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Silver conductive paste for front electrode of crystalline silicon solar cell and preparation method thereof

A technology for solar cells and silver conductor paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, semiconductor devices, etc. The particles are easy to agglomerate in large quantities, so as to eliminate the Schottky barrier, improve the melting speed, and improve the co-melting behavior.

Active Publication Date: 2012-02-15
JIANGSU HOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size distribution of the glass powder produced by this method is uneven, the particles are easy to agglomerate in large quantities, it is difficult to completely evaporate the water during drying, the powder is heated unevenly, and it takes several hours, the efficiency is low, and the quality is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1. Preparation of glass powder comprising glass metal aggregates:

[0055] a, SiO by mass percentage 2 25%, A1 2 o 3 0.7%, Bi 2 o 3 60%, B 2 o 3 8%, ZnO 2.5%, TiO 2 3.8% Weigh a total of 15 parts of the above oxides, weigh 3.5 parts of metal powder Se, and mix;

[0056] b. Place the above mixture in a microwave sintering furnace with a frequency of 2.45GHZ and a temperature of 1500°C (infrared temperature measurement), keep the temperature constant for 20-30 minutes, and melt;

[0057] c, water quenching the molten glass mixture after melting;

[0058] d, putting the water-quenched mixture into a microwave sintering furnace for drying;

[0059] e. Transfer the dried mixture to a ball mill for grinding, and then sieve to obtain glass powder containing glass metal aggregates.

[0060] Step 2. Preparation of organic carrier

[0061] Weigh a certain amount of terpineol, butyl carbitol, and diethyl phthalate in a ratio of 9:5:2, configure them as solvent...

Embodiment 2

[0064] In Example 2, the only difference from Example 1 is that the lead mixture does not contain PbS composite particles with a core-shell structure, all are lead oxide particles, but the preparation method of the silver paste, the quality and composition ratio of each component it's the same.

Embodiment 3

[0066] In Example 3, the only difference from Example 1 is that the mass ratio of the metal powder in the glass powder to the total amount of oxides is 0.6:98, but the preparation method of the silver paste, the mass and composition ratio of each component are the same.

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Abstract

The invention relates to silver conductive paste for a front electrode of a crystalline silicon solar cell. The silver conductive paste comprises the following components in parts by mass: 75-98 parts of silver powder, 1-15 parts of glass powder, 5-60 parts of an organic carrier, 0-10 parts of an additive and 0.1-10 parts of a lead mixture, wherein, the silver powder contains silver particles andsilver particles which are provided with a core-shell structure and the surfaces of which are coated with silicon alloy powder; the glass powder is a glass metal aggregate formed by microwave-meltingand drying and co-grinding an oxide and one or more of Pt, Co, Pd, Sn, Bi, Se and Mo metal powder; and the lead mixture contains the components such as PbO particles and PbS compound particles with acore (PbS)-shell structure. The silver conductive paste has the advantages of good thixotropic property and good printing performance; and the silver electrode layer formed by the silver conductive paste has the advantages of good compactness, small series resistance and good ohmic contact property.

Description

technical field [0001] The invention relates to a silver conductor paste for front electrodes of crystalline silicon solar cells, which belongs to the technical field of new materials. Background technique [0002] In the solar cell manufacturing process, in order to draw out the photo-generated current, it is necessary to make electrodes on the surface of the cell. It is customary to call the electrode on the front side of the battery (illuminated side) the upper electrode, and the electrode on the back side of the battery as the lower electrode or back electrode. Screen printing and high-temperature sintering processes are commonly used to form electrodes on the battery surface, and the materials used to prepare electrodes are mainly silver conductor pastes composed of conductive phase silver powder, inorganic binder glass powder, organic vehicle and other additives. [0003] Silver conductor pastes for front electrodes of solar cells generally contain lead oxide. Accord...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 陈志鹏杨贵忠任进福许士燕
Owner JIANGSU HOYI TECH
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