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Layered hybrid thin film with adjustable band gap and preparation method of layered hybrid thin film

A hybrid and layered technology, applied in the field of materials, can solve the problems that batteries can only be stored in an inert gas environment, battery efficiency declines, and lead content is not solved, so as to achieve environmental protection, reduce use, and improve The effect of stability

Inactive Publication Date: 2016-07-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In 2013, Henry J. Snaith of Oxford University first reported CH 3 NH 3 SnI 3 Based on perovskite solar cells, and achieved 6.4% efficiency, but the efficiency of the cell decays very quickly in air
In April 2014, MercouriG.Kanatzidis of Northwestern University reported that CH 3 NH 3 sn x Pb 1-x I 3 Based on perovskite solar cells, and achieved 7.37% efficiency, but the cells can only be stored in an inert gas environment
In 2014, IanC.Smith of Stanford University in the United States first introduced layered organic-inorganic perovskite hybrids (C 6 h 5 C 2 h 4 NH 3 ) 2 (CH 3 NH 3 ) 2 Pb 3 I 7 Applied to perovskite solar cells and achieved an efficiency of 4.73%, but did not solve the problem of lead content

Method used

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  • Layered hybrid thin film with adjustable band gap and preparation method of layered hybrid thin film
  • Layered hybrid thin film with adjustable band gap and preparation method of layered hybrid thin film
  • Layered hybrid thin film with adjustable band gap and preparation method of layered hybrid thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 0.1992gC in the MBRAUN glove box filled with high-purity nitrogen, the water pressure and oxygen partial pressure are both ≤0.1ppm 6 h 5 C 2 h 4 NH 3 I, 0.0149gSnI 2 , 0.1660gPbI 2 Mix, take 1 mL of N,N-dimethylformamide as a solvent, shake and stir for 10 min to obtain a precursor solution. Use a pipette gun to take 30 μL of the precursor solution on a fluorine-doped tin oxide transparent conductive glass substrate with a size of 15mm×15mm for spin-coating. The speed of the coater is 6000r / min, and the spin-coating time is 30s. The substrate was heat-treated on a heating plate at 100°C for 15 min to obtain a layered hybrid (C 6 h 5 C 2 h 4 NH 3 ) 2 sn 0.1 Pb 0.9 I 4 (x=0.1) Film. The layered hybrid prepared in this example is as figure 1 shown.

Embodiment 2

[0023] Weigh 0.1992gC in the MBRAUN glove box filled with high-purity nitrogen, the water pressure and oxygen partial pressure are both ≤0.1ppm 6 h 5 C 2 h 4 NH 3 I, 0.0447gSnI 2 , 0.1291gPbI 2 Mix, take 1 mL of N,N-dimethylformamide as a solvent, shake and stir for 10 min to obtain a precursor solution. Use a pipette gun to take 30 μL of the precursor solution on a fluorine-doped tin oxide transparent conductive glass substrate with a size of 15mm×15mm for spin-coating. The speed of the coater is 6000r / min, and the spin-coating time is 30s. The substrate was heat-treated on a heating plate at 100°C for 15 min to obtain a layered hybrid (C 6 h 5 C 2 h 4 NH 3 ) 2 sn 0.3 Pb 0.7 I 4 (x=0.3) Film. The layered hybrid prepared in this example is as figure 1 Shown; Place the XRD variation pattern of 30 days in the air as figure 2 Place.

[0024] figure 2 It can be seen that even after 30 days, the hybrid (C 6 h 5 C 2 h 4 NH 3 ) 2 sn 0.3 Pb 0.7 I 4 (x=0.3...

Embodiment 3

[0026] Weigh 0.1992gC in the MBRAUN glove box filled with high-purity nitrogen, the water pressure and oxygen partial pressure are both ≤0.1ppm 6 h 5 C 2 h 4 NH 3 I, 0.0745gSnI 2 , 0.0922gPbI 2Mix, take 1 mL of N,N-dimethylformamide as a solvent, shake and stir for 10 min to obtain a precursor solution. Use a pipette gun to take 30 μL of the precursor solution on a fluorine-doped tin oxide transparent conductive glass substrate with a size of 15mm×15mm for spin-coating. The speed of the coater is 6000r / min, and the spin-coating time is 30s. The substrate was heat-treated on a heating plate at 100°C for 15 min to obtain a layered hybrid (C 6 h 5 C 2 h 4 NH 3 ) 2 sn 0.5 Pb 0.5 I 4 (x=0.5) Film. The layered hybrid prepared in this example is as figure 1 shown.

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Abstract

The invention discloses a layered hybrid thin film with an adjustable band gap and a preparation method of the layered hybrid thin film. The material of the layered hybrid thin film is a layered hybrid. The layered hybrid thin film is prepared by the following steps: mixing iodobenzeneethanamine, stannous iodide and lead iodide at the stoichiometric ratio that x is smaller than or equal to 0.9 and greater than or equal to 0.1, dissolving the mixture with an organic solvent, and shaking and stirring the solution for 5-60 minutes to obtain a precursor solution; and carrying out spin coating on the precursor solution on a substrate in an inert atmosphere environment and carrying out thermal treatment to obtain the hybrid thin film. The crystal structure of the hybrid thin film is in a layered form; the hybrid thin film has good stability in air when x is smaller than 0.7; and the band gap of the hybrid thin film can be adjusted within a range of 1.91eV to 2.33eV along with the difference of the x. According to the hybrid thin film, a Pb element is replaced with an Sn(II) part, and use of Pb is reduced, so that environmental protection is facilitated; and the layered hybrid thin film also has a potential application prospect in the aspect of a photovoltaic device.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a layered hybrid thin film with adjustable band gap. Background technique [0002] Layered organic-inorganic perovskite hybrids are a new type of material composed of organic components and inorganic components at the molecular scale, which can combine the excellent properties of organic materials and inorganic materials. At present, research at home and abroad shows that this type of material has semiconducting properties, photoluminescence, electroluminescence, nonlinear optical properties, magnetic properties and other properties, and is a potential new functional material; this type of material has structural properties. Its uniqueness is that it is a special layered structure formed by alternating inorganic perovskite layers and organic amine cation layers, in which the inorganic layers and organic layers are connected by chemical bonds. Its unique structural ...

Claims

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Application Information

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IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K85/00H10K30/00Y02E10/549
Inventor 刘韩星杜湘军刘克永甘小燕郭丽玲郝华曹明贺
Owner WUHAN UNIV OF TECH
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