Lead-free glass powder for aluminium paste of solar cell

A technology for solar cells and lead-free glass powder, which is applied in the field of lead-free glass powder for aluminum paste of solar cells and its preparation field, can solve the problem of insufficient wettability and stability of glass powder, affecting the performance and life of battery cells, and silicon oxide group It can improve the chemical stability and mechanical properties, uniform properties and small particle size.

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

AI Technical Summary

Problems solved by technology

The Chinese patent that application number is 201010118869.8 discloses a kind of lead-free glass powder for solar cell aluminum paste, and its content of bismuth oxide is as high as 30-60%, and its shortcoming is: the high content of bismuth oxide component easily leads to bismuth component Overburn with the silicon substrate and enter the silicon substrate, affecting the performance and life of the battery
The Chinese patent application number 200910027899.5 discloses a lead-free glass frit with low bismuth oxide content. The bismuth oxide content in the glass frit is 15-35%, but the silicon oxide component content is low and the boron oxide component content is high. , and also contains alumina components; the wettability and stability of the glass powder are insufficient, and the softening temperature is high

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A lead-free glass powder for aluminum paste of solar cells, the composition and the weight percentage thereof are: bismuth oxide 28%, boron oxide 15%, silicon oxide 29%, zinc oxide 16.5%, calcium oxide 10%, antimony oxide 1%, Tin oxide 0.5%. Among them, the median particle size of the glass powder is less than 2 μm, and the maximum particle size is less than 5 μm; the softening temperature of the glass powder is 400-550 °C.

[0013] The preparation method of the lead-free glass powder for the above-mentioned solar cell aluminum paste is as follows: mixing bismuth oxide, boron oxide, silicon oxide, zinc oxide, calcium oxide, antimony oxide and tin oxide in a ball mill mixer according to the above ratio; The obtained oxide mixed powder is sieved, and the mesh number of the sieve is not less than 100 meshes; the sieved oxide powder is selected at 1200-1500 o Heat and melt in a resistance furnace at C, and keep the temperature for more than 15 minutes to obtain glass liqui...

Embodiment 2

[0015] A lead-free glass powder for solar cell aluminum paste, the composition and the weight percentage thereof are: bismuth oxide 20%, boron oxide 5%, silicon oxide 21%, zinc oxide 30%, calcium oxide 9%, antimony oxide 10%, Tin oxide 5%. Among them, the median particle size of the glass powder is less than 2 μm, and the maximum particle size is less than 5 μm; the softening temperature of the glass powder is 400-550 °C.

[0016] The preparation method of the lead-free glass powder for the above-mentioned solar cell aluminum paste is as follows: mixing bismuth oxide, boron oxide, silicon oxide, zinc oxide, calcium oxide, antimony oxide and tin oxide in a ball mill mixer according to the above ratio; The obtained oxide mixed powder is sieved, and the mesh number of the sieve is not less than 100 meshes; the sieved oxide powder is selected at 1200-1500 o Heat and melt in a resistance furnace at C, and keep the temperature for more than 15 minutes to obtain glass liquid; quickl...

Embodiment 3

[0018] A lead-free glass powder for solar cell aluminum paste, the composition and the weight percentage thereof are: bismuth oxide 28%, boron oxide 14.5%, silicon oxide 29%, zinc oxide 5%, calcium oxide 9.5%, antimony oxide 9.5%, Tin oxide 4.5%. Among them, the median particle size of the glass powder is less than 2 μm, and the maximum particle size is less than 5 μm; the softening temperature of the glass powder is 400-550 °C.

[0019] The preparation method of the lead-free glass powder for the above-mentioned solar cell aluminum paste is as follows: mixing bismuth oxide, boron oxide, silicon oxide, zinc oxide, calcium oxide, antimony oxide and tin oxide in a ball mill mixer according to the above ratio; The obtained oxide mixed powder is sieved, and the mesh number of the sieve is not less than 100 meshes; the sieved oxide powder is selected at 1200-1500 o Heat and melt in a resistance furnace at C, and keep the temperature for more than 15 minutes to obtain glass liquid;...

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Abstract

The invention relates to a lead-free glass powder for the aluminium paste of a solar cell and a preparation method for the same. The lead-free glass powder comprises the following components in percentage by weight: 20-29% of bismuth oxide, 5-15% of boron oxide, 21-39% of silicon oxide, 5-30% of zinc oxide, 1-10% of calcium oxide, 1-10% of antimony oxide and 0.5-5% of tin oxide, wherein the total of the percentages by weight of the raw material components is 100%; the median particle diameter of the glass powder is 2 mum, and the maximum particle diameter of the glass powder is 5 mum; and the softening temperature of the glass powder is 400-550 DEG C. Compared with the prior art, the lead-free glass powder for the aluminium paste of a solar cell disclosed by the invention is low in the content of the bismuth oxide component, high in the contents of the silicon oxide component and the boron oxide component, good in wettability with a silicon substrate, and capable of forming good bonding with the silicon substrate; and moreover, the glass powder is capable of avoiding damages on the substrate due to the over-reaction of the glass powder and the silicon substrate during sintering, beneficial to the epitaxial growth of the silicon substrate to form a P+ layer, and capable of increasing the electric performance of the cell slice.

Description

technical field [0001] The invention relates to a glass powder for electronic paste, in particular to a lead-free glass powder for aluminum paste of solar cells and a preparation method thereof. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. The aluminum back electric field is an important component of the solar cell, which can reduce the contact resistance and improve the photovoltaic efficiency of the cell. The aluminum back electric field is formed by printing aluminum paste on the back of the silicon substrate and then sintering at high temperature; the aluminum paste is mainly composed of aluminum powder and / or its alloy, organic binder, glass powder, and additives. Among them, the glass powder binds the aluminum film and the silicon substrate together during sintering, and acts as an adhesive. In order to reduce the contact resistance between the aluminum back field and the silicon wafer and imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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