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Method for preparing pure inorganic perovskite film under assistance of polyethylene glycol

A technology of polyethylene glycol and inorganic calcium, applied in chemical instruments and methods, luminescent materials, coatings, etc., can solve the problems of uneven distribution of film components, high probability of non-radiative transition, and short exciton radiation lifetime. Good compactness, short heat treatment time, and excellent luminous efficiency

Active Publication Date: 2017-11-07
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current methods of preparing pure inorganic perovskite films are mainly one-step and two-step methods. The two-step method has uneven composition distribution, high heat treatment temperature, and complicated process; while the one-step method has poor film-forming properties and many defects. , so that the probability of non-radiative transition is high, the exciton radiation lifetime is short, and the quantum yield is low

Method used

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  • Method for preparing pure inorganic perovskite film under assistance of polyethylene glycol
  • Method for preparing pure inorganic perovskite film under assistance of polyethylene glycol
  • Method for preparing pure inorganic perovskite film under assistance of polyethylene glycol

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Embodiment 1

[0031] Present embodiment relates to a kind of method that polyethylene glycol, lead bromide and cesium bromide are dissolved in dimethyl sulfoxide DMSO and one step is spin-coated on the perovskite thin film that obtains on glass slide substrate, and described method comprises The following steps:

[0032] Dissolve 0.0630g of lead bromide and 0.0384g of cesium bromide in 0.5ml of DMSO to obtain 15.57wt% pure inorganic CsPbBr 3 Precursor solution A;

[0033] Weigh 0.04g polyethylene glycol (average molecular weight 2w) and dissolve it in 2ml DMSO to obtain 20mg / ml PEG solution B;

[0034] Take 150ul precursor solution A, then pipette 265ul polyethylene glycol solution B, and mix to obtain solution C. At this time, CsPbBr in solution C 3 The concentration is 6.25wt%, the PEG concentration is 1.15wt%, and stirred at room temperature for 4h;

[0035] Spin-coat solution C evenly on a glass slide at 3000rpm for 60s, and dry at 70°C for 5min to obtain a pure inorganic perovskite ...

Embodiment 2

[0040] Present embodiment relates to a kind of method that polyethylene glycol, lead bromide and cesium bromide are dissolved in dimethyl sulfoxide DMSO and one step is spin-coated on the perovskite thin film that obtains on glass slide substrate, and described method comprises The following steps:

[0041] Dissolve 0.0630g of lead bromide and 0.0384g of cesium bromide in 0.5ml of DMSO to obtain pure inorganic CsPbBr 3 Precursor solution A, the solution concentration is 15.57wt%;

[0042] Weigh 0.02g polyethylene glycol (average molecular weight 2w) and dissolve it in 2ml DMSO to obtain 10mg / ml PEG solution B;

[0043] Take 150ul precursor solution A, then pipette 265ul polyethylene glycol solution B, and mix to obtain solution C. At this time, CsPbBr in solution C 3 The concentration is 6.25wt%, the PEG concentration is 0.58wt%, and stirred at room temperature for 4h;

[0044]Spin-coat solution C evenly on a glass slide at 3000rpm for 60s, and dry at 70°C for 5min to obtai...

Embodiment 3

[0047] Present embodiment relates to a kind of method that polyethylene glycol, lead bromide and cesium bromide are dissolved in dimethyl sulfoxide DMSO and one step is spin-coated on the perovskite thin film that obtains on glass slide substrate, and described method comprises The following steps:

[0048] Dissolve 0.0630g of lead bromide and 0.0384g of cesium bromide in 0.5ml of DMSO to obtain pure inorganic CsPbBr 3 Precursor solution A, the solution concentration is 15.57wt%;

[0049] Weigh 0.05g polyethylene glycol (average molecular weight 2w) and dissolve it in 2ml DMSO to obtain 25mg / ml PEG solution B;

[0050] Take 150ul precursor solution A, then pipette 265ul polyethylene glycol solution B, and mix to obtain solution C. At this time, CsPbBr in solution C 3 The concentration is 6.25wt%, the PEG concentration is 1.43wt%, and stirred at room temperature for 4h;

[0051] The obtained solution C was evenly covered on the glass slide by spin coating at 3000rpm for 60s,...

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Abstract

The invention discloses a method for preparing a pure inorganic perovskite film under assistance of polyethylene glycol. The method comprises steps as follows: a polyethylene glycol solution is mixed with a solution containing lead bromide and cesium bromide and stirred at room temperature, a mixed liquid is obtained, then the mixed liquid is subjected to spin coating and thermal treatment sequentially, and the pure inorganic perovskite film is obtained; alternatively, lead bromide and cesium bromide are directly dissolved in the polyethylene glycol solution serving as a solvent and stirred at room temperature, and a mixed liquid is obtained; the mixed liquid is subjected to spin coating and thermal treatment sequentially, and the pure inorganic perovskite film is obtained. The preparation process is simple, the product can be obtained only through one-step spin coating and thermal treatment, industrial production is facilitated, the prepared pure inorganic perovskite film has a compact and flat surface, has the quantum efficiency nearly 3 times that of a film without polyethylene glycol and can be widely applied to solar cells, laser and LEDs.

Description

technical field [0001] The invention relates to the preparation technology of pure inorganic perovskite materials, in particular to a method for preparing pure inorganic perovskite thin films assisted by polyethylene glycol. Background technique [0002] Since 2009, organic-inorganic hybrid perovskite materials (mainly MAPbBr 3 ) has attracted much attention. In just a few years, its photoelectric conversion efficiency has increased from the initial 3% to the current 22.1%. At present, the preparation of hybrid perovskite thin films is mainly obtained by solution method and one-step spin coating method, and has been widely used in solar cells, LEDs, lasers, etc. However, due to the easy decomposition of MAX raw materials, the high sensitivity of the material to air and humidity, and poor thermal stability, its application is greatly restricted. Therefore, it is of great significance to prepare stable perovskite materials. The pure inorganic perovskite material has high th...

Claims

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Application Information

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IPC IPC(8): C03C17/22C09K11/02C09K11/66
CPCC03C17/006C03C17/22C03C2217/284C03C2217/42C03C2218/116C09K11/025C09K11/665
Inventor 孙洪涛周阳雍自俊陈雅蒙马桔萍
Owner SUZHOU UNIV
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