Preparation method of Cs4PbBr6 perovskite nanocrystal with size and shape controllable

A perovskite and nanocrystal technology, applied in the field of preparation of Cs4PbBr6 perovskite nanocrystals, can solve the problems of less research on type perovskite nanocrystals, limited understanding of type perovskite nanocrystals, and backward controllable preparation. To achieve the effect of controllable morphology, easy adjustment of product size and simple operation

Inactive Publication Date: 2018-09-04
JILIN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, published reports mainly focus on the purely inorganic CsPbX 3 Perovskite nanocrystals, by contrast, for Cs 4 wxya 6 There is relatively little research on the type perovskite nanocrystals, and its controllable preparation is still far behind.
This also leads to the current 4 wxya 6 The understanding of type perovskite nanocrystals is still very limited, there are unresolved problems and defects, and the technology needs to be innovated and improved.

Method used

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  • Preparation method of Cs4PbBr6 perovskite nanocrystal with size and shape controllable
  • Preparation method of Cs4PbBr6 perovskite nanocrystal with size and shape controllable
  • Preparation method of Cs4PbBr6 perovskite nanocrystal with size and shape controllable

Examples

Experimental program
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Effect test

Embodiment 1

[0024] First, a cesium oleate solution is prepared. Take 2mmol (0.648g) of cesium carbonate powder, 10mmol (3.35mL) of OA (oleic acid) and 6.65mL of ODE (octadecene) and mix them, heat to 150°C under nitrogen protection to dissolve cesium carbonate, cool to 100 ℃, prepared into 0.2M cesium oleate solution, which was light yellow transparent solution.

[0025] Then take 0.2mmol of lead bromide solid powder, 0.5mL of oleylamine, 0.5mL of oleic acid and 3mL of octadecene into a three-necked flask, vacuumize at 50°C for 30 minutes, fill with nitrogen protection, and then heat up to 150°C. After the lead bromide is dissolved, cool down to room temperature 25°C, then inject 0.2mL of 0.2M cesium oleate octadecene solution, and react for 30 minutes to obtain 0.04mmol of CsPbBr with an absorption peak at 402nm 3 Nanoclusters, whose absorption spectrum is shown in figure 1 , the resulting product was purified by centrifugation at 10,000 r / min for 5 minutes, and then dispersed into 1 m...

Embodiment 2

[0027] Dilute 0.3 mL of 0.2 M cesium oleate octadecene solution with 4 mL of octadecene, heat to 100 ° C, and then 1 mL of CsPbBr prepared in Example 1 3 The octadecene dispersion of nanoclusters was injected into the above-mentioned cesium oleate solution at 100°C, and reacted for 1 minute to obtain Cs with a size of 9.8nm 4 PbBr 6 Nanoparticles, whose electron micrographs are shown in figure 2 , the whole process does not need the protection of nitrogen conditions.

Embodiment 3

[0029] Dilute 0.3 mL of 0.2 M cesium oleate octadecene solution with 4 mL of octadecene, heat to 150 ° C, and then 1 mL of CsPbBr prepared in Example 1 3 The octadecene dispersion of nanoclusters was injected into the cesium oleate solution at 150°C, and reacted for 1 minute to obtain Cs with a size of 16 nm. 4 PbBr 6 Nanoparticles, whose electron micrographs are shown in image 3 , the whole process does not need the protection of nitrogen conditions.

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Abstract

The invention discloses a preparation method of Cs4PbBr6 perovskite nanocrystals with size and shape controllable, and belongs to the technical field of semiconductor nanomaterial preparation. The method comprises the steps that a caesium carboxylate solution is added into a lead bromide solution protected by N2, reaction is conducted under room temperature to synthesize CsPbBr3 nano clusters, andthermal injection is conducted on the CsPbBr3 nano clusters into the caesium carboxylate solution to obtain the Cs4PbBr6 perovskite nanocrystals. The preparation method has the advantages of simple operation, easy adjustment of the size of products, control of the shape of the products and the like.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation, and relates to a Cs with controllable size and shape 4 PbBr 6 Preparation methods of perovskite nanocrystals. Background technique [0002] In recent years, perovskite nanocrystals, especially lead halide perovskite nanocrystals, stand out in the applications of solar cells, LEDs, lasers, and photodetectors because of their excellent charge transport properties and good chemical controllability. Especially in the field of solar cells, its photoelectric conversion efficiency can reach 20%. At present, the preparation method of organic-inorganic hybrid lead halide perovskite nanocrystals is basically to use highly polar DMF or DMSO as a solvent to synthesize. The pure inorganic cesium lead halide perovskite nanocrystals are prepared by high-temperature hot injection method, and their controllable preparation can be realized by adjusting different reaction temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G21/006C01P2002/34C01P2002/72C01P2004/16C01P2004/61C01P2004/62C01P2004/64
Inventor 解仁国黄祥冰刘峰张颖杨文胜
Owner JILIN UNIV
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