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Synthesis method of ABX3 perovskite nanocrystals and product and application thereof

A synthesis method and nanocrystal technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of instability, destruction of perovskite crystal structure, sensitivity, etc., and achieve a wide range of choices and a simple and easy synthesis method OK, good stability

Pending Publication Date: 2018-06-29
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this method is that the synthesis is simple and efficient, and the synthesis cycle is short; the disadvantage is that the synthesized perovskite nanocrystals are very sensitive to polar solvents, and are easily dissociated to destroy the crystal structure of the perovskite, and it is difficult to control the particle size growth rate
[0006] 3. Ion exchange reaction (Ion exchange reaction): such as "Akkerman Q A, D'Innocenzo V, Accornero S, et al. Tuning the Optical Properties of Cesium Lead Halide Perovskite Nanocrystals by Anion Exchange Reactions [J]. Journal of the American Chemical Society, 2015, 137 (32): 10276-81." discloses, anion exchange method is a kind of method for post-treatment reaction of rapid exchange in nanocrystal solution, by adding and containing different kinds of halide ion compound and mix and stir preparation, the advantage of this method is It will not change the crystal form and morphology of pure inorganic perovskite nanocrystals; the disadvantage is that the quantum yield is not high and unstable

Method used

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  • Synthesis method of ABX3 perovskite nanocrystals and product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A CsPbBr 3 Synthesis method of perovskite nanowires:

[0050] 1) 0.3303g PbBr 2 , 0.75mL oleic acid (OA), 1.5mL oleylamine (OAm), and 15mL octadecene (ODE) were added to a 50mL three-necked flask, a temperature probe, a rubber stopper, and a condenser tube were installed, and then vigorously stirred at a speed of 500 to 700rpm; Set the heating temperature to 50°C, then evacuate it to below 1400Pa, and then pass argon for 5 to 10 minutes, repeat three times and continue to pass argon to react; reset the heating temperature to 100°C, and wait for the temperature to stabilize to 100~ When the temperature is between 120°C, keep the reaction for 50 minutes until the solution becomes clear and transparent, then place the flask in an ice-water bath and quickly cool down to 50°C to obtain the Pb precursor solution;

[0051] 2) 0.0977g CsCO 3 , 0.75mL oleic acid (OA), 15mL octadecene (ODE) was added in a 50mL three-necked flask, a temperature probe, a rubber stopper, and a co...

Embodiment 2

[0056] A MAPbCl 3 Synthesis method of perovskite nanowires:

[0057] 1) The preparation of the Pb precursor solution is similar to Example 1, Pb in the Pb precursor solution 2+ The ion concentration is 0.01mol / L;

[0058] 2) will MA + Dissolve 0.75mL of oleic acid (OA), add 15mL of octadecene (ODE) into a 50mL three-necked flask, install a temperature probe, rubber stopper, and condenser tube, and then vigorously stir at a speed of 500-700rpm; follow step 1) similar operation , get MA + A precursor solution with a concentration of 0.01mol / L;

[0059] 3) Cl - -Preparation of oleylamine mixed precursor solution and Br in embodiment 1 - -The preparation of oleylamine mixed precursor is similar, Cl - The concentration is 0.03mol / L;

[0060] 4) Add 1mL, 1.5mL, and 0.5mL of the precursor solutions prepared in steps 1) to 3) into a 10mL centrifuge tube, and then pour 6mL of equal volumes of chloroform and isopropanol into a 1:5 volume ratio. Polar solvent, shake vigorously f...

Embodiment 3

[0062] A FASnBr 3 Synthesis method of perovskite nanorods:

[0063] 1) The preparation of the Sn precursor solution is similar to the preparation of the Pb precursor solution in Example 1; in the Sn precursor solution, Sn 2+ The ion concentration is 0.3mol / L;

[0064] 2) the FA + Dissolve 20mL of oleic acid (OA) into a 50mL three-neck flask, install a temperature probe, rubber stopper, and condenser tube, and then vigorously stir at a speed of 500-700rpm; follow the similar operation in step 1) to obtain FA + A precursor solution with a concentration of 0.1mol / L;

[0065] 3)Br - -Preparation of oleylamine mixed precursor solution and Br in embodiment 1 - -The preparation of the oleylamine mixed precursor is similar, the difference is that the salt used is NaBr, and the Br in the resulting precursor - The concentration is 0.15mol / L;

[0066] 4) Add 1mL, 0.5mL, and 1.5mL of the precursor solutions prepared in steps 1) to 3) into a 10mL centrifuge tube, and then pour 6mL o...

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Abstract

The invention relates to a synthesis method of ABX3 perovskite nanocrystals and a product and application thereof. The synthesis method comprises the following steps: mixing an A ion precursor, a B ion precursor and an X ion precursor at room temperature, and adding a mixture into a mixed polar solvent to grow the ABX3 perovskite nanocrystals, wherein A ions include any one or a combination of atleast two of CH3NH3<+>, HC(NH2)2<+> and Cs<+>; B ions include Pb<2+> and / or Sn<2+>; X ions include any one or a combination of at least two of Cl<->, Br<-> and I<->; a long-chain ligand comprises anyone or a combination of at least two of oleic acid, oleylamine and octadecene; the mixed polar solvent contains a polar protic solvent, and further contains a weakly polar solventand / or a non-polar solvent. By the synthesis method, the ABX3 perovskite nanocrystals can be rapidly separated out at room temperature, surface passivation is complete, the quantum yield is high, and the selection range of the polar solvent is wide.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to an ABX 3 Synthesis methods of perovskite nanocrystals and their products and uses. Background technique [0002] As an emerging optoelectronic material, perovskite has been used in the photovoltaic field to prepare dye-sensitized cells since 2009, and its photoelectric conversion efficiency has grown rapidly from 3.8% to over 20%. In the field of optoelectronic devices, from LED light-emitting devices, photodetector devices to laser devices, field effect transistors, etc., perovskite also has great application potential, showing excellent device performance. In general, perovskite materials can be used with ABX 3 The chemical formula indicates that the A position is a cation (MA + 、FA + 、Cs + etc.), the B site is a heavy metal ion (Pb 2+ , Sn 2+ etc.), the X position is a halide ion (Cl - 、Br - , I - ). According to the difference of A-site cations, perov...

Claims

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Application Information

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IPC IPC(8): C01G21/00C01G19/00B82Y30/00B82Y40/00
CPCC01G21/006B82Y30/00B82Y40/00C01G19/006C01P2002/34C01P2002/54C01P2004/04C01P2004/16
Inventor 孙小卫王恺温佐良汪召锦周子明方凡
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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