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Front gate line electrode silver conductor slurry for environment friendly silicon solar cell

An environment-friendly silver paste technology, which is applied in the direction of conductors, conductive materials dispersed in non-conductive inorganic materials, conductive materials, etc., can solve the adverse effects of production and use, phosphorus (P) element poisoning, high lead content in paste, etc. problem, to achieve the effect of reducing contact resistance, excellent photoelectric conversion performance, and good conductivity

Active Publication Date: 2009-07-15
河北晶乐光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lead content in the slurry is very high, and its use has caused very large pollution to the environment
However, bismuth-boron series and zinc-boron lead-free glass are inferior to lead glass in terms of high temperature fluidity, glass and substrate wettability, etc., so it is necessary to find a lead-free glass suitable for silicon solar cells. Frit is a problem
At the same time, the ohmic contact between the silver wire and the n-type silicon surface is also a technical problem. In the existing technology, phosphorus (P) element is generally added to the slurry, but phosphorus (P) element is poisonous and harmful to production and use. influences

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A kind of environment-friendly type solar cell front grid line electrode silver conductor paste (preparation 100g), its production process is as follows:

[0060] 1. Glass binder formula (prepared 100g): BaO 35g, ZnO 25g, B 2 o 3 20g, SiO 2 5g, Al 2 o 3 5g, ZrO 2 2g,TiO 2 3g, Bi 2 o 3 1g, Na 2 O 2g, Li 2 O 2g.

[0061] 2. Glass melting and ball milling process: 1200°C, 60min, ball milling to less than 10μm after quenching.

[0062] 3. The weight percentage of spherical powder and flake powder is selected as metallic silver powder: spherical powder: flake powder = 60:40.

[0063] 4. Slurry preparation: weigh 70g of silver powder, 8g of glass powder, 3g of ohmic contact additive, 2g of organic resin, 15g of solvent, and 2g of slurry modifier, and stir and disperse evenly in the container, then perform three-roll grinding to control the slurry The viscosity of the slurry (at 25° C.) is 70-120 Pa.s, and the particle size of the slurry is less than 10 μm. ...

Embodiment 2

[0075] A kind of environment-friendly type solar cell front grid line electrode silver conductor paste (preparation 100g), its production process is as follows:

[0076] 1. Glass binder formula (prepared 100g): BaO 40g, ZnO 25g, B 2 o 3 15g, SiO 2 8g, Al 2 o 3 2g, ZrO 2 1g,TiO 2 2g, Bi 2 o 3 1g, Na 2 O 2g, Li 2 O 4g.

[0077] 2. Glass melting and ball milling process: 1250°C, 60min, ball milling to less than 10μm after quenching.

[0078] 3. The weight percentage of spherical powder and flake powder is selected as metallic silver powder: spherical powder: flake powder = 70:30.

[0079] 4. Slurry preparation: weigh 75g of silver powder, 6g of glass powder, 3g of ohmic contact additive, 2g of organic resin, 13g of solvent, and 1g of slurry modifier, and stir and disperse evenly in the container, then perform three-roll grinding to control the slurry The viscosity of the slurry (at 25° C.) is 70-120 Pa.s, and the particle size of the slurry is less than 10 μm. ...

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PUM

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Abstract

The invention relates to a formula of an environment-friendly Ag conductor slurry for a silicon solar cell front gate line electrode and a processing method thereof. The component and the content (weight percentage) of the Ag slurry are: a metal Ag powder 60-80, a lead-less glasses adhesive 1-10, an Ohm contact additive agent 0. 05-10, and organic resin 2-15and a slurry modifying agent 1-8 The production method of the environment-friendly Ag conductor slurry comprises a preparation of the lead-less glass adhesive, a formula of the Ag slurry and a processing process of the slurry. The developing Ag slurry implements the slurry lead-free by using a Ba-Zn-B glass material and the lead content of the slurry is less than 100 ppm, while the content of other harmful substances such as Hg and Cd or the like is all conformed to the environment protection demand. A good Ohm contact is formed on the silicon surface of the Ag line and the cell by adding the Ohm contact forming agent in the slurry. The Ag slurry has strong adhesive force, superior weldability, good Ohm contact and high cell conversion efficiency after a continuous tunnel furnace fast heat treatment when the Ag slurry is used in the silicon solar cell front gate line electrode.

Description

technical field [0001] The invention relates to a silver conductor paste used for front grid wire electrodes of silicon solar cells. After the paste passes through the production process, metal silver wires are formed on the front side of the silicon solar cells to lead out the current generated by the solar cells under light. The silver paste forms a grid line electrode on the front of the silicon solar cell through screen printing, drying, rapid sintering heat treatment and other processes. This grid line electrode has a small shielding surface for the sun's incident light. The surface forms a good ohmic contact, so that the battery sheet has a high photoelectric conversion efficiency. Background technique [0002] In silicon solar cell technology, electrode fabrication is a very important link. Commonly used electrode technologies include magnetron sputtering, vacuum evaporation, and screen printing. The screen printing process has the characteristics of low production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/0224H01B1/00H01B1/16H01B1/22
CPCY02P70/50
Inventor 范琳
Owner 河北晶乐光电科技有限公司
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