite has good environmental stability and has good application prospect in solar cells, light-emitting diodes and other optoelectronic devices. Common 2D perovskite formulas include: s'. 2 A n-1 M n X 3n+1 (RP) or SA n-1 M n X 3n+1 (DJ) wherein S 'and S are monovalent and divalent organic cations, respectively, and S' is most commonly an ammonium cation (RNH 3+ ) Including PEA, BA, PA, PMA, etc., the RP phase perovskite layers are mainly bonded together with hydrogen bonds through van der waals forces, S includes BDA, PDMA, PMEA, etc., the DJ phase perovskite layers are mainly bonded together with hydrogen bonds, and are classified according to the number of inorganic perovskite layers (n=1, 2, 3, 4, etc.). The monovalent organic layer has an offset per cell. The divalent organic spacer layer is perfectly aligned or slightly displaced according to the space requirements of the organic cation. The RP has better flexibility, the DJ inorganic arrangement is more uniform, and the interval between inorganic layers is smaller. The two-dimensional layered perovskite has natural quantum well, E g As the inorganic amount (n) increases from 1 to +..
Polycrystalline thin films and single crystals are two perovskite thin films commonly used in photovoltaic applications. The size of the polycrystalline thin film is usually hundreds of nanometers to several micrometers, and a large number of grain boundaries exist in the polycrystalline thin film, so that the polycrystalline thin film becomes charge traps which are unfavorable for the photoelectric performance and stability of the perovskite material. Compared with a polycrystalline film, the perovskite single crystal has no grain boundary, lower defect density, better photoelectric property and higher stability. The absorption spectrum of the perovskite monocrystal is obviously red-shifted, and the light response range of the monocrystal perovskite solar cell can be widened, so that the upper limit short-circuit current density and the power conversion efficiency of the solar cell are increased. The perovskite single crystal can also be used for optical detection, X-ray detection, light emitting diodes and the like.
In recent years, 2D perovskite single crystals are also increasingly being used in two-dimensional flexible photodetectors. Compared with 3D perovskite, 2D hybrid perovskite becomes a new candidate material of photoelectric devices by virtue of the layered structure and superior stability. Similar to band gap confinement in quantum materials, the octahedral layer in two-dimensional perovskite is isolated by large organic cations, resulting in a wider band gap and lower dielectric constant, and thus greater exciton binding energy. The hydrophobicity of the organic chain also makes it a barrier for surface moisture absorption, thus making the two-dimensional hybrid perovskite have higher environmental stability. RP phase originated from K found in the 50 s of the 20 th century 2 NiF 4 . RP layered 2D hybrid perovskite has attracted considerable attention from researchers due to its excellent optical properties due to its strong quantum confinement effect and dielectric confinement effect. The inherent chemical and structural advantages of DJ phase perovskite include no octahedral shift, shortened interlayer distance, elimination/reduction of van der waals gaps, and enhanced hydrogen bonding, all of which improve carrier transport and chemical stability. Applications can range from photovoltaics to transistors, photodetectors, and other optoelectronic devices if the composition and structure of the 2D perovskite is reasonably designed. The heterojunction based on the 2D hybridized perovskite can be designed and constructed, and a new platform with different functions is provided for the photoelectronic technology.
However, in the prior art, the Two-dimensional perovskite single crystal synthesis procedure is complicated, and the quality of the finished product is not high, as in document 1 (Gao L, li X, traore B, et al, m-Phenylenediammonium as a New Spacer for Dion-Jacobson Two-Dimensional Perovskites [ J)]A similar mPDMADPbI is disclosed in J Am Chem Soc,2021,143 (31): 12063-73.) 4 Structural (mPDA) PbI 4 The synthesis method of (2) comprises the following steps:
1) 446.4mg (2 mmol) of PbO powder are dissolved in 3ml of hydrochloric acid and 1ml of H 3 PO 2 The solution was stirred for 5-10 minutes and heated at 200 c until the solution became clear. However, the method is that64.9mg (0.6 mmol) of mPDA was then added directly to the solution and stirred with heating until completely dissolved. The solution was cooled to 120℃to give white platy crystalline (mPDA) PbCl 4 。
2) Isolation of white powder (mPDA) PbCl 4 3ml HI and 1ml H were added 3 PO 2 The solution was heated at 200 ℃ until the crystals dissolved. The solution was then cooled to 120℃to give (mPDA) PbI 4 Orange plate-like crystals of (a).
