Modified copper powder, modification method thereof and conductive paste

A copper powder and modification technology, which is applied in the field of solar cells, can solve the problems of secondary oxidation corrosion, high slurry viscosity, and limited oxidation resistance of benzotriazole, and achieve the effect of enhancing stability

Pending Publication Date: 2022-05-10
LONGI SOLAR TECH (XIAN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal copper belongs to the transition group metal, its chemical properties are very active, it is easy to oxidize to form an insulating oxide film, and this oxide film is almost non-conductive, which greatly limits the application of copper powder in electronic paste
[0004] In the prior art, copper is usually modified to protect its surface against oxidation. One existing method uses benzotriazole as a corrosion inhibitor to coat the surface of nano-copper powder to prevent oxidation of nano-copper powder. On the one hand, due to the large specific surface area of ​​nano-copper powder, the viscosity of the slurry is too high, which makes it impossible to prepare heterojunction cells with a certain aspect ratio by screen printing; on the other hand, the resistance of benzotriazole Due to the limited oxidation performance, copper powder does not have oxidation resistance above 110°C, and the hydrophobicity of benzotriazole is poor. Under heating conditions, water vapor is easy to cause secondary oxidation and corrosion on the copper surface, which cannot meet the requirements of heterojunction. Solar cell production requirements
Therefore, the research on the modification of copper powder still needs to be further studied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Copper powder is modified according to the following steps to obtain modified copper powder:

[0105] 1. Weigh hydrochloric acid and slowly pour it into deionized water. The pure resistivity of deionized water is above 10MΩ. Prepare a hydrochloric acid solution with a mass concentration of 1%. Use a magnetic stirrer at a speed of 200rmp / min and a temperature of 25°C. Stir for 5min and set aside.

[0106] 2. Add copper powder to the above hydrochloric acid solution, in which copper powder D10 0.42μm, D50 0.89μm, D90 1.62μm, D100 6.45μm, specific surface area 0.92m 2 / g, tap density 3.7g / mL, copper powder: hydrochloric acid mass ratio is 1:1.5, stirred at a stirring speed of 1000rpm / min for 5h, and the pH value is 2.9. Then put it into a centrifuge tube at a speed of 4000rpm / min, centrifuge for 6min, and filter the clear liquid with filter paper.

[0107] 3. Add deionized water in step 2, use a magnetic stirrer at a speed of 800rpm / min, stir for 30min, then put it into ...

Embodiment 2

[0117] Copper powder is modified according to the following steps to obtain modified copper powder:

[0118] 1. Weigh sulfuric acid and slowly pour it into deionized water. The pure resistivity of deionized water is above 10MΩ. Prepare a sulfuric acid solution with a mass concentration of 1%, and use a magnetic stirrer at a speed of 200rmp / min and a temperature of 25°C. Stir for 5min and set aside.

[0119] 2. Add copper powder into the above sulfuric acid solution, in which copper powder D10 0.42μm, D50 0.89μm, D90 1.62μm, D100 6.45μm, specific surface area 0.92m 2 / g, the tap density is 3.7g / mL, the mass ratio of copper powder: sulfuric acid is 1:0.8, the stirring speed is 1000rpm / min, stirring for 5h, the pH value is 3.0. Then put it into a centrifuge tube at a speed of 4000rpm / min, centrifuge for 6min, and filter the clear liquid with filter paper.

[0120] 3. Add deionized water in step 2, use a magnetic stirrer at a speed of 800rpm / min, stir for 30min, then put it into...

Embodiment 3

[0130] Copper powder is modified according to the following steps to obtain modified copper powder:

[0131] 1. Weigh hydrochloric acid and slowly pour it into deionized water. The pure resistivity of deionized water is above 10MΩ. Prepare a hydrochloric acid solution with a mass concentration of 0.05%, and use a magnetic stirrer at a speed of 200rmp / min and a temperature of 45°C. Stir for 5min and set aside.

[0132]2. Add copper powder to the above hydrochloric acid solution, in which copper powder D10 0.3μm, D50 0.7μm, D90 1.5μm, D1008.3μm, specific surface area 0.8m 2 / g, tap density 3.9g / mL, copper powder: hydrochloric acid mass ratio is 1:1.5, stirred at a stirring speed of 1000rpm / min for 3h, and the pH value is 4.5. Then put it into a centrifuge tube at a speed of 4000rpm / min, centrifuge for 6min, and filter the clear liquid with filter paper.

[0133] 3. Add deionized water in step 2, use a magnetic stirrer at a speed of 800rpm / min, stir for 30min, then put it into ...

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Abstract

The embodiment of the invention discloses modified copper powder, a modification method of the modified copper powder and conductive paste. The modification method of the copper powder comprises the steps that deoxidation treatment is conducted on the copper powder; the copper powder subjected to deoxidation treatment is in contact with an antioxidant, so that a first coating film is formed on the surface of the copper powder, and the antioxidant comprises methylbenzotriazole and/or 2-mercaptobenzothiazole sodium salt. According to the modification method, a hydrophobic and compact coating layer is formed on the surface of the copper powder through the coordination effect of methylbenzotriazole and/or 2-mercaptobenzothiazole sodium salt and the copper powder, oxidation resistance and corrosion resistance protection is provided for the copper powder, the initial oxidation resistance temperature of the copper powder under the high-humidity condition is increased to 170-250 DEG C, and the oxidation resistance of the copper powder is improved. And the stability in the environment is enhanced.

Description

technical field [0001] The application relates to the technical field of solar cells, in particular to a modified copper powder, a modification method thereof, and a conductive paste. Background technique [0002] The electrodes of heterojunction solar cells are usually prepared by using silver paste that can be cured at a temperature of about 200°C, which has the disadvantages of being expensive and easy to migrate. [0003] Among non-precious metals, copper is an ideal raw material for making electronic paste, which has good conductivity comparable to conductive silver paste, and is cheap. However, metal copper belongs to the transition group metal, its chemical properties are very active, and it is easy to oxidize to form an insulating oxide film, but this oxide film is almost non-conductive, which greatly limits the application of copper powder in electronic paste. [0004] In the prior art, copper is usually modified to protect its surface against oxidation. One existi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/102B22F1/107H01B1/02H01B1/22
CPCH01B1/02H01B1/22
Inventor 李鹏何博董鑫李健杨泽君
Owner LONGI SOLAR TECH (XIAN) CO LTD
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