Cyclodextrin citric acid condensate passivator, preparation method and application thereof
By preparing the cyclodextrin citric acid condensate passivator, the problem of burying defects in the perovskite SnO2 film interface is solved, and the effect of improving the film conductivity and band conductivity and improving device performance and stability is achieved.
Patent Information
- Application Number
- CN202411858445.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-05-06
AI Technical Summary
The prior art is prone to burying defects when preparing perovskite SnO2 film interfaces, which affects device performance.
By preparing cyclodextrin citric acid condensate passivator, it uses its multifunctional Lewis alkali properties to chemically coordinate interaction with SnO2 and perovskites, reducing oxygen vacancies and buried defects at the interface.
It effectively reduces the oxygen vacancy and buried defects of the SnO2 film, improves the conductivity and band conductivity of the film, promotes the crystallization of perovskites, and improves the performance and environmental stability of the device.
Smart Images
Figure CN119930863A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of passivation materials, and in particular to a cyclodextrin citric acid condensate passivator, a preparation method and application thereof. Background Art
[0002] In recent years, dextrin derivatives have been recognized as effective passivators of interfacial defects, significantly improving the performance and humidity stability of perovskite films. This efficacy is due to their large number of hydroxyl (-OH) groups and large bowl-shaped cavities, which form strong supramolecular interactions with perovskite materials through hydrogen bonding. β-cyclodextrin (β-CD), as a precursor additive, can effectively prevent the crystallization of residual PbI2, capture the iodine generated in the perovskite, and inhibit its escape. The above precursor treatment leads to uniform crystal growth, passivates uncoordinated lead cation defects, and eliminates Pb0 in the perovskite film, further improving the stability of the device. However, due to its single functional group, the precursor treatment of β-CD can only address limited defect traps on the perovskite grain boundaries. The contact quality and existing defects between the electron transport layer (ETL, such as SnO2) and the perovskite also significantly affect the crystallization of the perovskite, which determines the performance of the final device. For the modification of SnO2 film interfaces, Lewis bases containing carbonyl (-C=O) functional groups are usually used to effectively passivate oxygen vacancy defects, enhance the conductivity of SnO2 films, and accelerate electron transfer. In addition, these compounds are also effective in passivating perovskite grain boundary defects and enhancing their crystallization process. Based on the above background, carefully designed -C=O groups grafted onto β-CD molecules as multifunctional Lewis bases to optimize the contact quality and reduce buried defects at the SnO2 / perovskite interface are crucial to further improve device performance. Summary of the invention
[0003] One of the purposes of the present invention is to provide a method for preparing a cyclodextrin citric acid condensate passivator, which is used to solve the disadvantage that buried defects are easily generated when preparing perovskite SnO2 thin film interface modification in the prior art.
[0004] The present invention is achieved through the following technical scheme. A preparation method of a cyclodextrin citric acid condensate passivator comprises the following steps: S100, mixing citric acid and sodium hypophosphite, adding the mixture to deionized water and dissolving the mixture to prepare a first mixed solution; S200, adding β-cyclodextrin to the first mixed solution, and then heating the first mixed solution to 70°C to 85°C, and waiting for the β-cyclodextrin to be completely dissolved to obtain a second mixed solution; S300, placing the second mixed solution in a constant temperature drying oven for reaction to obtain a reactant; S400, dissolving the reactant in 50 ml of deionized water, and slowly dropping the dissolved reactant into anhydrous ethanol to precipitate a precipitate, and washing the precipitated precipitate with anhydrous ethanol for 5 to 6 times; S500, drying the washed precipitate at 60°C to a constant weight.
[0005] Furthermore, the mass ratio of citric acid to sodium hypophosphite is 1:0.1~0.
[0006] Furthermore, the reaction in step S300 includes two stages of reaction: in the first stage of reaction, the temperature of the constant temperature drying oven is raised to 100° C. and maintained for 1 hour, and then in the second stage of reaction, the temperature of the constant temperature drying oven is raised to 120° C. and maintained for 5 hours.
[0007] Another aspect of the present invention provides a cyclodextrin citric acid condensate passivator, which is prepared according to the above preparation method.
