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A kind of preparation method of nontoxic and stable perovskite

A perovskite, stable technology, applied in the direction of chemical instruments and methods, inorganic chemistry, tin compounds, etc., can solve the problems affecting the application of solar cells, disadvantages, etc., achieve huge potential application value, simplify the reaction process, avoid equipment requirements and Effect of Reactive Atmosphere Requirements

Active Publication Date: 2020-12-15
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in these preparation methods, it is necessary to add the starting reactants at a high temperature of 120 ° C, or to prepare the precursor solution for the next reaction, which brings great restrictions to the preparation process, so the above solid reaction method or solution reaction methods are not favorable for this nontoxic and stable perovskite Cs 2 SnA x B 6-x Large-scale production preparation, which affects its further application in solar cells

Method used

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  • A kind of preparation method of nontoxic and stable perovskite
  • A kind of preparation method of nontoxic and stable perovskite
  • A kind of preparation method of nontoxic and stable perovskite

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preparation example Construction

[0035] The invention discloses a preparation method of non-toxic and stable perovskite,

[0036] The preparation route is as follows,

[0037]

[0038] Among them, A and B are any halogen atoms, m, n, l, x, y, z are any constants greater than or equal to 0, and M and N are not 0 at the same time, L and X are not 0 at the same time; x is 0~ Any constant between 6, including two constants of 0 and 6 here. In particular, when x is 0, the reaction is:

[0039] ,

[0040] or

[0041] ,

[0042] The preparation method comprises the following steps,

[0043] S1. Weighing the reaction raw materials, putting the reaction raw materials into an organic solvent, heating the reaction and stirring for 2-12 hours. The organic solvent is 1,4-butyrolactone (GBL), and a very pure target product can be obtained by using this organic solvent. The reaction temperature is 25-220°C, and in this embodiment, the preferred reaction temperature is 70°C.

[0044] S2. Add a cleaning solvent...

Embodiment 1

[0049] Example 1: Cs 2 SnI 6 Synthesis

[0050] Weigh 1.036g of CsI and 0.744g of SnI respectively 2 , 0.508g of I 2 , take 5 ml of organic solvent 1,4-butyrolactone (GBL) or N,N-dimethylformamide (DMF), and add them in sequence to a 10 ml reaction bottle containing magnetons to form a mixed solution. Put the mixed solution on a magnetic hot plate and stir the reaction at 70°C, stop the reaction after 10 hours, add absolute ethanol to the reaction bottle and let it stand for 3-5 minutes, then remove the upper part of the solution in the reaction bottle to obtain a black precipitate , and then use absolute ethanol to wash the precipitate 3-5 times. After cleaning, place the precipitate in an oven at 70°C for 5-8 hours to obtain the final product. attached figure 1 It is the XRD test characterization diagram of the product obtained when using GBL and DMF as the reaction solvent, and the dotted line in the figure is the simulated Cs 2 SnI 6 data. When GBL was used as the...

Embodiment 2

[0051] Example 2: Cs 2 SnBr 6 synthesis

[0052] Weigh 0.85g of CsBr and 1.11g of SnBr respectively 2 , Measure 5ml of the organic solvent 1,4-butyrolactone, and sequentially add it into a 10ml reaction bottle containing magnetons to form a mixed solution. Place the mixed solution on a magnetic hot plate and stir the reaction at 70°C, stop the reaction after 10 hours, add absolute ethanol to the reaction bottle and let it stand for 3-5 minutes, then remove the upper part of the solution in the reaction bottle to obtain a precipitate, Next, use absolute ethanol to wash the precipitate 3-5 times. After cleaning, place the precipitate in an oven at 70° C. for 5-8 hours to obtain the final product. attached image 3 It is the XRD test characterization diagram of the product, and the dotted line in the figure is the simulated Cs 2 SnBr 6 Data, product XRD diffraction peaks and simulated Cs 2 SnBr 6 Data peaks coincide. The above results show that when using CsBr and SnBr ...

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Abstract

The invention discloses a method for preparing nontoxic stable perovskite. The method comprises the following steps: S1, weighing reaction raw materials, and heating and stirring the reaction raw materials with an organic solvent to implement reactions for 2-12 hours; S2, putting a cleaning solvent into the reaction product of the step S1, and allowing standing still for 3-5 minutes; S3, filteringthe reaction product of the step S2, removing a solution part so as to obtain precipitate, and cleaning the precipitate by using the cleaning solvent for 3-5 times; S4, drying the cleaned precipitatein the step S3 in an oven for 5-8 hours, thereby obtaining a final product. According to the method disclosed by the invention, operation steps that reactants are added at a high temperature and a precursor solution is prepared in a conventional solution preparation method are avoided, a reaction process can be simplified, and special equipment requirements and reaction atmosphere requirements ina solid reaction method can be avoided.

Description

technical field [0001] The invention relates to a method for preparing a perovskite, in particular to a method for preparing a non-toxic and stable perovskite applied to solar cells, and belongs to the field of photoelectric technology. Background technique [0002] In the past few decades, the development of perovskite has made remarkable achievements. At present, the efficiency of lead-based perovskite battery devices has exceeded 20%. However, the toxicity of lead-based perovskite materials in traditional technologies has greatly restricted their further commercial applications. Therefore, research on non-toxic perovskite materials is imminent. [0003] In recent years, based on Sn 2+ The perovskite has been favored by many researchers because of its green and non-toxic properties. At present, people have successfully prepared Sn-based 2+ solar cell devices. The FASnI-based 3 The photoelectric conversion efficiency of perovskite battery devices has reached 9%. At th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/00
CPCC01G19/006
Inventor 高志强密保秀郑树超石莹徐昕
Owner NANJING UNIV OF POSTS & TELECOMM