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A method for efficiently preparing perovskite microcrystals by microwave method

A technology of perovskite and microwave method, applied in chemical instruments and methods, crystal growth, single crystal growth, etc., can solve the problems of large crystal quality difference, crystal inhomogeneity, temperature gradient difference, etc., and achieve good crystallinity and phase High purity, short time-consuming results

Active Publication Date: 2022-04-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the heating method of temperature-rising crystallization is heat conduction. The heat is transferred from the outside of the object to the inside, and the heating is carried out from the surface to the inside with a gradient. Therefore, there will inevitably be uneven heating inside the object, and there will be a difference in temperature gradient, resulting in local overheating. Happening
Therefore, the precipitated crystals are not uniform, which will lead to large differences in crystal quality

Method used

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  • A method for efficiently preparing perovskite microcrystals by microwave method
  • A method for efficiently preparing perovskite microcrystals by microwave method
  • A method for efficiently preparing perovskite microcrystals by microwave method

Examples

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Effect test

Embodiment 1－3

[0048] Efficient preparation of perovskite crystallites (MA) by a microwave method X FA 1－X PB 3 ) method, such as figure 1 shown, including the following steps:

[0049] (1) Weigh MAI (methylamine iodide, CH 3 NH 3 I), FAI (formamidine iodide, HC (NH 2 ) 2 I) and PbI 2 (FAI+MAI and PbI 2 The molar ratio is 1:1), wherein the molar ratio between MAI and FAI is shown in Table 1, MAI, FAI and PbI 2 Dissolve in propylene carbonate, sonicate for the time shown in Table 1, and constantly stir for the time shown in Table 1 to obtain a clear solution, which is MA X FA 1－X PB 3 Perovskite Precursor Solution, MA X FA 1－ X PB 3 The concentration of the perovskite precursor solution is shown in Table 1;

[0050] (2) put MA X FA 1－X PB 3 Put the perovskite precursor solution into a small beaker and transfer it to a microwave reactor for heating. Set the power of the microwave reactor to 250W, control the heating temperature as shown in Table 2, and the heating time as sh...

Embodiment 4

[0056] Efficient preparation of perovskite microcrystals (MAPbI) by a microwave method 3 ) method, such as figure 1 shown, including the following steps:

[0057] (1) Weigh MAI (methylamine iodide, CH 3 NH 3 I), and PbI 2 (FAI+MAI and PbI 2 The molar ratio is 1:1), MAI and PbI 2 Dissolve in propylene carbonate, sonicate for 10min, and keep stirring for 30min to obtain a clear solution, which is MAPbI 3 Perovskite precursor solution, MAPbI 3 The concentration of the perovskite precursor solution is 0.45mol / L;

[0058] (2) MAPbI 3 Put the perovskite precursor solution into a small beaker and transfer it to a microwave reactor for heating. Set the power of the microwave reactor to 250W, control the heating temperature to 100°C, and the heating time to 10min;

[0059] (3) After the reaction is complete, from MAPbI 3 Black microcrystals are precipitated in the perovskite precursor solution, and the black microcrystals are filtered and washed to obtain crystals with metall...

Embodiment 5

[0061] Efficient preparation of perovskite microcrystals (MAPbI) by a microwave method 3 ) method, each step and the reagents involved in each step, parameters, etc. are the same as in Example 4, the difference is: the temperature of microwave heating in step (2) is changed to 100 ° C, and the time of microwave heating is changed to 20min.

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Abstract

The invention relates to the field of perovskite materials, and discloses a method for efficiently preparing perovskite microcrystals by a microwave method, and the general chemical formula of the perovskite microcrystals is MA X FA 1－X PB 3 , its preparation method comprises: (1) according to the molar mass ratio between each element of target product, weigh organic component and inorganic component, and organic component and inorganic component are dissolved in propylene carbonate, promptly obtain perovskite (2) Heating the perovskite precursor solution by microwave method, the heating temperature is controlled at 70-130°C, and the heating time is 10-30min; (3) After the reaction is complete, black microcrystals are precipitated, and after filtration and washing Perovskite crystallites were obtained. The present invention adopts the microwave method and a suitable perovskite precursor solvent to heat the inside and outside of the perovskite precursor solution at the same time quickly, uniformly and with low energy consumption, and raise the temperature at the same time, and crystallize evenly, so as to ensure the quality of the crystal and increase the yield .

Description

technical field [0001] The invention relates to the field of perovskite materials, in particular to a method for efficiently preparing perovskite microcrystals by microwave method and the photoelectric application of perovskite microcrystals. Background technique [0002] In recent years, organic-inorganic metal halide perovskite materials have been widely used in a variety of Photovoltaics, especially in the field of perovskite solar cells. At present, the highest certified efficiency record of perovskite solar cells has reached 25.5%, which is comparable to traditional crystalline silicon cells. Therefore, perovskite solar cells are regarded as one of the most promising new photovoltaic power generation products. [0003] With the rapid development of perovskite solar cells, the biggest challenge in the future commercialization process is how to realize the transformation from laboratory-scale small-area devices to large-area devices that can meet market demand. Large-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/14C30B29/12H01L51/42
CPCC30B7/14C30B29/12H10K30/10Y02E10/549
Inventor 匡代彬钟均星吴武强
Owner SUN YAT SEN UNIV
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