Composite system glass powder for secondary gate electrode silver paste of crystalline silicon solar cell

A solar cell and glass powder technology, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of inability to erode anti-reflection films, etc., to increase the effective contact area and improve Effect of open circuit voltage, good wetting properties

Pending Publication Date: 2022-03-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because there is no sintering adhesion between silver and silicon, the direct contact of silver and silicon creates a Schottky barrier, and silver itself cannot ablate the anti-reflection film

Method used

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  • Composite system glass powder for secondary gate electrode silver paste of crystalline silicon solar cell
  • Composite system glass powder for secondary gate electrode silver paste of crystalline silicon solar cell
  • Composite system glass powder for secondary gate electrode silver paste of crystalline silicon solar cell

Examples

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Effect test

Embodiment 1

[0028] The invention discloses a composite system glass powder for the silver paste of the sub-gate electrode of crystalline silicon solar cells, which is applied to monocrystalline silicon SE-PERC cells.

[0029]First, glass powders of tellurite T1, borate B1 and silicate S1 were prepared respectively, and the specific steps were as follows.

[0030] (1) Batching and mixing: Weigh the raw materials of tellurite T1, borate B1 and silicate S1 according to the oxides and ratios listed in Table 1-3, and then use a mixer to fully mix them for 40 minutes .

[0031] (2) Melting glass: Put the raw materials of tellurite T1, borate B1 and silicate S1 into a corundum crucible and place them in a high-temperature resistance furnace for melting. The melting temperature of tellurite T1 is 950 o C, the time is 30 minutes; the melting temperature of borate B1 is 1050 o C. The time is 40 minutes; the melting temperature of silicate S1 is 1200 o C, the time is 50 minutes.

[0032] (3) Wa...

Embodiment 2

[0052] The invention discloses a composite system glass powder for the silver paste of the sub-gate electrode of crystalline silicon solar cells, which is applied to high square resistance monocrystalline silicon PERC cells.

[0053] First, glass powders of tellurite T2, borate B2 and silicate S2 were prepared respectively, and the specific steps were as follows.

[0054] (1) Batching and mixing: Weigh the raw materials of tellurite T2, borate B2 and silicate S2 according to the oxides and ratios listed in Table 6-8, and then use a mixer to fully mix them for 40 minutes .

[0055] (2) Melting glass: Put the raw materials of tellurite T2, borate B2 and silicate S2 into a corundum crucible and place them in a high-temperature resistance furnace for melting. The melting temperature of tellurite T2 is 900 o C, the time is 30 minutes; the melting temperature of borate B2 is 1000 o C, the time is 40 minutes; the melting temperature of silicate S2 is 1150 o C, the time is 50 minu...

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Abstract

The invention discloses composite system glass powder which is formed by combining tellurite, borate and silicate and is used for silver paste of an auxiliary gate electrode of a crystalline silicon solar cell. In the temperature rising process of sintering of the auxiliary gate electrode silver paste, the tellurite is firstly melted and spread on the silicon surface, so that the sintering reaction between silicon and silver is blocked; then, borate is melted and penetrates through the antireflection layer on the silicon surface in an etching mode, and a silver-silicon conductive contact window is opened; and finally, melting the silicate to inhibit the erosion of the glass melt to the silicon surface and generate a passivation effect. In the cooling process after sintering, silver dissolved by tellurite and brought to the interface is separated out, and a large number of silver colloid particles are formed. Therefore, the composite system glass powder provided by the invention has the effects and characteristics of increasing effective contact of silver and silicon, reducing contact resistance, passivating a silicon surface and the like, and the application performance of the auxiliary gate electrode silver paste can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of inorganic powder functional materials, and in particular relates to a glass powder material, one of the key components of the silver paste of crystalline silicon solar cells. The glass frit of the composite system provided by the invention is used to form ohmic contact with the surface of crystalline silicon solar cells and lead out the photocurrent as the sub-gate silver paste. Background technique [0002] Crystalline silicon solar cell is a widely used new energy device product. Screen printing silver paste metallization is a key process for manufacturing the surface electrodes of crystalline silicon solar cells. It usually uses three types of silver pastes, including the main grid electrode silver paste and the sub-gate electrode silver paste on the front side of the battery, and the back electrode silver paste. (exception, the back of TOPCon battery uses main grid electrode silver paste and sub grid electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00H01B1/16H01B13/00
CPCC03C12/00H01B1/16H01B13/00
Inventor 仝华江梓豪杨云霞孙辛杰袁晓
Owner EAST CHINA UNIV OF SCI & TECH
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