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Solar battery back silver slurry and preparing method thereof

A technology for solar cells and back silver paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of poor adhesion and contact between back silver paste and substrate The problem of high resistance, to achieve the effect of increasing adhesion and solderability, reducing contact resistance, and good printability

Inactive Publication Date: 2013-06-26
ZHEJIANG YUHUI SOLAR ENERGY SOURCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the contact resistance between the silver back electrode and the aluminum back electrode formed by the back silver paste reported in the prior art is high, and the adhesion between the back silver paste and the substrate is poor

Method used

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  • Solar battery back silver slurry and preparing method thereof
  • Solar battery back silver slurry and preparing method thereof
  • Solar battery back silver slurry and preparing method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0043] Correspondingly, the present invention also provides a kind of preparation method of back silver paste for solar cell, comprises the following steps: Bi 2 o 3 , B 2 o 3 , La 2 o 3 , ZnO, Al 2 o 3 and SiO 2 According to the weight ratio (49~71): (4~8): (1~3): (2~9): (3~7): (16~32) mixing, through hot melting, cooling, ball milling and passing Obtain lead-free glass powder after sieving; Spherical silver powder, organic carrier, solvent, plasticizer, auxiliary agent, inorganic additive and described lead-free glass powder are by weight (50~70):(12~30):( 7-10): (1-3): (0.5-2): (0.2-3): (2-8) mixed, dispersed and then filtered to obtain back silver paste for solar cells.

[0044] In the above preparation process, the present invention adjusts the contact resistance and battery conversion efficiency of silver and silicon after sintering by adjusting the ratio of lead-free glass powder and silver powder; by adjusting the ratio of organic carrier to solvent, thereby ad...

Embodiment 2～5

[0059] Using the raw materials and ratios shown in Table 1, according to the preparation method of Example 1, the back silver paste for solar cells was prepared.

[0060] Table 1 Raw materials and process conditions used in Examples 1 to 5 of the present invention

[0061]

[0062]

[0063]

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Abstract

The invention discloses solar battery back silver slurry and a preparing method thereof. The solar battery back silver slurry comprises, by weight, 50-70% of spherical silver powder, 12-30% of organic carriers, 7-10% of solvent, 1-3% of elasticizer, 0.5-2% of adjuvant, 0.2-3% of inorganic additive, and 2-8% of lead-free glass powder. Compared with the prior art, the solar battery back silver slurry has the advantages that viscosity of the back silver slurry can be adjusted via adjusting weight ratio among the adjuvant, the organic carriers and the solvent, so that the back silver slurry is enabled to have good printability, net drying and net blockage during printing process are avoided; and on the other hand, via adjusting an ingredient and content of the lead-free glass powder, contact resistance between a back silver electrode and an aluminum back electrode formed after the back silver slurry is sintered is reduced, and adhesive force and weldability of the back silver slurry are increased at the same time, so that conversion efficiency of a battery is improved.

Description

technical field [0001] The invention relates to the technical field of electronic materials, in particular to a back silver paste for solar cells and a preparation method thereof. Background technique [0002] Solar photovoltaic technology (Photovoltaic) is a technology that converts solar energy into electricity, and its core is a semiconductor material that can release electrons. As the main application form of solar photovoltaic technology, solar photovoltaic cells have two layers of semiconductors, positive and negative. When sunlight shines on the semiconductor, current is generated at the junction of the positive and negative electrodes. Therefore, solar photovoltaic cells have the characteristics of free fuel and no harmful gas emissions. Advantages, but also has the characteristics of not easy to damage, easy maintenance, quick installation and no noise. [0003] As early as 1839, the French scientist Becqurel discovered that light can generate potential differences...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/18
CPCY02P70/50
Inventor 陈春锦
Owner ZHEJIANG YUHUI SOLAR ENERGY SOURCE
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