Preparation method of perovskite solar cell with perovskite layer passivated by nanofibers

A technology of solar cells and nanofibers, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of low efficiency and poor stability of perovskite cells, and achieve improved photoelectric conversion efficiency, improved performance, and controllable dimensions Effect

Pending Publication Date: 2021-06-22

BEIJING UNIV OF CHEM TECH

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[0003] The purpose of the present invention is to provide a method for preparing solar cells with nanofiber passivation perovskite layer. For current perovskite solar cells, there are still poor water and oxygen stability, which leads to low efficiency of perovskite cells. The problem is that nan...

Abstract

The invention provides a preparation method of a solar cell using nanofibers as a perovskite layer passivation material. The perovskite solar cell comprises a transparent conductive layer, an electron transport layer, a perovskite photosensitive layer, a hole transport layer and a metal electrode layer, and is characterized in that the perovskite layer passivation material is nanofibers, and the nanofibers are prepared by an electrostatic spinning technology. The invention further provides the preparation method of the perovskite solar cell with the perovskite layer passivated by the nanofibers, the perovskite layer is prepared by adopting a method of spin-coating a mixed solution of the perovskite and the nanofibers, wherein the nanofibers can generate strong complexing and coordination effects with lead ions in the perovskite layer, so that electronic defects at crystal boundaries are filled up, and nucleation sites are provided for crystallization of perovskite to induce crystallization, and the energy conversion efficiency of the prepared perovskite cell reaches 20.3%.

Application Domain

Solid-state devicesSemiconductor/solid-state device manufacturing +2

Technology Topic

ChemistryNanofiber +14

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Experimental program(1)

Example Embodiment

[0022] Example 1:

[0023] First, the nanofibers are processed by the mass fraction of 10% by weight of polyacrylonitrile / N, N-dimethylformamide solution processed by electrostatic spinning technology to polymer nanofibers, and the electrospinning parameters are as follows: 1 nozzle and negative high pressure generator Connection, the negative high voltage value is -5 kV; 2 between the nozzle and the receiving plate is 15cm; 3 The receiving plate is connected to the positive high voltage generator, the positive high pressure is + 10 kV; 4 The feed speed is controlled by the pump, the feed speed is 1.0 Ml · h -1 To obtain polymer nanofibers. Then, the polymer nanofibers were held at 240 ° C for 60 minutes under the air atmosphere, and the nitrogen gas was attached to 800 ° C, and the temperature was held in a nitrogen atmosphere for 60 minutes, cooling, and finally nanofibers were obtained. Among them, the rate of temperature and cooling is 5 ° C per minute.

[0024] Next: (1) Conductive glass (SnO doped with fluorine) 2 Conductive glass or indium tin oxide conductive glass is sequentially washed with glass cleaning agent, deionized water, ethanol for 30 minutes, and then nitrogen is blown and cleaned with an ultraviolet ozone cleaning machine.

[0025] (2) Sno with a deionized water and mass fraction of 15 wt% 2 The colloidal aqueous solution was mixed at a volume ratio of 1: 5, and stirred on the conductive glass after stirring for 30 minutes, and annealed at 150 ° C for 30 minutes.

[0026] (3) 600 mg of iodide and 92.3 μl of DMSO were added to 1000 μl of DMF solvent, and the mass of the functionalized nanofibers were incorporated into the solution of 0.2 mg, and the propanmetallic solution solution was obtained; 68.5 mg iodine Hydrazine and 10 mg of methylamine are dissolved in 1000 μl of isopropanol solvent to obtain an amine salt precursor solution. Then spin coated with two-step spin coating in SNO 2 The upper layer. Lead of iodide added in SNO 2 The upper layer was rotated for 20 seconds at a speed of 4000 rpm, and then an amine salt precursor solution was added to the upper upper layer of the iodide after annealing at 70 ° C, and then dripped the amine salt precursor solution to 5000 rpm twice, then At 150 ° C for 20 minutes, it was finally obtained by nanofibers of a perovskite film.

[0027] (4) 73.5 mg spiro-OthAd was dissolved in 1 ml of chlorobenzene, and 29 μl of tetra-butylpyridine (TBP) and 17.5 μL of bistrooprofluoromethane sulfonimide (Li-TFSI) solution (Li-TFSI) The solution was dissolved from 520 mg Li-TFSi in 1 mL of acetonitrile) to give a spiro-ometad mixed solution, and spin coated with a spiro-ometad mixed solution above the perovskite film, spin coating at a rotational speed of 3000 rpm, resulting in a spiro-ometad film .

[0028] (5) AG-deposited 80-100 nm of AG above the spiro-ometad film, finally obtained a perovskite solar cell with nanofiber passivated perovskite layer.

PUM

Property	Measurement	Unit
Diameter	20.0 ~ 500.0	nm
Thickness	100.0 ~ 800.0	nm

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Preparation method of perovskite solar cell with perovskite layer passivated by nanofibers

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