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Method for improving perovskite performance by changing perovskite unit cell parameters

A unit cell parameter and perovskite technology, applied in chemical instruments and methods, inorganic chemistry, tin compounds, etc., can solve problems such as easy decomposition, poor stability, and limit the application of perovskite films, so as to improve performance, Excellent quality, effect of improving energy band structure

Pending Publication Date: 2020-06-12
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, perovskite films prepared by traditional techniques have poor stability and are easy to decompose under conditions such as light, water, oxygen, and ultraviolet rays, which severely limits the application of perovskite films in the field of optical devices.

Method used

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  • Method for improving perovskite performance by changing perovskite unit cell parameters
  • Method for improving perovskite performance by changing perovskite unit cell parameters
  • Method for improving perovskite performance by changing perovskite unit cell parameters

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Experimental program
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Embodiment approach

[0034] As an embodiment of the present invention, preferably, the perovskite material includes a structure of ABX 3 、A 2 C 1 D. 1 x 6 or A 2 B x C 1-x DX 6 (03 ,MASnI 3 ,FAPbI 3 ,CsSnI 3 ,MASnBr 3 ,CsSnCl 2 ,Cs 2 SnI 6 ,Cs 2 SnBr 6 ,MAGeI 3 ,CsGeI 3 ,CsGeBr 3 ,CsGeBr 3 ,CsGe 0.5 sn 0.5 I 3 ,CaTiO 3, SrTiO 3 , Cs 2 AgBr 6 ,Cs 2 AgBiCl 6 , Cs 2 AgInBr 6 , Cs 2 AgInCl 6 , Ba 2 Bi x Sb 1-x VO 6 One or more of (0

[0035] As an embodiment of the present invention, the specified gas experiment environment preferably includes one or more of nitrogen, argon, dry hot air, and helium.

[0036] As an embodiment of the present invention, when the perovskite material is doped with atoms, ions, or molecules, preferably, the doping ionization means include impact ionization, photoionization, thermal ionization, plasma, electrolysis, One or several chemical ionization methods.

[0037] As an embodiment of the present invention, when the p...

Embodiment 1

[0039] Embodiment 1: Based on light atom doping and ultra-thin perovskite film preparation method, it is used to prepare high-performance ultra-thin perovskite film.

[0040] Clean the transparent glass substrate ultrasonically with glass cleaner for 30 minutes, then scrub it with a lint-free cloth, then ultrasonically clean it with deionized water for 60 minutes, then ultrasonically clean it with ethanol for 40 minutes, take out the glass substrate and dry it in an oven at 60°C, and perform UV cleaning before use to ensure Wettability of transparent glass; spin-coating Cs by thermal spin coating 2 AgBr 6 Inorganic perovskite film, put 1mmol of cesium bromide, 0.5mmol of bismuth bromide and 0.5mmol of silver bromide in 1ml of DMSO, place on a hot stage at 100°C, stir at 500rpm[r / min] until the solute Dissolve completely to form a transparent mixed precursor solution. Use the spinning high-speed thermal spin coating scheme (spinning parameter: 500rpm[r / min], 30s high-speed par...

Embodiment 2

[0042] Clean the transparent glass substrate ultrasonically with glass cleaner for 30 minutes, then scrub it with a lint-free cloth, then ultrasonically clean it with deionized water for 60 minutes, and then use ethanol to ultrasonically clean it for 40 minutes. Take out the transparent glass and dry it in an oven at 60°C. Wettability of transparent glass; spin coating of CsPbI by thermal spin coating 3 Inorganic perovskite film, put 0.5mmol of cesium iodide and 0.5mmol of lead iodide in 1ml of DMF, place on a hot stage at 30°C, stir at 500rpm[r / min] until the solute is completely dissolved and form a transparent Mix the precursor solution, and use the spinning high-speed thermal spin coating scheme (spinning parameter: 500rpm[r / min], 10s high-speed parameter: 2000rpm[r / min], 30s) to put the precursor hot solution (100℃) on the transparent glass A flat and dense perovskite film is formed on the substrate, and the obtained precursor film is placed on a hot stage for annealing t...

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Abstract

The invention discloses a method for improving perovskite performance by changing perovskite unit cell parameters. Ions, atoms or molecules are doped into a lattice structure of the perovskite material to change perovskite unit cell parameters, so that the energy band structure, the carrier mobility and the carrier lifetime of the perovskite material are improved, the luminescence characteristic,the microstructure morphology of the material, the stability of the material and the like are coordinated, and the performance of the perovskite material is further improved. The method comprises thefollowing steps: synthesizing a perovskite material with a chemical formula of ABX3, A2C1D1X6 or A2BxC1-xDX6 (0 < x < 1), and doping electrons, ions, atoms, molecules and the like into a perovskite structure to improve the performance and the stability of the perovskite structure. The method is low in cost and remarkable in effect, is suitable for preparing the high-quality and high-stability perovskite material and has industrial production potential. The obtained perovskite material can be applied to the fields of photoelectric, ferroelectric and piezoelectric functional devices such as perovskite solar cells, light emitting diodes, micro-sensing devices, lasers, photoelectric detectors, photosensitive diodes and thin film transistors.

Description

technical field [0001] The invention belongs to the field of photoelectric, ferroelectric, and piezoelectric functional materials and devices, and specifically relates to a method for improving the performance of perovskite by changing unit cell parameters of perovskite and related applications of perovskite materials. Background technique [0002] Due to the non-renewable and pollution problems of fossil energy, it is of epoch-making significance to explore a renewable and low-pollution energy acquisition method, and the development and application of solar cells can solve this problem well. The groundbreaking discovery of perovskite solar cells has revolutionized third-generation photovoltaics. In the past five years, during the research and development of perovskite solar cells, their efficiency has increased to 25.2%. This research progress on perovskite cells shows that perovskite solar cells have the potential to become high-efficiency solar energy conversion devices....

Claims

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Application Information

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IPC IPC(8): C03C17/22C03C17/00C01G19/00C01G17/00
CPCC03C17/22C03C17/001C01G17/006C01G19/006C03C2217/28C03C2218/116C03C2218/32C01P2002/34
Inventor 隋曼龄牟许霖卢岳张泽宇
Owner BEIJING UNIV OF TECH
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