A test device for carrier mobility of insulating polymer

Abstract

The present invention relates to the technical field of electrical performance testing of insulating polymer materials, and discloses an insulating polymer carrier mobility testing device, which includes a first box, a second box, a sample holder, an X-ray source, a voltage generating component, and a current detecting component; the second box is arranged inside the first box, a partition plate is arranged inside the second box, and a first space and a second space are formed in the second box by the partition plate; the sample holder is used to fix the sample, and the sample holder is arranged in the first space; the X-ray source is arranged in the second space, and is used to generate and emit X-rays to irradiate the sample to stimulate the generation of carriers inside the sample; the voltage generating component is connected to the sample line to apply a triangular wave voltage to both ends of the sample to move the carriers generated inside the sample; the current detecting component is connected to the sample to collect the current signal generated by the sample due to the movement of the carriers. The present invention can accurately measure the mobility value of low-mobility insulating polymer materials.

Description

Technical Field

[0001] The invention relates to the technical field of electrical performance testing of insulating polymer materials, and in particular to a device for testing the carrier mobility of insulating polymers. Background Art

[0002] Insulating polymer materials have a wide range of applications and importance in modern science and industry. These materials are widely used in electrical and electronic equipment, such as cable insulation, capacitor dielectrics, printed circuit boards (PCBs), and electronic packaging materials, due to their excellent insulation properties, high voltage resistance, chemical corrosion resistance, and mechanical strength. In the power system, insulating polymer materials are used for the insulation of cables, transformers, and switchgear to ensure the safe transmission of electricity and the long-term stable operation of equipment. In addition, with the miniaturization and increased integration of electronic devices, insulating polymer materials also play a key role in microelectronic devices, semiconductor packaging, and flexible electronic products. Its advantages in environmental friendliness and processability make it an important basic material for the development of future green electronics and smart grid technologies.

[0003] The carriers of insulating polymer materials refer to the charge carriers that can move freely in the insulating polymer materials, mainly including electrons and holes. The mobility of carriers, that is, mobility, is one of the key parameters that determine the electrical properties of insulating polymer materials. Carrier mobility directly affects the insulation properties of the material and is an important indicator for evaluating material performance.

[0004] However, the current carrier mobility measurement methods are all for semiconductor materials, because semiconductors have high carrier mobility and are easy to detect. For insulating polymer materials with low mobility, there is currently no mature carrier mobility detection device. Therefore, it is necessary to design an insulating material polymer carrier mobility detection device to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide an insulating polymer carrier mobility testing device, aiming to solve the problems of low testing accuracy, complex system and limited application scope.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An insulating polymer carrier mobility testing device, comprising:

[0008] The first box;

[0009] a second box, the second box being arranged inside the first box, a partition plate being arranged inside the second box, and a first space and a second space being formed inside the second box by the partition plate;

[0010] A sample holder, the sample holder is used to fix the sample, and the sample holder is arranged in the first space;

[0011] An X-ray source, which is disposed in the second space and is used to generate and emit X-rays to irradiate the sample, so as to stimulate the generation of carriers inside the sample;

[0012] A voltage generating component, the voltage generating component is connected to the sample line to apply a triangular wave voltage to both ends of the sample to move the carriers generated inside the sample;

[0013] The current detection component is connected to the sample to collect the current signal generated by the sample due to the movement of carriers.

[0014] Furthermore, the first box body includes a first side wall, a first top plate and a first bottom plate, the first top plate and the first bottom plate are arranged at the upper and lower ends of the first side wall, the first side wall, the first top plate and the first bottom plate are all a first sandwich structure, and the first sandwich structure includes a first steel plate, a first lead plate and a second steel plate connected in sequence.

[0015] Furthermore, the first box is in the shape of a hollow cylinder with a diameter of 35 to 45 cm and a height of 50 to 70 cm.

[0016] Furthermore, the thickness of the first sandwich structure is 1.2 cm, wherein the thickness of the first steel plate and the second steel plate is 1 mm, and the thickness of the first lead plate is 10 mm.

[0017] Furthermore, the second box body includes a second side wall, a second top plate and a second bottom plate, the second top plate and the second bottom plate are arranged at the upper and lower ends of the second side wall, the second side wall, the second top plate and the second bottom plate are all a second sandwich structure, and the second sandwich structure includes a third steel plate, a second lead plate and a fourth steel plate connected in sequence.

[0018] Furthermore, the second box is in the shape of a hollow cylinder with a diameter of 25 to 35 cm and a height of 30 to 60 cm.

[0019] Furthermore, the thickness of the second sandwich structure is 1.2 cm, wherein the thickness of the third steel plate and the fourth steel plate is 1 mm, and the thickness of the second lead plate is 10 mm.

[0020] Furthermore, the partition plate is a lead plate.

