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Lead-free busbar paste for front electrode of silicon solar cell and preparation method thereof

A silicon solar cell, front electrode technology, applied in conductive materials, circuits, photovoltaic power generation, etc. dispersed in non-conductive inorganic materials, can solve the problem of waste material use and so on

Active Publication Date: 2017-09-12
ZHEJIANG GUANGDA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional silicon cell manufacturing uses a screen printing process to make the front electrode, and the main grid and the fine grid use the same silver paste, which means that the optimization of the functions of the two grid line materials cannot be fully utilized, and the use of materials is wasted.

Method used

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  • Lead-free busbar paste for front electrode of silicon solar cell and preparation method thereof
  • Lead-free busbar paste for front electrode of silicon solar cell and preparation method thereof

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preparation example Construction

[0029] Another object of the present invention is to provide a method for preparing a lead-free busbar paste for front electrodes of silicon solar cells, including:

[0030] According to the component distribution ratio described in claim 1, put the weighed glass powder and organic carrier into the ball milling equipment, add zirconium balls according to the ratio of material: zirconium balls = 1:1, and carry out mixing and ball milling for 15-24 hours After the fineness is ≤7 μm, the material is filtered and discharged, and then mixed with spherical silver powder and flake silver powder and rolled by a three-roll mill to a fineness of ≤7 μm to obtain a lead-free busbar paste for the front electrode of a silicon solar cell.

[0031]Another object of the present invention is to provide the application of the lead-free busbar paste for the front electrode of the silicon solar cell to the front electrode of the silicon solar cell. The lead-free busbar paste for the front electrod...

Embodiment approach 1

[0033] Embodiment 1, a lead-free busbar paste for the front electrode of a silicon solar cell, the lead-free busbar paste includes the following components in weight percentage: spherical silver powder 55-75wt%, flake silver powder 2.5-10wt%, glass powder 1-3wt% and organic vehicle 15-40wt%, the particle diameter of the spherical silver powder is 0.5-2.5µm, the tap density is 3.0-4.0 g / ml, the particle diameter of the flake silver powder is 2.5-5µm, The tap density is 2.0-3.5 g / ml, and the glass powder is Bi 2 o 3 - SiO 2 -B 2 o 3 -TeO 2 - ZnO glass system.

Embodiment approach 2

[0034] Embodiment 2 is the same as Embodiment 1, except that the particle diameter of the glass powder is 0.1-3 µm, and the specific surface area is 3.5-5.5 m 2 / g.

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Abstract

The invention relates to the technical field of manufacturing technology and materials of electronic devices, and more specifically, to a lead-free busbar paste for a front electrode of a silicon solar cell and a preparation method thereof. The lead-free busbar paste comprises the following components by weight percentage: spherical silver powder 55-75wt%, flake silver powder 2.5-10wt%, glass powder 1-3wt% and organic vehicle 15-40wt%, the spherical silver powder The particle size is 0.5-2.5 µm, the tap density is 3.0-4.0 g / ml, the particle size of the flake silver powder is 2.5-5 µm, the tap density is 2.0-3.5 g / ml, and the glass powder is Bi2O3- SiO2-B2O3-TeO2-ZnO glass system, the components in the lead-free busbar paste have good dispersion, and the silicon solar cell products obtained after sintering have stable electrical properties, which improves the effective lighting area of ​​solar silicon wafers , Improve the conversion efficiency of solar panels.

Description

technical field [0001] The invention relates to the technical field of manufacturing technology and materials of electronic devices, and more specifically, to a lead-free busbar paste for a front electrode of a silicon solar cell and a preparation method thereof. Background technique [0002] Solar photovoltaic power generation has become the fastest and largest industry in the field of renewable energy after wind power generation. At present, the solar cells in photovoltaic power generation are still dominated by crystalline silicon solar cells, which are thriving, with a market share of 90%, and the efficiency of large-scale commercial solar cells can reach 18-19%. At present, solar cell manufacturers use back electrode paste with low silver content in the back electrode and change the graphic design of the back electrode to reduce the amount of silver used, which can effectively reduce the production cost of the back electrode of solar paste; while for positive electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50
Inventor 谢继峰杨至灏左晨东曾文董淑斌
Owner ZHEJIANG GUANGDA ELECTRONICS TECH
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