High-crystallization silver powder, low-cost heterojunction silver paste and preparation method and application of high-crystallization silver powder and low-cost heterojunction silver paste

A high crystallization and heterojunction technology, which is applied to equipment for manufacturing conductive/semiconductive layers, cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problem of high cost of using silver paste, The conductive performance is reduced, and the problem of copper oxidation cannot be solved, so as to achieve the effect of ensuring anti-oxidation performance, ensuring electrical conductivity, and improving the cured crosslinking density

Pending Publication Date: 2022-03-15
SUZHOU BETELY POLYMER MATERIALS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional heterojunction solar cell electrode silver paste is made of high-purity (>99%) silver powder, the price of silver is relatively high, and traditional heterojunction silver paste has a very high silver content, so the production and use of silver paste The cost is very high; some people also advocate the use of copper-silver alloy, but because of the inability to solve the problem of copper oxidation, the electrical conductivity is greatly reduced

Method used

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  • High-crystallization silver powder, low-cost heterojunction silver paste and preparation method and application of high-crystallization silver powder and low-cost heterojunction silver paste
  • High-crystallization silver powder, low-cost heterojunction silver paste and preparation method and application of high-crystallization silver powder and low-cost heterojunction silver paste
  • High-crystallization silver powder, low-cost heterojunction silver paste and preparation method and application of high-crystallization silver powder and low-cost heterojunction silver paste

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preparation example Construction

[0031] The invention discloses a preparation method of the above-mentioned high crystallization silver powder, comprising the following steps: after the surface of the inorganic powder is smoothed, a layer of silver is coated on the surface of the inorganic powder by chemical reduction method, which has high crystallinity, thereby synthesizing a A silver-coated inorganic nano-powder type high crystallization spherical silver powder. Concrete, the preparation method of high crystalline silver powder of the present invention is as follows:

[0032] Step a. The inorganic nano-powder is subjected to surface smoothing treatment by impacting the polishing equipment (jet-milling equipment) with an airflow. The process uses dry nitrogen to avoid the agglomeration of the nano-powder due to moisture absorption, resulting in agglomerated internal powders that cannot be obtained well. The smoothing treatment; the air pressure is 0.05-0.5MPa, if the air pressure is too small, the impact fo...

Embodiment 1

[0059] Take the glass powder with D50=183nm, the product name is GF-01, the laser particle size test results are as follows Figure 5 Smoothing was performed using jet mill equipment as indicated. The working process of the jet mill equipment is a conventional technology, such as using dry compressed gas to continuously blow the powder from the inlet of the jet mill into the cavity of the jet mill, and the powder will be driven by the airflow to meet the wall of the jet mill cavity. Friction is carried out to achieve a smooth polishing effect. After the powder comes out of the jet mill chamber, the powder is separated from the air flow by a cyclone separator and a filter element. The equipment can control the smoothness of the powder by controlling the pressure of the air flow. In this embodiment, the airflow pressure is set at 0.25MPa. Take 1.5g smoothed GF-01 glass powder, 1.5g anti-flocculation agent polyvinylpyrrolidone PVP-K30, 0.3g dispersant (Tween-80), 1000g deionized...

Embodiment 2

[0064] The inorganic nanocrystal core used is changed to D50=153nm zirconia type ceramic powder, the product name is TO-01, and the laser particle size test result is Figure 6 As shown, the usage amount is 2.3g, other processes are the same as in Example 1, the D50=1.98 μm of the obtained silver-coated ceramic powder, the high temperature heat loss=0.24%, and the specific surface area=0.34m 2 / g, tap density=6.02g / cm 3 , the scanning electron microscope image is shown in image 3 As shown, the laser particle size test results are Figure 8 shown.

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Abstract

The invention discloses high-crystallization silver powder and low-cost heterojunction silver paste and a preparation method and application thereof.The preparation method comprises the steps that inorganic powder is subjected to surface smoothing treatment and then mixed with an anti-flocculating agent, a dispersing agent and water to obtain inorganic powder dispersion liquid, then the inorganic powder dispersion liquid is mixed with a reducing agent, a particle size control agent and water-soluble silver salt, and the high-crystallization silver powder and low-cost heterojunction silver paste is obtained. The surface of the inorganic powder is coated with a silver layer through a chemical reduction method, and therefore the silver-coated inorganic matter nanometer powder type high-crystallization ball-like silver powder is synthesized. According to the silver paste formula, the high-dispersity flaky silver powder is added to be matched with the high-crystallization silver powder, the conductivity of the silver paste is effectively improved, and meanwhile the fine printing performance of the silver paste is reserved.

Description

technical field [0001] The technical invention is applied to the production of conductive silver paste and silver powder of heterojunction solar cells in the technical field of solar cell photovoltaic industry. Background technique [0002] As a clean energy source, photovoltaic power generation has always been sought after by people, and the heterojunction solar cell has been developed rapidly because of its unique advantages. From the production point of view, the heterojunction solar cell can It is made thinner, so as to improve the utilization efficiency of crystalline silicon. In addition, from the perspective of energy consumption in the production process, the curing temperature of heterojunction silver paste is very low, and it can be cured within only 200°C; from the perspective of performance, heterojunction The battery will not produce polarization, has high light stability, and has a high opening voltage, so the heterojunction battery has a higher photoelectric c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00
CPCH01B1/16H01B1/22H01B13/0026
Inventor 吴立泰董飞龙周湘辉金余李亮欧阳旭频鲁斌
Owner SUZHOU BETELY POLYMER MATERIALS CO LTD
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