Silver paste for environmental-friendly lead-free silicon solar cell front electrode and preparation method of silver paste

A technology of solar cells and crystalline silicon, 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, increasing contact resistance, and screen printing cracks , to achieve good economic benefits, reduce shrinkage, and high yield

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

[0034] (1) Preparation of glass powder A

[0035] Get the raw material of following weight portion: Bi 2 o 3 20 parts, SiO 2 15 copies, B 2 o 3 10 parts, Al 2 o 3 6 parts, CaO 4 parts, Co 2 o 3 3 parts, AgO 2 2 parts, mixed evenly, placed in a high-temperature muffle furnace at 1100°C for sintering, kept for 40 minutes, then quenched with deionized water, ground, passed through a 250-mesh sieve, cooled, and kept at -700°C for 5 hours, and then used Quenching with deionized water, grinding, passing through sieves of different meshes, collecting 3 μm glass powder, 10 μm glass powder and 20 μm glass powder respectively, soaking them in 25% hydrochloric acid for 2 hours, and then washing them with deionized water until neutral. drying spare;

[0036] (2) Preparation of glass powder B

[0037] Get the following raw materials in parts by weight: SiO 2 15 copies, B 2 o 3 8 parts, TiO 2 6 copies, V 2 o 5 4 parts, BaO4 parts, Al 2 o 3 3 parts, AgO 2 2 p...

Embodiment 2

[0054] (1) Preparation of glass powder A

[0055] Get the raw material of following weight portion: Bi 2 o 3 30 parts, SiO 2 15 copies, B 2 o 3 8 parts, Al 2 o 3 8 parts, CaO 4 parts, Co 2 o 3 4 parts, AgO 2 3 parts, mixed evenly, placed in a high-temperature muffle furnace at 1200°C for sintering, kept for 50 minutes, quenched with deionized water, ground, passed through a 250-mesh sieve, cooled, and kept at 700°C for 6 hours, and then used Quenching with deionized water, grinding, passing through sieves of different meshes, collecting 4μm glass powder, 12μm glass powder and 24μm glass powder respectively, soaking in 25% hydrochloric acid for 2 hours, and then washing with deionized water until neutral, drying spare;

[0056] (2) Preparation of glass powder B

[0057] Get the following raw materials in parts by weight: SiO 2 20 copies, B 2 o 3 10 parts, TiO 2 5 copies, V 2 o 5 5 parts, BaO 5 parts, Al 2 o 3 3 parts, AgO 2 2 parts, mixed eve...

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PUM

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Abstract

The invention discloses a silver paste for an environmental-friendly lead-free silicon solar cell front electrode and a preparation method of the silver paste. The aluminum powder mixed silver paste is prepared from a slurry A and a slurry B through mixing and ball-grinding at an equal proportion. The silver paste prepared by adopting the preparation method does not contain lead, is little in damage to a human body and an environment, and completely accords with the requirement of environmental friendliness. According to the invention, silver powder with same particle diameter and other conductive particles are selected to be filled in gaps among the silver powder, thus the packing density of a membrane layer is increased, the contact area among the particles is increased, and the contraction force of the membrane layer is lowered, thus the conduction capacity of the silver paste is increased. According to the invention, copper powder and aluminum powder are added in the silver paste, thus the production cost of the silver paste is favorably lowered, and the conduction property of the silver paste is improved, therefore, the purpose of reducing manufacture cost of a solar cell is achieved, and a better economic benefit is obtained.

Description

technical field [0001] The invention relates to a lead-free environment-friendly crystalline silicon solar cell front silver paste and a preparation method thereof, belonging to the technical field of preparation of solar cell conductive paste. 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 thi...

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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