[0008] On the other hand, the present invention also provides an application of a cyclodextrin citric acid condensate passivator in preparing a SnO2 electron transport layer. First, a cyclodextrin citric acid condensate passivator is prepared by the preparation method as described above, the cyclodextrin citric acid condensate passivator and SnO2 are mixed into a colloidal aqueous solution, the colloidal aqueous solution is placed in an ultrasonic instrument for ultrasonication for 10 minutes, and then the colloidal aqueous solution is filtered with a water-based filter for standby use, the conductive glass is placed in an ozone cleaner for cleaning for 25 minutes to increase the wettability of the substrate, and then the colloidal aqueous solution is spin-coated on a FTO substrate. After the spin coating is completed, the FTO substrate is placed on a hot table for annealing, and after the annealing is completed, a SnO2 electron transport layer is prepared.
[0009] Furthermore, the mass ratio of the cyclodextrin citric acid condensate passivator to SnO2 is 1:2 or 1:4.
[0010] Furthermore, the mass ratio of the cyclodextrin citric acid condensate passivator to SnO2 is 5:2 or 5:4.
[0011] Furthermore, the spin coating speed is 3000 rpm / s, the annealing temperature on the hot stage is 150° C., and the annealing time is 30 min.
[0012] The last aspect of the present invention provides a use of a cyclodextrin citric acid condensate passivator in the preparation of a perovskite photoelectric detection device. According to the preparation method described above, a cyclodextrin citric acid condensate passivator is prepared, the cyclodextrin citric acid condensate passivator and SnO2 are prepared into a colloidal aqueous solution, the colloidal aqueous solution is placed in an ultrasonic instrument for ultrasonication for 10 minutes, and then the colloidal aqueous solution is filtered with a water filter for standby use, the conductive glass is placed in an ozone cleaner for cleaning for 25 minutes to increase the wettability of the substrate, and then the colloidal aqueous solution is spin-coated on a FTO substrate, and after the spin coating is completed, the FTO substrate is placed on a hot stage for annealing, and after the annealing is completed, a SnO2 electron transport layer is prepared; lead bromide and cesium iodide are dissolved in dimethyl sulfoxide, and stirred at 60°C for 2 hours to prepare a perovskite precursor solution; the precursor solution is spin-coated on the SnO2 electron transport layer, and the spin coating is firstly used at a speed of 1500 rpm / s for 15s; then at a speed of 3500 rpm / s for 35s; after the spin coating is completed, it is placed at 30°C for 3 minutes and then at 225 °C for 10 min to obtain a dense perovskite film, 3-hexyl substituted polythiophene was spin-coated on the perovskite layer at a speed of 3000 rpm / s for 30 s, and then annealed at 180 °C for 5 min; after annealing, the film was heated to 5×10⁻ 4 A 110 nm thick silver electrode layer was prepared by thermal evaporation in a vacuum environment of 1.3 Pa.
[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0014] 1. The present invention provides a cyclodextrin citric acid condensate passivator. Compared with the common perovskite interface passivator, the main raw materials of the passivator of the present invention are citric acid (CA) and cyclodextrin (CD), both of which are natural products that are easily obtained. Compared with the commonly used fluorine- and chlorine-containing, and sulfonic acid functional group passivators, it is more environmentally friendly and pollution-free.
[0015] 2. The preparation method of the citric acid cyclodextrin condensate passivator provided by the present invention is simple, and only needs to generate dehydration condensation products through carboxyl and hydroxyl groups, and the inorganic base required for the reaction is cheap and easy to obtain. However, some common high molecular condensates containing aniline generally require coupling Stille reaction, Knoevenagel reaction and random copolymerization under the catalysis of expensive metal palladium to be prepared, and the final polymer also needs to undergo a complex purification process (such as Soxhlet extraction of different solvents and column chromatography) to obtain a polymer with a relatively stable molecular weight.
[0016] 3. Compared with the precursor engineering, the cyclodextrin citric acid condensate provided by the present invention is buried in the SnO2 interface and can have a strong chemical coordination interaction with SnO2 and perovskite at the same time. This interaction effectively reduces oxygen vacancies, eliminates trap states, reduces surface roughness, and improves the conductivity of the SnO2 film. In addition, the modification also improves the conduction band of the SnO2 film, which is conducive to more efficient electron extraction. The passivator deposited on SnO2 interacts with the uncoordinated Pb in the perovskite through chemical coordination and hydrogen bonding. 2+ It interacts strongly with halogen ions, promoting the crystallization of perovskite and improving the quality of the film.
