Conductive silver paste and preparation method thereof

A conductive silver paste and compound technology, which is applied in the field of solar cells, can solve the problems of poor matching of diffusion high square resistance, affecting battery conversion efficiency, and poor mesh permeability, so as to improve the selective collection rate and change Viscosity change, reduced formation effect

Active Publication Date: 2014-06-18
GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the design trend of the traditional battery structure towards high-efficiency solar cells is mostly to increase the diffusion resistance, increase the number of front grid lines, and reduce the width of the grid lines. Under the conditions of the new screen printing screen design (>78 grid lines, line width 50μm), the existing conductive silver paste technology has poor mesh permeability and unsatisfactory aspect ratio during screen printing (rough printing or collapse), the series resistance Rs after sintering is too high (poor matching with the diffusion high square resistance), which affects the conversion efficiency of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The conductive silver paste provided in this embodiment includes conventional conductive silver paste, which also contains zinc oxide and an indium-containing compound, wherein the amount of zinc oxide accounts for 3% of the total mass of the conventional conductive silver paste, and the indium-containing compound The dosage accounts for 3% of the total mass of the conductive silver paste, and the molecular formula of the indium-containing compound is G 3 B(Al(C 2 h 5 o 7 ) 3 ), which is prepared by the following method: take the raw materials containing elements boron B, gallium Ga, indium In and thallium Tl with a molar ratio of about 1:3:3:3, and after uniform mixing, the obtained product is known as compound G 3 B means that boron B, gallium Ga, indium In, and thallium Tl can be in the form of simple substances, or in the form of compounds or mixtures (the same below), and the raw materials of aluminum-containing metal particles and absolute ethanol are roughly 1...

Embodiment 2

[0024] The conductive silver paste provided in this embodiment includes conventional conductive silver paste, which also contains zinc oxide and an indium-containing compound, wherein the amount of zinc oxide accounts for 5% of the total mass of the conventional conductive silver paste, and the indium-containing compound The amount used is 1% of the total mass of the conductive silver paste, and the molecular formula of the indium-containing compound is G 3 B(Al(C2 h 5 o 7 ) 3 ), which is obtained through the deployment of the following method, taking elements boron B, gallium Ga, indium In and thallium Tl with a molar ratio of about 1:3:3:3, mixing, and the product is compound G 3 B means that the aluminum metal particles are mixed with absolute ethanol, the molar ratio of the two is about 1:2~4, and the product is obtained as the compound Al(C 2 h 5 o 7 ) 3 Indicates that the compound G 3 B joins the compound Al(C 2 h 5 o 7 ) 3 In, mix well, let stand to precipita...

Embodiment 3

[0027] The conductive silver paste provided in this embodiment includes conventional conductive silver paste, which also contains zinc oxide and an indium-containing compound in the conventional conductive silver paste, wherein the amount of zinc oxide accounts for 4% of the total mass of the conventional conductive silver paste, and the indium-containing compound The dosage accounts for 2% of the total mass of the conductive silver paste, and the molecular formula of the indium-containing compound is G 3 B(Al(C 2 h 5 o 7 ) 3 ), which is prepared by the following method: take elements boron B, gallium Ga, indium In and thallium Tl in a molar ratio of about 1:3:3:3, mix well, and the product is compound G 3 B means that the aluminum metal particles are mixed with absolute ethanol, the molar ratio of the two is about 1:2~4, and the product is obtained as the compound Al(C 2 h 5 o 7 ) 3 Indicates that the compound G 3 B joins the compound Al(C 2 h 5 o 7 ) 3 In, mix we...

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Abstract

The invention discloses conductive silver paste, which comprises conventional conductive silver paste added with zinc oxide and indium compounds. The conductive silver paste has better viscosity coefficient, good mesh permeability after screening, optimal height-width ratio after printing, smaller serial resistance Rs after sintering, and can improve the conversion efficiency of a battery. The invention further discloses a preparation method of the conductive silver paste. The method comprises the following steps: adding zinc oxide and indium compounds according to the dosage in the conventional conductive silver paste; heating to 40-60 DEG C; and mixing uniformly to obtain the conductive silver paste. The preparation method has simple process, low investment in equipment, relatively lower cost of materials, high production rate and rapid volume production, and is appropriate for industrialized large scale production.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a conductive silver paste and a preparation method thereof. Background technique [0002] A solar cell is a solid device that converts light energy into electrical energy by using the semiconductor P-N junction photovoltaic effect, also known as a photovoltaic device. Doped with trivalent element boron (Boron) and composed of P-type semiconductors that rely on hole conduction, the interface is the rigid junction, which is an important component of the crystalline silicon solar cell system. In order to reduce reflection, the entire battery surface will be covered with a special anti-reflection film. Usually, there are very thin metal grid lines on the surface of N-type semiconductors, and the other side is close to P-type silicon. However, the important material for making this metal grid line is conductive silver paste. The design of conductive silver paste has a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 秦崇德班群康凯陈刚
Owner GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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