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A kind of X-ray detector based on perovskite single crystal particle composite film and its preparation method

A technology of ray detectors and single crystal particles, which is applied in the field of X-ray detectors based on perovskite single crystal particle composite films and its preparation, can solve the problem of large dark current, low sensitivity, and slow response of X-ray detectors. problems, to achieve good application prospects, fast response, low dark current and low noise

Active Publication Date: 2021-11-23
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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  • A kind of X-ray detector based on perovskite single crystal particle composite film and its preparation method
  • A kind of X-ray detector based on perovskite single crystal particle composite film and its preparation method
  • A kind of X-ray detector based on perovskite single crystal particle composite film and its preparation method

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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 includes a hole transport layer, a perovskite single crystal particle composite film, an electron transport layer, an interface modification layer and an electrode, wherein the perovskite single crystal particle composite film is a perovskite single crystal and polyalcohol or The polymer composite film has a film thickness of 30-200 μm, and the perovskite single crystal is methylamine lead bromide salt perovskite single crystal. Its preparation is as follows: prepare methylamine lead bromide salt perovskite single crystal, uniformly disperse in polyols or polymer solution after crushing and sieving, then spin-coat on the hole transport layer or electron transport layer, and prepare after annealing A perovskite single crystal particle composite film is obtained; an electron transport layer or a hole transport layer, an interface modification layer and an electrode are deposited on the surface of the obtained composite film to obtain an X-ray detector based on a perovskite single crystal particle composite film. The preparation is simple, a lower dose rate can be detected, the sensitivity is high, the response is fast, and the charge transport performance is excellent.

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 Patents(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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