Two-dimensional perovskite single-crystal material and preparation method thereof

A single crystal material and perovskite technology, which is applied in polycrystalline material growth, single crystal growth, single crystal growth, etc., can solve the problem of long period of two-dimensional perovskite, unfavorable formation of large-sized single crystal, and limited preparation efficiency and other problems, to achieve the effect of low environmental water and oxygen requirements, good application prospects, and simple preparation methods

Active Publication Date: 2018-09-21
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of high-quality, large-sized perovskite single crystals is crucial to the preparation of high-performance devices. Common bulk organic-inorganic halide perovskite (all-inorganic perovskite) single crystals can be prepared by inverse temperature growth method , the time required is several hours, while the preparation of two-dimensional perovskite single crystals is prepared by anti-solvent evaporation-assisted method, and the preparation of large-sized two-dimensional single crystal materials takes weeks or even months, and the preparation cycle is long. Not conducive to wide application
Zhai et al. prepared (C 4 h 9 NH 3 ) 2 PbBr 4 Two-dimensional perovskite, the two-dimensional perovskite obtained by this method has more crystal nuclei, the layered structure is not obvious, and the obtained crystal size is small; Yang et al. prepared several micron-sized (C 4 h 9 NH 3 ) 2 PbBr 4 Two-dimensional perovskite fl

Method used

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  • Two-dimensional perovskite single-crystal material and preparation method thereof
  • Two-dimensional perovskite single-crystal material and preparation method thereof
  • Two-dimensional perovskite single-crystal material and preparation method thereof

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Effect test

Embodiment 1

[0030] Lead bromide and propyl ammonium bromide (C 3 h 7 NH 3 Br) was added to the dimethylformamide solvent at a molar ratio of 1:2, and dissolved at room temperature to obtain a precursor solution with a solution concentration of 2M (mol / L); filter the precursor solution and put it into a clean 5mL In the sample bottle, add chlorobenzene solution (chlorobenzene: acetonitrile = 1:0) in another 100mL wide-mouth bottle as an anti-solvent for preparing single crystal; put the 5mL sample bottle containing the precursor solution into the wide-mouth Inside the jar, seal the jar and place it in a quiet place at room temperature. After about 4 weeks, white transparent crystals were separated out in the sample bottle, and the obtained crystals were dried at a dry temperature and stored in a drying cabinet. By using an anti-solvent (chlorobenzene), we found that the larger the concentration of the precursor, the smaller the crystal size (less than 500 μm), the time to obtain the cry...

Embodiment 2

[0032] Add lead bromide and propyl ammonium bromide into dimethylformamide solvent at a molar ratio of 1:2, and dissolve at room temperature to obtain a precursor solution with a concentration of 2M; filter the precursor solution and put In a clean 5mL sample bottle, add a mixed solution of chlorobenzene and acetonitrile (chlorobenzene:acetonitrile=1:0.1) in another 100mL wide-mouth bottle as an anti-solvent for preparing a single crystal; open the sample bottle containing the precursor solution Put the jar into the mouth, seal the jar, and place it in a quiet room temperature environment. After about 24 hours, white transparent crystals will be precipitated in the vial. Dry the obtained crystals at a dry temperature and store them in a drying cabinet. By adding a small volume of acetonitrile to the mixed anti-solvent, we found that the concentration of the precursor solution is relatively high, and the time to prepare the crystal is short, but there are more crystal nuclei, t...

Embodiment 3

[0034]Add lead bromide and propyl ammonium bromide into dimethylformamide solvent at a molar ratio of 1:2, and dissolve at room temperature to obtain a precursor solution with a concentration of 1.5M; filter the precursor solution and put into a clean 5mL sample bottle, and in another 100mL jar, add a mixed solution of chlorobenzene and acetonitrile (chlorobenzene:acetonitrile=1:0.1) as an anti-solvent for preparing a single crystal; the sample bottle containing the precursor solution Open the mouth and put it in the jar, seal the jar, and place it in a quiet room temperature environment. After about 48 hours, white transparent crystals will be precipitated in the sample bottle. Dry the obtained crystals at a dry temperature and store them in a drying cabinet for subsequent use. By adding a small amount of acetonitrile to the mixed anti-solvent, the time to prepare crystals is relatively short, the formation of crystal nuclei is relatively small, the crystal size is relatively...

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Abstract

The invention relates to a two-dimensional perovskite single-crystal and a preparation method thereof. The chemical composition of the two-dimensional perovskite single-crystal material is A2PbBr4, wherein A is C4H9NH3+ or C3H7NH3+. Lead bromide and ammonium bromide with the ratio being 1:2 are adopted as raw materials, dimethylformamide is adopted as a solvent, chlorobenzene or a mixture of chlorobenzene and acetonitrile are adopted as an anti-solvent, and due to the anti-solvent mixing evaporation method, the large-size two-dimensional perovskite single-crystal is prepared under the room temperature atmosphere environment. The method is low in environment condition requirement, simple in process, applicable to preparing large-size crystal. The two-dimensional perovskite single-crystal has the good application prospect in the photoelectric field, and the efficient and simple preparation method has the great potential for single-crystal commercialization application.

Description

technical field [0001] The invention relates to a two-dimensional perovskite single crystal and a preparation method thereof. The prepared two-dimensional single crystal has a larger crystal size. Background technique [0002] Perovskite materials have many excellent properties and are widely concerned by researchers. Perovskite solar cells are developing rapidly, and the efficiency has increased from 3.9% to more than 22%. It also has good applications in light-emitting diodes. The luminescent external quantum efficiency exceeds 14%, and it is also widely used in detectors, lasers and other fields. Perovskite single crystal, with longer diffusion length, longer lifetime has good applications, such as perovskite single crystal battery, its efficiency exceeds 18%, perovskite single crystal detector, which has a wide range of detection performance, detection of X-rays, gamma rays, visible light, etc. [0003] In recent years, the synthesis methods of perovskite single crysta...

Claims

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Application Information

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IPC IPC(8): C30B29/54C30B29/64C30B7/14C30B7/06
CPCC30B7/06C30B7/14C30B29/54C30B29/64
Inventor 方国家姚方
Owner WUHAN UNIV
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