However, this synthesis method is complicated in steps, and the perovskite is converted into the perovskite iodide, and secondly, the synthesis method may result in insufficient conversion, poor crystallization quality, and easy mixing and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the preparation method which has the advantages of simple steps, low cost and high material utilization rate and can effectively synthesize the high-quality two-dimensional perovskite single crystal.
Preparation of high quality DJ phase two-dimensional perovskite mPDMADPbI for high efficiency 4 The single crystal material improves the purity of the prepared perovskite single crystal, and invents a method for synthesizing mPDMADPbI by gradient cooling of aqueous solution 4 A method of single crystal.
The invention provides an mPDMADPbI 4 The preparation method of the two-dimensional perovskite single crystal is characterized by comprising the following steps of: the preparation method adopts an aqueous solution method and a variable rate gradient cooling compound method, and specifically comprises the following steps:
(1)mPhDMADPbI 4 preparing a precursor solution: taking a certain amount of mPDMADI respectively 2 And PbI 2 Placing in a glass bottle, and removing HI and H 3 PO 2 Placing in the glass bottle;
(2)mPhDMADPbI 4 preparation of two-dimensional perovskite single crystals: placing the glass bottle on a heating table, heating until the glass bottle is fully dissolved, and then obtaining mPDMADPbI after crystals are separated out by a variable rate gradient cooling method 4 Two-dimensional perovskite single crystals.
Preferably, in the step (2), the variable rate gradient cooling method is to cool at different rates in stages.
Preferably, in the step (2), the variable rate gradient cooling method is to cool to 102 ℃ at a rate of 2 ℃/h and then cool to room temperature at a rate of 1 ℃/h.
Preferably, said heating to substantially dissolve comprises heating until said solution exhibits a yellowish clear transparent solution.
Preferably, the heating to substantially dissolve comprises heating to 200 ℃ to substantially dissolve the solution to a yellowish clear transparent solution.
Preferably, the heating table is an intelligent temperature control heating table.
The invention also provides an mPDMADPbI 4 Two-dimensional perovskite single crystals, the mPDMADPbI 4 The two-dimensional perovskite single crystal is prepared according to the preparation method.
Preferably, the mPDMADPbI 4 The two-dimensional perovskite single crystal is a white strip crystal.
Preferably, the mPDMADPbI 4 The two-dimensional perovskite single crystal shows diffraction peaks of low-dimensional lead halide perovskite with 2 theta less than 10 degrees.
Preferably, at a distance corresponding toA diffraction peak of low-dimensional lead halide perovskite having 2 theta below 10 deg. appears at 8.39 deg..
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides a novel preparation method, which grows based on mPDMADI for the first time 2 A DJ phase two-dimensional perovskite single crystal of (C).
(2) The invention provides an mPDMADPbI 4 The preparation method of the two-dimensional perovskite monocrystal adopts an aqueous solution method and a variable rate gradient cooling composite method, and can efficiently prepare the high-quality DJ-phase two-dimensional perovskite mPDMADPbI 4 A monocrystalline material.
(3) The invention does not adopt a preparation method of firstly obtaining perovskite chloride and then converting the perovskite chloride into perovskite iodide, thereby avoiding the problem of incomplete conversion in the preparation process and improving the purity of crystal growth.
Drawings
FIG. 1 shows a two-dimensional perovskite material 1,3-Phenyldimethylammonium diiodide (mPDMADDI) employed in the present invention 2 ) A structural schematic;
FIG. 2 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 A physical schematic;
FIG. 3 is a schematic diagram of a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 A dried physical schematic;
FIG. 4 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 A Scanning Electron Microscope (SEM) schematic of (b);
FIG. 5 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 Spectral analysis (EDS) results under SEM;
FIG. 6 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 X-ray diffraction (XRD) results of (a).
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be further illustrated, but is not limited, by the following examples.
Example 1
mPhDMADPbI 4 The preparation method of the two-dimensional perovskite monocrystal adopts an aqueous solution method and a variable rate gradient cooling compound method, and comprises the following steps:
(1)mPhDMADPbI 4 preparing a precursor solution: taking a certain amount of mPDMADI respectively 2 And PbI 2 Placing in a glass bottle, and removing HI and H 3 PO 2 Placed in the glass bottle.
Referring to FIG. 1, FIG. 1 shows a two-dimensional perovskite material 1,3-Phenyldimethylammonium diiodide (mPDMADDI) employed in the present invention 2 ) A schematic structural diagram.
