Method for synthesizing CsPbI3 perovskite nanocrystals by using room-temperature non-polar solvent system

A non-polar solvent, nanocrystal technology, applied in nanotechnology, chemical instruments and methods, lead compounds, etc., can solve the problems of difficult purification, easy ion migration, poor phase stability, etc., to achieve low cost, high yield, High-quality and stable compositing effects

Inactive Publication Date: 2020-06-12
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to poor phase stability, difficulty in purification, and easy migration of ions, CsPbI 3 There are few reports on room temperature synthesis of nanocrystals

Method used

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  • Method for synthesizing CsPbI3 perovskite nanocrystals by using room-temperature non-polar solvent system
  • Method for synthesizing CsPbI3 perovskite nanocrystals by using room-temperature non-polar solvent system
  • Method for synthesizing CsPbI3 perovskite nanocrystals by using room-temperature non-polar solvent system

Examples

Experimental program
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Embodiment 1

[0029] (1) ultrasonically dissolve 1mmol PbI in 20ml toluene 2 , 2mmol tetraoctyl ammonium iodide, obtain the Pb precursor;

[0030] (2) Dissolve 0.3mmol cesium carbonate (CsCO 3 ), to obtain the Cs precursor;

[0031] (3) ultrasonically dissolve 0.3 mmol oleylamine iodine in 10 mL of toluene solution;

[0032] (4) Inject the Cs precursor into the lead precursor with a syringe, stir and react for 4min, add 3mL oleylaminoiodotoluene solution, and stir for 4min to obtain CsPbI 3 Nanocrystalline stock solution;

[0033] (5) Add 30mL of ethyl acetate to the above-mentioned nanocrystal stock solution, centrifuge to take the precipitate, disperse the precipitate with 6mL of n-hexane, and obtain CsPbI 3 Nanocrystalline.

Embodiment 2

[0035] Using the same process as in Example 1, the difference is that the cesium carbonate in step 2) of Example 1 is replaced with cesium acetate, and other conditions remain the same.

Embodiment 3

[0037] Using the same process as in Example 1, the difference is that the amount of each raw material is 15 times that of Example 1, and other conditions remain the same.

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Abstract

The invention discloses a method for synthesizing CsPbI3 perovskite nanocrystals by using a room-temperature non-polar solvent system. The method comprises the following steps: dissolving lead iodideand tetraoctylammonium iodide in toluene to form a lead precursor, dissolving a cesium salt in a long-chain organic acid to obtain a cesium precursor, injecting the cesium precursor into the lead precursor, carrying out a reaction, adding an iodine-rich ligand toluene solution, and purifying the mixed solution with a flocculant to obtain the CsPbI3 nanocrystal. According to the method, under the condition of room temperature, an iodine-rich ligand passivation method is adopted in a toluene solution, so that the gamma-CsPbI3 nanocrystalline which is low in cost, high in yield and high in quality is stably synthesized at room temperature.

Description

technical field [0001] The invention relates to a room temperature non-polar solvent system for synthesizing CsPbI 3 A perovskite nanocrystal method belongs to the technical field of photoelectric semiconductor material preparation. Background technique [0002] Halide perovskite has the excellent characteristics of continuously adjustable band gap in visible light, high carrier mobility, long carrier migration distance and high quantum yield. It is used in solar cells, light-emitting diodes (LEDs) and photodetectors. and other fields are widely used. The traditional preparation methods of perovskite nanocrystals are hot injection method (Nano lett., 2015, 15, 3692) and room temperature polar solution synthesis method (ACS nano, 2015, 9, 4533). The former requires high temperature and inert gas protection. , the cost is high, and it is not suitable for large-scale production, and the performance of the latter nanocrystals is greatly weakened by the damage of polar solvents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00B82Y40/00C09K11/66
CPCC01G21/006B82Y40/00C09K11/665C01P2006/60C01P2002/84C01P2002/72
Inventor 宋继中王田田李金航杨林翔张百松赵永丽
Owner NANJING UNIV OF SCI & TECH
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