Glass powder for crystalline silicon solar positive silver paste as well as preparation method and application of glass powder

A technology of glass powder and solar energy, applied in semiconductor devices, photovoltaic power generation, electrical components, etc., can solve the problems of impenetrability, high sintering temperature, etc., and achieve the effect of reducing contact potential energy, reducing grid resistance, and improving compactness

Active Publication Date: 2021-05-11
JIANGXI JIAYIN SCI & TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sintering temperature of the glass used in the traditional paste is too high, or it cannot penetrate alumina, so it is necessary to develop a new glass, especially for its low-temperature sintering and better etching performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0072] According to the first embodiment provided by the present invention, a glass frit for crystalline silicon solar energy front silver paste is provided.

[0073] A glass powder for crystalline silicon solar energy front silver paste, the glass powder is composed of the following raw materials:

[0074] TeO 2 5-70 parts by weight, preferably 10-60 parts by weight, more preferably 15-55 parts by weight;

[0075] 3-60 parts by weight of PbO, preferably 5-50 parts by weight, more preferably 10-40 parts by weight;

[0076] Tl 2 o 3 0.3-40 parts by weight, preferably 1-30 parts by weight, more preferably 5-20 parts by weight;

[0077] Bi 2 o 3 1-50 parts by weight, preferably 3-40 parts by weight, more preferably 5-30 parts by weight;

[0078] Li 2 O 0.1-20 parts by weight, preferably 0.3-15 parts by weight, more preferably 0.5-10 parts by weight;

[0079] Na 2 O 0.1-20 parts by weight, preferably 0.3-15 parts by weight, more preferably 0.5-10 parts by weight;

[...

Embodiment 1

[0110] 1. Glass powder formula

[0111] This embodiment provides a front silver paste glass frit for crystalline silicon solar cells, its raw material percentage composition includes: 35% TeO 2 , 25% PbO, 10% Tl 2 o 3 , 13% Bi 2 o 3 , 4% Li 2 O, 1% CaO, 5% SiO 2 , 7% ZnO.

[0112] 2. Preparation of glass powder

[0113] (1) Weigh 60 grams of the above oxide raw materials in parts by mass, grind and mix thoroughly.

[0114] (2) After mixing evenly, put it into a constant temperature dryer at 100°C for 20 minutes.

[0115] (3) Put the dried glass powder raw materials into a crucible, put the crucible into a high-temperature furnace for firing, raise the temperature to 1000° C. and keep it at a constant temperature for 1 hour to obtain a glass melt.

[0116] (4) Put the glass melt into deionized water to quench, take out the glass slag after cooling, put it into a constant temperature drier at 120° C., and dry it.

[0117] (5) Pour the dried glass slag into an agate jar...

Embodiment 2

[0134] 1. Glass powder formula

[0135] This embodiment provides a front silver paste glass frit for crystalline silicon solar cell, its raw material percentage composition includes: 53% TeO2, 11% PbO, 12% Tl2O3, 6% Bi2O3, 4.5% Li2O, 0.5% Cr2O3, 3% SiO2, 2% Al2O3, 8% MgO.

[0136] 2. Preparation of glass powder

[0137] (1) Weigh 60 grams of the above oxide raw materials in parts by mass, grind and mix thoroughly.

[0138] (2) After mixing evenly, put it into a constant temperature dryer at 100°C for 20 minutes.

[0139] (3) Put the dried glass powder raw materials into a crucible, put the crucible into a high-temperature furnace for firing, raise the temperature to 1000° C. and keep it at a constant temperature for 1 hour to obtain a glass melt.

[0140] (4) Put the glass melt into deionized water to quench, take out the glass slag after cooling, put it into a constant temperature drier at 120° C., and dry it.

[0141] (5) Pour the dried glass slag into an agate jar, add ...

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Abstract

The invention discloses glass powder for crystalline silicon solar front silver paste, which comprises the following raw materials: TeO2, PbO, Tl2O3, Bi2O3 and Li2O, selectively comprises one or more of WO3, ZnO, MgO, B2O3, CaO, TiO2, Fe2O3, Al2O3, Ag2O, ZrO2, Na2O, K2O and MoO, and selectively comprises an adhesion additive or a corrosion additive. According to the glass powder for the crystalline silicon solar positive silver paste, Tl2O3 is added, and the Tl2O3 and other raw materials are in a special formula proportion, so that the softening temperature of the glass powder is reduced, the conductivity is increased, and the dielectric loss is relatively small. A passivation layer, including a silicon nitride film and an aluminum oxide film of a PERC crystal silicon wafer, of the crystal silicon wafer can be etched through at a relatively low temperature. The slurry prepared from the glass can be sintered at 720-800 DEG C, and the attenuation problem of a crystalline silicon cell, especially a PERC crystalline silicon cell piece, under high-temperature sintering is reduced to a certain extent, so that the cell efficiency is improved.

Description

technical field [0001] The invention relates to a glass powder and its preparation method and application, in particular to a glass powder for crystalline silicon solar energy front silver paste, its preparation method and application, and belongs to the technical field of solar photovoltaic cells. Background technique [0002] In the whole industry chain of solar cells, the front silver paste is one of the core materials and technologies in the solar cell process. With the advancement of solar cell technology, especially for some advanced high-efficiency new structure cells, such as high-efficiency PERC cells, including ultra-high square resistance PERC cells, PERC-SE cells, double-sided alumina PERC cells, etc. These new structural cells further boost the cell efficiency to 22%. Continuously improved battery manufacturing processes and new designs play an important role. For each new battery technology and new design, the paste must also have corresponding innovations to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00C03C3/072H01L31/0224
CPCC03C12/00C03C3/072H01L31/022425Y02E10/50
Inventor 许亚文卢美军刘白强廖维林
Owner JIANGXI JIAYIN SCI & TECH LTD
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