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Chitosan/perovskite nanometer composite film as well as preparation method and application thereof

A nano-composite and chitosan technology, applied in the fields of photoelectrochemistry and polymer chemistry, can solve the problems of poor film-forming properties of perovskite films, and achieve the effects of excellent mechanical properties, clean preparation process and improved filling rate.

Active Publication Date: 2015-07-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the interaction between chitosan and nanoparticles, the formation and growth of perovskite crystals are effectively controlled, and a relatively ideal perovskite film is obtained, which successfully solves the problem of the formation of perovskite films prepared by traditional chemical methods. The problem of poor membrane properties

Method used

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  • Chitosan/perovskite nanometer composite film as well as preparation method and application thereof
  • Chitosan/perovskite nanometer composite film as well as preparation method and application thereof
  • Chitosan/perovskite nanometer composite film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 1g of chitosan and dissolve in 100ml 2% (v / v) hydroiodic acid aqueous solution, stir at 1000rpm at 0°C for 8h, add enough acetone to the solution until no precipitation occurs. The obtained precipitate was washed several times with ether until the filtrate was completely colorless, and the obtained solid was chitosan iodide (CS·HI). The obtained solid was dried in a vacuum oven at 50° C. overnight. The preparation method of the methylamine salt is prepared with reference to the literature. Weigh respectively 0.083g methylamine salt, 0.2487g PbI 2 , was dissolved in 2ml of DMF with a density of 0.95g / ml, and after passing nitrogen gas for 10min, it was stirred at 500rpm in the dark at 60°C for 8 hours. After the reaction was completed, the resulting solution was filtered through a PTFE filter with a pore size of 0.45 μm. The resulting solution was spin-coated onto an ITO-coated glass slide. Measure the UV-Vis spectrum.

Embodiment 2

[0037] Weigh 1g of chitosan and dissolve in 100ml 2% (v / v) hydroiodic acid aqueous solution, stir at 1000rpm at 0°C for 8h, add enough acetone to the solution until no precipitation occurs. The obtained precipitate was washed several times with ether until the filtrate was completely colorless, and the obtained solid was chitosan iodide (CS·HI). The obtained solid was dried in a vacuum oven at 50° C. overnight. Weigh 0.0004g CS·HI, 0.083g methylamine salt, 0.2487g PbI 2 , was dissolved in 2ml of DMF with a density of 0.95g / ml, and after passing nitrogen gas for 10min, it was stirred at 500rpm in the dark at 60°C for 8 hours. After the reaction was completed, the resulting solution was filtered through a PTFE filter with a pore size of 0.45 μm. The resulting solution was spin-coated onto an ITO-coated glass slide. Measure the UV-Vis spectrum.

Embodiment 3

[0039] Weigh 1g of chitosan and dissolve in 100ml 2% (v / v) hydroiodic acid aqueous solution, stir at 1000rpm at 0°C for 8h, add enough acetone to the solution until no precipitation occurs. The obtained precipitate was washed several times with ether until the filtrate was completely colorless, and the obtained solid was chitosan iodide (CS·HI). The obtained solid was dried in a vacuum oven at 50° C. overnight. Weigh 0.0008g CS HI, 0.083g methylamine salt, 0.2487g PbI 2 , was dissolved in 2ml of DMF with a density of 0.95g / ml, and after passing nitrogen gas for 10min, it was stirred at 500rpm in the dark at 60°C for 8 hours. After the reaction was completed, the resulting solution was filtered through a PTFE filter with a pore size of 0.45 μm. The resulting solution was spin-coated onto an ITO-coated glass slide. Measure the UV-Vis spectrum.

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Abstract

The invention discloses a chitosan / perovskite nanometer composite film as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing chitosan iodide; (2) dissolving methylamine salt, the chitosan iodide and lead iodide or lead chloride in DMF in a closed environment; introducing a protective gas; stirring for 6h to 10h at the temperature of 55 to 65 DEG C to prepare a perovskite precursor solution; (3) spin-coating the obtained perovskite precursor solution to obtain the chitosan / perovskite nanometer composite film. The prepared chitosan / perovskite nanometer composite film is applied to a solar photocell structure and has the advantages of effectively increasing the filling rate of a solar cell and also improving the energy transformation efficiency of the cell to a certain extent. The preparation method disclosed by the invention is clean, simple and free of pollution in preparation process and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a chitosan / perovskite nanocomposite film used for photoelectric materials and a bionic preparation method and application thereof, belonging to the fields of photoelectrochemistry and polymer chemistry. Background technique [0002] Solar cells convert solar energy into electrical energy, which has the characteristics of low cost, safety and reliability, and is a promising renewable energy source. Photosensitizers are key materials for preparing solar cells. Organometal halide perovskite is a new type of photosensitizer that has attracted wide attention in recent years. It has unique optical properties, excitonic properties, magnetic properties and electrical conductivity, and can prepare higher-performance solar cells at a lower cost. Although a large number of studies on organohalide perovskites have been reported in the past few years, several key issues still remain in the construction of perovskite-based thin-film solar c...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/08C08B37/08
Inventor 王小慧杨洋孙润仓
Owner SOUTH CHINA UNIV OF TECH
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