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Paste for back aluminum grid line printing, preparation method thereof, and solar cell

A technology of solar cells and grid lines, applied in the field of solar cells, can solve the problems of increasing battery resistance, affecting the photoelectric conversion efficiency of batteries, etc., and achieve the effects of reducing resistance, facilitating printing of aluminum grid lines, and excellent ohmic contact performance

Active Publication Date: 2019-04-23
TIANJIN AIKO SOLAR ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the contact area between the aluminum grid and the back of the battery is small, it is bound to increase the resistance of the battery and affect the photoelectric conversion efficiency of the battery

Method used

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  • Paste for back aluminum grid line printing, preparation method thereof, and solar cell
  • Paste for back aluminum grid line printing, preparation method thereof, and solar cell
  • Paste for back aluminum grid line printing, preparation method thereof, and solar cell

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preparation example Construction

[0043] Correspondingly, the present invention also provides a method for preparing a paste for back aluminum grid line printing, including:

[0044] Add lead-free glass powder and aluminum powder to the organic vehicle according to the formula, and disperse with a dispersing tool at 500-1000rpm for 1-3h;

[0045] Roll the dispersed mixed liquid with a grinder to an aluminum paste with a fineness of ≤20 μm and a viscosity of 40-120 Pa.s.

[0046] Correspondingly, the present invention also provides a P-type PERC double-sided solar cell using the above-mentioned back electrode structure, specifically as figure 1 As shown, it includes a back silver main gate 1, an aluminum gate line 2, a back passivation layer, a P-type silicon 5, an N-type emitter 6, a front passivation layer 7 and a front silver electrode 8, wherein the back passivation layer includes The silicon nitride film 3 on the back, the aluminum oxide film 4 on the back, and the passivation layer 7 on the front can be ...

Embodiment 1

[0060] Formula: 75 parts of aluminum powder, 2 parts of lead-free glass powder, 23 parts of organic carrier;

[0061] Among them, the aluminum powder is a spherical aluminum powder with a purity of 99.9% and 2 μm;

[0062] The organic vehicle contains 25% butyl carbitol and 75% butyl carbitol acetate;

[0063] Lead-free glass powder contains: ZnO 20%, Bi 2 o 3 45%, H 2 B 2 o 4 10%, BaCO 3 15%, SiO 2 3.5%, CaCO 3 3%, Al 2 o 3 1.5%, MoO 1%, BeO 1%.

[0064] Preparation:

[0065] Add lead-free glass powder and aluminum powder to the organic vehicle according to the formula, and disperse with a dispersing tool at 500rpm for 3h;

[0066] Roll the dispersed mixed liquid with a grinder to an aluminum paste with a fineness ≤ 20 μm and a viscosity of 60 Pa.s.

Embodiment 2

[0068] Formula: 80 parts of aluminum powder, 5 parts of lead-free glass powder, 15 parts of organic carrier;

[0069] Among them, 12% of 1-2μm spherical aluminum powder, 40% of 4-5μm spherical aluminum powder and 48% of 2-4μm spherical aluminum powder;

[0070] The organic vehicle contains 50% butyl carbitol and 50% butyl carbitol acetate;

[0071] Lead-free glass powder contains: ZnO 30%, Bi 2 o 3 30%, H 2 B 2 o 4 14%, BaCO 3 18%, SiO 2 3%, CaCO 3 2%, Al 2 o 3 1%, MoO 1%, BeO 1%.

[0072] Preparation:

[0073] Add lead-free glass powder and aluminum powder to the organic vehicle according to the formula, and disperse with a dispersing tool at 600rpm for 2h;

[0074] Roll the dispersed mixed liquid with a grinder to an aluminum paste with a fineness of ≤20 μm and a viscosity of 95 Pa.s.

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Abstract

The invention discloses a back aluminum grid line printing paste and a preparation method thereof. The back aluminum grid line printing paste comprises 75-95 parts of aluminium powder, 2-8 parts of leadless glass powder, and 5-23 parts of an organic carrier; wherein the purity of aluminium powder is larger than 99.0%, and the aluminium powder is 1-5 [mu]m spherical aluminium powder; the organic carrier contains 20-75% butyl carbitol and 25-80% of butyl carbitol acetat; and the leadless glass powder contains 20-60% of ZnO, 10-45% of Bi2O3, 10-30% of H2B2O4, 15-20% of BaCO3, 0.5-3.5% of SiO2, 0.5-3% of CaCO3, 0.5-2.5% of Al2O3, 1-8% of MoO and 1-5% of BeO. According to the invention, the paste has a relatively-high viscosity, the aluminum grid line obtained by printing has a good depth-width ratio, the resistance of the cell can be reduced, and the photoelectric conversion efficiency of the cell is improved.

Description

technical field [0001] The present invention relates to the field of solar cells, in particular to a paste for printing back aluminum grid lines, a preparation method of the above paste for back aluminum grid line printing, and a solar cell made by using the above paste for back aluminum grid line printing. Background technique [0002] Solar cell power generation is the use of solar cells to directly convert sunlight energy into electrical energy. Because it is a green product, it will not cause environmental pollution, and it is a renewable resource. Therefore, in today's energy shortage situation, solar cells are an effective A new type of energy with broad development prospects. [0003] With the rapid growth of the solar photovoltaic industry, the demand for electronic paste will also increase rapidly, especially the high-temperature sintered thick-film electronic aluminum paste, which is the main paste used for solar cell electrodes at present. In the future, thick-fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224H01L31/068
CPCH01B1/22H01B13/00H01L31/022425H01L31/0684Y02E10/547
Inventor 方结彬何达能陈刚
Owner TIANJIN AIKO SOLAR ENERGY TECH CO LTD