Lead-free glass powder for solar batteries and pure silver paste

A technology of lead-free glass powder and solar cells, which is applied to conductive materials dispersed in non-conductive inorganic materials, circuits, photovoltaic power generation, etc. It can solve the problems of lowering the melting temperature of glass, failure to achieve good bonding, and low surface activity. , to achieve the effect of reducing thermal expansion coefficient, promoting stability and good dispersion

Inactive Publication Date: 2017-08-11
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the glass powder in the domestic and foreign electrode silver paste uses lead dioxide as the main raw material. Although the lead dioxide component can effectively react with silicon to convert into simple lead, because lead oxide can reduce the melting temperature, Improve the wetting of the silicon base, so that the paste has better adhesion after sintering, but the toxicity of lead-containing glass has gradually been replaced by lead-free glass powder
The lead-free glass in the Chinese Patent Publication No. CN 102126829 A application literature can slightly reduce the melting temperature of the glass, but its surface activity is low, and it cannot achieve the effect of good combination with the silicon layer when the silver paste is sintered

Method used

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Examples

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preparation example Construction

[0031] According to the present invention, the preparation method of lead-free glass powder for solar cell of the present invention comprises the following steps:

[0032] (1) Ball mill all the raw materials and pass through a 200-mesh sieve to fully mix the raw materials evenly and reduce the particle size of the raw materials;

[0033] (2) Melt the ground raw materials at 800°C-1200°C for 60-90 minutes, and then keep them warm for 20-30 minutes at a temperature of 950°C-1200°C to obtain a uniform and clear glass melt;

[0034] (3) Quenching the molten glass in deionized water, and obtaining glass particles after cooling;

[0035] (4) Coarsely grind the glass particles by wet method: add deionized water into the ball mill and use zirconium balls with a diameter of 10-25mm for ball milling, the ball milling time is 2-5h, and then use zirconium balls with a diameter of 2-3mm Ball milling, the ball milling time is 2-4h, to obtain glass powder;

[0036] (5) Put the glass powder...

Embodiment 1

[0045] A lead-free glass powder for solar cells, the softening temperature of the lead-free glass powder is 430 ° C, the average particle size is 0.7 μm, the lead-free glass powder includes 52 parts of bismuth oxide, 2 parts of antimony oxide, 3 parts of zinc oxide 1 part, 4 parts of boric acid, 5 parts of silicon oxide, 1 part of rhenium oxide, 0.5 part of strontium oxide;

[0046] The lead-free glass powder also contains barium oxide with a content of 0.6% of the total weight of the glass powder;

[0047] The preparation method of described lead-free glass powder comprises the following steps:

[0048] (1) Ball mill all the raw materials and pass through a 200-mesh sieve to fully mix the raw materials evenly and reduce the particle size of the raw materials;

[0049] (2) Melt the ground raw material at 900°C for 60 minutes, and then keep it at 1000°C for 30 minutes to obtain a uniform and clear glass melt;

[0050] (3) Quenching the molten glass in deionized water, and obt...

Embodiment 2

[0056] A lead-free glass powder for solar cells, the softening temperature of the lead-free glass powder is 450 ° C, the average particle size is 0.9 μm, the lead-free glass powder includes 59 parts of bismuth oxide, 4 parts of antimony oxide, 5 parts of zinc oxide 4 parts of boric acid, 6 parts of silicon oxide, 2 parts of rhenium oxide, 1 part of strontium oxide;

[0057] The lead-free glass powder also contains barium oxide with a content of 0.8% of the total weight of the glass powder, and a lanthanide metal oxide with a content of 0.3% of the total weight of the glass powder;

[0058] The preparation method of described lead-free glass powder comprises the following steps:

[0059] (1) Ball mill all the raw materials and pass through a 200-mesh sieve to fully mix the raw materials evenly and reduce the particle size of the raw materials;

[0060] (2) Melt the ground raw material at 900°C for 70 minutes, and then keep it at 980°C for 20 minutes to obtain a uniform and cle...

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Abstract

The invention discloses lead-free glass powder for solar batteries. The lead-free glass powder is prepared from bismuth oxide, antimony oxide, zinc oxide, boracic acid, silicon oxide, rhenium oxide and strontium oxide. The invention further discloses pure silver paste containing the lead-free glass powder. Products of the lead-free glass powder are uniform in granule and good in dispersity, and the softening point is between 420 DEG C and 480 DEG C; components of zinc oxide, silicon oxide and boron oxide can improve the chemical stability and heat stability of glass, and the boron oxide component can further reduce the thermal expansion coefficient of the glass powder; bismuth oxide serves as a redox active additive, the stability of the antimony oxide component in the glass powder preparation is promoted, and the precipitation of metal bismuth is avoided; besides, the preparation method of the glass powder is simple in process, glass prepared from the glass powder is small in granule size and uniform in performance, better sintering of conductive silver powder can be further promoted, so that an electrode is more compact, the good ohmic contact is formed, the series resistance is reduced, and therefore the efficiency of battery pieces is improved, and the service life of the battery pieces is prolonged.

Description

technical field [0001] The invention belongs to the technical field of solar cell silver paste, and in particular relates to a lead-free glass powder and front silver paste for solar cells. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electricity. The aluminum back electric field is an important component of the solar cell, which can reduce the contact resistance and improve the photoelectric 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 bonds 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 improve the ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00C03C3/064H01B1/22H01L31/0224
CPCC03C3/064C03C12/00H01B1/22H01L31/022425Y02E10/50
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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