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Low-temperature silver paste for HIT solar cell and preparation method of low-temperature silver paste

A solar cell, low temperature technology, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. performance, increase in lap points and lap area, and the effect of increasing lap points and lap area

Active Publication Date: 2021-05-28
苏州思尔维纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to meet the requirement of electrical conductivity, the silver content of the low temperature silver paste used for HIT solar cells is very high, which leads to a very high cost

Method used

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  • Low-temperature silver paste for HIT solar cell and preparation method of low-temperature silver paste
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  • Low-temperature silver paste for HIT solar cell and preparation method of low-temperature silver paste

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preparation example Construction

[0063] In the second aspect, the embodiment of the present disclosure provides a method for preparing a low-temperature silver paste for HIT solar cells as described above, such as figure 2 shown, including:

[0064] Step S100, grinding silver-containing conductive components;

[0065] Step S200, applying the additive and the resin to the organic solvent at a preset temperature, and uniformly mixing to obtain a mixed solution;

[0066] Step S300, uniformly mixing silver salt, strong acid and reducing solvent to obtain flux;

[0067] In step S400, the ground silver-containing conductive component, mixed solution and flux are placed in a planetary mixer and stirred for a preset time to obtain a low-temperature silver paste for HIT solar cells.

[0068] The preparation method provided by the embodiments of the present disclosure has simple process, mild conditions, and low environmental requirements, so it is suitable for large-scale production.

[0069] According to a specif...

Embodiment 1

[0077] An embodiment of the present disclosure provides a low-temperature silver paste for HIT solar cells, including the following mass percentages of raw materials: 51.5% silver-containing conductive components, 26% organic solvents, 15% resins, 0.5% surfactants, 0.8% dispersant, 0.7% coupling agent, 0.5% other additives and 5% flux. The flux is composed of 1.1% silver nitrate, 9% nitric acid and 89.9% ethanol in mass percent. The silver-containing conductive component is composed of the following components: spherical silver with a mass ratio of 65%, flake silver with a mass ratio of 30%, silver nanoparticles with a mass ratio of 3.5% and silver citrate with a mass ratio of 1.5% . The organic solvent is terpineol. The resin is a thermosetting resin. The dispersant is ethyl cellulose. The surfactant is sodium laurylate. The coupling agent is vinyltrimethoxysilane. The other additives are leveling agents.

[0078] The preparation method of this low-temperature silver p...

Embodiment 2

[0085] The difference between Embodiment 2 of the present disclosure and Embodiment 1 is that the flux is composed of 2% silver nitrate, 10% nitric acid and 88% ethanol in mass percentages. Moreover, the mass percentage of silver-containing conductive components in the low-temperature silver paste is 53.1%, and other components in the low-temperature silver paste are reduced in the same proportion. Correspondingly, in the preparation method of the low-temperature silver paste, in step 3, the silver nitrate, 10% nitric acid and 88% ethanol are respectively mixed in the mass percentage under the condition of stirring (rotating speed is 500r / min). Silver nitrate and nitric acid are added to ethanol.

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Abstract

The embodiment of the invention provides low-temperature silver paste for an HIT solar cell and a preparation method of the low-temperature silver paste. The low-temperature silver paste comprises the following raw materials in percentage by mass: 35%-75% of a silver-containing conductive component, 0.5%-30% of resin, 1.8%-22% of an auxiliary agent, 5%-40% of an organic solvent and 0.1%-10% of a flux, wherein the flux is composed of silver salt, strong acid and a reducing solvent. According to the scheme, under the condition that the same conductivity is achieved, the usage amount of the silver-containing conductive component of the low-temperature silver paste is far smaller than that of the silver-containing conductive component in the prior art.

Description

technical field [0001] The present disclosure relates to the technical field of heterojunction solar cells, in particular to a low-temperature silver paste for HIT solar cells and a preparation method thereof. Background technique [0002] HIT solar cells have become the most promising solar cells due to their high conversion efficiency, high stability, and double-sided power generation. Due to the special structure of HIT solar cells, high-temperature sintered silver paste cannot be applied to the front and back, because high temperature will damage the transparent conductive layer (TCO layer, such as ITO), therefore, low-temperature sintered (<250°C) silver paste must be used. However, in order to meet the requirement of electrical conductivity, the silver content of the low-temperature silver paste used for HIT solar cells is very high, which leads to a very high cost. Contents of the invention [0003] In view of this, embodiments of the present disclosure provide ...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00
CPCH01B1/22H01B13/00
Inventor 孟祥浩戴烨斌
Owner 苏州思尔维纳米科技有限公司
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