[0017] 4. The self-powered perovskite photodetector device modified with the cyclodextrin passivator provided by the present invention achieves a fast and repeatable microsecond response time and has excellent environmental stability. In addition, the cyclodextrin citric acid condensate provided by the present invention has also achieved certain results in reducing lead leakage in water bodies, which provides insights for subsequent researchers to develop effective lead leakage chelators. The obtained cyclodextrin citric acid passivator (CDCA) can also be used to prepare efficient perovskite solar cells and light-emitting diodes. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:
[0019] Figure 1 This is a flow chart of the preparation method provided in Example 1.
[0020] Figure 2 This is the XRD spectrum of the cyclodextrin citric acid condensate passivator provided in Example 1.
[0021] Figure 3 This is a physical picture of the powder of the cyclodextrin citric acid condensate passivator provided in Example 1.
[0022] Figure 4 This is a flow chart of preparing an electron transport layer using the cyclodextrin citric acid condensate and SnO2 provided in Example 2.
[0023] Figure 5 This is a SEM image of the electron transport layer prepared by the cyclodextrin citric acid condensate provided in Example 2 and SnO2.
[0024] Figure 6 Response time diagram of the perovskite detector device provided in Example 2.
[0025] Figure 7 Graph of the specific detectivity of the perovskite detector device provided in Example 1. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.
[0027] Unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art in the art of the present invention. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail. Regarding the "comprising", "including", "having", "containing" and the like used herein, they are all open-ended terms, that is, they mean including but not limited to. Unless the context clearly indicates otherwise, the expressions "a" and "one" used herein include plural references. The term "about" used herein means a range of ±20% of the value thereafter. In some embodiments, the term "about" means a range of ±10% of the value thereafter. In some embodiments, the term "about" means a range of ±5% of the value thereafter.
[0028] Embodiment 1,
[0029] This embodiment provides a method for preparing a cyclodextrin citric acid condensate passivating agent. Figure 1 The preparation method flow chart of this embodiment is shown, and this embodiment specifically includes the following contents:
[0030] First, accurately weigh 12.69 g of citric acid and 2.52 g of sodium hypophosphite and dissolve them in 12 mL of deionized water.
[0031] After the citric acid was completely dissolved, 11.35 g of β-CD was added, and then the temperature was raised to 80 °C to fully dissolve the cyclodextrin, and finally a colorless and transparent solution was obtained.
[0032] Subsequently, the solution was placed in a forced air constant temperature drying oven and reacted at 100 °C for 1 h and then at 120 °C for 5 h.
[0033] After the reaction was completed, 50 mL of deionized water was added to dissolve it, and then it was slowly added dropwise to anhydrous ethanol until a precipitate was formed.
[0034] The precipitate is repeatedly washed with anhydrous ethanol for 5 to 6 times, and finally dried at 60° C. to a constant weight, thereby obtaining a cyclodextrin citric acid condensate passivating agent.
[0035] The cyclodextrin citric acid condensate passivating agent prepared according to the above steps is subjected to X-ray diffraction to obtain an XRD spectrum as shown in Figure 2 shown. Figure 3 The actual powder picture of the cyclodextrin citric acid condensate passivating agent prepared by the steps in the example is shown.
[0036] Embodiment 2,
[0037] This embodiment provides an application of a cyclodextrin citric acid condensate passivator in preparing a SnO2 electron transport layer and in preparing a perovskite photoelectric detection device, specifically including the following contents:
[0038] According to the preparation method in Example 1, a cyclodextrin citric acid condensate passivating agent was prepared.
[0039] The mass ratio of the cyclodextrin citric acid condensate passivator in Example 1 to SnO2 was 1:4 to prepare a SnO2 colloidal aqueous solution, which was then placed in an ultrasonic instrument for 10 minutes and filtered with a 0.2 μm aqueous filter for standby use. The conductive glass (FTO) was first placed in an ozone cleaner for 25 minutes to increase the wettability of the substrate, and then the prepared colloidal aqueous solution was spin-coated on the FTO substrate at a speed of 3000 rpm / s and annealed on a 150°C hot stage for 30 minutes.
