X-ray detector based on perovskite single crystal particle composite film and preparation method thereof

A ray detector and single crystal particle technology, applied in the field of X-ray detector based on perovskite single crystal particle composite film and its preparation, can solve the problem of slow response, large dark current of X-ray detector, low sensitivity, etc. problem, to achieve the effect of low dark current and noise, good application prospect and fast response

Active Publication Date: 2020-03-24
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the X-ray detectors based on perovskite materials prepared by the existing technology generally have a large dark current and a slow response, which limits the minimum X-ray dose rate that can be detected, and the sensitivity is also low.

Method used

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  • X-ray detector based on perovskite single crystal particle composite film and preparation method thereof
  • X-ray detector based on perovskite single crystal particle composite film and preparation method thereof
  • X-ray detector based on perovskite single crystal particle composite film and preparation method thereof

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Effect test

Embodiment 1

[0039] A preparation method based on perovskite single crystal particle composite film X-ray detector, comprising the following steps:

[0040] 1) Methylamine lead bromide salt (CH 3 NH 3 PbBr 3 ) perovskite single crystal, the solution of methylamine lead bromide salt was fully dissolved at 40°C to obtain a saturated solution, and after filtration, it was continuously heated at 100°C for 12 hours to grow a single crystal of methylamine lead bromide salt perovskite. The single crystal particle size of granular perovskite is 1.5cm;

[0041] 2) After drying the methylamine lead bromide perovskite single crystal described in step 1), perform mechanical crushing and sieving to obtain methylamine lead bromide perovskite single crystal particles, and dry it in a vacuum oven at 60°C for 24 Hours, crushing using a ball mill, sieving using a vibrating sieve, and the particle size of the single crystal particles obtained after crushing and sieving is 30-40 μm;

[0042]3) The mixed s...

Embodiment 2

[0056] A preparation method based on perovskite single crystal particle composite film X-ray detector, comprising the following steps:

[0057] 1) Methylamine lead bromide (CH 3 NH 3 PbBr 3 ) perovskite single crystal, fully dissolve the solution of methylamine lead bromide salt at 40°C to obtain a saturated solution, filter and continue heating at 70°C for 12 hours to slowly evaporate the solvent to obtain methylamine lead bromide salt perovskite single crystal , in which the single crystal grain size of large-grained perovskite is 0.5cm;

[0058] 2) After drying the methylamine lead bromide perovskite single crystal described in step 1), perform mechanical crushing and sieving to obtain methylamine lead bromide perovskite single crystal particles, and dry it in a vacuum oven at 60°C for 24 Hours, crushing using a ball mill, sieving using a vibrating sieve, and the particle size of the single crystal particles obtained after crushing and sieving is 40-50 μm;

[0059] 3) T...

Embodiment 3

[0066] A preparation method based on perovskite single crystal particle composite film X-ray detector, comprising the following steps:

[0067] 1) Methylamine lead bromide salt (CH 3 NH 3 PbBr 3 ) perovskite single crystal, the solution of methylamine lead bromide salt was fully dissolved at 40°C to obtain a saturated solution, and after filtration, it was continuously heated at 120°C for 14 hours to grow a single crystal of methylamine lead bromide salt perovskite. The single crystal particle size of granular perovskite is 1cm;

[0068] 2) After drying the methylamine lead bromide perovskite single crystal described in step 1), perform mechanical crushing and sieving to obtain methylamine lead bromide perovskite single crystal particles, and dry it in a vacuum oven at 60°C for 24 Hours, crushing using a ball mill, sieving using a vibrating sieve, and the particle size of the single crystal particles obtained after crushing and sieving is 40-50 μm;

[0069] 3) The mixed su...

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Abstract

The invention relates to an X-ray detector based on a perovskite single crystal particle composite film and a preparation method thereof. The X-ray detector comprises a hole transport layer, a perovskite single crystal particle composite film, an electron transport layer, an interface modification layer and an electrode. The perovskite single crystal particle composite film is a composite film ofperovskite single crystals and polyols or polymers, the film thickness is 30-200 [mu]m, and the perovskite single crystals are methylamine lead bromide perovskite single crystals. The preparation method comprises the following steps: preparing methylamine lead bromide perovskite single crystals, crushing, screening, uniformly dispersing in a polyol or polymer solution, spin-coating on a hole transport layer or an electron transport layer, and annealing to obtain a perovskite single crystal particle composite film; and depositing an electron transport layer or a hole transport layer, an interface modification layer and an electrode on the surface of the obtained composite film to obtain the X-ray detector based on the perovskite single crystal particle composite film. The detector is simpleto prepare, capable of detecting a relatively low dosage rate, high in sensitivity, quick in response and excellent in charge transmission performance.

Description

technical field [0001] The invention belongs to the field of X-ray thin film devices, in particular to an X-ray detector based on perovskite single crystal particle composite film and a preparation method thereof. Background technique [0002] Organic-inorganic hybrid perovskite materials are widely used in the field of optoelectronics (solar cells, light-emitting diodes) due to their unique properties such as high absorption coefficient, large hole and electron mobility, long diffusion length, adjustable band gap, and convenient processing / integration. , photodetectors, etc.) have received extensive attention. Moreover, X-ray detectors based on perovskite materials are also a promising alternative to current X-ray detector technologies (i.e., direct conversion based on amorphous selenium or indirect conversion based on scintillation crystals) and are applied in high-energy X-ray detectors. - Detection of ionizing radiation such as ray or gamma rays. Like the detection of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/12H10K71/40H10K85/30H10K30/15Y02E10/549
Inventor 林乾乾彭家丽
Owner WUHAN UNIV
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