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Lead-free tin-based halide perovskite thin film, preparation method and application thereof

A halide perovskite, lead-free tin-based technology, applied in the field of solar cells, can solve the problems of reducing device efficiency and stability, increasing the complexity and cost of the preparation process, poor stability of tin-based perovskite, etc. Effects of stability, good light absorption properties

Active Publication Date: 2020-03-06
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since divalent tin is easily oxidized in the air, the stability of the tin-based perovskite itself is relatively poor, which reduces the efficiency and stability of the device.
Although the method of improving the stability of traditional solar cells can also be used to prepare tin-based perovskite solar cells with better stability, it may increase the complexity and cost of the current preparation process.

Method used

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  • Lead-free tin-based halide perovskite thin film, preparation method and application thereof
  • Lead-free tin-based halide perovskite thin film, preparation method and application thereof
  • Lead-free tin-based halide perovskite thin film, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] x=0.02, FA 0.98 DPPA 0.02 SnI 3 Preparation method of perovskite thin film:

[0039] Weigh out 372mg of stannous iodide, 168mg of formamidine hydroiodide, 6.8mg of 3,3-diphenylpropylamine hydroiodide (DPPAI), and 16mg of stannous fluoride and mixed and dissolved in 800 μL DMF and 200 μL DMSO In the mixed polar solvent, stirring for more than 6h, until the solution is uniform and clear, to obtain FA 0.98 DPPA 0.02 SnI 3Perovskite precursor solution. The resulting solution was filtered through a 0.22 μm pore size polytetrafluoroethylene syringe filter for spin coating. Take 50 μL of the precursor solution and drop it on the PEDOT:PSS substrate, adjust the rotation speed to 4000 rpm and the time for 60 s. In the first 15s of spin coating, use a pipette to pipet 200 μL of chlorobenzene and drop it onto the spinning substrate. After spin coating, annealed at 100 °C for 10 min to obtain dark brown FA 0.98 DPPA 0.02 SnI 3 Perovskite thin films. figure 1 (b), FA 0....

Embodiment 2

[0041] x=1, DPPA 2 SnI 4 Preparation method of film:

[0042] Weigh 372 mg of stannous iodide, 678 mg of 3,3-diphenylpropylamine hydroiodide (DPPAI), and 16 mg of stannous fluoride and mix and dissolve them in a mixed polar solvent of 800 μL DMF and 200 μL DMSO, and stir for more than 6 hours. until the solution is homogeneous and clear to obtain DPPA 2 SnI 4 precursor solution. The resulting solution was filtered through a 0.22 μm pore size polytetrafluoroethylene syringe filter for spin coating. Take 50 μL of the precursor solution and drop it on the PEDOT:PSS substrate, adjust the rotation speed to 4000 rpm and the time for 60 s. In the first 15s of spin coating, use a pipette to pipet 200 μL of chlorobenzene and drop it onto the spinning substrate. After spin coating, annealed at 100 °C for 10 min to obtain yellow DPPA 2 SnI 4 film. figure 1 (c) for DPPA 2 SnI 4 The XRD pattern of the thin film shows that it no longer has the characteristic diffraction peaks of ...

Embodiment 3

[0044] When R=Br, FA 0.98 DPPA 0.02 SnI 2.98 Br 0.02 Preparation method of perovskite thin film:

[0045] Weigh out 372mg of stannous iodide, 168mg of formamidine hydroiodide, 5.8mg of 3,3-diphenylpropylamine hydrobromide (DPPABr), and 16mg of stannous fluoride and mixed and dissolved in 800μL DMF and 200μL DMSO In the mixed polar solvent, stirring for more than 6h, until the solution is uniform and clear, to obtain FA 0.98 DPPA 0.02 SnI 2.98 Br 0.02 Perovskite precursor solution. The resulting solution was filtered through a 0.22 μm pore size polytetrafluoroethylene syringe filter for spin coating. Take 50 μL of the precursor solution and drop it on the PEDOT:PSS substrate, adjust the rotation speed to 4000 rpm and the time for 60 s. In the first 15s of spin coating, use a pipette to pipet 200 μL of chlorobenzene and drop it onto the spinning substrate. After spin coating, annealed at 100 °C for 10 min to obtain dark brown FA 0.98 DPPA 0.02 SnI 2.98 Br 0.02 Pero...

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Abstract

The present invention provides a preparation method of a lead-free tin-based halide perovskite thin-film solar cell. The preparation method is characterized by comprising the following steps: step one, dissolving a tin-based source compound, an organic and inorganic source halide and a polyphenyl aromatic amine compound in a mixed polar solvent in advance, at the same time adding tin fluoride as an antioxidant, and preparing a precursor solution; and step two, spin-coating the perovskite precursor solution on a prepared substrate plate, and then conducting an annealing treatment after the spin-coating is completed to obtain the tin-based halide perovskite thin film. The lead-free tin-based halide perovskite thin film has advantages of being good in film forming property, high in crystallinity and good in stability, and the lead-free perovskite solar cell which is friendly to environment and relatively high in stability and photoelectric conversion efficiency can be prepared based on the lead-free tin-based halide perovskite thin film.

Description

technical field [0001] The invention relates to a lead-free tin-based halide perovskite, in particular to a preparation method and application of a lead-free tin-based halide perovskite, and belongs to the technical field of solar cells. Background technique [0002] A solar cell is an optoelectronic device that can directly convert solar energy into electrical energy. Perovskite solar cells are a new type of solar cells prepared by using a class of organic-inorganic metal halides as light-absorbing materials. Perovskite solar cells have attracted great attention due to their low cost, simple fabrication process, and high photoelectric conversion efficiency. At present, the efficiency value of the laboratory has exceeded 24.2%, which has very great application potential. However, the current high-efficiency hybrid perovskite materials usually contain the toxic heavy metal element lead, and the toxicity of lead is a huge problem for the future real commercial production and...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/61C09D7/63C09D5/32H01L51/42H01L51/46H01L51/48
CPCC09D1/00C09D7/61C09D7/63C09D5/32H10K71/12H10K85/111H10K85/30H10K30/15Y02E10/549
Inventor 曹昆许新陈淑芬黄维
Owner NANJING UNIV OF POSTS & TELECOMM
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