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Glass powder for PERC aluminum paste and preparation method

A technology of glass powder and aluminum paste, which is applied in the field of low-temperature glass powder for photovoltaic paste, which can solve the problems of increased contact resistance, decreased fill factor, aluminum back field voids, etc., and achieves low corrosion, good wettability and adhesion Good effect of property and melt leveling

Active Publication Date: 2019-11-08
JIANGSU HOYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the local metallization process on the back of the conventional conductive aluminum paste, since the content of bismuth oxide and lead oxide, which are highly corrosive to the passivation film in the components, is about 50%, it has a strong damage effect on the passivation film. Therefore, you will encounter the problem of voids in the aluminum back field, that is, the local metal contact area does not form an aluminum back field, and silicon dissolves into aluminum to form voids, which will cause an increase in contact resistance and a decrease in fill factor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the embodiment of the present invention, the raw materials of the glass powder include by weight: 10% of bismuth oxide, 24% of boron oxide, 26% of vanadium pentoxide, 6% of zinc oxide, 24% of barium oxide, and 3% of calcium oxide , aluminum phosphate 5%, aluminum oxide 2%.

[0027] The preparation of the organic binder comprises the following steps:

[0028] (1) Weigh each component according to the proportioning amount;

[0029] (2) Add the required raw materials into the mixer and mix for 20 minutes to prepare a mixed powder. Put the mixed powder into a quartz crucible and put it into an oven for baking. The baking temperature is controlled at 200°C and the baking time is 2 hours. ;

[0030] (3) Put the above-mentioned material powder into a muffle furnace for melting, the temperature is 1100°C, the holding time is 1h, and melted into molten glass;

[0031] (4) Pour the molten glass into pure water at 25°C, quench in water to obtain glass particles, and dry at 1...

Embodiment 2

[0039] The raw materials of the glass powder include by weight: 8% bismuth oxide, 4% lead oxide, 22% boron oxide, 27% vanadium pentoxide, 5% zinc oxide, 25% barium oxide, 2% magnesium oxide, phosphoric acid Zinc 4%, Aluminum Oxide 3%.

[0040] The preparation of the organic binder comprises the following steps:

[0041] (1) Weigh each component according to the proportioning amount;

[0042] (2) Add the required raw materials into the mixer and mix for 20 minutes to prepare a mixed powder. Put the mixed powder into a quartz crucible and put it into an oven for baking. The baking temperature is controlled at 200°C and the baking time is 2 hours. ;

[0043] (3) Put the above-mentioned material powder into a muffle furnace for melting at a temperature of 1050° C. for 1 hour to melt into molten glass;

[0044] (4) Pour the molten glass into pure water at 25°C, quench in water to obtain glass particles, and dry at 150°C;

[0045] (5) Put the dried glass particles into the ball ...

Embodiment 3

[0051] The raw materials of the glass powder include by weight: 5% bismuth oxide, 6% lead oxide, 26% boron oxide, 21% vanadium pentoxide, 8% zinc oxide, 23% barium oxide, 3% calcium oxide, phosphoric acid Zinc 6%, Aluminum Oxide 2%.

[0052] The preparation of the organic binder comprises the following steps:

[0053] (1) Weigh each component according to the proportioning amount;

[0054](2) Add the required raw materials into the mixer and mix for 20 minutes to prepare a mixed powder. Put the mixed powder into a quartz crucible and put it into an oven for baking. The baking temperature is controlled at 200°C and the baking time is 2 hours. ;

[0055] (3) Put the above-mentioned material powder into a muffle furnace for melting at a temperature of 1050° C. for 1 hour to melt into molten glass;

[0056] (4) Pour the molten glass into pure water at 25°C, quench in water to obtain glass particles, and dry at 150°C;

[0057] (5) Put the dried glass particles into the ball mil...

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Abstract

The invention discloses a glass powder for PERC aluminum paste and a preparation method. The glass powder comprises the following raw materials by weight percentage: 5-15% of bismuth oxide, 0% or 5%-10% of lead oxide, 20-30% of boron oxide, 20-30% of vanadium pentoxide, 3-10% of zinc oxide, 15-25% of barium oxide, 0-5% of calcium oxide and / or magnesium oxide, 0.6% of aluminum phosphate and / or zincphosphate, and 0.3% of aluminum oxide. Through reasonable matching of different components, the melt formed by the melting of prepared glass powder has good leveling properties, good wettability andcohesiveness to a silicon substrate and aluminum powder, and little corrosiveness to a passivation film on the back of a PERC battery piece, can guarantee excellent adhesion without affecting the passivation effect, and can significantly improve the photoelectric conversion efficiency of solar PERC batteries.

Description

technical field [0001] The invention relates to low-temperature glass powder for photovoltaic paste, in particular to a glass powder for PERC aluminum paste and a preparation method. Background technique [0002] The core difference between PERC and conventional photovoltaic cells is to increase the conversion efficiency by adding a passivation film on the back. PERC cells maximize the potential gradient across the P-N junction, which enables a more stable flow of electrons and reduces electron recombination for higher efficiency levels. [0003] The metallization process of PERC cells can still use the screen printing process, but the back structure of PERC cells has changed due to the addition of a passivation layer. Therefore, the performance of the conductive paste is different from that of conventional battery pastes. In the local metallization process on the back of the conventional conductive aluminum paste, since the content of bismuth oxide and lead oxide, which ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00
CPCC03C12/00
Inventor 徐颖杰王茂杨波舒华富
Owner JIANGSU HOYI TECH
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