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Perovskite heterojunction structure and preparation method and application thereof

A perovskite, heterojunction technology, applied in final product manufacturing, sustainable manufacturing/processing, semiconductor/solid-state device manufacturing, etc., which can solve the problem of carrier transport inhibition, insufficient contact, sacrificial charge carrier extraction Efficiency and other issues to achieve high performance

Active Publication Date: 2020-06-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The interfacial connection between the layered perovskite and the three-dimensional perovskite is formed by the van der Waals force between the organic cations. The three-dimensional perovskite and the layered perovskite are separated by bulky cations, and the contact is not close enough. , the electron clouds do not overlap significantly, and the carrier transport is suppressed. Therefore, so far, devices based on "3D perovskite / layered perovskite" heterojunctions, compared with pure 3D perovskite devices, still sacrifice some of the charge carrier extraction efficiency

Method used

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  • Perovskite heterojunction structure and preparation method and application thereof
  • Perovskite heterojunction structure and preparation method and application thereof
  • Perovskite heterojunction structure and preparation method and application thereof

Examples

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Embodiment 1

[0037] Example 1 In three-dimensional perovskite MAPbI 3 Epitaxy (BA) 2 MA n-1 Pbn I 3n+1 (n=1,2,3)

[0038] In an embodiment of the present invention, a method for preparing a perovskite heterojunction structure comprises the following steps:

[0039] Step 1: Preparation of MAPbI 3 Single crystal:

[0040] 1.1) MAI:PbI 2 Mix according to a certain molar ratio, add GBL solvent dropwise to configure a certain concentration of MAPbI 3 Precursor solution, divide the solution into two parts, one part is numbered A, and the other is numbered B, then place the solution on the hot stage and stir it with a magnet at room temperature to accelerate the dissolution;

[0041] 1.2) Taking the temperature inversion growth method as an example, put B in a high-temperature oil bath, wait for many crystal seeds to grow in B, then put the crystal seeds in B into A, and then increase the temperature every day, due to the temperature of the solution The increase will lead to a decrease in...

Embodiment 2

[0060] Example 2 In three-dimensional perovskite MAPbBr 3 Epitaxy (BA) 2 PbBr 4 (n=1)

[0061] In an embodiment of the present invention, a method for preparing a perovskite heterojunction structure comprises the following steps:

[0062] Step 1: Preparation of MAPbBr 3 Single crystal:

[0063] 1.1) MABr:PbBr 2 Mix according to a certain molar ratio, add DMF solvent dropwise to make a solution with a concentration of 550mg / mL, divide the solution into two parts, one part is A, and the other part is B, then place the solution on a hot stage and keep it under room temperature Use magnetic stirring to accelerate dissolution;

[0064] 1.2) Taking the inversion growth method as an example, put B in a high-temperature oil bath, wait for many crystal seeds to grow in B, then put the crystal seeds in B into A, and then increase the temperature of the oil bath every day, because The increase of the solution temperature will lead to a decrease in the solubility of the solution, s...

Embodiment 3

[0072] Example 3 In three-dimensional perovskite MAPbBr 3 Epitaxy (BA) 2 MAPb 2 I 7 (n=2)

[0073] In an embodiment of the present invention, a method for preparing a perovskite heterojunction structure comprises the following steps:

[0074] Step 1: Preparation of MAPbBr 3 Single crystal:

[0075] 1.1) MABr:PbBr 2 Mix according to a certain molar ratio, add DMF solvent dropwise to make a solution with a concentration of 550mg / mL, divide the solution into two parts, one part is A, and the other part is B, then place the solution on a hot stage and keep it under room temperature Use magnetic stirring to accelerate dissolution;

[0076] 1.2) Taking the inversion growth method as an example, put B in a high-temperature oil bath, wait for many crystal seeds to grow in B, then put the crystal seeds in B into A, and then increase the temperature of the oil bath every day, because The increase of the solution temperature will lead to a decrease in the solubility of the soluti...

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Abstract

The invention discloses a perovskite heterojunction structure and a preparation method and application thereof. The heterojunction is composed of three-dimensional perovskite and layered perovskite, and the layered perovskite is formed by lattice matching epitaxy of the three-dimensional hybrid perovskite. According to the invention, the three-dimensional perovskite / layered perovskite heterojunction is formed by lattice matching epitaxial growth; the layered perovskite can be induced to be directionally arranged on the surface of the three-dimensional perovskite, so the layered perovskite is used as a protection layer of the three-dimensional perovskite; meanwhile, two material phases with different electronic structures are combined together in a chemical bond manner, so the degree of theclose contact reaches the atomic level, and therefore, the significant effects of electron cloud overlapping, lattice modulation, interface stress and the like can be generated; a new interface electron structure and a new energy band bending phenomenon can be formed, and the phenomena of interface charge transfer, energy transfer, carrier migration, compounding and the like can be significantlyaffected.

Description

technical field [0001] The invention belongs to the field of perovskite photoelectric devices, and relates to a perovskite heterojunction structure and its preparation method and application, in particular to a calcium oxide formed at the interface between a three-dimensional perovskite and a layered perovskite due to lattice matching. Titanium heterojunction, and functional devices based on this heterojunction. Background technique [0002] Three-dimensional hybrid perovskites have great potential in the field of photovoltaics due to their high absorption efficiency, long carrier lifetime, high carrier mobility, large carrier diffusion length, and low cost. is one of the most active areas of research. Although the performance of three-dimensional organic-inorganic hybrid solar cells has improved at an astonishing rate from the initial photoelectric conversion efficiency of 3.8% in 2009 to the currently certified 23.7%, and the efficiency has reached commercial silicon sola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/48H01L51/42
CPCH10K71/12H10K30/00Y02E10/549Y02P70/50H10K85/50
Inventor 袁永波陈逸夫王继飞罗师强
Owner CENT SOUTH UNIV