[0040] 367 mg (1 mmol) of PbBr2 and 260 mg (1 mmol) of CsI were dissolved in DMSO and stirred at 60 °C for 2h to obtain a transparent bright yellow perovskite precursor solution (1 M). Then, the precursor solution was spin-coated on the pre-prepared SnO2 electron transport layer, and the spin-coating parameters were set as follows: initially spinning at 1500 rpm / s for 15 s, and then spinning at 3500 rpm / s for 35 s. After spin coating, the film was allowed to stand at 30 °C for 3 min until it turned golden yellow, and then annealed at 225 °C for 10 min to form a dense perovskite film. Subsequently, 15 mg of P3HT was dissolved in 1 mL of chlorobenzene and spin-coated on the perovskite layer at 3000 rpm / s, and annealed at 180 °C for 5 min after 30 seconds. Finally, at 5 × 10 -4 In a vacuum environment of 0.03 Pa, a silver electrode with a thickness of about 110 nm was prepared by thermal evaporation technology to produce the detector device.
[0041] Figure 4 The flowchart of preparing the electron transport layer by using the cyclodextrin citric acid condensate obtained in this embodiment and SnO2 is shown; Figure 5The SEM image of the electron transport layer prepared by the cyclodextrin citric acid condensate and SnO2 in this embodiment is shown.
[0042] Figure 6 A response time diagram of the perovskite detector device prepared in this embodiment is shown; Figure 7 The specific detectivity diagram of the perovskite detector device prepared in this embodiment is shown.
[0043] Embodiment 3,
[0044] This embodiment provides an application of a cyclodextrin citric acid condensate passivator in preparing a SnO2 electron transport layer and in preparing a perovskite photoelectric detection device, specifically including the following contents:
[0045] According to the preparation method in Example 1, a cyclodextrin citric acid condensate passivating agent was prepared.
[0046] The mass ratio of the cyclodextrin citric acid condensate passivator in Example 1 to SnO2 was 1:4 to prepare a SnO2 colloidal aqueous solution, which was then placed in an ultrasonic instrument for 10 minutes and filtered with a 0.2 μm aqueous filter for standby use. The conductive glass (FTO) was first placed in an ozone cleaner for 25 minutes to increase the wettability of the substrate, and then the prepared colloidal aqueous solution was spin-coated on the FTO substrate at a speed of 3000 rpm / s and annealed on a 150°C hot stage for 30 minutes.
[0047] 367 mg (1 mmol) of PbBr2 and 260 mg (1 mmol) of CsI were dissolved in DMSO and stirred at 60 °C for 2h to obtain a transparent bright yellow perovskite precursor solution (1 M). Then, the precursor solution was spin-coated on the pre-prepared SnO2 electron transport layer, and the spin-coating parameters were set as follows: initially spinning at 1500 rpm / s for 15 s, and then spinning at 3500 rpm / s for 35 s. After spin coating, the film was allowed to stand at 30 °C for 3 min until it turned golden yellow, and then annealed at 225 °C for 10 min to form a dense perovskite film. Subsequently, 15 mg of P3HT was dissolved in 1 mL of chlorobenzene and spin-coated on the perovskite layer at 3000 rpm / s, and annealed at 180 °C for 5 min after 30 s. Finally, at 5 × 10 -4 In a vacuum environment of 0.03 Pa, a silver electrode with a thickness of about 110 nm was prepared by thermal evaporation technology to produce the detector device.
[0048] Embodiment 4,
[0049] This embodiment provides an application of a cyclodextrin citric acid condensate passivator in preparing a SnO2 electron transport layer and in preparing a perovskite photoelectric detection device, specifically including the following contents:
[0050] According to the preparation method in Example 1, a cyclodextrin citric acid condensate passivating agent was prepared.
