High-efficiency multi-energy X-ray detector structure

Abstract

The utility model discloses a high-efficiency multi-energy X-ray detector structure, which comprises a cathode electrode, at least three layers of perovskite wafers and an anode electrode, the at least three layers of perovskite wafers are laminated on the cathode electrode, and the anode electrode is positioned on the at least three layers of perovskite wafers; and two adjacent layers of perovskite wafers form a halogen gradient heterojunction. The perovskite wafers are used as active layers of the X-ray detector, high-energy X-ray energy can be fully absorbed and deposited by using the thicker perovskite wafers, and the X-ray photon detection efficiency of the detector is improved; meanwhile, two adjacent layers of perovskite wafers can form a halogen gradient heterojunction, and as the penetration depths of X-rays with different energies are different and the density gradient of each layer of the gradient heterojunction is changed, X-ray photons with different energies are ensured to be deposited in different layers.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal halide perovskite material and optoelectronic device field, concretely relates to a kind of high-efficiency multi-energy X-ray detector structure. BACKGROUND

[0002] X-ray detection is widely used in medical imaging, security check, radioactive detection, industrial flaw detection, etc. To improve the detection ability of X-rays on objects, dual-energy or multi-energy X-ray detection is proposed to obtain two or more groups of signals of high and low energy X-rays, and through subtraction or other mathematical processing of multiple signals, subtraction imaging is realized. Considering the importance and high difficulty of this detection method, it is a rapidly developing new X-ray detection technology. This detector is beneficial to distinguish different density materials, enhance the imaging contrast between organic and inorganic materials, and identify softer materials (rubber, plastic and tissue). In addition, dual-energy or multi-energy X-ray discrimination can also use digital subtraction to extract images of different tissues at the same position, such as subtracting bone to show the lungs of the chest.

[0003] Currently, dual-energy X-ray detection can be achieved by changing the energy of incident X-rays twice in succession. High-energy X-rays can be used to detect high-density materials such as metals and bones, while low-energy X-rays can be used to detect low-density materials such as plastics and blood vessels. However, this method has some obvious disadvantages: due to the need for two X-ray exposure imaging at different times, the time difference in imaging leads to changes in heart and respiratory motion and contrast agent concentration, and the low-energy and high-energy images cannot be completely time overlapped, resulting in subtraction errors. In addition, when multiple X-ray exposures are performed, the patient's X-ray absorption dose inevitably increases. In addition, the high voltage of the anode of the fast-switching X-ray source has high technical difficulty, so this method is difficult to extend to multi-energy X-ray detection

[0004] In summary, although the existing dual-energy or multi-energy X-ray detection technology has some technical problems, it cannot fully meet the requirements of imaging quality and low absorption dose. UTILITY MODEL CONTENT

[0005] The utility model discloses a kind of high-efficiency multi-energy X-ray detector structures.

[0006] The utility model discloses the technical scheme that is adopted:

[0007] A kind of high-efficiency multi-energy X-ray detector structure, including cathode electrode, at least 3 layers of perovskite wafer and anode electrode, wherein the at least 3 layers of perovskite wafer are stacked on the cathode electrode, and the anode electrode is located on the at least 3 layers of perovskite wafer;

[0008] The perovskite wafer of the adjacent two layers forms a halogen gradient heterojunction.

[0009] Further, the perovskite wafer is three layers, which are MAPbCl3, MAPbBr3 and MAPbI3 respectively.

[0010] Further, the material of the cathode electrode is gold, silver, platinum, titanium, aluminum, copper, ITO or IZO.

[0011] Further, the thickness of the cathode electrode is 50-500 nm.

[0012] Further, the material of the anode electrode is gold, silver, platinum, titanium, aluminum, copper, ITO or IZO.

[0013] Further, the thickness of the anode electrode is 50-500 nm.

[0014] Further, the diameter of the perovskite wafer is 1-15 cm, and the thickness is 0.1-5 mm.

[0015] The perovskite wafer can be prepared by a solution method to prepare perovskite microcrystal powder with different halogens, and then the powder cold pressing method is used for stacking in sequence; the perovskite wafer is hot-pressed to prepare a perovskite heterojunction wafer, and a cathode strip electrode and an anode strip electrode array are prepared on the opposite two surfaces of the side surface of the perovskite heterojunction wafer.

[0016] Advantages:

[0017] (1) The perovskite wafer of the adjacent two layers can form a halogen gradient heterojunction, because the penetration depth of different energy X-rays is different and the density gradient of each layer of the gradient heterojunction changes, so that the X-ray photons of different energies are deposited in different layers.

[0018] (2) The high-efficiency multi-energy X-ray detector structure can realize energy resolution only by once X-ray irradiation, compared with the traditional method, the number of X-ray irradiation is reduced, and the damage of excessive X-ray irradiation to the human body is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a high-efficiency multi-energy X-ray detector structure schematic diagram of the utility model. DETAILED DESCRIPTION

[0020] The utility model will be further explained in connection with the drawings and specific implementation:

[0021] As Figure 1As shown, a high-efficiency multi-energy X-ray detector structure comprises a cathode electrode, at least three perovskite wafers and an anode electrode, wherein the at least three perovskite wafer layers are stacked on the cathode electrode, and the anode electrode is located on the at least three perovskite wafer layers; the perovskite wafers of two adjacent layers form a halogen gradient heterojunction.

[0022] The perovskite wafers are three layers, namely MAPbCl3, MAPbBr3 and MAPbI3. The material of the cathode electrode is gold, silver, platinum, titanium, aluminum, copper, ITO or IZO. The thickness of the cathode electrode is 50-500 nm. The material of the anode electrode is gold, silver, platinum, titanium, aluminum, copper, ITO or IZO. The thickness of the anode electrode is 50-500 nm. The diameter of the perovskite wafer is 1-15 cm, and the thickness is 0.1-5 mm.

[0023] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high efficiency multi-energy X-ray detector structure, characterized by: The device comprises a cathode electrode, at least 3 layers of perovskite wafers and an anode electrode, wherein the at least 3 layers of perovskite wafers are stacked on the cathode electrode, and the anode electrode is located on the at least 3 layers of perovskite wafers. The perovskite wafers of two adjacent layers form a halogen gradient heterojunction.

2. A high efficiency multi-energy X-ray detector structure according to claim 1, characterized in that: The perovskite wafers are three layers, which are MAPbCl3, MAPbBr3 and MAPbI3 respectively.

3. The high efficiency multi-energy X-ray detector structure of claim 1, wherein: The material of the cathode electrode is gold, silver, platinum, titanium, aluminum, copper, ITO or IZO.

4. The high efficiency multi-energy X-ray detector structure of claim 1, wherein: The thickness of the cathode electrode is 50-500 nm.

5. The high efficiency multi-energy X-ray detector structure of claim 1, wherein: The material of the anode electrode is gold, silver, platinum, titanium, aluminum, copper, ITO or IZO.

6. The high efficiency multi-energy X-ray detector structure of claim 1, wherein: The thickness of the anode electrode is 50-500 nm.

7. The high efficiency multi-energy X-ray detector structure of claim 1, wherein: The diameter of the perovskite wafer is 1-15 cm, and the thickness is 0.1-5 mm.

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