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Halide perovskite single crystal, preparation method and application of halogenated perovskite single crystal in preparation of X-ray detector

A calcium halide and detector technology, applied in the field of X-ray detection, can solve the problem of lack of practical application and development of perovskite X-ray detectors

Active Publication Date: 2020-09-11
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few research reports in the field of X-ray detection, and some exploration is needed to improve the performance of X-ray detectors by using defect state passivation.
Perovskite single crystal devices are developing rapidly in the field of X-ray detection, but there is still a lack of practical application development of perovskite X-ray detectors

Method used

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  • Halide perovskite single crystal, preparation method and application of halogenated perovskite single crystal in preparation of X-ray detector
  • Halide perovskite single crystal, preparation method and application of halogenated perovskite single crystal in preparation of X-ray detector
  • Halide perovskite single crystal, preparation method and application of halogenated perovskite single crystal in preparation of X-ray detector

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Embodiment 1

[0074] Present embodiment provides the control solvent volatilization method growth methylamine lead bromide (MAPbBr 3 ) single crystal, oxygen atom surface passivation treatment, X-ray detector production and practical application development, the specific steps are as follows:

[0075] (a) Weigh the molar ratio of PbBr 2 : MABr≈1:1 (PbBr 2 is 18.3505g, MABr is 5.5985g) and the raw materials are dropped into 50mL DMF solvent successively.

[0076] (b) The above solution was magnetically stirred at 34° C. for 12 h, then allowed to stand for 1 h, and then filtered with a 0.45 micron organic filter to obtain a clear solution.

[0077] (c) Set the temperature of the heating platform to 34°C, and place a glass water tank filled with silicone oil on the heating platform. Take 30mL of the clear solution obtained by filtration and put it in a 50mL beaker, put the beaker in the water tank, cover most of the beaker with a glass piece 2 Open area, constant temperature heating.

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Abstract

The invention discloses a halide perovskite single crystal, a preparation method and application of the single crystal in preparation of an X-ray detector, and belongs to the technical field of X-raydetectors. The invention develops a method for controlling the growth of halide perovskite single crystals through solvent evaporation, the growth rate of the crystals is constant mainly by regulatingand controlling the growth temperature, the opening area of a solution and other factors, and the perovskite single crystals with lower crystal defect state density and higher carrier mobility-carrier lifetime deposition are grown. Polyoxyethylene is used for passivating surface defects of the perovskite single crystal, so that the crystal surface defects and surface leakage current are remarkably reduced, and the crystal has higher resistivity and lower noise current signals. The sensitivity of the prepared X-ray detector under 120 keV hard rays reaches 1274 [mu] C.Gyair.cm <2>, the lowest detection amount is as low as 0.56 [mu] Gyair.s <-1>, the requirements of medical imaging application are met, and the X-ray detector can be applied to metal material component analysis and flaw detection.

Description

technical field [0001] The invention belongs to the technical field of X-ray detection, and in particular relates to a halide perovskite single crystal, a method for preparing it by controlling solvent volatilization and growth, and an application of the single crystal in preparing an X-ray detector. Background technique [0002] Because X-rays have strong penetrating ability and can detect information inside objects without damage, they are widely used in medical imaging, safety inspection, transportation container inspection, material quality inspection and scientific research. For X-ray detectors, high sensitivity at low X-ray doses can be widely used in various fields. Sensitivity and minimum detection dose are one of its most important parameters. [0003] In recent years, perovskite materials have been regarded as a new generation X due to their excellent performance in the field of radiation detection due to their low defect state density, large carrier mobility, carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B7/06G01N23/04
CPCC30B7/06C30B29/12G01N23/04
Inventor 魏浩桐李维俊杨柏
Owner JILIN UNIV
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