Method for preparing photoelectric material CsPbBr3

A technology of photoelectric materials and raw materials, which is applied in chemical instruments and methods, inorganic chemistry, tin compounds, etc., can solve the problems of restricting the mass production of CsPbBr3, high price, etc., and achieve the problem of overcoming instability, low price, and simple preparation of raw materials Effect

Inactive Publication Date: 2016-08-24
CHANGAN UNIV
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Problems solved by technology

This preparation method is simple in process, but requires expensive organic reagents
At the same time, th...

Method used

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  • Method for preparing photoelectric material CsPbBr3
  • Method for preparing photoelectric material CsPbBr3
  • Method for preparing photoelectric material CsPbBr3

Examples

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Embodiment 1

[0032] First, 0.758g Pb(CH 3 COO) 2 Dissolve in 8 mL of HBr solution at 30 °C; dissolve 0.851 g of CsBr in 4 mL of HBr at 30 °C 2 O and 8mL HBr solution in a mixed solution. Mix the two prepared solutions, where Cs + with Pb 2+ The molar ratio is 2:1, and the orange-red CsPbBr is obtained after reaction at 40 °C for 1 h 3 Precipitate, filter the precipitate and wash it repeatedly with absolute ethanol 3 times, then place the washed product in a vacuum oven and dry it at 50°C for 3 hours to obtain CsPbBr 3 .

[0033] The mass percent concentration of the HBr solution mentioned in this embodiment is 48%.

[0034] figure 1 For the prepared CsPbBr 3 X-ray diffraction pattern of . All diffraction peaks correspond to CsPbBr 3 The standard XRD spectrum of the product shows high purity and no impurity phase.

[0035] figure 2 For the prepared CsPbBr 3 The UV-Vis absorption spectrum of figure 2 It can be calculated that the prepared CsPbBr 3 The forbidden band width is 2...

Embodiment 2

[0037] First, 0.758g Pb(CH 3 COO) 2 Dissolve in 8 mL of HBr solution at 40 °C; dissolve 2.553 g of CsBr in 12 mL of HBr at 30 °C 2 O and 12mL HBr solution in a mixed solution. Mix the two prepared solutions, where Cs + with Pb 2+ The molar ratio is 6:1, and the orange-red CsPbBr is obtained after 1 h reaction at 40 °C 3 Precipitate, filter the precipitate and wash it repeatedly with absolute ethanol 3 times, then place the washed product in a vacuum oven and dry it at 60°C for 2 hours to obtain CsPbBr 3 .

[0038] The mass percent concentration of the HBr solution mentioned in this embodiment is 48%.

[0039] image 3 For the prepared CsPbBr of embodiment two 3 X-ray diffraction pattern of . All diffraction peaks correspond to CsPbBr 3 The standard XRD spectrum of the product shows high purity and no impurity phase.

[0040] Adopt the method proposed by the present invention to prepare CsPbBr 3 , it is necessary to precisely control the Cs in the mixed solution 2+...

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Abstract

The invention discloses a method for preparing photoelectric material CsPbBr3. The method includes the steps that an HBr water solution with Pb2+ and an HBr water solution with Cs+ are mixed at the certain temperature, and after a reaction is completed, reacting products are washed and subjected to vacuum drying, and CsPbBr3 polycrystal powder is finally obtained. According to the method, the ion strength of the solution is adjusted by controlling the molar ratio of Cs+/Pb2+, the problem that CsPbBr3 is instable in the water environment is solved, and therefore a single-phase CsPbBr3 material can be prepared in the water solution. The method is simple in preparing technology, low in used raw-material cost and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of semiconductor material preparation technology, in particular to a photoelectric material CsPbBr 3 method of preparation. Background technique [0002] CbBr 3 Semiconductor material is a new type of photoelectric material, which has the advantages of high carrier mobility, long diffusion length, strong light absorption ability, high luminous efficiency and good photostability. Due to its good photoelectric properties, CsPbBr 3 The preparation and study of its photoelectric properties have become a research hotspot in recent years. Currently, researchers have used CsPbBr 3 Fabricated solar cells, LEDs, single photon detectors, and CsPbBr 3 Quantum dot lasers. CbBr 3 It has great potential application value in the fields of optoelectronics and photovoltaics. [0003] CbBr 3 Extremely unstable in water environment, it will react with water quickly to form CsPb 2 Br 5 . Therefore, the conventional ...

Claims

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Application Information

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IPC IPC(8): C01G19/00
CPCC01G19/006C01P2002/84C01P2002/72
Inventor 苏兴华白鸽张静周杰包吉明王振军赵鹏
Owner CHANGAN UNIV
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