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Method for improving stability of all-inorganic perovskite quantum dots CsPbBr3

A technology of quantum dots and inorganic calcium, applied in the field of materials science, can solve problems such as constraints and instability, and achieve the effects of improving stability, improving electrical conductivity and strong controllability

Active Publication Date: 2020-04-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CsPbBr 3 Quantum dot materials decompose in water and are extremely unstable. This problem seriously restricts the development of this material in the above application fields. Therefore, enhancing the water stability of perovskite quantum dots has become a research hotspot.

Method used

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  • Method for improving stability of all-inorganic perovskite quantum dots CsPbBr3
  • Method for improving stability of all-inorganic perovskite quantum dots CsPbBr3
  • Method for improving stability of all-inorganic perovskite quantum dots CsPbBr3

Examples

Experimental program
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Effect test

Embodiment 1

[0028] An improved all-inorganic perovskite quantum dot CsPbBr 3 The method of stability includes the following steps:

[0029] Step 1: The PbBr 2 Mix with octadecene in a molar ratio of 0.007:1 to obtain solution I;

[0030] Step 2: in an inert environment, add oleylamine and oleic acid in a volume ratio of 1:1 to the solution I obtained in step 1 to obtain solution II;

[0031] Step 3: Raise the reaction temperature of solution II to 160°C, then quickly add the cesium precursor solution to solution II, keep this temperature for 5 seconds, then cool down with an ice-water bath, centrifuge and precipitate, and then disperse the quantum dots in the solution II. 20mL of toluene to obtain CsPbBr 3 quantum dot solution;

[0032] Step 4: Add 35 mg of pyrrole and 40 mg of benzoquinone to the CsPbBr obtained in step 3 3 into the quantum dot solution, and then add 20 mL of chloroform to obtain a reaction system;

[0033] Step 5: use a 500W xenon lamp as the light source, install...

Embodiment 2

[0040] The only difference between this example and Example 1 is that the amount of pyrrole added is 30 mg, and the rest of the contents are exactly the same as those described in Example 1. Known through detection and analysis: the polypyrrole obtained in this example

[0041] / CsPbBr 3 The photocurrent density of the sample under the same conditions is pure CsPbBr 3 1.5 times that of quantum dots, which is lower than the photocurrent density of the material obtained in Example 1.

Embodiment 3

[0043] The only difference between this example and Example 1 is that the amount of benzoquinone added is 35 mg, and the rest of the content is exactly the same as that described in Example 1. Known through detecting and analyzing: the polypyrrole obtained in the present embodiment

[0044] / CsPbBr 3 The photocurrent density of the sample under the same conditions is that of pure CsPbBr 3 1.9 times that of quantum dots, and the photocurrent density of the material obtained in Example 1 has decreased.

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Abstract

The invention discloses a method for improving the stability of all-inorganic perovskite quantum dots CsPbBr3. The method comprises the following steps: mixing PbBr2 and octadecene to obtain a solution I; adding oleylamine and oleic acid to obtain a solution II; heating, adding a cesium precursor solution into the solution II, cooling with an ice-water bath, centrifuging, precipitating, and dispersing quantum dots into the organic solvent to obtain a CsPbBr3 quantum dot solution; adding pyrrole and benzoquinone into the CsPbBr3 quantum dot solution, and adding chloroform to obtain a reaction system; and carrying out illumination by using a xenon lamp as a light source, carrying out centrifugation, and carrying out vacuum drying. According to the preparation method, the surface of CsPbBr3 quantum dots is coated with a polypyrrole protection layer, so that the stability of the CsPbBr3 quantum dot in water is greatly improved, wherein polypyrrole has excellent charge transmission characteristics, can improve the conductivity of the material, and can be applied to photoelectric materials of high-performance devices.

Description

technical field [0001] The invention belongs to the field of materials science, and particularly relates to a method for improving the stability of an all-inorganic perovskite quantum dot CsPbBr3. Background technique [0002] All-inorganic perovskite quantum dots are widely used in solar cell modules, light-emitting diodes, sensors and other fields due to their high quantum yield, emission wavelength covering the entire visible spectrum, and relatively narrow half-width. [0003] All-inorganic perovskite quantum dots CsPbBr 3 Due to its excellent optoelectronic properties, it has a wide range of applications in photovoltaic and optoelectronic fields, and has achieved breakthrough research results. But CsPbBr 3 Quantum dot materials are extremely unstable due to water decomposition, which seriously restricts the development of these materials in the above application fields. Therefore, enhancing the water stability of perovskite quantum dots has become a research hotspot. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00Y02E10/549
Inventor 张志洁刘隆辉徐家跃沈涛
Owner SHANGHAI INST OF TECH
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