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Two-dimensional layered perovskite layer and preparation method thereof

A two-dimensional layered, perovskite technology, applied in organic chemistry methods, amino compound preparation, chemical instruments and methods, etc., can solve problems such as toxicity and complex preparation process, and achieve the effect of improving intrinsic stability

Active Publication Date: 2019-10-08
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solutions used in these traditional solution methods are generally toxic, and the preparation process is relatively complicated.

Method used

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  • Two-dimensional layered perovskite layer and preparation method thereof
  • Two-dimensional layered perovskite layer and preparation method thereof
  • Two-dimensional layered perovskite layer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Put 403㎎ of butylamine hydroiodide and 461㎎ of lead iodide powder in a mortar, grind them thoroughly to get a mixed powder, transfer the mixed powder to a polytetrafluoroethylene liner, and seal it tight;

[0033] (2) Put the sealed polytetrafluoroethylene liner into the reaction kettle, seal and lock the reaction kettle, put it into the oven, adjust the reaction temperature of the oven to 180 degrees Celsius for 24 hours, and obtain black crystals.

[0034] SEM was carried out on the obtained black crystals as Figure 5 shown. Figure 5 Middle a is the SEM image of the concentrated position of the obtained crystal powder, and more two-dimensional perovskites with a sheet-like structure can be seen. Figure 4 b-d are SEM images of the dispersed area, and it can be clearly observed that the surface of the obtained n=1 two-dimensional layered perovskite single crystal is uniform and smooth.

Embodiment 2

[0036] (1) Put 201.5㎎ of butylamine hydroiodide, 461㎎ of lead iodide powder and 79.5㎎ of methyl ammonium iodide in a mortar, grind them thoroughly to obtain a mixed powder, and transfer the mixed powder to poly In the tetrafluoroethylene liner, sealed and locked;

[0037] (2) Put the sealed polytetrafluoroethylene liner into the reaction kettle, seal and lock the reaction kettle, put it into the oven, adjust the reaction temperature of the oven to 180 degrees Celsius for 24 hours, and obtain black crystals.

[0038] Carry out SEM analysis to the obtained black crystal, as Figure 6 as shown, Figure 6 Middle a–d are SEM images of dispersed n=2 2D layered perovskites. It can be found that the surface of the obtained single crystal is flat and relatively regular. compared to Figure 5 The obtained n=1 single crystal has a relatively thicker thickness shown by n=2. Figure 6 The lateral SEM layering shown in middle d is more obvious.

[0039] Its ultraviolet-visible absorptio...

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Abstract

The invention relates to a two-dimensional layered perovskite layer and a preparation method thereof. The preparation method mainly comprises the following steps: uniformly mixing a certain amount ofbutylamine hydroiodate or butylamine hydroiodate and methyl ammonium iodide with a certain amount of lead iodide so as to obtain mixed powder; transferring the mixed powder into a polytetrafluoroethylene liner, and performing sealing; putting the sealed polytetrafluoroethylene liner into a reaction kettle, and performing heating for 24-48 hours at 160-200 DEG C, so as to obtain the two-dimensionallayered perovskite crystal (BA)2(CH3NH3)n-1PbnI3n+1, wherein n is a positive integer. By adopting the method, a toxic solution is not adopted for the reaction, so that the method is green and environment-friendly. In addition, the two-dimensional layered perovskite crystal prepared by using the method is good in stability.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a two-dimensional layered perovskite crystal and a preparation method thereof. Background technique [0002] Organic-inorganic hybrid three-dimensional perovskite materials have the advantages of high light absorption coefficient, high carrier mobility, long carrier diffusion length, adjustable band gap, etc., making them widely used in solar cells, light-emitting diodes and other fields. focus on. At present, in the field of solar cells, the photoelectric conversion efficiency of devices prepared with the three-dimensional perovskite layer as the light-absorbing layer is 24.2%. [0003] Although the photoelectric conversion efficiency of perovskite solar cells has improved rapidly, the stability has always been an important obstacle to its industrialization. The stability of perovskite solar cells includes the intrinsic stability of the material and the influence of the tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/00C07C211/04C07C211/03
CPCC07C209/00C07B2200/13C07C211/04C07C211/03
Inventor 刘彭义林东旭庞娜娜刘小畅王云庆陈科时婷婷周洋谢伟广
Owner JINAN UNIVERSITY
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