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Monomer auto-polymerization assisted synthesized perovskite solar cell and preparation method thereof

A solar cell and self-polymerization technology, which is applied in semiconductor/solid-state device manufacturing, circuits, photovoltaic power generation, etc., can solve the problems of reducing charge extraction and device photoelectric conversion efficiency, poor solubility of macromolecular additives, and difficulty in uniform dispersion of perovskite. , to facilitate the development of commercial applications, inhibit the formation of lead-rich and cesium-rich impurity phases, and increase the viscosity

Pending Publication Date: 2022-04-05
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing additives are organic compounds, which can be divided into small molecular additives and macromolecular additives, but small molecular additives are easy to decompose and lose their effect during the high temperature annealing process of perovskite preparation, while macromolecular additives have poor solubility and are in It is difficult to disperse uniformly inside the perovskite, and cannot fully play an active role, and it is easy to become the center of charge recombination and induce the formation of defect states
In addition, during the annealing process, the volume expansion and contraction coefficients of the perovskite film are different from those of the substrate, resulting in residual tensile and compressive stress, which distorts the perovskite lattice and produces a large number of non-radiative recombination defect states. Reduced charge extraction and photoelectric conversion efficiency of the device

Method used

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  • Monomer auto-polymerization assisted synthesized perovskite solar cell and preparation method thereof
  • Monomer auto-polymerization assisted synthesized perovskite solar cell and preparation method thereof
  • Monomer auto-polymerization assisted synthesized perovskite solar cell and preparation method thereof

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Embodiment 1

[0030] 1. Prepare 0.5mol / L ethanol solution of isopropyl titanate, prepare 0.1g / mL titanium dioxide slurry, prepare 0.04mol / L titanium tetrachloride aqueous solution, and prepare DMF solution with a concentration of 1mol / L lead bromide , to prepare an aqueous solution of 250 mg / mL cesium bromide added with a concentration of 0.25 mg / mL N-methylolacrylamide;

[0031] 2. Spin-coat 90 microliters of the isopropyl titanate ethanol solution on the FTO conductive glass for 30 seconds (rotating speed is 7000 rpm) and calcinate at 550° C. for 2 hours to obtain a dense layer of titanium dioxide; After 1 liter of the titanium dioxide slurry was spin-coated on the dense layer of titanium dioxide for 30 seconds (3000 rpm) and calcined at 450° C. for 60 minutes, the titanium dioxide mesoporous layer was obtained; the titanium dioxide mesoporous layer was soaked in the tetrachloride Put in titanium dioxide solution for 30 minutes, heat in a water bath at 75°C, wash and then calcinate at 450...

Embodiment 2

[0036] 1. Prepare 0.5mol / L ethanol solution of isopropyl titanate, prepare 0.1g / mL titanium dioxide slurry, prepare 0.04mol / L titanium tetrachloride aqueous solution, and prepare DMF solution with a concentration of 1mol / L lead bromide , to prepare an aqueous solution of 250 mg / mL cesium bromide added with a concentration of 0.5 mg / mL N-methylolacrylamide;

[0037] 2. Spin-coat 90 microliters of the isopropyl titanate ethanol solution on the FTO conductive glass for 30 seconds (rotating speed is 7000 rpm) and calcinate at 550° C. for 2 hours to obtain a dense layer of titanium dioxide; After 1 liter of the titanium dioxide slurry was spin-coated on the dense layer of titanium dioxide for 30 seconds (3000 rpm) and calcined at 450° C. for 60 minutes, the titanium dioxide mesoporous layer was obtained; the titanium dioxide mesoporous layer was soaked in the tetrachloride Put in titanium dioxide solution for 30 minutes, heat in a water bath at 75°C, wash and then calcinate at 450°...

Embodiment 3

[0042] 1. Prepare 0.5mol / L ethanol solution of isopropyl titanate, prepare 0.1g / mL titanium dioxide slurry, prepare 0.04mol / L titanium tetrachloride aqueous solution, and prepare DMF solution with a concentration of 1mol / L lead bromide , to prepare an aqueous solution of 250 mg / mL cesium bromide added with a concentration of 0.75 mg / mL N-methylolacrylamide;

[0043] 2. Spin-coat 90 microliters of the isopropyl titanate ethanol solution on the FTO conductive glass for 30 seconds (rotating speed is 7000 rpm) and calcinate at 550° C. for 2 hours to obtain a dense layer of titanium dioxide; After 1 liter of the titanium dioxide slurry was spin-coated on the dense layer of titanium dioxide for 30 seconds (3000 rpm) and calcined at 450° C. for 60 minutes, the titanium dioxide mesoporous layer was obtained; the titanium dioxide mesoporous layer was soaked in the tetrachloride Put in titanium dioxide solution for 30 minutes, heat in a water bath at 75°C, wash and then calcinate at 450...

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Abstract

The invention provides a perovskite solar cell synthesized under the assistance of monomer auto-polymerization and a preparation method thereof, and the method specifically comprises the following steps: adding an easily-polymerized monomer into a cesium bromide aqueous solution, then spin-coating the monomer on a titanium dioxide mesoporous electronic layer loaded lead bromide film, and introducing a monomer auto-polymerization assisted grain growth strategy to prepare the perovskite solar cell. A perovskite film is synthesized through a two-step spin-coating method, and finally, a carbon electrode is scraped and coated to assemble the solar cell. A two-step method capable of accurately controlling the raw material ratio is adopted, monomer additive self-polymerization is utilized to regulate the crystallization speed of perovskite, an electron-donating group of a monomer passivates metal ion state defects of perovskite, monomer self-polymerization provides a space for growth of crystal grains, stress generated in the annealing process of the perovskite thin film is eliminated, and the perovskite thin film is prepared. The high-purity perovskite thin film with large grain size, low defect state density, high energy level matching degree and low surface roughness is prepared, and the photovoltaic performance of the cell is improved. The method is simple in preparation steps, high in repeatability, green and economical, and has commercial application prospects.

Description

technical field [0001] The invention belongs to the field of new energy technology and solar cells, and in particular relates to a perovskite solar cell synthesized with self-polymerized monomers as additives and a preparation method thereof. Background technique [0002] The perovskite light-absorbing layer is a key part of the perovskite solar cell device. The organic bonding energy between the organic cation and the crystal structure in the organic-inorganic hybrid perovskite material is low, and the stability is poor. When the external environment When changes occur, it is very easy to have extremely destructive irreversible reactions with water, oxygen, etc., and break away from the original structure, causing the perovskite structure to decompose, seriously reducing the operational stability of perovskite solar cells. The stability and weather resistance of the all-inorganic perovskite structure are significantly higher, and the assembled cells have stable and good pho...

Claims

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Application Information

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IPC IPC(8): H01L51/48H01L51/46H01L51/42
CPCY02E10/549
Inventor 贺本林汪苏东矫玉静陈海燕
Owner OCEAN UNIV OF CHINA
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