Method for preparing nanometer perovskite material on water base and product thereof

A nano-material and perovskite technology, which is applied in the field of water-based preparation of perovskite nano-materials, can solve the problems of unsuitable micro-nano devices, low electron transmission efficiency, unfriendly environment, etc., and achieve good stability and photoelectric performance, The effect of reducing health risks and reducing production costs

Active Publication Date: 2017-06-13
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

However, the above method has the following defects: 1. The solvent is toxic and unfriendly to the environment. For example, N,N-dimethylformamide diethyl acetal is harmful to human skin; 2. The synthesized perovskite nanomaterials are mostly Root nanomaterials (such as Gao Li, etc., Nano Lett.November 1, 2016), which have the disadvantages of high noise, low responsivity, and high energy consumption; 3. The generated perovskite nanomaterials cannot adjust the band gap, so they cannot change The band that the material absorbs
[0004] Although perovskite films with adjustable bandgap can be obtained in the prior art (such as Nano Energy (2014) 7,80–85), due to their thin film form, the electron transport efficiency is low and they are not suitable for micro-nano devices

Method used

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  • Method for preparing nanometer perovskite material on water base and product thereof
  • Method for preparing nanometer perovskite material on water base and product thereof
  • Method for preparing nanometer perovskite material on water base and product thereof

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preparation example Construction

[0034] The preparation method of above-mentioned perovskite nano-material comprises the following steps:

[0035] S1. Add the solid reactants to the supersaturated lead halide aqueous solution, and at the same time shake for 2s~10s until A is fully generated x B (1－x) BYZGR 3 Floc; wherein, the solid reactant includes AY and BY with a molar ratio of x:(1-x);

[0036] Usually, both AY and BY use powdery reaction raw materials in order to mix them into solid reactants with uniform composition, so as to ensure that when added to supersaturated lead halide aqueous solution, the generated products also have uniform chemical composition; AY and BY are mixed with lead halide. The halide ions can be the same or different;

[0037] S2. Drop-coat the floc on the substrate, and heat it at 75°C to 120°C for 2min to 15min to fully dry it to obtain the molecular formula A x B (1－x) BYZGR 3 perovskite nanomaterials.

[0038] In said step S1, the preparation method of the supersaturate...

Embodiment 1

[0043] The preparation method of embodiment 1 is as figure 1 shown, including the following steps:

[0044] S1. Put 1g of lead halide powder in a 25mL glass bottle, add 20mL of deionized water, the lead halide powder is not completely dissolved; the lead halide in this embodiment is lead iodide;

[0045]S2. Tighten the cap of the glass bottle in the first step, place the tightened glass bottle in a water bath for heating, when the temperature of the water bath reaches 100°C, start timing, keep the temperature of the water bath at 100°C for 10 minutes, and after 10 minutes, make the water bath The temperature is naturally lowered; and when the temperature of the water bath in S2 drops to 75°C, start timing to keep the temperature of the water bath at 75°C for 30 minutes. After 30 minutes, unscrew the bottle cap and draw 15 ml of the supernatant to transfer the saturated lead iodide solution In the glass bottle of new 25 milliliters, the concentration of this saturated lead iod...

Embodiment 16

[0053] Repeat Example 1 with the same steps described above, the difference is that in the step S2, place the tightened glass bottle in a water bath for heating, and when the temperature of the water bath reaches 100°C, start timing to make the water bath temperature of 100°C Keep it for 15 minutes, then unscrew the bottle cap, draw 15 milliliters of the supernatant, that is, the saturated lead iodide solution, and transfer it to a new 25 milliliter glass bottle;

[0054] In the step S3, the saturated lead iodide solution is cooled to 30° C. to obtain a supersaturated lead iodide solution with a concentration of 0.03 mol / L;

[0055] In said step S4, oscillate for 2s;

[0056] In the step S5, heat at 75° C. for 15 minutes.

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Abstract

The invention discloses a method for preparing a nanometer perovskite material on water base and a product thereof. The molecular formula of the nanometer perovskite material is AxB(1-x)PbY3; x is more than or equal to 0 but less than or equal to 1; A and B are monovalent cations; Y is halide ion. According to the invention, water is used for replacing the traditional organic polar solvent, such as, N,N-dimethyl formamide acetal, and is used as a lead halide solvent for preparing the nanometer perovskite material; the ratio of AY to BY in the generated nanometer perovskite material can continuously change within the scope of (0:1)-(1:0); the fluorescence peak position and the band gap size of the generated halogen nanometer perovskite material can be effectively adjusted, so that a visible-light response material with a response waveband from 300nm to 764nm can be acquired; nontoxic water is used as a compound solution; the health risk of the production personnel can be reduced; the environmental pollution can be relieved; the production cost of the nanometer perovskite material can be lowered.

Description

technical field [0001] The invention belongs to the fields of photovoltaic, photodetection and light-emitting diode materials, and more specifically relates to a water-based method for preparing perovskite nanomaterials and products thereof. Background technique [0002] In recent years, organic-inorganic hybrid perovskites have been widely used in the field of optoelectronics, such as the preparation of solar cells, LED lights, field effect tubes, photodetectors, lasers and other devices. Generally speaking, for the optoelectronic devices mentioned above, the absorption band edge and fluorescence peak position of perovskite materials determine the functional scope of optoelectronic devices. [0003] In the prior art, the synthesis and self-assembly of perovskite nanomaterials is achieved by evaporating solvents. The specific methods include: spin coating, drop coating, doctor blade coating, laser etching, roll-to-roll, etc. The above method for obtaining perovskite nanomat...

Claims

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Application Information

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IPC IPC(8): C09K11/66C09K11/06H01L33/50H01L31/055B82Y30/00
CPCB82Y30/00C09K11/06C09K11/665C09K2211/188H01L31/055H01L33/502Y02E10/52
Inventor 宋海胜董东冬邓辉胡超
Owner HUAZHONG UNIV OF SCI & TECH
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