[0051] The mass ratio of the cyclodextrin citric acid condensate passivator in Example 1 to SnO2 was 5:2 to prepare a SnO2 colloidal aqueous solution, which was then placed in an ultrasonic instrument for 10 minutes and filtered with a 0.2 μm aqueous filter for standby use. The conductive glass (FTO) was first placed in an ozone cleaner for 30 minutes to increase the wettability of the substrate, and then the prepared colloidal aqueous solution was spin-coated on the FTO substrate at a speed of 3000 revolutions per second and annealed on a 150°C hot stage for 60 minutes.
[0052] 367 mg (1 mmol) of PbBr2 and 260 mg (1 mmol) of CsI were dissolved in DMSO and stirred at 60 °C for 2 h to obtain a transparent bright yellow perovskite precursor solution (1 M). Then, the precursor solution was spin-coated on the pre-prepared SnO2 electron transport layer, and the spin-coating parameters were set as follows: initially spinning at 1500 rpm / s for 15 s, and then spinning at 3500 rpm / s for 35 s. After spin coating, the film was allowed to stand at 30 °C for 3 min until it turned golden yellow, and then annealed at 225 °C for 10 minutes to form a dense perovskite film. Subsequently, 15 mg of P3HT was dissolved in 1 mL of chlorobenzene and spin-coated on the perovskite layer at 3000 rpm / s, and annealed at 180 °C for 5 min after 30 s. Finally, at 5 × 10 -4 In a vacuum environment of 0.03 Pa, a silver electrode with a thickness of about 110 nm was prepared by thermal evaporation technology to produce the detector device.
[0053] Embodiment 5,
[0054] This embodiment provides an application of a cyclodextrin citric acid condensate passivator in preparing a SnO2 electron transport layer and in preparing a perovskite photoelectric detection device, specifically including the following contents:
[0055] According to the preparation method in Example 1, a cyclodextrin citric acid condensate passivating agent was prepared.
[0056] The cyclodextrin citric acid condensate passivator in Example 1 and SnO2 were prepared in a mass ratio of 5:4 to prepare a SnO2 colloidal aqueous solution, which was then placed in an ultrasonic instrument for 10 minutes and filtered with a 0.2 μm aqueous filter for standby use. The conductive glass (FTO) was first placed in an ozone cleaner for 30 minutes to increase the wettability of the substrate, and then the prepared colloidal aqueous solution was spin-coated on the FTO substrate at a speed of 3000 revolutions per second and annealed on a 150°C hot stage for 60 minutes.
[0057] 367 mg (1 mmol) of PbBr2 and 260 mg (1 mmol) of CsI were dissolved in DMSO and stirred at 60 °C for 2 h to obtain a transparent bright yellow perovskite precursor solution (1 M). Then, the precursor solution was spin-coated on the pre-prepared SnO2 electron transport layer, and the spin-coating parameters were set as follows: initially spinning at 1500 rpm / s for 15 s, and then spinning at 3500 rpm / s for 35 s. After spin coating, the film was allowed to stand at 30 °C for 3 min until it turned golden yellow, and then annealed at 225 °C for 10 minutes to form a dense perovskite film. Subsequently, 15 mg of P3HT was dissolved in 1 mL of chlorobenzene and spin-coated on the perovskite layer at 3000 rpm / s, and annealed at 180 °C for 5 min after 30 s. Finally, at 5 × 10 -4 In a vacuum environment of 0.03 Pa, a silver electrode with a thickness of about 110 nm was prepared by thermal evaporation technology to produce the detector device.
[0058] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A method for preparing a cyclodextrin citric acid condensate passivator, characterized in that: The preparation method comprises: S100, mixing citric acid and sodium hypophosphite, and then adding them into deionized water for dissolution to prepare a first mixed solution; S200, β - cyclodextrin is added to the first mixed solution, and then the first mixed solution is heated to 70℃~85℃. β - cyclodextrin is completely dissolved to obtain a second mixed solution; S300, placing the second mixed solution in a constant temperature drying oven for reaction to obtain a reactant; S400, dissolving the reactant with 50 ml of deionized water, slowly dropping the dissolved reactant into anhydrous ethanol to precipitate a precipitate, and washing the precipitate with anhydrous ethanol for 5 to 6 times; S500, drying the washed precipitate at 60°C to a constant weight.
2. The method for preparing a cyclodextrin citric acid condensate passivating agent according to claim 1, characterized in that: The mass ratio of the citric acid to sodium hypophosphite is 1:0.
