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Glass powder for PERC cell back silver paste and preparation method thereof

A glass powder and backside technology, applied in the field of conductive paste, can solve the problems of glass transition temperature of glass powder, inability to directly form glass, and high melting point of titanium oxide, so as to improve the photoelectric conversion efficiency and electrode reliability, and improve the battery Fill factor, effect of low softening temperature

Pending Publication Date: 2022-07-15
四川东树新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium oxide is the network intermediate of glass and cannot directly form glass. Usually, adding more than a certain amount of oxidation state in the firing process will destroy the structure of the glass itself, so that the glass powder will be precipitated and phase-separated during the water quenching process. At the same time, the melting point of titanium oxide is very high. Directly adding titanium oxide and other element oxides to fire glass powder is prone to disadvantages such as non-melting or excessive glass transition temperature.

Method used

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  • Glass powder for PERC cell back silver paste and preparation method thereof
  • Glass powder for PERC cell back silver paste and preparation method thereof

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preparation example Construction

[0037] In a specific embodiment, the preparation method of the glass powder for silver paste on the back of the PERC cell includes:

[0038] Add the tetrabutyl titanate-ethanol solution dropwise to the glass powder-acetic acid solution, keep stirring during the dropping process, continue to stir for 30 to 60 minutes after the dropwise addition, separate the solid and liquid, wash and dry to obtain the silver paste on the back of the PERC battery. Glass powder; the mass ratio of the tetrabutyl titanate-ethanol solution:glass powder-acetic acid solution is preferably 100:40-90.

[0039] The glass powder in the glass powder-acetic acid solution is the above-mentioned core Bi 2 O 3 -PbO-SiO 2-CuO-MnO system.

[0040] In a specific embodiment, the tetrabutyl titanate-absolute ethanol solution is a mixture of anhydrous ethanol and tetrabutyl titanate, and the mass ratio of the tetrabutyl titanate: anhydrous ethanol is preferably 5 ~10:100.

[0041] In a specific embodiment, the...

Embodiment 1

[0053] Take D50 as 5 g of 1.3 μm glass powder 1 (the specific components are in the following table), add 100 g of deionized water, use anhydrous acetic acid to adjust the pH value to 4, stir, and record it as suspension A;

[0054] Table 1 Glass powder composition (in parts by mass)

[0055]

[0056] Take 10 g of tetrabutyl titanate, dissolve it in 100 g of absolute ethanol, and record it as solution B;

[0057] 100g of solution B was added to 80g of solution A at a temperature of 20°C-30°C at 1ml / s, stirring was continued during the addition, and the stirring rate was 400r / min. After the addition was completed, stirring was continued for 0.5h. After the reaction was completed, the supernatant was poured, and the lower layer of titanium oxide@glass powder composite powder was removed, washed 4 times with deionized water and absolute ethanol, and dried in a 50°C oven to obtain 5.1g of titanium oxide@glass powder 1, The content of titanium oxide in the titanium oxide@glass ...

Embodiment 2

[0059] Take D50 as 5 g of 1.3 μm glass powder 1 (specific components are shown in Table 1), add 100 g of deionized water, use anhydrous acetic acid to adjust the pH value to 5, stir, and record it as suspension A;

[0060] Take 10 g of tetrabutyl titanate, dissolve it in 100 g of absolute ethanol, and record it as solution B;

[0061] 100g of solution B was added to 80g of solution A at a temperature of 20°C-30°C at 2ml / s. During the addition, stirring was continued at a stirring rate of 400r / min. After the addition was completed, stirring was continued for 0.5h. After the reaction was completed, the supernatant was poured, and the lower layer of titanium oxide@glass powder composite powder was removed, washed 4 times with deionized water and absolute ethanol respectively, and dried in a 50°C oven to obtain 5.18g of titanium oxide@glass powder 2, The content of titanium oxide in titanium oxide@glass frit 2 is specifically about 3.6 wt %.

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Abstract

The invention relates to glass powder for PERC battery back silver paste and a preparation method of the glass powder, and belongs to the technical field of conductive paste. The glass powder for the PERC battery back silver paste is of a core-shell structure, the core is glass powder, and the shell is titanium oxide. The preparation method is simple to operate, easy to implement, non-toxic and low in cost, and the prepared titanium oxide and glass powder composite powder can improve the compactness of an electrode conductive network, reduce the silver-silicon contact resistance and improve the tension of a solar cell and the tension of a drying oven when being used for solar cell conductive paste.

Description

technical field [0001] The invention relates to a glass powder for silver paste on the back of a PERC battery and a preparation method thereof, and belongs to the technical field of conductive paste. Background technique [0002] With the development of social industry, human beings consume more and more energy. Among them, solar energy has the most abundant reserves and is inexhaustible. It is a permanent energy source without pollution and plays a major role in developing an environment-friendly society. Therefore, the utilization of solar energy has also become the focus of research in various countries. In recent years, the power generation efficiency of crystalline silicon solar cells has been improved year by year. Among them, PERC cells have attracted widespread attention in the industry due to their high photoelectric conversion efficiency. [0003] Compared with the conventional crystalline silicon cell, the PERC cell has a layer of AlOx passivation structure on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00
CPCC03C12/00
Inventor 陈浩宇杨红崔隆宇夏粱彭亮李加宁乔梦书张永福
Owner 四川东树新材料有限公司
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