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Quasi-two-dimensional perovskite single crystal and preparation method thereof, perovskite photoelectric detector and preparation method thereof

A photodetector, perovskite technology, applied in the direction of single crystal growth, photovoltaic power generation, single crystal growth, etc., can solve the problems of reducing the photoelectric performance of quasi-two-dimensional perovskite and easily capturing carriers

Active Publication Date: 2022-05-31
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the quasi-two-dimensional perovskite is a large-area quasi-two-dimensional perovskite polycrystal. Due to the existence of grain boundaries in the quasi-two-dimensional perovskite polycrystal, defects are easily formed between the grain boundaries, and it is easy to capture carriers, reducing the quasi-two-dimensional perovskite. Optoelectronic properties of dimensional perovskite

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  • Quasi-two-dimensional perovskite single crystal and preparation method thereof, perovskite photoelectric detector and preparation method thereof
  • Quasi-two-dimensional perovskite single crystal and preparation method thereof, perovskite photoelectric detector and preparation method thereof
  • Quasi-two-dimensional perovskite single crystal and preparation method thereof, perovskite photoelectric detector and preparation method thereof

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[0031] The invention provides a method for preparing a quasi-two-dimensional perovskite single crystal, comprising the following steps:

[0032] According to the chemical formula of quasi-two-dimensional perovskite (LA) 2 A n-1 B n x 3n+1 The measured numbers of LA, A and B in the method are mixed with BO, AX, LAX, HX aqueous solution and co-solvent to obtain mother liquor;

[0033] Transferring the mother liquor to the surface of the substrate to form mother liquor droplets, the surface layer of the mother liquor droplets undergoes self-assembly to form a quasi-two-dimensional perovskite single crystal, and the self-assembly time is ≤ 10s;

[0034] The quasi-two-dimensional perovskite single crystal is separated from the mother liquor droplet.

[0035] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art.

[0036] The present invention according to the chemical formula (LA)...

Embodiment 1

[0104] According to the chemical formula of quasi-two-dimensional perovskite (CH 3 CH 3 CH 3 CH 2 NH 2 ) 2 PB 4 The measured number of n-butylamine and Pb in the formula is to mix PbO, iodine-n-butylamine, hydroiodic acid and hypophosphorous acid aqueous solution; specifically: stir and mix lead oxide, hydroiodic acid and hypophosphorous acid aqueous solution at 100°C for 30min to obtain The first solution, wherein the mass percentage of hydroiodic acid is 57%, the mass percentage of hypophosphorous acid aqueous solution is 1.5%, and the volume ratio of hydroiodic acid and hypophosphorous aqueous solution is 9:1; Iodomethylamine and hydroiodic acid were stirred and mixed at 100°C for 30min to obtain the second solution; the first solution and the second solution were stirred and mixed at 100°C for 1h to obtain the mother liquor, wherein, Pb 2+The molar concentration is 0.59mol / L;

[0105] according to figure 1 As shown, the mother solution cooled to room temperature wa...

Embodiment 2

[0109] According to the chemical formula of quasi-two-dimensional perovskite (CH 3 CH 3 CH 3 CH 2 NH 2 ) 2 CH 3 NH 2 Pb 2 I 7 The metering number of n-butylamine, methylamine and Pb in the mixture, mix PbO, iodine-n-butylamine, hydroiodic acid and hypophosphorous acid aqueous solution; specifically: stir and mix lead oxide, hydroiodic acid and hypophosphorous acid at 100°C 30min, obtain the first solution, wherein the mass percentage composition of hydroiodic acid is 57%, the mass percentage composition of hypophosphorous acid aqueous solution is 1%, and the volume ratio of hydroiodic acid and hypophosphorous acid aqueous solution is 9:1; Butylamine, iodomethylamine and hydroiodic acid were stirred and mixed at 100°C for 30min to obtain the second solution, and the first solution and the second solution were stirred and mixed at 100°C for 1h to obtain the mother liquor, wherein, Pb 2+ The molar concentration is 0.5mol / L;

[0110] according to figure 1 As shown, the ...

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Abstract

The invention belongs to the technical field of preparation of novel materials and semiconductors, and particularly relates to a quasi-two-dimensional perovskite single crystal, a preparation method of the quasi-two-dimensional perovskite single crystal, a perovskite photoelectric detector and a preparation method of the perovskite photoelectric detector. The preparation method comprises the following steps: mixing aqueous solutions of BO, AX, LAX and HX with a cosolvent according to the metering numbers of LA, A and B in the chemical formula (LA) 2An-1BnX3n + 1 of quasi-two-dimensional perovskite to obtain a mother solution; the mother liquid forms mother liquid drops on the surface of a substrate, the surface layers of the mother liquid drops are subjected to self-assembly, quasi-two-dimensional perovskite single crystals are formed, and the self-assembly time is smaller than or equal to 10 s; and separating the quasi-two-dimensional perovskite single crystal from the mother liquid drops. According to the preparation method, on the basis of ensuring the crystal grain integrity of the quasi-two-dimensional perovskite single crystal, the crystal boundary defect generated when the single crystals are in contact with one another is avoided, and the quasi-two-dimensional perovskite single crystal with good photoelectric property is obtained.

Description

technical field [0001] The invention belongs to the technical field of novel materials and semiconductor preparation, and specifically relates to a quasi-two-dimensional perovskite single crystal and a preparation method thereof, a perovskite photodetector and a preparation method thereof. Background technique [0002] Organic-inorganic perovskite materials have excellent optoelectronic properties and are used in the preparation of high-efficiency solar cells and light-emitting diodes. Organic-inorganic perovskites have high carrier mobility, long lifetime and diffusion distance, and are also an ideal photodetector material. The photoelectric conversion efficiency of organic-inorganic hybrid three-dimensional perovskite materials has exceeded 25%, but the material's inherent instability to moisture, light, and heat is still an important obstacle limiting its practical application. In contrast, emerging 2D / quasi-2D perovskites have attracted increasing attention due to their...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/54C30B9/12C30B29/64H01L51/00H01L51/42H10K99/00
CPCC30B29/54C30B29/64C30B9/12H10K85/00H10K30/00Y02E10/549
Inventor 邱锋刘子睿刘光胜田一胡涛丁家芬张博磊白旋刘青张蕊陈鹏张天明李思李金平张兴
Owner YUNNAN UNIV