CsPbX3 perovskite nano-crystal and synthesis method thereof

A synthesis method and nanocrystal technology, applied in the field of materials, can solve the problems of unevenness and difficult control of grain size, etc.

Inactive Publication Date: 2020-01-14
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the embodiment of the present application is to provide a CsPbX 3 Perovskite nanocrystals and methods for their synthesis, which aim to improve the existing CsPbX 3 The grain size obtained by the preparation method of nanocrystals is not easy to control, and the problem of inhomogeneity

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  • CsPbX3 perovskite nano-crystal and synthesis method thereof
  • CsPbX3 perovskite nano-crystal and synthesis method thereof
  • CsPbX3 perovskite nano-crystal and synthesis method thereof

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[0028] CaB 3 Synthesis of perovskite nanocrystals, CsPbX 3 Synthesis methods of perovskite nanocrystals include:

[0029] Using liquid nitrogen or liquid helium with the generated CsPbX 3 Mix to cool CsPbX 3 Nanocrystalline.

[0030] X is one or both of Cl, Br and I, in other words, CsPbX 3 Can include CsPbCl 3 , CsPbBr 3 , CsPbI 3 , or CsPbBr n Cl 3-n , CsPbBr n I 3-n , CsPbI n Cl 3-n , where n is any value from 0-3.

[0031] The existing technology mainly cools CsPbX by ice water 3 , but the polar solution will severely damage the crystal structure of perovskite, so water cannot be directly added to the reaction solution for cooling, and the high-temperature solution can only be cooled through the container, which greatly reduces the cooling rate. Ice water cooling will stay in the low temperature stage for about 100 seconds, which is for CsPbX 3 It is quite a long time for the growth of perovskite nanocrystals.

[0032] The inventors try to use lower temper...

Embodiment 1

[0055] This embodiment provides a CsPbBr 1.5 Cl 1.5 Perovskite nanocrystals are mainly prepared through the following steps:

[0056] Place 0.1mmol of cesium carbonate, 0.5mmol of lead acetate, 1ml of oleic acid, 1ml of oleylamine, 1ml of tri-n-octylphosphine and 6ml of octadecene into a 100mml three-necked flask, fill with nitrogen and heat at 120°C for 1h.

[0057] Then the solution was heated to 180°C, 0.45ml HBr and 0.45ml HCl were quickly injected into the three-necked flask, and CsPbBr was rapidly generated 1.5 Cl 1.5 Nanocrystalline. After 15 seconds, add 100ml of liquid nitrogen to cool.

[0058] figure 1 shows the CsPbBr provided by Example 1 of the present application 1.5 Cl 1.5 The transmission electron microscope image, particle size statistics image and selected area diffraction image of perovskite nanocrystals; where a is the transmission electron microscope image, b is the particle size statistics image, and c is the selected area diffraction image; the s...

Embodiment 2

[0061] This embodiment provides a CsPbCl 3 Perovskite nanocrystals are mainly prepared through the following steps:

[0062] Place 0.1mmol of cesium carbonate, 0.5mmol of lead acetate, 1ml of oleic acid, 1ml of oleylamine, 1ml of tri-n-octylphosphine and 6ml of octadecene into a 100mml three-necked flask, fill with nitrogen and heat at 120°C for 1h.

[0063] Then the solution was heated to 180°C, 0.9ml HCl was quickly injected into the three-necked flask, and CsPbCl was rapidly generated 3 Nanocrystalline. After 15 seconds, add 100ml of liquid nitrogen to cool.

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Abstract

The invention relates to the field of materials, particularly to a CsPbX3 perovskite nano-crystal and a synthesis method thereof. The synthesis method comprises: carrying out a reaction on cesium carbonate, lead acetate, oleic acid, oleylamine, tri-n-octylphosphine and octadecene at 110-130 DEG C for 1-2 h, heating the solution to 175-185 DEG C, adding HX, carrying out a reaction, and then mixingthe reacted solution and liquid nitrogen or liquid helium to cool CsPbX3, wherein X is one or two selected from Cl, Br and I. According to the invention, by directly mixing the liquid nitrogen or liquid helium and the generated CsPbX3 nano-crystal to cool the CsPbX3 nano-crystal, the continuous growth of crystal grains formed at a high temperature can be avoided, the growth of small crystal grainsin the cooling process can be avoided, and the high-quality crystals with uniform grain sizes are obtained, so that the CsPbX3 nano-crystals have efficient photoelectric characteristics.

Description

technical field [0001] This application relates to the field of materials, in particular, to a CsPbX 3 Perovskite nanocrystals and methods for their synthesis. Background technique [0002] All-inorganic perovskite (CsPbX 3。 X=Cl, Br, and I) as a new semiconductor material, due to its excellent optical properties, such as high quantum yield, high color purity, long carrier diffusion length, by adjusting the particle size, In three dimensions, the ratio of halogens can adjust the size of its bandgap to emit colors covering the entire visible light, making it an important material in the fields of solar cells, photodetectors, flat-panel displays, and lighting. [0003] CaB 3 Nanocrystals are generated at high temperatures and undergo the required crystallization and nucleation within seconds. Then the chemical synthesis reaction needs to be stopped by cooling. Currently CsPbX 3 The grain size obtained by the preparation method of nanocrystals is not easy to control and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/665
Inventor 杨维清骆超付吉李文淳凤君谢美林高玥
Owner SOUTHWEST JIAOTONG UNIV
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