[0021] Furthermore, it also includes an X-ray excitation power supply, which includes a DC power supply, a self-excited oscillation circuit and a capacitor series voltage doubler circuit; wherein the output end of the DC power supply is connected to the input end of the self-excited oscillation circuit, the output end of the self-excited oscillation circuit is connected to the input end of the capacitor series voltage doubler circuit, and the output end of the capacitor series voltage doubler circuit is connected to the input end of the X-ray source.

[0022] Furthermore, it also includes a data processing unit, which is connected to the current detection component signal to calculate the carrier mobility of the sample according to the current signal fed by the current detection component.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention uses X-rays to stimulate carrier movement and applies a triangular wave voltage to the insulating material, thereby effectively measuring the carrier mobility of the insulating polymer material by measuring the induced current.

[0025] 2. The present invention uses X-ray excitation, which can effectively excite the carriers inside the insulating material. Compared with the traditional light excitation method, X-ray excitation has higher penetration and excitation efficiency, can excite the carriers more evenly, and reduce the influence of the sample surface and thickness on the test results.

[0026] 3. By applying a triangular wave voltage and measuring the induced current, the present invention can accurately detect the movement of carriers. The highly sensitive current sensor and high-speed data acquisition device ensure the accurate capture of weak current signals, significantly improving the sensitivity and accuracy of the test.

[0027] 4. Compared with the traditional time-resolved photoconductivity method and field effect mobility measurement method, the present invention does not require a complex optical system and high-precision voltage control equipment, simplifies the system design, and reduces the test cost. The present invention is applicable to various types of insulating polymer materials, including low-mobility and high-mobility samples, and can meet the test requirements of different materials.

[0028] In summary, the present invention effectively solves the problems of low test accuracy, complex system, limited application scope, etc. in the prior art, and provides an efficient, accurate and widely applicable insulating polymer material carrier mobility test solution. This technical solution not only has important scientific research value, but also has broad prospects in practical applications, which is helpful to promote the research and development of insulating polymer materials and related electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A structural diagram of an insulating polymer carrier mobility testing device according to an embodiment of the present invention is shown.

[0030] Figure 2 A cross-sectional view of a first box and a second box in an insulating polymer carrier mobility testing device according to an embodiment of the present invention is shown.

[0031] Reference numerals:

[0032] 100, first box; 101, first side wall; 102, first top plate; 103, first bottom plate; 104, first sandwich structure; 1041, first steel plate; 1042, first lead plate; 1043, second steel plate; 200, second box; 201, partition plate; 202, first space; 203, second space; 204, second side wall; 205, second top plate; 206, second bottom plate; 207, second sandwich structure; 2071, third steel plate; 2072, second lead plate; 2073, fourth steel plate; 300, sample holder; 400, X-ray source; 500, voltage generating component; 600, current detecting component; 700, sample; 800, X-ray excitation power supply; 801, DC power supply; 802, self-excited oscillation circuit; 803, capacitor series voltage multiplier circuit; 900, data processing unit. DETAILED DESCRIPTION

[0033] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The specific implementation of the present invention is further described in detail below in conjunction with the drawings and examples.

[0037] See also Figure 1 , which is a structural diagram of an insulating polymer carrier mobility test device. An embodiment of the present invention provides an insulating polymer carrier mobility test device to accurately measure the mobility value of a low-mobility insulating polymer material. The insulating polymer carrier mobility test device includes a first box 100, a second box 200, a sample holder 300, an X-ray source 400, a voltage generating component 500, and a current detecting component 600. The second box 200 is disposed inside the first box 100, and a partition plate 201 is disposed inside the second box 200, and a first space 202 and a second space 203 are formed in the second box 200 by the partition plate 201. The sample holder 300 is used to fix the sample 700, and the sample holder 300 is arranged in the first space 202; the X-ray source 400 is arranged in the second space 203, and is used to generate and emit X-rays to irradiate the sample 700, so as to stimulate the generation of carriers inside the sample; the voltage generating component 500 is connected to the sample 700 line to apply a triangular wave voltage to both ends of the sample 700 to move the carriers generated inside the sample 700; the current detection component 600 is connected to the sample 700 to collect the current signal generated by the sample 700 due to the movement of carriers.

[0038] It should be noted that the sample 700 described in this article is a sample prepared using an insulating polymer material, which is a polymer insulating material, also known as a polymer dielectric, used to isolate charged or different potential conductors so that current can flow in a certain direction. Its volume resistivity is generally greater than 109Ω·cm.

[0039] In this embodiment, the inner and outer box structure composed of the first box 100 and the second box 200 plays a role in preventing the internal X-rays from leaking out and affecting the safety of personnel and the environment. The X-ray source 400 generates X-rays to irradiate the sample to generate carriers in the sample, and cooperates with the triangular wave voltage generated by the voltage generating component 500 to make the carriers inside the sample move, and finally calculates the carrier mobility of the sample according to the current signal generated by the carrier movement collected by the current detection component 600. The device can meet the test requirements of samples with low mobility.

