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Preparation method and application of large size and continuously adjustable cesium content perovskite single crystal

A perovskite, large-scale technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of continuous change of Cs content and high difficulty of perovskite single crystal, and achieve high carrier Mobility, excellent high humidity stability, and the effect of easy growth conditions

Active Publication Date: 2022-03-22
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the problem of growing high Cs content (>7%) in the prior art (FA 1-x-y MA x Cs y )Pb(I 1-z Br z ) 3 The difficulty of perovskite single crystal is high, and the continuous change of Cs content is difficult. The present invention proposes a preparation method and application of large-size perovskite single crystal with continuously adjustable cesium content.

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  • Preparation method and application of large size and continuously adjustable cesium content perovskite single crystal
  • Preparation method and application of large size and continuously adjustable cesium content perovskite single crystal
  • Preparation method and application of large size and continuously adjustable cesium content perovskite single crystal

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[0033] In the first aspect of the present invention, there is provided a method for preparing a perovskite single crystal with large size and continuously adjustable cesium content, including: using the characteristics of inverse temperature solubility of the perovskite single crystal of ternary cations and binary anions in solvents A single crystal is precipitated in; the ternary cation and binary anion perovskite single crystal is (FA 1-x-y MA x Cs y )Pb(I 1-z Br z ) 3 ; x is the doping amount of MA, selected from any value in 0-1, y is the doping content of Cs, selected from any value in 0-1, z is the doping content of Br, selected from 0-1 any value.

[0034] In one or more embodiments of the present invention, the inverse temperature solubility refers to the growth mode of crystals obtained by dissolving multi-component raw materials at low temperature and then slowly rising to high temperature;

[0035] The low temperature refers to 40-60°C, further 60°C;

[0036]...

Embodiment 1

[0064] Mix and dissolve formamidine iodide, methylamine bromide, cesium bromide, lead iodide, and lead bromide in a molar ratio of 18:1:1:18:2 in GBL to obtain a concentration of 1mol / L mixed solution. After the solution is fully stirred at 60°C, continue to drop hypophosphorous acid or hydroiodic acid and other solutions to obtain a mixed precursor solution. After sealing the solution, transfer it to a growth tank, and heat up to 90°C to start growth. Crystals, through spontaneous crystallization, finally obtain large size (FA 0.9 MA 0.05 Cs 0.05 )Pb(I 0.9 Br 0.1 ) 3 Perovskite single crystal, the size is about 5mm, the ultraviolet absorption edge is located at 842nm, and the optical band gap is 1.51eV. The actual ratio of FA:MA detected by nuclear magnetic resonance is about 1:0.5. According to the ICP test, the Cs content is about 1.33747%, and the Pb content is about 36.2142%. The converted FA:MA:Cs ratio is about 0.89:0.045:0.058.

Embodiment 2

[0066] Lead formamidine iodide, lead cesium bromide, methylamine bromide, and lead bromide are mixed and dissolved in GBL at a molar ratio of 17:2:1:1 to obtain a mixed solution with a concentration of 1 mol / L. According to the method of embodiment 1, grow single crystal, finally obtain cesium content and be 10% large size (FA 0.85 MA 0.05 Cs 0.1 )Pb(I 0.85 Br 0.15 ) 3 Perovskite single crystal.

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Abstract

The invention relates to the field of preparation and crystal growth of an organic-inorganic hybrid mixed halogen perovskite material, in particular to a preparation method and application of a perovskite single crystal with large size and continuously adjustable cesium content. Including: using the characteristics of the inverse temperature solubility of ternary cations and binary anion perovskite single crystals to precipitate single crystals in solvents; the ternary cations and binary anion perovskite single crystals are (FA 1‑x‑y MA x Cs y )Pb(I 1‑z Br z ) 3 . The perovskite single crystal obtained by using this method can effectively control the Cs content in the single crystal; and based on different Cs doping content, the crystal stability can be improved, and the finally obtained single crystal is a single crystal with a large size of 4 mm. The grown large-size perovskite single crystal has excellent stability and excellent optoelectronic performance.

Description

technical field [0001] The invention relates to the field of preparation and crystal growth of organic-inorganic hybrid mixed halogen perovskite materials, in particular to a preparation method and application of a perovskite single crystal with large size and continuously adjustable cesium content, and more specifically to a method for growing cesium Continuously adjustable content, ultra-high moisture stability, ternary mixed cations and mixed anions (FA 1-x-y MA x Cs y )Pb(I 1-z Br z ) 3 Preparation method and application of perovskite single crystal. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Organic-inorganic hybrid perovskite has the advantages of direct ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/14C30B29/12H01L51/42
CPCC30B7/14C30B29/12H10K30/10Y02E10/549
Inventor 丁建旭王开宇张杰姚青孙海清张伟伟
Owner SHANDONG UNIV OF SCI & TECH
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