Conductive lead-free silver paste mixed with copper powder and aluminum powder for solar cell and preparation method of conductive lead-free silver paste

A technology of solar cells and conductive silver paste, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. problems, to achieve good economic benefits, high yield, and reduce the effect of shrinkage force

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: B 2 o 3 20 parts, SiO 2 15 parts, ZnO 10 parts, CaO 6 parts, TiO 2 5 parts, BaO 4 parts, Na 2 4 parts of O, mixed evenly, placed in a high-temperature muffle furnace at 1100°C for sintering, kept for 45 minutes, quenched with deionized water, ground, passed through a 240-mesh sieve, cooled, and kept at 700°C for 5 hours, and then Quench with deionized water, grind, pass through sieves of different meshes, collect 3μm glass powder, 15μm glass powder and 24μm glass powder respectively, soak in 26% hydrochloric acid for 1.5 hours, and then wash with deionized water until neutral , dried for later use;

[0037] (2) Preparation of glass powder B

[0038] Get the following raw materials in parts by weight: SiO 2 15 copies, B 2 o 3 8 parts, BaO 6 parts, MgO 4 parts, AgO 2 3 copies, Y 2 o 3 4 copies, Co 2 o 3 2 parts, mixed evenly, placed in a high-temperature muf...

Embodiment 2

[0056] (1) Preparation of glass powder A

[0057] Get the raw material of following weight portion: B 2 o 3 40 parts, SiO 2 12 parts, ZnO 8 parts, CaO 6 parts, TiO 2 4 parts, BaO 4 parts, Na 2 3 parts of O, mixed evenly, placed in a high-temperature muffle furnace at 1160°C for sintering, kept for 45 minutes, then quenched with deionized water, ground, passed through a 240 mesh sieve, cooled, and then kept at 700°C for 6 hours, and then Quench with deionized water, grind, pass through sieves with different meshes, collect 5μm glass powder, 12μm glass powder and 22μm glass powder respectively, soak in 28% hydrochloric acid for 2 hours, and then wash with deionized water until neutral , 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 8 parts, BaO 6 parts, MgO 4 parts, AgO 2 3 copies, Y 2 o 3 4 copies, Co 2 o 3 2 parts, mixed evenly, placed in a high-temper...

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PUM

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Abstract

The invention discloses conductive lead-free silver paste mixed with copper powder and aluminum powder for a solar cell and a preparation method of the conductive lead-free silver paste. The conductive silver paste is obtained by mixing two parts of slurries including A and B according to equal proportion and subjecting the mixture to ball milling. The silver paste prepared is free of lead, less harmful to human body and environment, and completely in conformity with environmental requirements. By selecting silver power uniform in particle size for the silver paste and other conducting particles to fill gaps of the silver powder, stacking density of a film is improved, contact area between particles is enlarged, convergent force of the film is reduced, and conducting capability of the silver paste is improved. By adding aluminum powder and copper powder into conductive slurry, reduction of preparation cost of the silver paste is facilitated, conductivity of the silver paste is improved, thus manufacturing cost of the solar cells is reduced, and good economic benefit is gained.

Description

technical field [0001] The invention relates to a lead-free solar cell conductive silver paste mixed with copper and aluminum powder and a preparation method thereof, belonging to the technical field of solar cell conductive paste preparation. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00
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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