Specifically, in this step, the HI solution mainly acts to solubilize the solute, however, since the HI solution alone is unstable, H is added 3 PO 2 The reducing agent may act as a stabilizing agent.
In this example, 0.25mmol (98 mg) of mPDMADDI was weighed in step one 2 ，1mmol(461mg)PbI 2 Placed in a glass bottle having a capacity of 25ml, and then removed 4ml HI and 0.8ml H 3 PO 2 Placed in the glass bottle.
Preferably, the glass bottle is a transparent glass bottle.
Preferably, pbI 2 And mPDMADDI 2 The medicine provided by the Xibaolaet phototechnology Co., ltd is prepared with the solute of the precursor, the HI aqueous solution is the medicine provided by aladin, H 3 PO 2 The aqueous solution is a drug supplied by Alfa Aesar and is a solvent for placing the precursor.
(2)mPhDMADPbI 4 Preparation of two-dimensional perovskite single crystals: placing the glass bottle on a heating table, heating until the glass bottle is fully dissolved, and then obtaining mPDMADPbI after crystals are separated out by a variable rate gradient cooling method 4 Two-dimensional perovskite single crystals.
Preferably, the heating to substantially dissolve step specifically comprises heating the glass bottle to 200 ℃ to substantially dissolve until the solution exhibits a yellowish clear transparent solution.
Preferably, the variable rate gradient cooling method specifically comprises cooling to 102 ℃ at a rate of 2 ℃/h and then cooling to room temperature at a rate of 1 ℃/h.
Preferably, in the step (2), the heating table is an intelligent temperature control heating table, specifically a JW-5000G type heating table provided by wuhanjun for science and technology.
Example two
mPhDMADPbI 4 Process for preparing two-dimensional perovskite single crystalsThe preparation method comprises the following steps:
(1)mPhDMADPbI 4 preparing a precursor solution: 0.5mmol (196 mg) of mPDMADDI was weighed out separately 2 ，0.5mmol(230.5mg)PbI 2 Placed in a glass bottle with a capacity of 25ml, and then removed 10ml HI and 2ml H 3 PO 2 Placing in the glass bottle;
FIG. 1 shows a two-dimensional perovskite material mPHTADDI employed in the present invention 2 A schematic structural diagram.
In this step, the HI solution mainly acts to solubilize the solute, however, since the HI solution alone is unstable, H is added 3 PO 2 The reducing agent may act as a stabilizing agent.
Preferably, the glass bottle is a transparent glass bottle.
Preferably, pbI 2 And mPDMADDI 2 The medicine provided by the Xibaolaet phototechnology Co., ltd is prepared with the solute of the precursor, the HI aqueous solution is the medicine provided by aladin, H 3 PO 2 The aqueous solution is a drug supplied by Alfa Aesar and is a solvent for placing the precursor.
(2)mPhDMADPbI 4 Preparation of two-dimensional perovskite single crystals: placing the glass bottle on a heating table, heating to 200deg.C to dissolve thoroughly, and then cooling with variable rate gradient to obtain mPDMADPbI 4 Two-dimensional perovskite single crystals.
Preferably, the heating to 200 ℃ to fully dissolve specifically includes heating to 200 ℃ to fully dissolve until the solution exhibits a yellowish clear transparent solution.
Preferably, the variable rate gradient cooling method specifically comprises cooling to 102 ℃ at a rate of 2 ℃/h and then cooling to room temperature at a rate of 1 ℃/h.
Preferably, in the step (2), the intelligent temperature-control heating table is a JW-5000G type heating table provided by Wuhanjun for science and technology.
Example III
This example is an mPDMADPbI obtained by one or both of the examples of the invention 4 Two-dimensional perovskite single crystals, see FIGS. 2-3, wherein FIG. 2 shows two-dimensional perovskite single crystals synthesized according to the present inventionPerovskite mphdadfbi 4 The physical schematic diagram shows that a large amount of mPDMADPbI can be observed in the glass bottle after the temperature reduction is finished 4 The precipitation of the two-dimensional perovskite monocrystal is mainly white strip-shaped crystals; FIG. 3 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 The dried physical schematic is measured to show that the size of crystals attached together after drying is about 2cm long and about 5mm wide.
Referring to FIG. 4, FIG. 4 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 The SEM scale is 500 mu m, and the two-dimensional perovskite mPDMADPbI synthesized by the invention is measured 4 The individual crystals are about 450 μm wide and can be up to centimeter in length.
