Alpha-FAPbI3 perovskite quantum dot, preparation method and photoelectric device

A quantum dot and perovskite technology, applied in α-FAPbI3 perovskite quantum dots and their preparation, in the field of optoelectronic devices, can solve the problems of difficulty in synthesizing perovskite quantum dots, poor storage stability, etc., and reduce the concentration of defect states. , high stability, high PLQYs effect

Active Publication Date: 2022-06-21
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0005] The purpose of this application is to provide a kind of α-FAPbI3 perovskite quantum dot and its preparation method, and a kind of optoelectronic device, It aims to solve the problem that it is difficult to synthesize single-component α-FAPbI3 perovskite quantum dots in the existing technology, and the problem of poor storage stability

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  • Alpha-FAPbI3 perovskite quantum dot, preparation method and photoelectric device
  • Alpha-FAPbI3 perovskite quantum dot, preparation method and photoelectric device

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[0029] as attached figure 1 As shown, the first aspect of the embodiments of the present application provides an α-FAPbI 3 The preparation method of perovskite quantum dots includes the following steps:

[0030] S10. Formamidine iodide (FAI) and lead iodide (PbI) 2 ) is dissolved in the solvent to obtain a mixed solution;

[0031] S20. Dissolving organic carboxylic acid oleic acid (OA), organic amine oleylamine (OAm) and short-chain organic carboxylic acid in a mixed solution to obtain a precursor solution; the carbon chain length of the short-chain organic carboxylic acid is 1-4;

[0032] S30. After adding the precursor solution to the anti-solvent for mixing, separation and purification to obtain α-FAPbI 3 Perovskite quantum dots.

[0033] The first aspect of the embodiments of the present application provides α-FAPbI 3 Preparation method of perovskite quantum dots using formamidinium iodide (FAI) and lead iodide (PbI) 2 ) as a raw material, after dissolving it in a so...

Embodiment 1

[0055] an α-FAPbI 3 The preparation of perovskite quantum dots includes the steps:

[0056] ①Formamidine iodide (FAI) and lead iodide (PbI) in a ratio of 0.3:1 2 ) dissolved in dimethyl sulfoxide (DMSO) solvent and stirred until completely dissolved; lead iodide (PbI 2 ) at an initial concentration of 0.01 mol / L, wherein the volume of dimethyl sulfoxide (DMSO) solvent was 0.2 mL; then, organic carboxylic acid oleic acid (OA) and organic amine oleylamine (OAm) were sequentially added and stirred to dissolve, Among them, the addition amount of organic carboxylic acid oleic acid (OA) and lead iodide (PbI 2 ) substance ratio is 0.4:1, the addition amount of organic amine oleylamine (OAm) and lead iodide (PbI 2 ) substance ratio is 0.3:1; finally, add short-chain organic carboxylic acid acetic acid, short-chain organic carboxylic acid acetic acid and lead iodide (PbI 2 ) and the substance ratio is 8:1, stir at room temperature for 1-2min and fully dissolve to obtain FAPbI 3 Pr...

Embodiment 2

[0060] an α-FAPbI 3 The preparation of perovskite quantum dots includes the steps:

[0061] ①Formamidine iodide (FAI) and lead iodide (PbI) in a ratio of 0.3:1 2 ) dissolved in N,N-dimethylformamide (DMF) solvent and stirred until completely dissolved; lead iodide (PbI 2 ) at an initial concentration of 0.01 mol / L, in which the volume of N,N-dimethylformamide (DMF) solvent was 0.2 mL; then, organic carboxylic acid oleic acid (OA) and organic amine oleylamine (OAm) were added sequentially And stir and dissolve, wherein, the addition amount of organic carboxylic acid oleic acid (OA) is the same as that of lead iodide (PbI 2 ) substance ratio is 0.4:1, the addition amount of organic amine oleylamine (OAm) and lead iodide (PbI 2 ) substance ratio is 0.3:1; finally, add short-chain organic carboxylic acid acetic acid, short-chain organic carboxylic acid acetic acid and lead iodide (PbI 2 ) and the substance ratio is 8:1, stir at room temperature for 1-2min and fully dissolve to...

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Abstract

The invention belongs to the technical field of perovskite materials, and particularly relates to an alpha-FAPbI3 perovskite quantum dot, a preparation method thereof and a photoelectric device. The preparation method of the alpha-FAPbI3 perovskite quantum dot comprises the following steps: dissolving formamidine iodine and lead iodide in a solvent to obtain a mixed solution; dissolving organic carboxylic acid oleic acid, organic amine oleylamine and short-chain organic carboxylic acid in the mixed solution to obtain a precursor solution; the carbon chain length of the short-chain organic carboxylic acid is 1-4; and adding the precursor solution into an anti-solvent, carrying out mixing treatment, and carrying out separation and purification to obtain the alpha-FAPbI3 perovskite quantum dot. According to the preparation method, the organic carboxylic acid oleic acid and the organic amine oleylamine are used as synergistic passivation ligands to effectively reduce the surface defect concentration, meanwhile, the short-chain organic carboxylic acid is introduced to inhibit the crystal nucleation speed and inhibit the agglomeration between the quantum dots, a ligand protection layer is formed on the surfaces of the quantum dots, and the stability and the luminescence property of the perovskite quantum dots are improved.

Description

technical field [0001] The application belongs to the technical field of perovskite materials, and in particular relates to a kind of α-FAPbI 3 Perovskite quantum dots and preparation method thereof, and an optoelectronic device. Background technique [0002] FAPbI 3 Perovskite materials, as a class of semiconductor fluorescent materials with excellent optoelectronic properties, low fabrication cost, and suitable band gaps, have promising optoelectronic application prospects. Compositionally, FAPbI 3 The perovskite structure is a typical ABX 3 type perovskite structure, the A site is an FA with large size + , the B bit is Pb 2+ , the X position is the halide ion I - . In nature, FAPbI 3 Perovskites have high fluorescence quantum yields (PLQYs), high absorption coefficients, tunable band gaps, and superior thermal stability, and are currently one of the preferred materials for the fabrication of high-performance perovskite solar cells. Structurally, it usually has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00B82Y40/00H01L51/42H01L51/46
CPCC09K11/02C09K11/664B82Y20/00B82Y30/00B82Y40/00H10K30/30Y02E10/549
Inventor 薛冬峰徐珂
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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