A kind of preparation method of cspb2br5 inorganic perovskite nano sheet

A technology of nanosheets and inorganic calcium, 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 realize large areas, and high reaction temperature, and achieve industrial production and crystallization The effect of good performance and easy availability of raw materials

Inactive Publication Date: 2019-05-10
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, etal..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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  • A kind of preparation method of cspb2br5 inorganic perovskite nano sheet
  • A kind of preparation method of cspb2br5 inorganic perovskite nano sheet
  • A kind of preparation method of cspb2br5 inorganic perovskite nano sheet

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preparation example Construction

[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 5mL dimethyl sulfoxide, stirred and reacted to obtain a mixed solution with a concentration of 20-70 mmol / L; then 10-20 μL n-octanoic acid was added 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 substrate. on a silicon dioxide substrate;

[0030] Step 5. Add 8-10L of the anti-so...

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 CsPb 2 Br 5 The invention discloses a method for preparing inorganic perovskite nanosheets, belonging to the technical field of inorganic nanometer material preparation. In the present invention, the precursor solution is dripped onto the substrate, and then sealed and left in a glass tank with anti-solvent to obtain CsPb on the substrate. 2 Br 5 Nanosheets. CsPb obtained by the present invention 2 Br 5 The shape and size of perovskite nanosheets are uniform, and the crystallization performance is good; and the preparation of ultra-large nanosheets with a size of 120 μm and a thickness of 125 nm has been realized. At the same time, the method of the present invention has simple process, low cost, simple and easy-to-obtain raw materials, mild reaction conditions, and can be carried out under normal temperature and pressure, which is beneficial to realize the industrialized 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 & AuthorityPatents(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
OwnerUNIV OF ELECTRONICS SCI & TECH OF CHINA