Referring to FIG. 5, FIG. 5 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 EDS analysis under SEM showed that the perovskite-containing element C, N, I, pb appeared in the selected region, and that the presence of Pb element proved two-dimensional mPDMADPbI 4 Successful synthesis of perovskite single crystals.
FIG. 6 shows a two-dimensional perovskite mPDMADPbI synthesized according to the invention 4 X-ray diffraction (XRD) results of (C), experiments have shown that, in correspondence with the spacingThe diffraction peak of the low-dimensional lead halide perovskite with 2 theta less than 10 degrees appears at 8.39 degrees, further proving the two-dimensional mPDMADPbI 4 Successful synthesis of perovskite single crystals.
In conclusion, the invention adopts the aqueous solution method and the variable rate gradient cooling composite method, and can efficiently prepare the high-quality DJ-phase two-dimensional perovskite mPDMADPbI 4 Single crystal material, first preparation of mPDMADI-based 2 A DJ phase two-dimensional perovskite single crystal of (C). The invention adopts mPDMADI 2 And PbI 2 As a crystal growth raw material, the crystal growth cost is reduced, and the purity of crystal growth is improved; the crystal growth adopts a solution cooling method, and the preparation method is simple and easy to operate.
It should be noted that the embodiment of the present invention only shows an example of the present invention, and the specific parameters thereof are not limited by the embodiment.
The scope of the present invention is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present invention by those skilled in the art without departing from the scope and spirit of the invention. It is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. mPhDMADPbI 4 The preparation method of the two-dimensional perovskite single crystal is characterized by comprising the following steps of: the preparation method adopts an aqueous solution method and a variable rate gradient cooling compound method, and specifically comprises the following steps:
(1)mPhDMADPbI 4 preparing a precursor solution: taking a certain amount of mPDMADI respectively 2 And PbI 2 Placing in a glass bottle, and removing HI and H 3 PO 2 Placing in the glass bottle;
(2)mPhDMADPbI 4 preparation of two-dimensional perovskite single crystals: placing the glass bottle on a heating table, heating until the glass bottle is fully dissolved, and then obtaining mPDMADPbI after crystals are separated out by a variable rate gradient cooling method 4 Two-dimensional perovskite single crystals.
2. An mPDMADPbI as defined in claim 1 4 The preparation method of the two-dimensional perovskite single crystal is characterized by comprising the following steps of: in the step (2), the variable rate gradient cooling method is to cool at different rates in stages.
3. An mphdadfbi according to claim 2 4 The preparation method of the two-dimensional perovskite single crystal is characterized by comprising the following steps of: in the step (2), the variable rate gradient cooling method is to cool to 102 ℃ at the speed of 2 ℃/h and cool to room temperature at the speed of 1 ℃/h.
4. An mPDMADPbI as defined in claim 1 4 The preparation method of the two-dimensional perovskite single crystal is characterized by comprising the following steps of: the heating to dissolve thoroughly comprises heatingThe solution exhibited a pale yellow clear transparent solution.
5. An mPDMADPbI as defined in claim 4 4 The preparation method of the two-dimensional perovskite single crystal is characterized by comprising the following steps of: the heating to fully dissolve specifically comprises heating to 200 ℃ to fully dissolve until the solution presents a yellowish clear transparent solution.
6. An mPDMADPbI as defined in claim 1 4 The preparation method of the two-dimensional perovskite single crystal is characterized by comprising the following steps of: the heating table is an intelligent temperature control heating table.
7. mPhDMADPbI 4 The two-dimensional perovskite single crystal is characterized in that: the mPDMADPbI 4 The two-dimensional perovskite single crystal is an mPDMADPbI according to claim 1-6 4 The preparation method of the two-dimensional perovskite single crystal is used for preparing the two-dimensional perovskite single crystal.
8. An mPDMADPbI as defined in claim 7 4 The two-dimensional perovskite single crystal is characterized in that: the mPDMADPbI 4 The two-dimensional perovskite single crystal is a white strip crystal.
9. An mPDMADPbI as defined in claim 7 4 The two-dimensional perovskite single crystal is characterized in that: the mPDMADPbI 4 The two-dimensional perovskite single crystal shows diffraction peaks of low-dimensional lead halide perovskite with 2 theta less than 10 degrees.
10. An mphdadfbi according to claim 9 4 The two-dimensional perovskite single crystal is characterized in that: at a distance corresponding toA diffraction peak of low-dimensional lead halide perovskite having 2 theta below 10 deg. appears at 8.39 deg..
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