[0040] Among them, the calculation formula of carrier mobility μ is:

[0041]

[0042] Among them, I is the measured current, n is the carrier concentration (a property of the material itself, which can be obtained by looking up a table or theoretical calculation), e is the electron charge, and E is the electric field strength.

[0043] In order to verify that the insulating polymer carrier mobility test device can accurately measure the mobility of low-mobility samples, a cross-linked polyethylene sample was selected for testing, and the thickness of the cross-linked polyethylene sample was 200 μm and the size was 10 cm long × 10 cm wide.

[0044] Using the insulating polymer carrier mobility test device, fix the sample on the sample holder in the device to ensure that the X-ray can irradiate the sample. The X-ray source excitation voltage is set to 160kV, and the excitation time is 1 second. Apply a triangular wave voltage with a voltage amplitude of 20V and a frequency of 2Hz.

[0045] The measured current I is 2×10 -9 A.

[0046] The carrier concentration n of the sample is assumed to be 1×10 15 cm-3.

[0047] The applied electric field strength E is 1×10 5 V / m.

[0048] By calculation, the carrier mobility μ is 2×10 -7 cm 2 / V·s.

[0049] In many experiments, the carrier mobility of cross-linked polyethylene was stabilized at 1.8×10 -7 to 2.2×10 -7 cm 2 / V·s. This value is consistent with the reported mobility data of cross-linked polyethylene materials, verifying the effectiveness and accuracy of the test device.

[0050] In some embodiments, see Figure 2 , is a cross-sectional view of a first box and a second box in an insulating polymer carrier mobility test device, providing a specific structure of the first box 100. The first box 100 includes a first side wall 101, a first top plate 102 and a first bottom plate 103, the first top plate 102 and the first bottom plate 103 are arranged at the upper and lower ends of the first side wall 101, the first side wall 101, the first top plate 102 and the first bottom plate 103 are all first sandwich structures 104, and the first sandwich structure 104 includes a first steel plate 1041, a first lead plate 1042 and a second steel plate 1043 connected in sequence.

[0051] In some embodiments, the first box 100 is a hollow cylinder with a diameter of 35-45 cm and a height of 50-70 cm. The thickness of the first sandwich structure 104 is 1.2 cm, wherein the thickness of the first steel plate 1041 and the second steel plate 1043 is 1 mm, and the thickness of the first lead plate 1042 is 10 mm.

[0052] Exemplarily, the first box body 100 is a hollow cylinder with a diameter of 40 cm and a height of 60 cm. The first side wall 101, the first top plate 102 and the first bottom plate 103 are all 1.2 cm, forming a first sandwich structure. The first sandwich structure includes a first steel plate and a second steel plate with a thickness of 1 mm on the right inside and outside, and a first lead plate with a thickness of 10 mm between the first steel plate and the second steel plate, in order to prevent the internal X-rays from leaking out and affecting the safety of personnel and the environment.

[0053] In some embodiments, a specific structure of the second box 200 is provided. Figure 2 As shown, the second box body 200 includes a second side wall 204, a second top plate 205 and a second bottom plate 206, the second top plate 205 and the second bottom plate 206 are arranged at the upper and lower ends of the second side wall 204, the second side wall 204, the second top plate 205 and the second bottom plate 206 are all a second sandwich structure 207, and the second sandwich structure 207 includes a third steel plate 2071, a second lead plate 2072 and a fourth steel plate 2073 connected in sequence.

[0054] In some embodiments, the second box body 200 is a hollow cylinder with a diameter of 25 to 35 cm and a height of 30 to 60 cm. The thickness of the second sandwich structure 207 is 1.2 cm, wherein the thickness of the third steel plate 2071 and the fourth steel plate 2073 is 1 mm, and the thickness of the second lead plate 2072 is 10 mm.

[0055] Exemplarily, the second box body 200 is a hollow cylinder with a diameter of 30 cm and a height of 50 cm. The second box body is divided into two layers, an upper layer and a lower layer, by a partition plate 201. Each layer is 25 cm high, and a circular hole can be set in the middle of the partition plate 201 to facilitate the passage of X-rays. The thickness of the second side wall 204, the second top plate 205 and the second bottom plate 206 are all 1.2 cm, forming a second sandwich structure. The thickness of the third steel plate 2071 and the fourth steel plate 2073 is 1 mm, and the thickness of the second lead plate 2072 is 10 mm. The purpose is to prevent the internal X-rays from leaking and affecting the safety of personnel and the environment.

