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Methylamino metal halide perovskite single crystal with preferred orientation for large-size high-quality radiation detector and preparation method of methylamino metal halide perovskite single crystal

A halide perovskite and radiation detector technology, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of restricting large-scale industrial production, and achieve crystal quality improvement, low cost, and growth speed-up effect

Active Publication Date: 2022-07-05
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, high-purity germanium materials need to work in a low-temperature environment cooled by liquid nitrogen due to their low band gap; II-VI compound semiconductor materials (CdZnTe, etc.) can work well in room temperature environments, but high cost and charge load Problems such as flow traps limit its large-scale industrial production

Method used

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  • Methylamino metal halide perovskite single crystal with preferred orientation for large-size high-quality radiation detector and preparation method of methylamino metal halide perovskite single crystal
  • Methylamino metal halide perovskite single crystal with preferred orientation for large-size high-quality radiation detector and preparation method of methylamino metal halide perovskite single crystal
  • Methylamino metal halide perovskite single crystal with preferred orientation for large-size high-quality radiation detector and preparation method of methylamino metal halide perovskite single crystal

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Experimental program
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Effect test

Embodiment 1

[0057] Embodiment 1 A methylamine-based metal halide perovskite single crystal with preferred orientation for large-scale and high-quality radiation detectors and its preparation method

[0058] A method for preparing a methylamine-based metal halide perovskite single crystal for a large-size and high-quality radiation detector with a preferred orientation provided in this embodiment is performed in the following order of steps:

[0059] (1) Weigh out CH with a purity of 99.5% 3 NH 3 Cl powder and 99.99% pure PbCl 2 Powder (the molar ratio of the two is 1:1), mix well to get mixed powder;

[0060] (2) Dissolve the mixed powder in a mixed solution of dimethyl sulfoxide and dimethylformamide with a volume ratio of 1:1, heat and stir on a magnetic heating stirrer at 40° C. and 700 rpm / min until the solution is After clarification, keep stirring for 2 hours to obtain a precursor solution with a molar concentration of 0.8 mol / L;

[0061] (3) Use a 10 mL disposable syringe and a...

Embodiment 2-4

[0078] Example 2-4 Methylamine-based metal halide perovskite single crystal for large-size and high-quality radiation detectors and its preparation method

[0079] This embodiment is respectively a methylamine-based metal halide perovskite single crystal for a large-scale and high-quality radiation detector and a preparation method thereof. The preparation steps are similar to those of embodiment 1, and the difference is only in the corresponding technical parameters in the preparation process. different, see the table below:

[0080]

Embodiment 5

[0081] Example 5 Comparative Example

[0082] Group A: Crystallization of methylamine-based metal halide perovskite CH 3 NH 3 PbCl 3 single crystal

[0083] Weigh the initial raw material CH in a molar ratio of 1:1 3 NH 3 Cl and PbCl 2 powder, mix well and set aside; mix CH 3 NH 3 Cl and PbCl 2 The mixed powder is dissolved in a mixed solution of dimethylformamide and dimethyl sulfoxide (the molar concentration is 0.8 mol / L) with a volume ratio of 1:1, and a magnetic stirrer is added to the solution, and the mixture is heated on a magnetic heating stirrer. Heating and stirring at 40 °C to fully dissolve the solute in the solution. After the solution is clear, continue to keep stirring for 2 hours at a stirring rate of 700 rpm / min; use a 10 mL disposable syringe and an organic filter head with a pore size of 0.22 μm to filter the above solution. , to remove impurity particles and avoid uneven nucleation of impurities, place the filtered solution in a flat-bottomed beak...

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Abstract

The invention discloses a methylamino metal halide perovskite single crystal with preferred orientation and used for a large-size high-quality radiation detector and a preparation method of the methylamino metal halide perovskite single crystal, the chemical formula of the methylamino metal halide perovskite single crystal is CH3NH3PbCl3, a high-quality seed crystal is introduced in the crystal preparation process, the CH3NH3PbCl3 single crystal is prepared through the seed crystal by adopting an inverse temperature difference crystallization method in the preparation process, the method is simple in process, the yield is high, and the yield is high. According to the present invention, the crystal growth temperature is low, the process is controllable, the crystal quality is high, the single crystal size can achieve the centimeter level, and the single crystal has characteristics of high preferred orientation, good photoelectric property, large forbidden bandwidth and good radiation resistance, can well meet the application requirements of the radiation detector, and has advantages in the strong radiation field environment.

Description

technical field [0001] The invention belongs to the technical field of semiconductor materials and crystals, relates to a perovskite single crystal and a preparation method thereof, and in particular relates to a methylamine-based metal halide perovskite single crystal for large-size and high-quality radiation detectors with preferred orientation and its preparation method. Background technique [0002] Methylamine-based metal halide perovskite CH 3 NH 3 PbX 3 (X=Cl, Br, I), as a new type of direct band gap semiconductor material, has excellent optoelectronic properties such as high atomic defect tolerance, large light absorption coefficient, long carrier diffusion length, and adjustable band gap. Widely used in solar cells, light emitting diodes (LEDs), detectors, lasers, field effect transistors and other fields. Two classes of perovskite materials most commonly used in radiation detection applications are polycrystalline thin films and single crystals. Compared with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/54C30B7/14H01L51/46
CPCC30B29/54C30B7/14H10K85/60Y02P70/50Y02E10/549
Inventor 南瑞华武春燕王恒张曦靳长清坚增运
Owner XIAN TECHNOLOGICAL UNIV
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