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Mixed polycation perovskite material film with optical gain characteristic as well as preparation method and application thereof

A multi-cation, optical gain technology, applied in the field of mixed multi-cation perovskite material thin film and its preparation, can solve the problems of high current density, large non-radiative recombination, stability, poor light resistance, etc., and achieve high crystal quality, shape and shape. The appearance is smooth and flat, no pinholes, and the effect of improving stability

Active Publication Date: 2020-11-10
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the current research on optically pumped perovskite lasers has been relatively sufficient, due to the stability of the material itself, poor light resistance, defects leading to large non-radiative recombination and low intrinsic gain, etc., hindered the development of perovskite lasers. Practical application of mineral pump laser
In addition, compared with optically pumped lasers, electrical pumping is a commonly used excitation method in commerce. However, it is still challenging to realize electrically pumped lasers.
On the one hand, the current density required to reach the carrier density threshold for lasing is high
On the other hand, the heating effect of the electrically pumped device must be reduced, because the higher charge injection density may destroy the gain medium

Method used

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  • Mixed polycation perovskite material film with optical gain characteristic as well as preparation method and application thereof
  • Mixed polycation perovskite material film with optical gain characteristic as well as preparation method and application thereof
  • Mixed polycation perovskite material film with optical gain characteristic as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] A method for preparing a mixed polycation material with optical gain properties, comprising the following steps:

[0081] 1) MABr, FABr, CsBr and PbBr 2 Dissolve in anhydrous dimethylsulfoxide (DMSO) according to the molar ratio of 2.2:0.05:0.05:1, heat and stir at 30°C for 20h to form [MA 0.87 (FACs) 0.13 ]PbBr 3 3D mixed-cation perovskite precursor solution at a concentration of 0.2 mol L -1 ;

[0082] 2) BABr and PbBr 2 Dissolve in anhydrous dimethyl sulfoxide (DMSO) at a ratio of 2:1 to form 2D perovskite (BA) 2 PbBr 4 Precursor solution with a concentration of 0.1mol L -1 ;

[0083] 3) Mix the precursor solutions of the above two perovskites in equal volumes to obtain a multi-cation mixed perovskite material [[MA 0.87 (FACs) 0.13 ]PbBr 3 ] 0.5 [(BA) 2 PbBr 4 ] 0.1 The precursor solution;

[0084] 4) Use a pipette gun to take 100 μL of the above-mentioned perovskite precursor solution and drop it on the glass substrate. -1 Rotate at a rotating speed...

Embodiment 2

[0087] A method for preparing a mixed polycation material with optical gain properties, comprising the following steps:

[0088] 1) FABr, MABr, CsBr and PbBr 2 Dissolve in anhydrous dimethylsulfoxide (DMSO) according to the molar ratio of 2.2:0.05:0.05:1, heat and stir at 30°C for 20h to form [FA 0.87 (MACs) 0.13 ]PbBr 3 3D mixed-cation perovskite precursor solution at a concentration of 0.5 mol L -1 ;

[0089] 2) NMABr and PbBr 2 Dissolved in anhydrous dimethyl sulfoxide (DMSO) at a ratio of 2:1 to form 2D perovskite (NMA) 2 PbBr 4 Precursor solution with a concentration of 0.2mol L -1 ;

[0090]3) Mix the precursor solutions of the above two perovskites in equal volumes to obtain a multi-cation mixed perovskite material [[FA 0.87 (MACs) 0.13 ]PbBr 3 ] 0.5 [(NMA) 2 PbBr 4 ] 0.2 The precursor solution;

[0091] 4) Use a pipette gun to take 60 μL of the above-mentioned perovskite precursor solution and drop it on the glass substrate. -1 The rotation speed is ro...

Embodiment 3

[0094] A method for preparing a mixed polycation material with optical gain properties, comprising the following steps:

[0095] 1) CsBr, MABr, FABr and PbBr 2 Dissolve in anhydrous N-N dimethylformamide (DMF) according to the molar ratio of 2.2:0.01:0.09:1, heat and stir at 35°C for 20h to form [Cs 0.87 (MAFA) 0.13 ]PbBr 3 3D mixed cation perovskite precursor solution with a concentration of 0.5mol L -1 ;

[0096] 2) PEABr and PbBr 2 Dissolve in anhydrous N-N dimethylformamide (DMF) at a ratio of 2:1 to form 2D perovskite (PEA) 2 PbBr 4 Precursor solution with a concentration of 0.2mol L -1 ;

[0097] 3) Mix the precursor solutions of the above two perovskites in equal volumes to obtain a multi-cation mixed perovskite material [[Cs 0.87 (MAFA) 0.13 ]PbBr 3 ] 0.5 [(PEA) 2 PbBr 4 ] 0.2 The precursor solution;

[0098] 4) Use a pipette gun to take 50 μL of the above-mentioned perovskite precursor solution and drop it on the glass substrate. -1 Rotate at a rotati...

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Abstract

The invention discloses a mixed polycation perovskite material thin film with an optical gain characteristic as well as a preparation method and application thereof. The chemical structural general formula of the mixed polycation perovskite material thin film is [(A0.87 BxCy) PbX3] b [A '2PbX4] c, in A < 0.87 > B < x > C < y >, x + y = 0.13, 0.87 is the mass ratio of the total mass of A to the total mass of A + B + C, x is the mass ratio of the total mass of B to the total mass of A + B + C, and y is the mass ratio of the total mass of C to the total mass of A + B + C, wherein the thickness ofthe mixed polycation perovskite material thin film ranges from 20 nm to 200 nm; the gain coefficient ranges from 800 cm < 1 > to 3000 cm < 1 >; the light emitting wavelength ranges from 510-530nm; and the roughness of the nano titanium dioxide is 0.5-5nm. According to the invention, the optical and thermal stability of the perovskite material and the gain characteristic of the thin film are improved.

Description

technical field [0001] The invention belongs to the field of perovskite materials, in particular, the invention relates to a mixed multi-cation perovskite material thin film with optical gain characteristics and its preparation method and application. Background technique [0002] As an emerging semiconductor optoelectronic material, metal halide perovskite has excellent optoelectronic properties such as large absorption coefficient, low defect state density, high fluorescence quantum yield, tunable luminescence band gap, etc., so it is widely used in the field of optoelectronic devices with broadly application foreground. The general chemical formula of perovskite materials can be expressed as ABX 3 , B ions and X ions can form a regular octahedral structure, where A is Cs + 、CH 3 NH 3 + (MA), HC (NH 2 ) + (FA) etc., B ion is Pb 2+ , Sn 2+ and other cations, X ion is I - 、Br - , Cl - and other anions. At the same time, the ionic radii of A, B, and X determine t...

Claims

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Application Information

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IPC IPC(8): C09K11/06C09K11/66H01S5/30H01S5/36
CPCC09K11/06C09K11/664C09K2211/10H01S5/30H01S5/36
Inventor 张青李美丽尚秋宇
Owner PEKING UNIV
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