Solar cell front sliver paste powder adaptable to high sheet resistance and shallow junction

A solar cell and silver paste technology, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, can solve problems affecting the sintering of front-side silver paste, and achieve high photoelectric conversion efficiency and excellent electrode structure. Dense and consistent appearance

Active Publication Date: 2013-03-27
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the front-side silver paste powder materials currently used basically only optimize the powder gradation from the perspective of silver powder; in fact, both glass powder and inorganic additives affect the sintering of the front-side silver paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A powder material for front silver paste of solar cells suitable for high square resistance and shallow junction, its composition and weight percentage are: coarse silver powder with an average particle size of 2-5 μm 50%, fine silver powder with an average particle size of 0.5-2 μm Silver powder 45%, glass powder 4.9%, additive 0.1%. Among them, the thick and fine silver powders are all spherical or quasi-spherical, and the tap density is >5.5g / cm 3 The softening point of the glass powder is 380-480°C. The composition and weight percentage of the glass powder are: lead oxide 65%, aluminum oxide 5%, silicon oxide 10%, zinc oxide 10%, magnesium oxide 10%; glass powder has Bimodal particle size distribution, fine glass powder with an average particle size of less than 0.5 μm accounts for 10% by weight, and coarse glass powder with an average particle size of 0.5-5 μm accounts for 90%; the additive is tin, which has a bimodal particle size distribution , additives with an...

Embodiment 2

[0017] A powder material for front silver paste of solar cells suitable for high square resistance and shallow junction, its composition and weight percentage are: 75% of coarse silver powder with an average particle size of 2-5μm, fine silver powder with an average particle size of 0.5-2μm Silver powder 20%, glass powder 2%, additive 3%. Among them, the thick and fine silver powders are all spherical or quasi-spherical, and the tap density is >5.5g / cm 3 The softening point of the glass powder is 380-480°C. The composition and weight percentage of the glass powder are: 85% lead oxide, 5% aluminum oxide, 1% silicon oxide, 4% zinc oxide, and 5% magnesium oxide; the glass powder has Bimodal particle size distribution, fine glass powder with an average particle size of less than 0.5 μm accounts for 35% by weight, and coarse glass powder with an average particle size of 0.5-5 μm accounts for 65%; the additive is copper, which has a bimodal particle size distribution , additives wi...

Embodiment 3

[0019] A powder material for front-side silver paste of solar cells suitable for high square resistance and shallow junction, its composition and weight percentage are: 62% of coarse silver powder with an average particle size of 2-5 μm, fine silver powder with an average particle size of 0.5-2 μm Silver powder 27%, glass powder 9%, additive 2%. Among them, the thick and fine silver powders are all spherical or quasi-spherical, and the tap density is >5.5g / cm 3 The softening point of the glass powder is 380-480°C. The composition and weight percentage of the glass powder are: 81% lead oxide, 2% aluminum oxide, 9% silicon oxide, 1% zinc oxide, and 7% magnesium oxide; the glass powder has Bimodal particle size distribution, fine glass powder with an average particle size of less than 0.5 μm accounts for 15% by weight, and coarse glass powder with an average particle size of 0.5-5 μm accounts for 85%; the additive is nickel, which has a bimodal particle size distribution , addit...

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Abstract

The invention relates to solar cell front sliver paste powder adaptable to high sheet resistance and shallow junction. The powder comprises, by weight percent, 50-75% of coarse sliver powder 2-5 micrometers in average particle size, 20-45% of fine sliver powder 0.5-2 micrometers in average particle size, 1-9% of glass powder, and 0.1-3% of additive. The components are added up to 100% by weight percent. Both the glass powder and the additive are in twin-peak particle size distribution. Compared with the prior art, the front sliver paste powder is optimized by powder gradation. The glass powder and the additive are proper in particle size. Voids between the coarse and fine sliver powders can be effectively filled with the glass powder and the additive. After sintering, silver islands are small and evenly distributed, can form fine orphic contacts and are fine in appearance. The glass powder has moderate activity and does not disrupt P-N junctions. The front sliver paste made from the powder is suitable for sintering on shallow-junction silicon cells.

Description

technical field [0001] The invention relates to an electronic paste, in particular to a powder material for front silver paste of a solar cell suitable for high square resistance and shallow junction. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electricity. With the development of photovoltaic industry, high square resistance shallow junction has gradually become one of the development trends of solar cells. A silicon solar cell with a high square resistance shallow junction structure can reduce the recombination speed of minority carriers on the surface of the solar cell and improve the short-wave response, thereby improving the photoelectric conversion efficiency of the cell. Achieving a high square resistance shallow junction of a solar cell generally requires that the front silver paste used to make solar cell electrodes has a high sintering temperature. When ordinary silver paste is used for sintering on silicon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01L31/0224
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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