Inorganic adhesive for aluminum paste of silicon solar cells and preparation method thereof

A technology for silicon solar cells and inorganic adhesives, applied in the directions of inorganic adhesives, adhesives, circuits, etc., can solve the problems of large bending, low cohesion, and high sintering temperature of the battery sheet, reduce surface tension, and process methods. Simple, increased wetting effect

Active Publication Date: 2009-10-14
WUXI RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass powder has the function of adjusting the sintering temperature of the aluminum paste. A higher softening point means that the sintering temperature of the aluminum paste is high, which may cause the breakdown of the p-n junction of some solar cells and increase the probability of solar cell failure.
[0006] (2) The aluminum paste is printed on the back of the silicon wafer, and after drying and firing, the expansion coefficient of the molten glass layer formed is high, and the expansion coefficient of the molten glass layer measured according to the GB/T 16920-1997

Method used

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  • Inorganic adhesive for aluminum paste of silicon solar cells and preparation method thereof
  • Inorganic adhesive for aluminum paste of silicon solar cells and preparation method thereof
  • Inorganic adhesive for aluminum paste of silicon solar cells and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] The composition of the inorganic binder is: by mass parts SiO 2 14%, B 2 o 3 20%, Al 2 o 3 10%, Bi 2 o 3 25%, ZrO 2 13%, ZnO 15%, MoO 3 3%, the above-mentioned composition is as shown in Example 1 in Table 1, and the components in Table 1 are mass percentages.

[0032] Inorganic binder preparation steps: Put the above components into a mixer and mix them evenly, put them into a porcelain crucible, dry them in an oven at 145°C for 3.5 hours, put them in a high-temperature furnace, melt them at 850°C for 1 hour, and then dry them after water quenching Dry, use a planetary ball mill to mill to a size below 10 μm, and dry to obtain the finished inorganic adhesive for aluminum paste for silicon solar cells. The above-mentioned preparation process conditions are shown in Example 1 in Table 2.

[0033] Inorganic binder performance test:

[0034] According to ASTM C338-199 standard, the softening point is 555°C with SP1000 glass softening point tester, and the ex...

Embodiment 2- Embodiment 5

[0047] The component amounts of the inorganic binder, the preparation steps and the test results related to the performance indicators of the inorganic binder of the present invention are shown in Table 1, Table 2 and Table 3 respectively, and the description of the rest of the process is the same as that of Example 1.

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Abstract

The invention provides inorganic adhesive for the aluminum paste of silicon solar cells and a preparation method thereof. The inorganic adhesive comprises the following components by the weight part: 10% to 20% of SiO2, 15% to 30% of B2O3, 5% to 15% of Al2O3, 15% to 35% of Bi2O3, 10% to 18% of ZrO2, 10% to 25% of ZnO and 1% to 8% of MoO with the total amount being 100%. The preparation method comprises the following steps: putting the components forming the inorganic solvent into a mixer to mix the components uniformly; loading the mixed components into a porcelain crucible and placing the porcelain crucible into a baking oven to be dried at the temperature of 120 to 150 DEG C for 3 to 5 hours; then, placing the porcelain crucible into a high-temperature furnace to melt at the temperature of 800 to 1,100 DEG C for melting for 1 to 2 hours; carrying out water-quenching and oven-drying; milling the components with a planetary ball mill until the particle size is lower than 10 mum; and oven-drying the components to obtain the final product of the inorganic adhesive. The glass powder has lower softening temperature and high adhesion when the aluminum paste prepared from the inorganic solvent is used for sintering, so that the aluminum powder layer can be firmly adhered to silicon chips; the expansion coefficient is lower after sintering; the bending degree of cell chips is lower; and the breakage rate is reduced.

Description

technical field [0001] The invention relates to crystalline silicon solar cells, in particular to an inorganic binder for aluminum paste of silicon solar cells and a preparation method thereof. Background technique [0002] In the preparation process of crystalline silicon solar cells, the aluminum paste is printed on the back of the silicon wafer, and after sintering, the aluminum back electric field electrode is formed on the back of the silicon wafer of the solar cell, which can reduce the contact resistance and improve the photoelectric conversion efficiency of the cell. [0003] Aluminum paste is mainly composed of aluminum powder, organic binder, inorganic binder and additives. Among them, the aluminum powder is a conductive phase, which forms a good ohmic contact with the silicon chip after sintering; among them, the organic binder is used as a carrier to make the aluminum powder, glass powder, additives and other solid powders in the aluminum paste easy to agglomerat...

Claims

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Application Information

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IPC IPC(8): C09J1/00H01L31/18H01L31/0224
CPCY02P70/50
Inventor 毛毅强蔡纪法夏国锐丁冰冰
Owner WUXI RUXING TECH DEV
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