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Lead-free glass powder for silicon-based solar cell back silver paste and preparation method thereof

A lead-free glass powder and solar cell technology, applied in the field of lead-free glass powder preparation, can solve problems such as environmental pollution, and achieve the effects of wide sintering process window, low equipment requirements, and high adhesion

Active Publication Date: 2017-07-04
浙江晶科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since lead is a heavy metal element harmful to the human body and has certain pollution to the environment, it is necessary to develop high-performance lead-free glass powder for back silver paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] The preparation method of the lead-free glass powder for the silver paste on the back of the silicon-based solar cell comprises the following steps in sequence:

[0029] 1) Weigh raw materials according to the following components and weight percentages, Bi 2 o 3 81%, H 3 BO 3 7%, ZnO 1%, SiO 2 5%, Al 2 o 3 4%, Cu 2 O 2%, the above-mentioned raw materials used are analytically pure;

[0030] 2) Pass the above raw materials through a 300-mesh sieve and mix them evenly;

[0031] 3) Put the uniformly mixed glass powder raw materials into the corundum crucible and keep it warm at 1000°C for 60 minutes;

[0032] 4) The molten high-temperature glass liquid is quenched into glass slag in deionized water;

[0033] 5) The glass powder slag after water quenching is preliminarily crushed by a double-roll mill, and crushed to a coarse powder of 30 μm;

[0034] 6) Put the coarse powder into the polyurethane ball mill tank, choose zirconia balls with three diameters of Φ...

Embodiment example 2

[0038] The preparation method of the lead-free glass powder for the silver paste on the back of the silicon-based solar cell comprises the following steps in sequence:

[0039] 1) Weigh raw materials according to the following components and weight percentages, Bi 2 o 3 82%, H 3 BO 3 8%, ZnO 2%, SiO 2 2%, Al 2 o 3 3%, Cu 2 O 3%;

[0040] 2) Pass the above raw materials (analytical pure) through a 300 mesh sieve and mix them evenly;

[0041] 3) Put the uniformly mixed glass powder raw materials into a corundum crucible and keep it warm at 1050°C for 30 minutes;

[0042]4) The molten high-temperature glass liquid is quenched into smaller glass slag in deionized water;

[0043] 5) The glass powder slag after water quenching is preliminarily crushed by a double-roll mill, and crushed to a coarse powder of 80 μm;

[0044] 6) Put the coarse powder into the polyurethane ball mill tank, choose Φ6-Φ12 zirconia balls as the grinding balls, where Φ6:Φ10:Φ12=7:2:1 (mass ratio...

Embodiment example 3

[0048] The preparation method of the lead-free glass powder for the silver paste on the back of the silicon-based solar cell comprises the following steps in sequence:

[0049] 1) Weigh raw materials according to the following components and weight percentages, Bi 2 o 3 84%, H 3 BO 3 7%, ZnO 2%, SiO 2 2%, Al 2 o 3 2%, Cu 2 O 3%;

[0050] 2) Pass the above raw materials (analytical pure) through a 300 mesh sieve and mix them evenly;

[0051] 3) Put the uniformly mixed glass powder raw materials into the corundum crucible, and keep it warm at 1000-1050°C for 30-60min;

[0052] 4) The molten high-temperature glass liquid is quenched into smaller glass slag in deionized water;

[0053] 5) The glass powder slag after water quenching is preliminarily crushed by a double-roll mill, and crushed to a coarse powder of 30-80um;

[0054] 6) Put the coarse powder into the polyurethane ball mill tank, choose Φ6-Φ12 zirconia balls as the grinding balls, where Φ6:Φ10:Φ12=7:2:1 (m...

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Abstract

The invention discloses lead-free glass powder for back silver paste of a silicon-based solar battery and a preparation method of the lead-free glass powder. The lead-free glass powder comprises the following raw materials by weight percent: 80-90% of Bi2O3, 5-15% of H3BO3, 1-5% of ZnO, 1-5% of SiO2, 1-5% of Al2O3 and 2-6% of Cu2O. The preparation method of the lead-free glass powder comprises the following steps: sieving and uniformly mixing the raw materials, and then, performing heat preservation in a muffle furnace with the temperature of 1000-1050 DEG C for 30-60 min until the raw materials are completely liquified, so as to obtain liquid glass; sequentially pouring the liquid glass into deionized water to be subjected to water quenching, and performing preliminary smashing, ball-milling and drying by adopting a double-roller machine, so as to obtain the back silver lead-free glass powder with the particle size of 0.8-2.0 [mu]m and the glass transition point Tg of 380-420 DEG C. The lead-free glass powder provided by the invention can well promote the metalization process of silver powder during the high temperature phase, and improves the weldability of a back silver film layer and the adhesive force of the back silver film layer and a silicon base material.

Description

technical field [0001] The invention belongs to the technical field of preparation of lead-free glass powder, and in particular relates to a lead-free glass powder for silver paste on the back of silicon-based solar cells and a preparation method thereof. Background technique [0002] Crystalline silicon solar cells are semiconductor cells that convert solar energy into electrical energy. With the extreme consumption of fossil (oil, coal, natural gas, etc.) energy and the increasingly serious greenhouse effect, human demand for new clean energy has become increasingly more and more urgent. In the future development, solar energy will be one of the effective ways to provide clean energy. As solar cells are increasingly used in many occasions, their market demand is also showing an increasing trend. [0003] There are three main types of electrodes needed for solar cells, one is the front silver paste; the other is the back aluminum paste; the third is the back silver paste....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C12/00
Inventor 陈小龙杨磊陈烈刘洁
Owner 浙江晶科新材料有限公司
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