Halogen perovskite single crystal x-ray detector and preparation method thereof

Abstract

The invention relates to a halogen perovskite single crystal X-ray detector, which comprises a perovskite single crystal and electrodes arranged oppositely on both sides of the perovskite single crystal, and the molecular formula of the perovskite single crystal is Cs (1‑x) Rb x Pb(Br (1‑y) I y ) 3 , where 0≤x≤0.1, 0≤y≤0.3. Compared with the prior art, the preparation process of the all-inorganic halogen perovskite single crystal of the present invention is simpler and the cost is lower. Compared with polycrystalline perovskite thin films, the perovskite single crystal used in the present invention has the advantages of higher carrier mobility, longer carrier life, better stability, etc., thus making the X-ray detector performance better excellent.

Description

technical field

[0001] The invention belongs to the field of X-ray detectors, in particular to a halogen perovskite single crystal X-ray detector and a preparation method thereof. Background technique

[0002] X-ray detectors have high application value in the fields of medical inspection, industrial non-destructive testing and safety inspection. At present, the commonly used X-ray detectors are classified according to their conversion methods of converting high-energy X-ray photons into charge carriers: one is an indirect X-ray detector, and the other is a direct X-ray detector. Indirect X-ray detectors use scintillator materials to first convert high-energy radiation into visible light, and then use traditional photodetectors based on Si materials to detect visible light indirectly to obtain radiation-related signals, with fast response time, low detection dose, etc. However, due to the light loss and light scattering in the light conversion process of the scintillator ma...

Examples

Embodiment 1

[0067] This embodiment provides a method for preparing an X-ray detector based on an all-inorganic halide perovskite single crystal, and the specific steps are as follows:

[0068] (1) Preparation of all-inorganic perovskite single crystal

[0069] CsBr, RbBr and PbBr in a molar ratio of 0.99:0.01:1 2 Dissolve in DMSO (dimethyl sulfoxide), mix and stir at 50°C for 10 hours until the material is completely dissolved, filter the solution twice with PVDF (polyvinylidene fluoride) filter until it is transparent and clear to obtain clear Cs 0.99 Rb 0.01 PbBr 3 The solution was slowly heated up in an oil bath at 70-115°C until a single crystal nucleus was formed, and the crystal nucleus was removed.

[0070] Move the resulting nuclei into new clarified Cs 0.99 Rb 0.01 PbBr 3 In the solution, the oil bath is heated and kept at 80-105° C. to continue the growth until the crystal grows to a rectangular body with a side length of 0.5-1 cm. The new clarified Cs 0.99 Rb 0.01 PbBr...

Embodiment 2

[0075] In this example, on the basis of Example 1, the raw materials CsBr, RbBr and PbBr for preparing single crystals will be 2 The molar ratio was changed to 0.9:0.1:1, and the obtained perovskite single crystal was Cs (1-x) Rb x PbBr 3 , x=0.1. The rest of the steps are the same as in Example 1.

Embodiment 3

[0077] In this example, on the basis of Example 1, RbBr is removed from the raw material for preparing single crystal, and only CsBr and PbBr are dissolved in DMSO 2 , the molar ratio is 1:1, and the prepared perovskite single crystal is Cs (1-x) Rb x PbBr 3 , x=0. The rest of the steps are the same as in Example 1.

technical field

[0001] The invention belongs to the field of X-ray detectors, in particular to a halogen perovskite single crystal X-ray detector and a preparation method thereof. Background technique

[0002] X-ray detectors have high application value in the fields of medical inspection, industrial non-destructive testing and safety inspection. At present, the commonly used X-ray detectors are classified according to their conversion methods of converting high-energy X-ray photons into charge carriers: one is an indirect X-ray detector, and the other is a direct X-ray detector. Indirect X-ray detectors use scintillator materials to first convert high-energy radiation into visible light, and then use traditional photodetectors based on Si materials to detect visible light indirectly to obtain radiation-related signals, with fast response time, low detection dose, etc. However, due to the light loss and light scattering in the light conversion process of the scintillator ma...

Examples

Embodiment 1

[0067] This embodiment provides a method for preparing an X-ray detector based on an all-inorganic halide perovskite single crystal, and the specific steps are as follows:

[0068] (1) Preparation of all-inorganic perovskite single crystal

[0069] CsBr, RbBr and PbBr in a molar ratio of 0.99:0.01:1 2 Dissolve in DMSO (dimethyl sulfoxide), mix and stir at 50°C for 10 hours until the material is completely dissolved, filter the solution twice with PVDF (polyvinylidene fluoride) filter until it is transparent and clear to obtain clear Cs 0.99 Rb 0.01 PbBr 3 The solution was slowly heated up in an oil bath at 70-115°C until a single crystal nucleus was formed, and the crystal nucleus was removed.

[0070] Move the resulting nuclei into new clarified Cs 0.99 Rb 0.01 PbBr 3 In the solution, the oil bath is heated and kept at 80-105° C. to continue the growth until the crystal grows to a rectangular body with a side length of 0.5-1 cm. The new clarified Cs 0.99 Rb 0.01 PbBr...

Embodiment 2

[0075] In this example, on the basis of Example 1, the raw materials CsBr, RbBr and PbBr for preparing single crystals will be 2 The molar ratio was changed to 0.9:0.1:1, and the obtained perovskite single crystal was Cs (1-x) Rb x PbBr 3 , x=0.1. The rest of the steps are the same as in Example 1.

Embodiment 3

[0077] In this example, on the basis of Example 1, RbBr is removed from the raw material for preparing single crystal, and only CsBr and PbBr are dissolved in DMSO 2 , the molar ratio is 1:1, and the prepared perovskite single crystal is Cs (1-x) Rb x PbBr 3 , x=0. The rest of the steps are the same as in Example 1.

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