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A kind of bismuth-based halide perovskite nanosheet and preparation method thereof

A perovskite and nanosheet technology, applied in the field of perovskite nanosheets and its preparation, can solve the problems of poor film flatness, limited application, and many defects

Inactive Publication Date: 2021-05-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bismuth-based perovskite materials currently prepared by the conventional low-temperature liquid phase method are all hexagonal crystal blocks with a particle size of several microns and a thickness of several hundred nanometers.
Films prepared with such large-sized nanoparticles will have problems such as poor planarity and many defects, which limit their application in optoelectronic devices

Method used

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  • A kind of bismuth-based halide perovskite nanosheet and preparation method thereof
  • A kind of bismuth-based halide perovskite nanosheet and preparation method thereof
  • A kind of bismuth-based halide perovskite nanosheet and preparation method thereof

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preparation example Construction

[0027]The method of preparing a two-dimensional perovskite nano film according to the present invention includes the following steps:

[0028]1) Clean the surface cleansing bottom electrode to drop the preparative prepared perovanium ore before the rotary coating film A3BI2I9; Then annealing;

[0029]2) Use a polar solvent treatment while annealing, dissolve-recrystallization; that is, the two-dimensional perovskite nano film is obtained, wherein A = CH3NH3+CS+.

[0030]The single layer thickness of the two-dimensional calcium titanium nano-membrane can minimize 2.0 ± 0.2 nm.

Embodiment 1

[0032]1) Start with washing sperm (about 1 mm) for 20 minutes to remove organic and inorganic stains that may be present on the surface; then rinse with a large amount of tap water; finally put the glass sheet in deionized water Ultrasound Wash 20 minutes; put the above-mentioned glass sheets in anhydrous ethanol for about 20 minutes to remove surface residual organic impurities, and this step repeats more times; then the glass sheet is ultrasonic in acetone for about 20 minutes. Further removal of the surface residual organic impurities; remove the glass sheet substrate from the acetone, placed in an ultraviolet ozone cleaning machine, washed for 30 minutes.

[0033]2) Simultaneously dissolve MAI and BII 3 simultaneously dissolved in the DMF solution at the ratio of 3: 2, stirring at 70 degrees for 12 hours, thereby formulating 1M MA3BI2I9Pre-proliferation of perovskite;

[0034]3) Place the washed glass sheet on the spin coater, adding 200 μm perovskite precursor solution to spin coatin...

Embodiment 2

[0038]1) Cleaning with detergent, deionized water, anhydrous ethanol, acetone, and ultraviolet ozone cleaning using detergent, deionized water, anhydrous ethanol, acetone.

[0039]2) Simultaneously dissolve CSI and BII 3 simultaneously dissolved in DMF solution at 3: 2, stirred at 70 degrees for 12 hours, thereby configuring 1 M CS3BI2I9Pre-proliferation of perovskite;

[0040]3) Place the washed glass sheet on the spin coater, adding 200 μm perovskite precursor solution to spin coating at 1000 rpm under 1 min after 1000 rpm;

[0041]4) The volume ratio of methanol and DMF is 10: 1 to 50: 1, and the spin-coated glass substrate is placed in the container, and 5 uL ~ 100 ul is added dropwise on the substrate on the substrate. Sex solution, or 50 ul to 200 ul of mixed polar solution, adding the solution vapor to the substrate, so that the perovskite film is immersed in a steam atmosphere of the mixed solution, and after it is dissolved - rejected the crystal, put it Annealing is performed on a ...

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Abstract

The invention discloses a bismuth-based halide perovskite nanosheet and a preparation method thereof. The perovskite precursor liquid A 3 Bi 2 I 9 Coating on a substrate with a clean surface by spin coating method; annealing the substrate at 100-110°C in a polar solvent atmosphere; and preparing the two-dimensional perovskite on the substrate after annealing for a period of time Nanosheets. In the present invention, the post-treatment-dissolution-recrystallization of the film is realized by using a polar solvent, and the prepared two-dimensional perovskite nanosheets are not only uniform in shape and size, but also more efficient than the lead-based perovskite reported so far. The method of nanosheets is more convenient and feasible, and the thickness of the prepared single-layer or few-layer two-dimensional perovskite nanosheets reaches a minimum of 2.0±0.2nm, so as to make better use of the inherent space confinement effect of two-dimensional materials and lead to its It has a longer lifetime of photogenerated carriers, so it has better photoelectric response performance.

Description

Technical field[0001]The present invention belongs to the technical field of photovoltaic membrane, and is related to a perovskite nanofer and a preparation method thereof.Background technique[0002]Organic-inorganic lead-proof calcium titanium ore material (structural formula is ABX3Because of the characteristics of the adjustable band gap, the carrier diffusion distance is large, magnetic, and dielectric polarization, and is widely used in solar cells, light emitting diodes, photodetectors, and lasers. Device application. In addition, another significant feature is that such perovskite materials can prepare nanoparticles having high crystallinity by simple liquid phase method at 150 degrees. However, since this lead-based perceitanium ore material contains a highly toxic metal element lead and its stability thereof in air (fast degradation of the structure in contact with the water molecules), it limits its further industrial application.[0003]In order to solve this problem, there ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/22C03C17/28C03C17/34C03C17/42
CPCC03C17/22C03C17/28C03C17/3447C03C17/42
Inventor 胡延强张树芳苗晓亮邱婷白帆张陈明
Owner NANJING UNIV OF SCI & TECH
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