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A busbar front silver paste suitable for step-by-step screen printing

A technology of screen printing and silver paste, applied in the direction of conductive materials, semiconductor devices, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problems of high solid content and high cost of paste, and achieve excellent electrical conductivity, The effect of low cost and low solid content

Active Publication Date: 2021-07-16
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the preparation of electrodes using the above slurry still has the following disadvantages:
[0009] 1) The improvement of electrical performance is mainly by improving the contact performance, which is very limited;
[0010] 2) The solid content of the slurry is higher and the cost is higher;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A busbar front silver paste suitable for step-by-step screen printing, comprising the following components in weight percentage: silver powder 80wt%, organic vehicle 10wt%, glass powder 2.0wt%, diluent 3.0wt%, nano silver Thread 3wt% and erucamide 2.0wt%;

[0034] The silver powder comprises the following components by weight percentage: 15wt% of spherical silver powder, 40wt% of spherical silver powder, 30wt% of flake silver powder and 15wt% of nano silver powder; the surface of the silver powder is coated with a fatty acid dispersant;

[0035] The organic vehicle comprises the following components in percentage by weight: terpineol 80wt%, thickener 12wt%, dispersant 4wt%, wetting agent 2wt% and thixotropic agent 2wt%; thickener is ethyl cellulose The mixture of cellulose and epoxy resin, and the weight ratio of ethyl cellulose and epoxy resin is 1:0.8, and the thixotropic agent is polyethylene wax.

[0036] The glass powder is a silicate glass, expressed in weight pe...

Embodiment 2

[0038] The busbar front silver paste of this embodiment is basically the same as that of Embodiment 1, except that the silicate glass of this embodiment is represented by the following oxide-based weight percentages: SiO 2 45wt%, PbO 30wt%, Bi 2 o 3 15wt%, B 2 o 3 8wt%, CuO 1wt%, and MnO 2 1 wt%.

Embodiment 3

[0040] The busbar front silver paste of this embodiment is basically the same as that of Embodiment 1, except that the silicate glass of this embodiment is represented by the following oxide-based weight percentages: SiO 2 50wt%, PbO 20wt%, Bi 2 o 3 18wt%, B 2 o 38wt%, ZnO 2wt, CuO 1wt%, and MnO 2 1 wt%.

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Abstract

The invention discloses a front silver paste for busbars suitable for step-by-step screen printing. The slurry includes the following components by weight percentage: silver powder 78-89wt%, organic carrier 5-15wt%, glass powder 1.2-3.0wt%, diluent 2.0-15wt% and auxiliary agent 0.2-5.0wt%, so The glass powder includes at least one of silicate glass, borate glass, phosphate glass and heavy metal oxide glass, and the auxiliary agent includes an adhesion promoter. By optimizing the formula composition, the prepared slurry has low solid content, low cost, good electrical conductivity and strong adhesion, and is suitable for step-by-step screen printing of the busbar.

Description

technical field [0001] The invention relates to the field of electronic materials, in particular to a busbar front silver paste suitable for step-by-step screen printing. Background technique [0002] Improving the electrical performance and reducing the cost of crystalline silicon solar cells is an eternal theme in the photovoltaic industry. From new battery technology to new slurry technology, they are all centered on this theme. With the development of new battery technology, busbar battery paste is also constantly updated and improved. The busbar battery paste is suitable for printing the busbar part by step-by-step screen printing. It involves conventional p-type polycrystalline cells, monocrystalline cells, perc cells, n-type cells, n-pert cells, and topcon cells. . [0003] There are three printing methods for metallizing the main grid and sub-grid on the surface of the cell, including single printing, secondary printing and step-by-step printing. Single printing c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224C03C3/108
CPCC03C3/108H01B1/22H01L31/022425
Inventor 黄淑枚丁冰冰孙倩黄铭
Owner GUANGZHOU RUXING TECH DEV
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