Sliver paste for lead-free environment-friendly solar photovoltaic cells and preparation method of silver paste

A photovoltaic cell and solar energy technology, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems affecting the uniformity of silver powder, screen printing cracks, and increased contact resistance. Achieve good economic benefits, high yield, and reduce shrinkage

Active Publication Date: 2012-12-19
CHINALAND SOLAR ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the content of silver powder in the technical silver paste is higher than 70%, and the production cost is relatively high. Reducing the cost of silver paste is an important part of reducing the cost of solar cells, and it can also make solar cells have more market advantages; The particle size of the silver powder used in the existing silver paste is basically the same, so if the particle size of the silver powder is too large, cracks will appear in the screen printing, and the contact resistance will increase. If the particle size of the silver powder is too small, the silver powder will agglomerate Problems affect the uniformity of silver powder distribution, so it is necessary to effectively control the particle size of silver powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of glass powder A

[0036] Get the raw material of following weight portion: Bi 2 o 3 24 copies, B 2 o 3 15 parts, SiO 2 8 copies, Co 2 o 3 7 parts, ZnO 4 parts, V 2 o 5 3 parts, Al 2 o 3 Put 3 parts into a vibrating ball mill and mill for 2 hours. After ball milling, the mixture is homogeneous and melted in a high-temperature sintering furnace at 1100 ° C for 2 h, then quenched with deionized water at room temperature, dried at 90 ° C, vibrated and ground, and passed through a 300-mesh sieve. Cool, then keep warm at 650°C for 6 hours, then quench with deionized water, grind, pass through sieves with different meshes, collect 1 μm glass powder, 12 μm glass powder and 24 μm glass powder respectively, and soak them in 25% hydrochloric acid respectively 2 h, then washed with deionized water until neutral, and dried for later use;

[0037] (2) Preparation of glass powder B

[0038] Get the following raw materials in parts by weight: SiO ...

Embodiment 2

[0056] (1) Preparation of glass powder A

[0057] Get the raw material of following weight portion: Bi 2 o 3 30 copies, B 2 o 3 20 parts, SiO 2 6 copies, Co 2 o 3 4 parts, ZnO 3 parts, V 2 o 5 4 parts, Al 2 o 3 Put 2 parts into a vibrating ball mill for 2 hours. After ball milling, put the mixture into a sintering furnace at 1200°C for 3 hours, then quench it with deionized water at room temperature, dry it at 90°C, vibrate and grind it, and pass it through a 200-mesh sieve. Cool, then keep warm at 700°C for 6 h, then quench with deionized water, grind, pass through sieves with different meshes, collect 5 μm glass powder, 14 μm glass powder and 25 μm glass powder respectively, and soak them in 30% hydrochloric acid respectively 2 h, then washed with deionized water until neutral, and dried for later use;

[0058] (2) Preparation of glass powder B

[0059] Get the following raw materials in parts by weight: SiO 2 20 copies, B 2 o 3 10 parts, BaO 6 parts...

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PUM

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Abstract

The invention discloses a sliver paste for lead-free environment-friendly solar photovoltaic cells and a preparation method of the silver paste. The silver paste is made of paste A and paste B by means of mixing in equal proportion and ball milling. The prepared silver paste is free of lead and low in damage to a human body and the environment and completely meets the requirement on environment protection. Silver powder of equal particle diameters and other conductive particles are selected for filling clearances of the sliver powder, so that the stacking density of a coating is improved, the contact area among the particles is widened, the shrinkage force of the coating is reduced, and the conductivity of the silver paste is improved. Since aluminum powder and copper powder are added into the conductive paste, production cost of the silver paste can be reduced while conductivity of the silver paste is improved. Consequently, manufacturing cost of solar cells is reduced, and high economic benefit is achieved.

Description

technical field [0001] The invention relates to a lead-free and environment-friendly silver paste for solar photovoltaic cells and a preparation method thereof, belonging to the technical field of preparation of conductive paste for solar cells. Background technique [0002] The conductive silver paste of solar cells is prepared from silver powder, glass binder, organic solvent and other raw materials according to different ratios, in which silver powder is used as a conductive medium; glass binder is melted during high-temperature sintering, and forms between silver powder and silicon substrate. Ohmic contact; the organic solvent mainly plays the role of dispersing and wrapping, and the silver powder particles are uniformly [0003] Wrapped up, so that the silver powder in the conductive silver paste is not easy to precipitate and oxidize. [0004] At present, the glass binder used in the conductive silver paste of solar cells is a Bi-Si-Pb glass mixed powder. Although th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 郭万东汪圣付袁艺琴孟祥法刘晶晶董培才
Owner CHINALAND SOLAR ENERGY
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