1.
3. The preparation method of the cyclodextrin citric acid condensate passivator according to claim 1, characterized in that: The reaction in step S300 includes two stages of reaction: The first stage of the reaction is to raise the temperature of the constant temperature drying oven to 100°C and keep it for 1 hour, and then carry out the second stage of the reaction. The second stage of the reaction is to raise the temperature of the constant temperature drying oven to 120°C and keep it for 5 hours.
4. A cyclodextrin citric acid condensate passivator, characterized in that: The cyclodextrin citric acid condensate passivator is prepared according to the preparation method as described in any one of claims 1 to 3.
5. Application of a cyclodextrin citric acid condensate passivator in the preparation of a SnO2 electron transport layer, characterized in that: The cyclodextrin citric acid condensate passivating agent is prepared by the preparation method according to any one of claims 1 to 3, The cyclodextrin citric acid condensate passivator and SnO2 are prepared into a colloidal aqueous solution, the colloidal aqueous solution is placed in an ultrasonic instrument for ultrasonication for 10 minutes, and then the colloidal aqueous solution is filtered with a water filter for standby use. The conductive glass was placed in an ozone cleaning machine for 25 min to increase the wettability of the substrate. Subsequently, the colloidal aqueous solution is spin-coated on the FTO substrate. After the spin coating is completed, the FTO substrate is placed on a hot stage for annealing. After the annealing is completed, a SnO2 electron transport layer is prepared.
6. The use of the cyclodextrin citric acid condensate passivator according to claim 5 in the preparation of a SnO2 electron transport layer, characterized in that: The mass ratio of the cyclodextrin citric acid condensate passivator to SnO2 is 1:2 or 1:
4.
7. Use of the cyclodextrin citric acid condensate passivator according to claim 5 in the preparation of a SnO2 electron transport layer, characterized in that: The mass ratio of the cyclodextrin citric acid condensate passivator to SnO2 is 5:2 or 5:
4.
8. The use of the cyclodextrin citric acid condensate passivating agent according to claim 5 in the preparation of a SnO2 electron transport layer, characterized in that: The spin coating speed is 3000 rpm / s, The annealing temperature on the hot stage is 150°C, and the annealing time is 30 min.
9. Application of a cyclodextrin citric acid condensate passivator in the preparation of a perovskite photodetector, characterized in that: The cyclodextrin citric acid condensate passivating agent is prepared by the preparation method according to any one of claims 1 to 3, The cyclodextrin citric acid condensate passivator and SnO2 are prepared into a colloidal aqueous solution, the colloidal aqueous solution is placed in an ultrasonic instrument for 10 minutes, and then the colloidal aqueous solution is filtered with a water filter for standby use. The conductive glass was placed in an ozone cleaning machine for 25 min to increase the wettability of the substrate. Then, the colloidal aqueous solution is spin-coated on the FTO substrate, and after the spin coating is completed, the FTO substrate is placed on a hot stage for annealing, and after the annealing is completed, a SnO2 electron transport layer is prepared; Dissolving lead bromide and cesium iodide in dimethyl sulfoxide and stirring at 60° C. for 2 hours to prepare a perovskite precursor solution; The precursor solution is spin-coated on the SnO2 electron transport layer, wherein the spin coating is firstly performed at a rotation speed of 1500 rpm / s for 15 seconds, and then at a rotation speed of 3500 rpm / s for 35 seconds; After the spin coating is completed, it is placed in an environment of 30 °C for 3 minutes and annealed at 225 °C for 10 min to obtain a dense perovskite film. The 3-hexyl substituted polythiophene is spin-coated on the perovskite layer at a speed of 3000 rpm / s for 30 seconds, and then annealed at 180 °C for 5 min; after the annealing is completed, the film is heated at 5×10⁻ 4 A 110 nm silver electrode layer was prepared by thermal evaporation under a vacuum environment of 1.3 Pa.
10. A use of a cyclodextrin citric acid condensate passivator in the preparation of perovskite solar cells and perovskite light-emitting diodes, characterized in that: The passivator in the perovskite solar cell and the perovskite light-emitting diode is prepared by the preparation method according to any one of claims 1 to 3 to obtain a cyclodextrin citric acid condensate passivator.