Method for improving humidity stability of perovskite material

A technology of perovskite material and stability, applied in the field of preparation of perovskite-based optoelectronic materials, can solve problems such as easy decomposition of perovskite, and achieve the effects of reducing surface defects, increasing carrier lifetime, and high controllability

Inactive Publication Date: 2018-10-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that perovskite is easy to decompose in the air, the present invention provides a method to improve the humidity stability of perovskite material, that is, to modify the surface of perovskite material through fluorocarbon hydrophobic chain molecules to obtain high efficiency and stable humidity Excellent perovskite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 461.01mg of lead iodide (PbI 2 ) and 158.97mg methylamine iodide (CH 3 NH 3 I), the PbI 2 Dissolve in 1 mL of N,N-dimethylformamide (DMF) and stir for 2h to obtain a solution of lead iodide in N,N-dimethylformamide, CH 3 NH 3 Dissolve in 20mL of isopropanol solution and stir for 2h to obtain the isopropanol solution of methylamine iodide, then slowly add the solution of lead iodide in N,N-dimethylformamide dropwise to methyl iodide under argon atmosphere In the isopropanol solution of amine, continue to stir for 20 minutes to obtain a light yellow suspension, and finally add 10 μL of 0.05 mol% perfluorooctylethylamine to the suspension, and stir for 30 minutes to obtain modified perovskite microwires, record It is 1#.

Embodiment 2

[0021] Weigh 461.01mg of lead iodide (PbI 2 ) and 158.97mg methylamine iodide (CH 3 NH 3 I), the PbI 2 Dissolve in 1 mL of N,N-dimethylformamide (DMF) and stir for 2h to obtain a solution of lead iodide in N,N-dimethylformamide, CH 3 NH 3 Dissolve in 20mL of isopropanol solution and stir for 2h to obtain the isopropanol solution of methylamine iodide, then slowly add the solution of lead iodide in N,N-dimethylformamide dropwise to methyl iodide under argon atmosphere In the isopropanol solution of amine, continue to stir for 20 minutes to obtain a light yellow suspension, and finally add 10 μL of 0.05 mol% perfluorooctylamine to the suspension, and stir for 30 minutes to obtain a modified perovskite micron wire, which is denoted as 2#.

Embodiment 3

[0023] Weigh 461.01mg of lead iodide (PbI 2 ) and 158.97mg methylamine iodide (CH 3 NH 3 1), then respectively weigh 800 μL of N,N-dimethylformamide (DMF) and 200 μL of dimethyl sulfoxide according to a volume ratio of 4:1 and mix to obtain a mixed solvent, then PbI 2 and CH 3 NH 3 I was added to the mixed solvent and stirred at 50° C. for 3 h to obtain a perovskite precursor solution; a chlorobenzene solution of perfluorooctylethylamine with a concentration of 0.2 mg / mL was prepared for use.

[0024] We further assembled photodetectors with the perovskite microwires prepared in Example 1 and Example 2, and carried out photoelectric performance tests. First, we spin-coated 1# suspension and 2# suspension at 2000rpm for 10 times to completely cover the glass substrate with perovskite micro-wires, then heated at 100°C for 30min, and evaporated 300nm Au under high vacuum. Electrode, get 1# photodetector and 2# photodetector.

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PUM

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Abstract

The invention discloses a method for improving the humidity stability of a perovskite material, that is to say fluorine-carbon hydrophobic chain molecules RNH2 are introduced to perform surface modification on the perovskite material to improve the humidity stability of the perovskite material. The method comprises the two steps of preparation of the perovskite material and mixed modification of the perovskite material and the fluorine-carbon hydrophobic chain molecules. According to the method provided by the invention provided by the invention, the hydrophobic chain molecules are used for modify the perovskite material, amino is combined with perovskite so that the perovskite material is reduced in surface defect and the service life of the carriers is prolonged, the hydrophobicity of the material surface can be improved by alkyl chains and C-F functional groups, finally both photoelectric property and humidity stability performance of the perovskite material can be significantly improved, and meanwhile, the service life of the perovskite-based photoelectric device is prolonged, so that the perovskite material has good development prospect in the actual application of the photoelectric field.

Description

technical field [0001] The invention relates to the technical field of preparation of perovskite-based photoelectric materials, in particular to a method for improving the humidity stability of perovskite materials. Background technique [0002] In recent years, CH 3 NH 3 PB 3 The representative organic-inorganic hybrid perovskite material has been developed rapidly and has become the most potential photovoltaic material. Compared with other semiconductor materials, perovskite materials have excellent photoelectric properties, such as high light absorption coefficient, long exciton diffusion length, bipolar carrier transport and other excellent properties, and the preparation process is simple. These advantages make calcium Titanium is not only an ideal solar cell material, but also widely used in other optoelectronic fields such as light-emitting diodes, lasers and photodetectors. [0003] Optoelectronic devices generally have two important technical indicators, includi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42C07C209/00C07C211/04C07C211/15B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C07C209/00H10K30/10C07C211/04C07C211/15Y02E10/549
Inventor 叶谦章琎郭鹏飞王洪强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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