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Preparation method of CsPb2Br5 inorganic perovskite nanosheet

A technology of nanosheets and inorganic calcium, which is applied in the direction of inorganic chemistry, chemical instruments and methods, lead compounds, etc., can solve the problems of limiting the continued growth of two-dimensional sheets, the inability to achieve large areas, and high reaction temperatures, and achieve industrial production and crystallization The effect of good performance and easy availability of raw materials

Inactive Publication Date: 2018-05-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Literature reports (Xiaosheng Tang, Zhiping Hu, et al..Advanced Optical Materials, 2016,5(3):1-7), (KunHua Wang, Liang Wu, et al..Angew.Chem.2016,55:8328-8332) synthesized CsPb 2 Br 5 All-inorganic perovskite sheets, but there are the following problems: First, the size of the obtained perovskite sheets is about 4.5 μm, the thickness is 0.3-1.8 μm, and the uniformity is poor; The method has harsh conditions and high reaction temperature; third, the addition of long-chain amine ligands in the preparation process limits the continued growth of two-dimensional sheets, making it impossible to achieve large-area

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  • Preparation method of CsPb2Br5 inorganic perovskite nanosheet
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  • Preparation method of CsPb2Br5 inorganic perovskite nanosheet

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[0025] A CsPb 2 Br 5 A method for preparing an inorganic perovskite nanosheet, comprising the following steps:

[0026] Step 1, equimolar cesium bromide (CsBr) and lead bromide (PbBr 2 ) into 5 mL of dimethyl sulfoxide, and stirred to react to obtain a mixed solution with a concentration of 20 to 70 mmol / L; then add 10 to 20 μL of n-octanoic acid to the mixed solution to obtain a precursor solution;

[0027] Step 2, methanol and ethanol are mixed according to the volume ratio of (0.6-1.5): 1, to obtain 8-10L anti-solvent solution;

[0028] Step 3, the silicon dioxide substrate is ultrasonically cleaned in acetone and ethanol in sequence, and then cleaned by ozone plasma;

[0029] Step 4. Place the substrate cleaned in step 3 on the stage, and then put the substrate and the stage together into a glass jar; take 10-30 μL of the precursor solution prepared in step 1 and add it dropwise to the cleaned on a silicon dioxide substrate;

[0030] Step 5. After adding 8-10L of the ...

Embodiment 1

[0035] A CsPb 2 Br 5 A method for preparing an inorganic perovskite nanosheet, comprising the following steps:

[0036] Step 1, the CsBr and PbBr of 0.25mmol 2 Dissolve in 5mL dimethyl sulfoxide solvent, stir and react, and prepare a mixed solution with a concentration of 50mmol / L; then add 10 μL n-octanoic acid to the mixed solution, and mix well to obtain a precursor solution;

[0037] Step 2, methanol and ethanol are mixed according to the volume ratio of 1:1 to obtain 10L of anti-solvent solution;

[0038] Step 3, ultrasonically clean the silicon dioxide substrate in acetone and ethanol for 15 minutes, and then clean it with ozone plasma for 5 minutes;

[0039] Step 4. Place the substrate cleaned in step 3 on the stage, and then put the substrate and the stage together into a glass jar; take 20 μL of the precursor solution prepared in step 1 and add it dropwise to the cleaned substrate in step 3 on a silicon dioxide substrate;

[0040] Step 5. Add 10L of the anti-solv...

Embodiment 2

[0042] The difference between this embodiment and embodiment 1 is that the standing time in step 5 is 24h, and the rest of the operations are the same as in embodiment 1.

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Abstract

The invention provides a preparation method of a CsPb2Br5 inorganic perovskite nanosheet, and belongs to the technical field of preparation of inorganic nano-materials. According to the invention, a precursor solution is dropwise added on a substrate, and then is sealed and stood in a glass pot with an anti-solvent so as to obtain the CsPb2Br5 inorganic perovskite nanosheet. The CsPb2Br5 inorganicperovskite nanosheet provided by the invention has uniform morphology dimension and good crystallization property; and the preparation of an oversized nanosheet with dimension of 120 mu m and thickness of 125 nm is realized. Meanwhile, the preparation method provided by the invention has the advantages of simple technology, low cost, easily available raw material, mild reaction condition, and canbe performed under normal temperature and normal pressure, and is conducive to realization of the industrial production of large-area perovskite nanosheets.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanomaterials, in particular to a CsPb 2 Br 5 Preparation method of inorganic perovskite nanosheets. Background technique [0002] Organic-inorganic hybrid perovskite has excellent photoelectric properties, and its application in solar cells can increase the conversion efficiency of the cell from 3.8% to 20%, which has attracted more and more attention from researchers. However, organic-inorganic hybrid perovskite is extremely unstable to oxygen, light, and heat, which puts forward higher requirements for the preparation of organic-inorganic hybrid perovskite solar cells. [0003] The all-inorganic metal halide perovskite not only has good oxygen, light, and thermal stability, but also has excellent optoelectronic properties, and is a new type of perovskite optoelectronic material. Literature reports (Xiaosheng Tang, Zhiping Hu, et al..Advanced Optical Materials, 2016,5(3):1-7)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00
CPCC01G21/006C01P2002/34C01P2002/72C01P2004/03C01P2004/04C01P2004/20C01P2004/60C01P2004/62
Inventor 熊杰李政翰杜新川储隽伟晏超贻戴丽萍邬春阳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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