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Single component HJT battery low temperature silver paste

A single-component, low-temperature technology, applied in the direction of conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problem of poor balance of adhesion and resistivity, insufficient aging resistance, and the need to improve contact To achieve the balance of adhesion and conductivity, optimize the printing screen performance, and improve the adhesion

Active Publication Date: 2019-04-26
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the resin content is low, the resistivity will be low, but the adhesion effect will be poor
Therefore, the balance of adhesion and resistivity between the particles and between the particles and the conductive film is not good simply by resin curing.
[0007] 3) There is generally a benzene ring structure in epoxy resin, which is relatively brittle and resistant to photolysis, and the aging resistance is not good enough
However, a large part of the silver powder in the HJT low-temperature silver paste is flake powder. Compared with the spherical powder, the screen-passing and linear shape of the flake powder are obviously worse than those of the high-temperature sintered silver paste.
[0009] 5) The contact between the TCO film layer and the silver paste needs to be improved after curing

Method used

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  • Single component HJT battery low temperature silver paste
  • Single component HJT battery low temperature silver paste
  • Single component HJT battery low temperature silver paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] An example of a low-temperature silver paste for a single-component HJT battery of the present invention, the composition of the low-temperature silver paste for a single-component HJT battery in this example is shown in Table 1.

[0040] The preparation method of the low-temperature silver paste for the single-component HJT battery shown in this embodiment is:

[0041] After weighing according to the formula, mix and stir the resin, the first conductive powder, and the second conductive powder on a planetary mixer platform according to (1000 rpm / min) for 70 seconds, roll after stirring, and then add curing agent, auxiliary After the agent is passed through a three-roll mill.

Embodiment 2～5 and comparative example 1-2

[0043] The composition components of Examples 2-5 and Comparative Examples 1-2 are as shown in Table 1, and the preparation method of the single-component HJT battery low-temperature silver paste described in Examples 2-5 and Comparative Examples 1-2 is the same as that in Example 1.

[0044] The burning loss rate is the burning loss rate measured at 500°C for 30 minutes.

[0045] Simultaneously, the following properties of the low-temperature silver paste for single-component HJT batteries described in Examples 1 to 5 and Comparative Examples 1 to 2 were tested: resistivity after curing, adhesion, photolysis resistance, aging resistance, printing screen performance, Product service life, linear aspect ratio after curing. Among them, the test methods for each performance are:

[0046] Resistivity after curing: Print a fixed pattern (serpentine pattern with a length of 10cm and a width of 1mm), and measure the resistance value after curing. Calculate the resistivity accordin...

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Abstract

The invention discloses a single component HJT battery low temperature silver paste comprising the following components by weight: 50-90 parts of first conductive powder, 5-40 parts of second conductive powder, 1-2 parts of thermosetting resin, 0-5 parts of curing agent and 0-5 parts of auxiliary agent. The first conductive powder is flake silver powder, and the second conductive powder is at least one of nano conductive powder, low melting point conductive metal powder, low melting point conductive alloy powder, high melting point conductive metal powder and high melting point conductive alloy powder. The HJT battery low temperature silver paste has low resistivity after cured, good adhesion of conductive particles, good over-net performance, excellent aspect ratio, photolysis resistance,aging resistance and lower cost.

Description

technical field [0001] The invention relates to a conductive silver paste and a preparation method of the conductive silver paste, in particular to a low-temperature silver paste for a single-component HJT battery. Background technique [0002] HJT battery is one of the high-efficiency batteries that can be mass-produced at present. Due to its unique structure, the requirements for surface metal silver paste are essentially different from those of traditional crystalline silicon batteries. The traditional metal conductive silver paste is a high-temperature sintering type, and the contact between the silver paste itself and the silver-silicon is formed by high-temperature sintering. The low-temperature silver paste of HJT battery is cured at a relatively low temperature (below 250°C), without high-temperature sintering, and the contact between silver particles and between silver particles and TCO is mainly cured by cross-linking of organic polymers. The contact interface of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425
Inventor 何家文丁冰冰刘银花
Owner GUANGZHOU RUXING TECH DEV
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