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Lead-free inorganic adhesive used in silver paste on crystalline silicon solar cell back, and preparation method thereof

An inorganic binder and solar cell technology, applied in the field of electronic paste, can solve the problems of affecting the electrical properties of crystalline silicon solar cells, weak corrosiveness, unfavorable silver-silicon alloy, lead environment and health hazards, etc., and achieves favorable particle size. Control, good bonding performance, and the effect of improving production efficiency

Active Publication Date: 2014-12-24
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The corrosiveness of the inorganic binder should be moderate. Too weak corrosiveness is not conducive to the formation of silver-silicon alloys. Too strong corrosiveness may affect the electrical properties of crystalline silicon solar cells.
[0004] Because lead oxide is an excellent flux, almost all the silver pastes on the back of solar cells used lead-containing inorganic binders in the past, but lead is harmful to the environment and health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] parts by mass SiO 2 8 copies, B 2 o 3 30 parts, Al 2 o 3 6 copies, Bi 2 o 3 32 copies, P 2 o 5 5 parts, ZnO 15 parts, TiO 2 1 part, ZrO 2 1 part and SnO 2 2 parts, put into the mixer, mix and disperse for 60 minutes, and let stand for 30 minutes. The premixed lead-free inorganic binder mixture was divided into corundum crucibles, placed in a digital blast drying oven, and dried at 120 °C for 180 min. The dried lead-free inorganic binder mixture was placed in a muffle furnace and melted at 1100°C for 65 minutes to form a uniform molten glass. Quickly pour the high-temperature molten glass into deionized water at 25 °C to quench to obtain block glass. The water-quenched glass block was dried at 140 °C, and the lead-free inorganic binder was crushed to 5 μm using a jet mill. The softening point of the glass frit obtained above is 560°C. The inorganic binder is uniformly mixed with silver powder, organic binder and additives in a certain proportion, gr...

Embodiment 2

[0021] parts by mass SiO 2 6 copies, B 2 o 3 23 parts, Al 2 o 3 4 copies, Bi 2 o 3 50 copies, P 2 o 5 3 parts, ZnO 5 parts, TiO 2 5 parts, ZrO 2 3 parts and SnO 2 1 part, put into the mixer, mix and disperse for 70 minutes, and let stand for 30 minutes. The pre-mixed lead-free inorganic binder mixture was divided into corundum crucibles, placed in a digital blast drying oven, and dried at 140°C for 185min. The dried lead-free inorganic binder mixture was placed in a muffle furnace and melted at 1000°C for 75 minutes to form a uniform molten glass. Quickly pour the high-temperature molten glass liquid into 30°C deionized water and quench it to obtain block glass. The water-quenched glass block was dried at 120° C., and the lead-free inorganic binder was crushed to 5 μm using a jet mill. The softening point of the glass frit obtained above is 530°C. The inorganic binder is uniformly mixed with silver powder, organic binder and additives in a certain proport...

Embodiment 3

[0023] parts by mass SiO 2 2 copies, B 2 o 3 30 parts, Al 2 o 3 5 copies, Bi 2 o 3 40 copies, P2 o 5 5 parts, ZnO 10 parts, TiO 2 3 parts, ZrO 2 2 parts and SnO 2 3 parts, put into the mixer, mix and disperse for 75 minutes, and let stand for 30 minutes. The premixed lead-free inorganic binder mixture was divided into corundum crucibles, placed in a digital blast drying oven, and dried at 125 °C for 190 min. The dried lead-free inorganic binder mixture was placed in a muffle furnace and melted at 950°C for 75 minutes to form a uniform molten glass. Quickly pour the high-temperature molten glass into deionized water at 25 °C to quench to obtain block glass. The water-quenched glass block was dried at 130 °C, and the lead-free inorganic binder was crushed to 6 μm using a jet mill. The softening point of the glass frit obtained above is 495°C. The inorganic binder is uniformly mixed with silver powder, organic binder and additives in a certain proportion, gro...

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Abstract

The invention discloses a lead-free inorganic adhesive used in silver paste on the back of a crystalline silicon solar cell. The inorganic adhesive is prepared from the raw materials of, by mass: 2-8% of SiO2, 15-30% of B2O3, 1-6% of Al2O3, 30-50% of Bi2O3, 3-5% of P2O5, 5-15% of ZnO, 1-5% of TiO2, 1-3% of ZrO2, and 1-3% of SnO2. The invention also discloses a preparation method of the lead-free inorganic adhesive. The method comprises the steps that: the raw materials for preparing the lead-free inorganic adhesive are added into a mixing machine according to the ratio; the materials are well mixed and the mixture is sub-packaged into corundum crucibles; the corundum crucibles are placed in a drying oven and the mixture is dried for 170-190min under a temperature of 120-140 DEG C; the mixture is placed in a Muffle furnace and is smelted for 60-90min under a temperature of 950-1150 DEG C, such that homogeneous molten glass is obtained; the molten glass is poured into deionized water with a temperature of 15-35 DEG C for water quenching; glass blocks obtained after water quenching are dried under a temperature of 120-140 DEG C; and the lead-free inorganic adhesive is crushed to a size of 5-8mum by using a jet mill. The adhesive provided by the invention does not contain lead and cadmium, and has excellent leveling property and good adhesive property. With the jet mill crushing technology, a glass re-agglomeration phenomenon is avoided, and granularity control is promoted.

Description

technical field [0001] The invention belongs to the technical field of electronic paste, and in particular relates to a lead-free inorganic adhesive for silver paste on the back of a crystalline silicon solar cell and a preparation method thereof. Background technique [0002] Solar cells are the core devices for generating electricity from solar energy, and crystalline silicon solar cells are the mainstream of commercialized solar cells. Crystalline silicon solar cells need to draw current through the front and rear electrodes. The back silver paste is the key material for preparing the back electrodes. It is usually printed on the back of the battery by screen printing technology, and then sintered at high temperature to form a good bond with the silicon substrate. The main components of the back silver paste include silver powder, inorganic binder (also known as glass powder), organic binder and a small amount of additives. Among them, the inorganic binder is mainly prep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/24
Inventor 欧阳洁瑜
Owner GUANGZHOU RUXING TECH DEV
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