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A kind of lead-free conductive paste for back electrode of crystalline silicon solar cell and preparation method thereof

A technology for solar cells and back electrodes, which is applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc. Reduced production cost, increased bulk density, and improved stability

Active Publication Date: 2016-01-06
SHANGHAI BONA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the action of DC bias, pure silver is prone to migration of silver ions, resulting in a decrease in mechanical strength, and serious circuit short circuit, which greatly reduces the safety factor of the application.
And silver is a precious metal, the price is expensive, and the price of silver paste is high
[0005] At present, the glass binder used in the conductive silver paste of solar cells is a lead-containing mixed glass powder. Although this glass system has the advantages of low softening temperature and stable electrical properties, the conductive paste produced with this glass system contains Lead, which pollutes the environment more and does not meet environmental protection requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Metal conductive phase: use spherical silver-plated copper powder (the content of copper is 10wt%, and the content of silver is 90wt%), particle size D50=1μm.

[0033] Preparation of inorganic lead-free glass powder: take each component by weight percentage (total 100wt%): Bi 2 o 3 : 60wt% - , B 2 o 3 : 20wt%, SiO2: 15wt%, TiO2: 5wt%; then put it into a quartz crucible and keep it warm at 1000°C for 2h, water quenching and drying, and ball milling for 1.5h to obtain inorganic lead-free glass powder with a particle size of D50=2μm; The softening temperature is 250°C.

[0034] Preparation of organic vehicle: Weigh each component according to the following weight percentages (total 100wt%): 50wt% terpineol, 37wt% butyl carbitol, 8wt% ethyl cellulose, 3wt% phthalate Dibutyl formate, 2wt% octanoic acid; first add terpineol, butyl carbitol, dibutyl phthalate and octanoic acid into a glass reactor, then add ethyl alcohol under 15m / s high-speed shear The cellulose was hea...

Embodiment 2

[0037] Metallic conductive phase: use flake-shaped silver-plated copper powder (the content of copper is 25wt%, and the content of silver is 75wt%), particle size D50=2.5μm.

[0038] Preparation of inorganic lead-free glass powder: take each component by weight percentage (total 100wt%): Bi 2 o 3 : 65wt%, B 2 o 3 : 25wt%, SiO 2 : 8.5wt%, TiO 2 : 1.5wt%; then put it into a quartz crucible and keep it warm at 1000°C for 2h, water quench and dry, then ball mill for 1.5h to obtain inorganic lead-free glass powder with a particle size of D50=4μm; the softening temperature is 350°C.

[0039]Preparation of organic vehicle: Weigh each component according to the following weight percentages (total 100wt%): 40wt% turpentine, 30wt% tributyl citrate, 10wt% lauryl alcohol, 6wt% ethyl cellulose, 6wt% % nitrocellulose, 5wt% hydrogenated castor oil, 3wt% lecithin; first turpentine, tributyl citrate, lauryl alcohol, hydrogenated castor oil and lecithin were added to the glass reactor, and...

Embodiment 3

[0042] Metallic conductive phase: select rod-shaped silver-plated copper powder (the content of copper is 15wt%, and the content of silver is 85wt%), particle size D50=3.5μm.

[0043] Preparation of inorganic lead-free glass powder: take each component by weight percentage (total 100wt%): 70wt% Bi 2 o 3 , 15wt% B 2 o 3 , 10wt% SiO 2 and 5wt% TiO 2 ; Then put it into a quartz crucible and keep it warm at 1400°C for 1h, water quench and dry it, then ball mill it for 3h to get inorganic lead-free glass powder with a particle size of D50=2μm; the softening temperature is 450°C.

[0044] Preparation of organic vehicle: Weigh each component according to the following weight percentage (total 100wt%): 80wt% terpineol, 8wt% acrylic resin, 10wt% epoxy resin, 3wt% dibutyl phthalate , first add terpineol and dibutyl phthalate into the glass reactor, then add acrylic resin and epoxy resin under high-speed shearing at 20m / s, heat to 85°C and keep warm for 200min under high-speed shear...

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Abstract

The invention relates to lead-free electrocondution slurry used for a crystalline silicon solar cell back electrode. The lead-free electrocondution slurry used for the crystalline silicon solar cell back electrode consists of the following components in percentage by weight: 40-70wt% of silver plating copper powder, 2-10wt% of inorganic lead-free glass powder and 25-50wt% of organic carrier, wherein the organic carrier is the mixture of solvent, thickening agent and additive, and the prepared electrocondution slurry printing back electrode has the advantages of big thickness, small bulk resistance, excellent soldering resistance, strong welding adhesive force and silver ion migration resistance. Meanwhile, after cell pieces are subjected to series welding, an assembly has the advantages of higher stability and stronger anti-aging capability.

Description

technical field [0001] The invention relates to a lead-free conductive paste for back electrodes of crystalline silicon solar cells and a preparation method thereof, belonging to the field of conductive pastes for solar cells. Background technique [0002] After several years of rapid development of crystalline silicon solar cells, the price of the cells has dropped significantly, but subsidies are still needed, and solar cell power generation cannot yet compete with traditional thermal power generation. Therefore, cost reduction is still the primary problem facing crystalline silicon solar cells. As the price of silicon materials decreases, the proportion of silver paste in the cost of cell manufacturing rises to more than 10%, accounting for more than 40% of non-silicon costs. Therefore, more and more cell manufacturers focus on reducing costs. Reduced silver usage. [0003] The front electrode of the cell is mainly used to collect electrons and flow them out of the batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
Inventor 涂小平郑建华敖毅伟杨云霞袁晓
Owner SHANGHAI BONA ELECTRONICS TECH
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