Two-dimensional perovskite thin film material, solar cell and preparation method of two-dimensional perovskite thin film material

A technology for solar cells and thin-film materials, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems that affect the performance of perovskite materials, and achieve the effects of short preparation cycle, good application prospects, and large grain size

Active Publication Date: 2021-08-20
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tail of the organic part of the organic large cation stabilizes the overall structure through the van der Waals interaction force, but there are hydrogen bonds between the organic part of the cation, the hydrogen atoms on the amino groups at both ends and the two-dimensional inorganic perovskite sheet structure, thus The van der Waals gap between layers is eliminated, which affects the performance of perovskite materials

Method used

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  • Two-dimensional perovskite thin film material, solar cell and preparation method of two-dimensional perovskite thin film material
  • Two-dimensional perovskite thin film material, solar cell and preparation method of two-dimensional perovskite thin film material
  • Two-dimensional perovskite thin film material, solar cell and preparation method of two-dimensional perovskite thin film material

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Effect test

Embodiment 1

[0028] A two-dimensional perovskite film material, wherein n is equal to 1, and the chemical composition of the perovskite film material is (CaBr) 2 PB 4 , take 0.05mL dimethyl sulfoxide and 0.2mL dimethylformamide to configure a mixed solvent, add 0.45mmol lead iodide, 0.18mmol chloromethylamine, 0.45mmol calcium bromide and 0.45mmol calcium iodide to the mixed solvent In the process, the precursor solution was obtained after magnetic oscillation for 10 minutes and stirred for 12 hours. The film was formed on the surface of the spin coater at a speed of 5000 rpm, and 1 mL of ether was added dropwise 20 seconds before the end of the spin coating, and annealed on a heating table at 110 ° C for 20 minutes. The final chemical composition is (CaBr) 2 PB 4 Two-dimensional perovskite thin film materials.

Embodiment 2

[0030] A two-dimensional perovskite film material, wherein n is equal to 1, and the chemical composition of the perovskite film material is (CaBr) 2 PB 4 , take 0.05mL dimethyl sulfoxide and 0.2mL dimethylformamide to configure a mixed solvent, add 0.45mmol lead iodide, 0.18mmol chloromethylamine, 0.45mmol calcium bromide and 0.45mmol calcium iodide to the mixed solvent In the process, the precursor solution was obtained after magnetic oscillation for 10 minutes and stirring for 12 hours, and a film was formed on the surface of the spin coater at a speed of 5000 rpm. 1 mL of ether was added dropwise 20 seconds before the end of the spin coating, and placed on a heating table at 130 ° C for 20 minutes. The final chemical composition is (CaBr) 2 PB 4 Two-dimensional perovskite thin film materials.

Embodiment 3

[0032] A method for preparing a two-dimensional perovskite solar cell, wherein the chemical composition of the perovskite light-absorbing layer material is (CaBr) 2 FA 19 Pb 20 I 61 , including the following steps:

[0033] Step 1. Cleaning of FTO conductive glass. Ultrasonic cleaning of FTO conductive glass with acetone, isopropanol, ethanol, and deionized water in sequence. The cleaning time of each solvent is 30 minutes. After cleaning, transfer the FTO conductive glass to 120°C Fully dry in an oven to remove moisture and impurities on the surface, and then treat the dried FTO conductive glass with a UV-ozone device for 30 minutes, waiting for use.

[0034] Step 2. Prepare a dense film layer. Take 160 μL of titanium diisopropoxybisacetylacetonate and add 1 mL of anhydrous n-butanol. After shaking well, spin-coat the mixed solution onto the FTO conductive glass at a speed of 2000 rpm, and then Anneal at 120°C for 10 minutes.

[0035] Step 3. Prepare a mesoporous film la...

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Abstract

The invention discloses a two-dimensional perovskite thin film material, a solar cell and a preparation method of the two-dimensional perovskite thin film material. Lead iodide, formamidine iodide, chloromethylamine, calcium bromide and calcium iodide are used as raw materials, dimethylformamide and dimethyl sulfoxide are used as a mixed solvent to prepare a perovskite precursor solution, and the film material is obtained through annealing after spin coating. The solar cell sequentially comprises a conductive substrate, an electron transport layer and a perovskite light absorption layer, a perovskite precursor solution is spin-coated on the conductive substrate coated with the electron transport layer, and the two-dimensional perovskite solar cell is prepared after annealing. The two-dimensional perovskite thin film material is used as a perovskite light absorption layer material in a solar cell. The chemical composition of the two-dimensional perovskite thin film is (CaBr) 2 (FA) n-1PbnI3n + 1, wherein FA is formamidine cations. According to the preparation method provided by the invention, the two-dimensional perovskite thin film material with relatively high crystallinity and relatively good performance can be obtained so that the photoelectric performance and efficiency of the perovskite solar cell are improved.

Description

technical field [0001] The invention belongs to the technical field of perovskite thin film materials, and in particular relates to a two-dimensional perovskite thin film material, a solar cell and a preparation method thereof. Background technique [0002] Perovskite materials have excellent photoelectric properties and have attracted much attention from researchers. The development of perovskite solar cells is extremely rapid. In just ten years, the efficiency has increased from 3.8% to more than 25%. Among the light-absorbing layer materials of perovskite solar cells, most researchers choose three-dimensional CH 3 NH 3 PB 3 (MAPbI 3 ) perovskite materials, because of their outstanding natural advantages, such as high light absorption coefficient, good bipolar transport properties of electrons and holes, tunable band gap, small exciton binding energy and high loading capacity. The carrier diffusion length, etc., are also widely used in light-emitting diodes, lasers, ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/46H01L51/42H01L51/48
CPCH10K71/12H10K85/321H10K30/00Y02E10/549Y02P70/50
Inventor 曹晖朱荣志刘洋洋刘旭豪刘路杰徐晨鑫陶涛
Owner NANJING UNIV OF INFORMATION SCI & TECH
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