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Dimension-reduced perovskite and its preparation method and application

A dimension-reduced perovskite and perovskite technology, applied in the field of dimension-reduced perovskite and its preparation, can solve problems such as limitations of preparation methods, and achieve the effect of strong controllability and high crystal conversion rate

Active Publication Date: 2022-04-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the present invention provides a dimensionality-reducing perovskite, which can be obtained through mutual transformation between dimensionality-reduction perovskites, which solves the problem that the dimensionality-reduction perovskite needs to be in a pre-designed system. It can only be prepared by crystal growth, and the preparation method is limited

Method used

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  • Dimension-reduced perovskite and its preparation method and application
  • Dimension-reduced perovskite and its preparation method and application
  • Dimension-reduced perovskite and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0079] This embodiment has prepared (MEA) 2 PB 4 , the specific steps are:

[0080] S1: (PDSBA)PbI 4 Preparation of:

[0081] Add 0.5mmol lead iodide, 0.5mmol 2,2'-[propane-2,2-diylbis(thio)]diethylammonium iodate and 3mL hydroiodic acid into the reaction flask, heat at 100°C for half an hour until completely dissolved, then cool the reaction bottle naturally, take out the crystals after 1 day, and store them dry;

[0082] S2: (PDSBA)PbI 4 Convert to (MEA) 2 PB 4 Methods:

[0083] Add 20mg (PDSBA)PbI to the reaction vial 4 Crystal, 0.1mmol iodine element and 1mL dodecanethiol were stirred at room temperature, and the crystal was taken out after 1 day, and washed repeatedly with n-hexane to obtain (MEA) 2 PB 4 crystals.

[0084] The experimental results show that the (MEA) prepared in this embodiment 2 PB 4 , It is red under natural light, and emits green fluorescence under ultraviolet light, and its emission wavelength is 606nm.

[0085] (MEA) prepared in this em...

Embodiment 2

[0087] This embodiment has prepared (PDSBA)PbI 4 , the specific steps are:

[0088] S1: (MEA) 2 PB 4 Preparation of:

[0089] Add 0.2mmol lead iodide, 0.2mmol 2-aminoethanethiol hydrochloride, 1mL hydroiodic acid, 1mL hypophosphorous acid into the reaction flask, heat at 100°C for half an hour until completely dissolved, then transfer the reaction flask to minus 20°C Stand in the refrigerator, take out the crystals after 3 days, and store them dry;

[0090] S2: (MEA) 2 PB 4 Conversion to (PDSBA)PbI 4 Methods:

[0091] Add 20mg (MEA) to the reaction vial 2 PB 4 Put the crystal and 1mL of dodecanethiol in an acetone gas atmosphere, stir at room temperature, take out the crystal after 1 day, and wash it repeatedly with n-hexane to obtain (PDSBA)PbI 4 crystals.

[0092] Experimental result shows, the (PDSBA)PbI that present embodiment prepares 4 , It is orange under natural light, and emits green fluorescence under ultraviolet light, and its emission wavelength is 519n...

Embodiment 3

[0095] This embodiment has prepared (DSBA)PbI 4 , the specific steps are:

[0096] S1: (MEA) 2 PB 4 Preparation of:

[0097] Add 0.2mmol lead iodide, 0.2mmol 2-aminoethanethiol hydrochloride, 1mL hydroiodic acid, 1mL hypophosphorous acid into the reaction flask, heat at 100°C for half an hour until completely dissolved, then transfer the reaction flask to minus 20°C Stand in the refrigerator, take out the crystals after 3 days, and store them dry;

[0098] S2: (MEA) 2 PB 4 Conversion to (DSBA)PbI 4 Methods:

[0099] Add 20mg (MEA) to the reaction vial 2 PB 4 Crystal, 0.1mmol N-iodosuccinimide and 1mL tetrahydrofuran were stirred at room temperature. After 1 day, the crystal was taken out and washed repeatedly with tetrahydrofuran to obtain (DSBA)PbI 4 crystals.

[0100] Experimental result shows, the (DSBA)PbI that present embodiment prepares 4 , It is orange under natural light, and emits green fluorescence under ultraviolet light, and its emission wavelength is 4...

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Abstract

The invention provides dimension-reduced perovskite and its preparation method and application. The dimension-reduced perovskite is obtained through the transformation of another dimension-reduced perovskite, which solves the problem that the current dimension-reduced perovskite needs to be prepared by crystal growth in a pre-designed system, and the preparation method is limited. The preparation method of the dimension-reducing perovskite of the present invention has the advantages of simple synthesis method, mild synthesis condition, high crystal purity, strong controllability and high crystal conversion rate. Different dimensionality-reduced perovskite crystals can be generated by simply changing the reaction additives. The transformation of dimensionality-reduced perovskite crystals is formed at one time, saving time and effort. The invention has strong universality and strong practicability for the same type of crystals, is conducive to popularization and use, and is suitable for fields such as solar cells and light-emitting diodes.

Description

technical field [0001] The invention belongs to the technical field of perovskite materials, and in particular relates to dimensionality-reduced perovskite and its preparation method and application. Background technique [0002] Metal halide perovskite nanocrystals are widely used in optoelectronic applications because of their excellent properties, such as high fluorescence efficiency, long carrier diffusion length, high carrier mobility, tunable emission wavelength, narrow peak half-width, etc. It shows great application potential and is recognized as one of the most promising semiconductor materials. In 2020, the certified efficiency of perovskite / silicon tandem cells prepared by Oxford Photovoltaics reached 29.52%, exceeding the maximum photoelectric conversion efficiency of 27.6% of traditional silicon-based solar panels. [0003] Dimensionality-reduced perovskites can be expressed by the general formula M m A n-1 B n x 3n+1 to represent, where n represents the nu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/24C09K11/06C09K11/66C07C319/06C07C319/14C07C319/24C07C323/25H01L51/46H01L51/54
CPCC07F7/003C07F7/24C09K11/06C09K11/664C07C319/06C07C319/14C07C319/24C09K2211/188H10K85/60H10K85/30C07C323/25Y02E10/549
Inventor 杨振宇赵亮源子龙
Owner SUN YAT SEN UNIV
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