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Sliver electrode slurry for back electric field of silicon solar cell and preparation method thereof

A silicon solar cell, silver electrode technology, applied in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc. Problems such as point contact, to achieve good solder resistance, uniform electrical properties, and ensure the effect of adhesion

Active Publication Date: 2012-02-15
ZHEJIANG GUANGDA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the glass binder used in the silver electrode or silver-aluminum electrode paste for back electric field produced by paste companies at home and abroad is basically a glass with a single low softening point. This glass has a low melting point and flows when sintered at high temperature. It has good wettability with the surface of the silicon wafer and has a lot of penetration into the interior of the silicon wafer. Although good adhesion can be obtained, it may cause the contact between the metal silver powder and the surface of the silicon wafer to change from surface contact to point contact, which seriously affects Photoelectric conversion efficiency
On the other hand, due to more glass phase penetration, the glass phase change on the surface of the silver electrode may be less, which makes the solder resistance of the silver electrode worse.

Method used

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  • Sliver electrode slurry for back electric field of silicon solar cell and preparation method thereof
  • Sliver electrode slurry for back electric field of silicon solar cell and preparation method thereof

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Embodiment 1-9

[0024] A silver electrode paste for the back electric field of a silicon solar cell, the formula of which is in accordance with No. 1-9 formulas in Table 1 (respectively corresponding to Examples 1-9), and can be dispersed after processing such as component adjustment, ball milling, and rolling. The main material with good performance and uniform composition. The metal conductive powder described in the formula is composed of spherical silver powder with a particle size of 0.5-2.5 μm and a tap density above 4.5 g / ml, and flake silver powder with a particle size of 5 μm or less and a tap density above 4.0 g / ml. The glass binder is a Bi 2 o 3 -B 2 o 3 - SiO 2 The low-temperature softening point glass of the system and a PbO 3 -B 2 o 3 - SiO 2 -High-temperature softening point glass of ZnO system. The polymer resin in the organic binder is one or more of ethyl cellulose, hydrogenated rosin resin, and polyurethane resin, and the solvent is terpineol, butyl acetate or One...

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Abstract

The invention discloses sliver electrode slurry for a back electric field of a silicon solar cell and a preparation method thereof, and the silver electrode slurry for the back electric field of the silicon solar cell comprises the following components by weight percent: 60-70% of spherical silver powder, 0-5% of flaky silver powder, 2-6% of glass powder with a high-temperature softening point, 1-3% of glass powder with a low-temperature softening point and 20-30% of organic bonding agent. The particle size of the spherical silver powder is 0.5-2.5 mu m, and the tap density is above 4.5g / ml; the particle size of the flaky silver powder is below 5 mu m, and the tap density is above 4.0g / ml; and the glass powder with the high-temperature softening point is a PbO3-B2O3-SiO2-ZnO glass system, and the glass powder with the low-temperature softening point is a Bi2O3-B2O3-SiO2 glass system. The slurry is applied to a sliver electrode of the back electric field of the silicon solar cell; furthermore, after fast high-temperature sintering by a chained belt furnace, the adhesive capability is strong, the soldering resistance is good and the photoelectric conversion efficiency of a product is high.

Description

technical field [0001] The invention relates to a silver electrode paste for a back electric field of a silicon solar cell and a preparation method thereof, belonging to the technical field of electronic materials. Background technique [0002] With the rapid development of modern industry, on the one hand, the demand for energy is increased, causing an energy crisis; on the other hand, a large amount of carbon dioxide gas is released in the use of conventional energy, leading to a global "greenhouse effect". As the most ideal renewable energy, solar energy has the characteristics of "inexhaustible and inexhaustible", and the use of solar energy to generate electricity has the advantages of environmental protection, low cost, and high efficiency, and there is no need to consider its safety issues. In recent years, domestic silicon solar cells have developed rapidly, and the production capacity of my country alone in 2010 has exceeded 5GW. Therefore, the amount of solar paste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 孟淑媛黄月剑
Owner ZHEJIANG GUANGDA ELECTRONICS TECH
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