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

A technology of solar cells and front electrodes, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems such as affecting the conductivity of grid lines and loose sintered film structure of nano-silver powder, etc. To achieve the effect of improving conductivity, rheology and thixotropy, and improving compactness

Inactive Publication Date: 2011-08-17
XIAN INTAIN NEW ENERGY MATERIALS SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Nano-silver powder is generally used as the conductive phase in the front paste of crystalline silicon solar cells. Nano-silver powder has the advantage of being easy to sinter, but the structure of the sintered film of nano-silver powder is loose and has a large number of pores, which affects the conductivity of the grid line.

Method used

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  • Silver paste for positive electrode of crystalline silicon solar cell and preparation method thereof

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Embodiment 1

[0025] A crystalline silicon solar photovoltaic cell front electrode silver paste, the composition and weight percentage are: 80% of Ag powder, 3.5% of glass powder, and 16.5% of organic vehicle.

[0026] The tap density of the above silver powder is 3.6g / cm 3 , the average particle size is 2.0 μm, and the particle size range of Ag powder is D50 1.3, D90 2.3 μm;

[0027] The composition and weight percentage of glass frit are 50% PbO, 30% SiO 2 , 10% Bi 2 o 3 , 1% Al 2 o 3 , 2.5% of V 2 o 5 , 5% ZnO, 1% silver oxide, 0.5% magnesium oxide. The softening point of the glass powder is 450°C, the average particle size of the powder is 1.5 μm, and the D90 is not more than 10 μm;

[0028] The binder in the organic vehicle is ethyl cellulose (5%); the organic solvent is selected from terpineol (40%), tributyl citrate (10%), butyl carbitol acetate (20%), Dibutyl phthalate (15%); additives selected from modified polyamide waxes (5%), modified hydrogenated castor oil (3%), dieth...

Embodiment 2

[0037]A silver paste for the front electrode of a crystalline silicon solar photovoltaic cell comprises the following composition and weight percent: 85% of Ag powder, 5.5% of glass powder, and 9.5% of organic vehicle.

[0038] The tap density of the above silver powder is 4.0g / cm 3 , the average particle size is 2.0 μm, and the particle size range of Ag powder is D50 1.3, D90 2.3 μm;

[0039] The composition and weight percentage of glass frit are 59% PbO, 19% SiO 2 , 5% Bi 2 o 3 , 3% Al 2 o 3 , 5% of V 2 o 5 , 3% ZnO, 3% silver oxide, 3% magnesium oxide; the softening point of the glass powder is 450°C, the average particle size of the powder is 1.5 μm, and the D90 is not more than 10 μm;

[0040] The binder in the organic vehicle is ethyl cellulose (5%), epoxy resin (2.5%); the organic solvent is selected from terpineol (60%), butyl carbitol acetate (10%), phthalate Dibutyl diformate (15%); additives selected from modified polyamide wax (3.5%), modified hydrogenated...

Embodiment 3

[0043] A silver paste for the front electrode of a crystalline silicon solar photovoltaic cell, the composition and weight percent of which are: 87% of Ag powder, 3.5% of glass powder, and 9.5% of organic vehicle.

[0044] The tap density of the above silver powder is 4.3g / cm 3 , the average particle size is 2.0 μm, and the particle size range of Ag powder is D50 1.3, D90 2.3 μm;

[0045] The composition and weight percentage of glass frit is 45% PbO, 20% SiO 2 , 5% Bi 2 o 3 , 3% Al 2 o 3 , 5% of V 2 o 5 , 7% ZnO, 5% silver oxide, 3.5% magnesium oxide, 2% TiO 2 , 1% CaO, 1% Na 2 O, 2.5% P 2 o 5 ; The softening point of the glass powder is 440°C, the average particle size of the powder is 1.5 μm, and the D90 is not more than 10 μm;

[0046] The binder in the organic vehicle is ethyl cellulose (5%); the organic solvent is selected from terpineol (40%), tributyl citrate (10%), triethanolamine (20%), lecithin (15%) ); additives are selected from modified polyamide wax ...

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Abstract

The invention discloses high-conductivity silver paste for a positive electrode of a crystalline silicon solar cell. The silver paste comprises the following components in percentage by weight: 75-90% of Ag powder, 2-10% of glass powder and 5-20% of organic carrier, wherein the glass powder comprises the following components in percentage by weight: 30-75% of PbO, 7-30% of SiO2, 2-30% of Bi2O3, 1-5% of Al2O3, 1-5% of V2O5, 1-10% of ZnO, 1-5% of Ag2O and 1-8% of MgO. The silver paste has the following beneficial effects: the micron-sized silver powder is adopted to prepare the silver paste, the prepared silver paste has good rheological behavior and thixotropy, a single wafer consumes less silver paste, and the compactness of the positive grid line is improved, thus improving the conductivity; and the glass powder with low-melting erosion property is adopted and can effectively and moderately erode the antireflective film, thus reducing the contact resistance of the crystalline silicon solar cell and improving the conversion efficiency.

Description

technical field [0001] The invention relates to a front electrode silver paste of a crystalline silicon solar photovoltaic cell and a preparation method thereof, and belongs to the technical field of high-performance solar electronic paste preparation. Background technique [0002] Energy and environment are two basic issues facing human society. Most of the energy on the earth comes directly or indirectly from solar energy, and solar energy can be regarded as an inexhaustible and inexhaustible clean energy. When non-renewable energy sources such as electricity, coal, and oil are running out frequently, and energy issues have increasingly become a bottleneck restricting the development of the international society and economy, more and more countries have begun to implement the "Sunshine Plan" to develop solar energy resources and seek new impetus for economic development. Driven by the huge potential of the international photovoltaic market, the solar cell manufacturing in...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 王惠齐学亮刘召
Owner XIAN INTAIN NEW ENERGY MATERIALS SCI & TECH
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