A method for preparing large-sized grain perovskite thin films by scraping method

A perovskite, large-scale technology, which is applied in the field of preparing large-scale grain perovskite thin films by the blade coating method, can solve the problems of slowness, high toxicity, high consumption, etc., and achieves simple equipment structure, low equipment cost, and simplicity. The effect of preparation

Active Publication Date: 2022-02-08
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

[0008] 1) In order to grow perovskite grains with preferential tendency at low temperature, the process of meniscus-assisted solvent printing to prepare perovskite films requires extremely slow movement of the substrate, usually at a rate of 10-20 μm / s, which will reduce Fabrication speed of perovskite devices
[0009] 2) The gas-solid interface reaction of the vapor-assisted deposition method is very limited, and usually requires a higher temperature (≥200°C) or prolonged reaction time (several hours) to obtain a dense perovskite film, and the perovskite film prepared by this method Ore grain size still needs to be improved
[0010] 3) The traditional organic solvents used to prepare perovskite precursors are highly toxic, cannot be environmentally friendly, and consume a large amount, which is easy to cause damage to the air environment and human health

Method used

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  • A method for preparing large-sized grain perovskite thin films by scraping method
  • A method for preparing large-sized grain perovskite thin films by scraping method
  • A method for preparing large-sized grain perovskite thin films by scraping method

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preparation example Construction

[0043] Preparation of Ionic Liquid Perovskite Scratch Coating Precursor:

[0044] like figure 1 As shown, the inorganic halide (YX 2 ) and organic halides (MAI or MAI and FAI) were added to the protic ionic liquid at a molar ratio of 1:1. Ionic liquids are used as solvents for perovskite precursors. In an inert gas atmosphere, heat at 55° C. and stir for 6-9 hours, and then transfer the perovskite precursor solution to the air environment for scraping to prepare a perovskite film. The active ingredient of the protic ionic liquid is one or several mixtures of MAAc (methylamine acetate), MAP (methylamine propionate) and MABa (methylamine butyrate).

[0045] Preparation of perovskite thin films by doctor blade method:

[0046] First, the FTO (fluorine-doped tin dioxide)-coated glass substrate was cleaned with lye, active detergent, deionized water, and ethanol. The FTO-coated glass was ultrasonically cleaned sequentially in lye, active detergent, deionized water, and ethano...

Embodiment 1

[0051] This embodiment provides a method for preparing a perovskite film by blade coating, the specific steps are as follows:

[0052] Step 1: MAI (methylamine hydroiodide) and PbI with a molar ratio of 1:1 2 (lead iodide) mixed with 1mL ionic liquid MAAc, MAI and PbI 2 The masses were 102 mg and 298 mg respectively, and they were stirred for 9 hours under heating at 55° C. before use.

[0053] Step 2: Spin c-TiO 2 The substrate was preheated at 100°C for 5 minutes, and the distance between the coating scraper and the substrate was adjusted to 0.1 mm, and then 10 μL of the perovskite precursor solution was transferred to the slit between the scraper and the substrate with a pipette gun. .

[0054] Step 3: Drag the scraper at a speed of 30mm / s to obtain a wet perovskite film, and the wet film will gradually turn black and undergo a phase transition. After scrape coating, anneal for 20 seconds on a scraper coater, and then transfer the phase-transformed perovskite film to a ...

Embodiment 2

[0057] This embodiment provides a method for preparing a perovskite film by blade coating, the specific steps are as follows:

[0058] Step 1: MAI, FAI and PbI with a molar ratio of 0.5:0.5:1 2 Mix with 1 mL of ionic liquid MAAc, MAI, FAI and PbI 2 The masses are 50.8mg, 54.9mg, and 294.3mg respectively, and they are heated at 55°C and stirred for 9 hours before use.

[0059] Step 2: Spin c-TiO 2 The substrate was preheated at 100°C for 5 minutes, and the distance between the coating scraper and the substrate was adjusted to 0.1 mm, and then 10 μL of the perovskite precursor solution was transferred to the slit between the scraper and the substrate with a pipette gun. .

[0060] Step 3: Drag the scraper at a speed of 30mm / s to obtain a wet perovskite film, and the wet film will gradually turn black and undergo a phase transition. After the blade coating, anneal on the blade coater for 20 seconds, then transfer the phase-transformed perovskite film to a hot stage at 110°C a...

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Abstract

The invention relates to a method for preparing a perovskite thin film with large grains by a scraping method. Firstly, an ionic liquid perovskite scraper coating precursor is prepared. The next layer of wet perovskite film; anneal for 20±5 seconds on a knife coater, then transfer the fully transformed perovskite film to a hot stage at 110±10°C and anneal for another 10 minutes to obtain sufficient deposition perovskite thin films with large grain size. Beneficial effects: the preparation of perovskite thin films with large-sized grains is carried out in the air, without special protective atmosphere requirements; the parameters of perovskite thin films can be adjusted according to actual needs by adjusting the scraping rate, gap spacing, etc.; scraping coating machine The structure of the equipment is simple, easy to operate, and the cost of the equipment is low, which is suitable for large-scale production; the perovskite film with large grain size can be used not only in solar cells, but also in other fields such as light-emitting diodes and photodetectors.

Description

technical field [0001] The invention belongs to a method for preparing a perovskite thin film, and relates to a method for preparing a large-sized grain perovskite thin film by a scraping method. Background technique [0002] With the rapid development of society and the rapid increase of population, the demand for green energy without pollution to the environment has become increasingly prominent. Making full use of solar energy will solve major problems such as energy crisis and environmental pollution faced by human beings. As a new generation of solar cells, titanium ore solar cells have the advantages of low cost, suitable bandgap width, long carrier life, and long diffusion distance. They are high-efficiency metal halide semiconductor materials. The photoelectric conversion efficiency of mineral solar cells has exceeded 25%, which is close to the highest efficiency record of monocrystalline silicon cells. At present, the preparation method of high-efficiency perovskit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/48H01L51/46H01L51/42H01L51/56H01L51/54H01L51/50
CPCH10K71/12H10K85/30H10K30/00H10K50/00Y02E10/549Y02P70/50
Inventor 陈永华陈畅顺黄维宋霖冉晨鑫
Owner NORTHWESTERN POLYTECHNICAL UNIV
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