[0056] In some embodiments, Figure 1 As shown, the insulating polymer carrier mobility testing device also includes an X-ray excitation power supply 800, and the X-ray excitation power supply 800 includes a DC power supply 801, a self-excited oscillation circuit 802 and a capacitor series voltage doubler circuit 803; wherein, the output end of the DC power supply 801 is connected to the input end of the self-excited oscillation circuit 802, the output end of the self-excited oscillation circuit 802 is connected to the input end of the capacitor series voltage doubler circuit 803, and the output end of the capacitor series voltage doubler circuit 803 is connected to the input end of the X-ray source 400.

[0057] The X-ray excitation power supply 800 is used to provide a pulse high voltage for the X-ray source 400. The pulse high voltage is generated by generating a low voltage DC voltage (1-200V) through a DC power supply 801, which is then connected to a self-excited oscillation circuit 802 to generate a pulse high voltage (800V-10kV), and the voltage is further increased through a voltage doubling circuit 803 to generate a pulse high voltage (100-200kV) that can drive the X-ray source 400.

[0058] In some embodiments, Figure 1 As shown, the insulating polymer carrier mobility testing device further includes a data processing unit 900 , which is signal-connected to the current detection component 600 to calculate the carrier mobility of the sample according to the current signal fed by the current detection component 600 .

[0059] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A method for testing the carrier mobility of an insulating polymer, characterized in that: Based on an insulating polymer carrier mobility test device, the insulating polymer carrier mobility test device comprises: The first box; a second box, the second box being arranged inside the first box, a partition plate being arranged inside the second box, and a first space and a second space being formed inside the second box by the partition plate; A sample holder, the sample holder is used to fix the sample, and the sample holder is arranged in the first space; An X-ray source, which is disposed in the second space and is used to generate and emit X-rays to irradiate the sample, so as to stimulate the generation of carriers inside the sample; A voltage generating component, the voltage generating component is connected to the sample line to apply a triangular wave voltage to both ends of the sample to move the carriers generated inside the sample; A current detection component connected to the sample to collect a current signal generated by the sample due to carrier movement; The method comprises: An X-ray source is used to generate X-rays to irradiate the sample to generate carriers in the sample, and X-rays are used to stimulate the carriers to move. A triangular wave voltage is applied to the insulating material, and the induced current is measured to effectively measure the carrier mobility of the insulating polymer material.

2. The method for testing the carrier mobility of insulating polymers according to claim 1, characterized in that: The first box body includes a first side wall, a first top plate and a first bottom plate, the first top plate and the first bottom plate are arranged at the upper and lower ends of the first side wall, the first side wall, the first top plate and the first bottom plate are all a first sandwich structure, and the first sandwich structure includes a first steel plate, a first lead plate and a second steel plate connected in sequence.

3. The method for testing the carrier mobility of insulating polymers according to claim 2, characterized in that: The first box is in the shape of a hollow cylinder with a diameter of 35 to 45 cm and a height of 50 to 70 cm.

4. The method for testing the carrier mobility of insulating polymers according to claim 2, characterized in that: The thickness of the first sandwich structure is 1.2 cm, wherein the thickness of the first steel plate and the second steel plate is 1 mm, and the thickness of the first lead plate is 10 mm.

5. The method for testing the carrier mobility of insulating polymers according to claim 1, characterized in that: The second box body includes a second side wall, a second top plate and a second bottom plate, the second top plate and the second bottom plate are arranged at the upper and lower ends of the second side wall, the second side wall, the second top plate and the second bottom plate are all a second sandwich structure, and the second sandwich structure includes a third steel plate, a second lead plate and a fourth steel plate connected in sequence.

6. The method for testing the carrier mobility of insulating polymers according to claim 5, characterized in that: The second box is in the shape of a hollow cylinder with a diameter of 25 to 35 cm and a height of 30 to 60 cm.

7. The method for testing the carrier mobility of insulating polymers according to claim 5, characterized in that: The thickness of the second sandwich structure is 1.2 cm, wherein the thickness of the third steel plate and the fourth steel plate is 1 mm, and the thickness of the second lead plate is 10 mm.

8. The method for testing carrier mobility of insulating polymers according to claim 1, characterized in that: The partition plate is a lead plate.

9. The method for testing the carrier mobility of insulating polymers according to claim 1, characterized in that: It also includes an X-ray excitation power supply, which includes a DC power supply, a self-excited oscillation circuit and a capacitor series voltage doubler circuit; wherein the output end of the DC power supply is connected to the input end of the self-excited oscillation circuit, the output end of the self-excited oscillation circuit is connected to the input end of the capacitor series voltage doubler circuit, and the output end of the capacitor series voltage doubler circuit is connected to the input end of the X-ray source.

10. The method for testing carrier mobility of insulating polymers according to any one of claims 1 to 9, characterized in that: It also includes a data processing unit, which is signal-connected to the current detection component to calculate the carrier mobility of the sample based on the current signal fed by the current detection component.

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