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A kind of preparation method of all-inorganic cesium lead halide perovskite nanocrystalline film

A cesium lead halide and perovskite technology, applied in the field of materials science, can solve the problem of single substrate selection

Active Publication Date: 2021-05-11
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 3) The base selection is relatively simple

Method used

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  • A kind of preparation method of all-inorganic cesium lead halide perovskite nanocrystalline film
  • A kind of preparation method of all-inorganic cesium lead halide perovskite nanocrystalline film
  • A kind of preparation method of all-inorganic cesium lead halide perovskite nanocrystalline film

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Embodiment 1

[0042] A method for preparing an all-inorganic cesium lead halide perovskite nanocrystalline film, specifically comprising the following steps:

[0043] (1) A preparation step of a precursor solution. Take 20mL N,N-dimethylformamide (DMF), 2mL oleic acid and 0.3mL oleylamine. The volume ratio of the above three reagents is 10:1:0.15. DMF, oleic acid and oleylamine are mixed at room temperature and ready to use; the purity of analytically pure CsBr and PbBr is weighed at a ratio of 1:1. 2 Add 1.6mmol of each powder into the mixed solution of DMF, oleic acid and oleylamine, the concentration of each solute is 0.08mol / L, stir for 15min, after standing still for 30min, centrifuge to get a clear solution, which is the preparation of perovskite nanocrystalline film. The required precursor solution;

[0044] (2) A preparation step of a perovskite nanocrystalline thin film, using ordinary glass as a thin film substrate, first cleaning the substrate with ethanol, then ultrasonic clean...

Embodiment 2

[0049] A method for preparing an all-inorganic cesium lead halide perovskite nanocrystalline film, specifically comprising the following steps:

[0050] (1) Preparation of precursor solution, take 20mL DMF, 2mL oleic acid and 0.3mL oleylamine, the volume ratio of the above three reagents is 10:1:0.15, mix DMF, oleic acid and oleylamine at room temperature and wait Use; according to the ratio of 1:0.1:0.9 to weigh the purity of analytically pure CsBr, PbBr 2 and PbI 2 Add 1.6mmol, 0.16mmol and 1.44mmol of the powder into the mixed solution of DMF, oleic acid and oleylamine, stir for 15min, and after standing for 30min, centrifuge to get the clear solution, which is the precursor required for the preparation of perovskite nanocrystalline film body solution;

[0051] (2) The preparation of perovskite nanocrystalline film, using ITO glass as the film substrate, the substrate is first cleaned with ethanol, then ultrasonically cleaned, and finally dried for use; the substrate is h...

Embodiment 3

[0056] A method for preparing an all-inorganic cesium lead halide perovskite nanocrystalline film, comprising the following steps:

[0057] 1) DMF, oleic acid and oleylamine are uniformly mixed in a volume ratio of 10:0.5:0.05 to obtain a mixed solution;

[0058] 2) CsCl, CsI and PbBr 2 Add to the mixed solution in step 1) at a molar ratio of 0.5:0.5:1, and after stirring for 10 minutes, standing for 25 minutes, and centrifuging, take a clear solution to obtain a CsCl and CsI concentration of 0.005mol / L , PbBr 2 The concentration is the precursor solution of 0.01mol / L;

[0059] 3) The FTO glass is cleaned with ethanol, ultrasonically cleaned, dried, and heated to 160°C, and then the precursor solution in step 2) is sprayed on the film substrate while it is hot through a high-pressure spray gun to obtain an all-inorganic cesium lead halide Perovskite nanocrystalline film;

[0060] Wherein, during the spraying process in step 3), the distance between the spray gun and the fi...

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Abstract

The invention relates to a preparation method of an all-inorganic cesium lead halide perovskite nanocrystalline film, comprising the following steps: 1) uniformly mixing DMF, oleic acid and oleylamine to obtain a mixed solution; 2) mixing CsX and PbY 2 Adding to the mixed solution in step 1) respectively, and successively stirring, standing, and centrifuging to obtain a precursor solution; 3) washing, drying, and heating the film substrate in sequence, and then spraying the precursor solution on the On the film substrate, an all-inorganic cesium lead halide perovskite nanocrystalline film is obtained; wherein, X and Y are one or more of Cl, Br, and I respectively. Compared with the prior art, the method can realize fast one-time film formation, has the advantages of simple operation, low cost, uniform distribution of the prepared nanocrystalline film, high crystal quality and good luminous performance, showing broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of materials science, and relates to a preparation method of an all-inorganic cesium lead halide perovskite nanocrystal film. Background technique [0002] All inorganic cesium lead halide compound CsPbX 3 (X=Cl, Br, I) perovskite materials have excellent optical properties, including high fluorescence quantum yield (~90%), narrow emission peak half-maximum width (12~42nm), and emission spectrum covering the entire visible wavelength (410~700nm), and the emission wavelength can be adjusted at will. In addition, the material also has good thermal stability and biocompatibility. Therefore, in recent years, this compound has attracted much attention in the field of luminescent materials. [0003] Currently, limiting CsPbX 3 (X=Cl, Br, I) The problem of the application of materials in the field of optoelectronic devices is mainly the lack of stability of the materials, and the CsPbX with high quantum lumines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/12C30B29/64C30B7/06C30B7/14
CPCC30B7/06C30B7/14C30B29/12C30B29/64
Inventor 张灿云彭小改陈进王凤超孔晋芳杨波波李澜刘启龙
Owner SHANGHAI INST OF TECH
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