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All-aluminum BSF (back surface field) back electrode slurry and preparation method and application thereof

An all-aluminum back field and back electrode technology, which is applied in the field of solar cells, can solve problems such as unusable, poor sintering, and low tensile force, and achieve the effects of reducing influence, improving electrical conductivity, and increasing tensile force

Active Publication Date: 2019-08-13
SUZHOU ISILVER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the conventional back silver paste is directly printed on the aluminum paste, which will cause low tensile force and falling off due to poor sintering, so it cannot be used

Method used

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  • All-aluminum BSF (back surface field) back electrode slurry and preparation method and application thereof
  • All-aluminum BSF (back surface field) back electrode slurry and preparation method and application thereof
  • All-aluminum BSF (back surface field) back electrode slurry and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A back electrode silver paste for an all-aluminum back field, consisting of the following components (%):

[0047]

[0048] Wherein, the glass powder composition is prepared: the raw materials are mixed (50% of lead oxide, 12% of boron oxide, 3% of silicon oxide, 2% of aluminum oxide, 10% of zinc oxide, 13% of barium oxide, 8% of titanium oxide, 2% of chromium oxide %), followed by melting, quenching, grinding, and water washing processes to obtain a glass powder composition;

[0049] Preparation of organic vehicle: solvent (butyl carbitol acetate 40%, terpineol 35%), cellulose resin (ethyl cellulose 10%), additives (4% Span 85, 3% benzyl alcohol , 8% polyamide wax) mixed to obtain an organic vehicle.

[0050] Mix the above raw materials, stir evenly, transfer to a three-roll machine to grind for 1-3 hours, the fineness is ≤10μm, the viscosity is controlled at 30Pa·S-100Pa·S, and the back electrode silver paste of the all-aluminum back field is obtained.

Embodiment 2

[0052] A back electrode silver paste for an all-aluminum back field, consisting of the following components (%):

[0053]

[0054] Wherein, the glass powder composition and the organic carrier are the same as in Example 1.

[0055] Mix the above raw materials, stir evenly, transfer to a three-roll machine to grind for 1-3 hours, the fineness is ≤10μm, the viscosity is controlled at 30Pa·S-100Pa·S, and the back electrode silver paste of the all-aluminum back field is obtained.

Embodiment 3

[0057] A back electrode silver paste for an all-aluminum back field, consisting of the following components:

[0058]

[0059] Wherein, the glass powder composition and the organic carrier are the same as in Example 1.

[0060] Mix the above raw materials, stir evenly, transfer to a three-roll machine to grind for 1-3 hours, the fineness is ≤10μm, the viscosity is controlled at 30Pa·S-100Pa·S, and the back electrode silver paste of the all-aluminum back field is obtained.

[0061] This embodiment also provides a PERC solar cell, which can be prepared by the following steps:

[0062] PERC solar cell silicon wafers are obtained by texturing, diffusion, back polishing, etching and impurity removal glass, deposition of passivation layer on the back, and deposition of anti-reflection layer on the front;

[0063] On the back light side of the above-mentioned silicon wafer, use screen printing to print non-graphic full back field aluminum paste, print back silver after drying, an...

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Abstract

The invention provides all-aluminum BSF (back surface field) back electrode slurry and a preparation method and application thereof. The raw material of the back electrode slurry comprise 20%-60% of back electrode slurry, 1%-40% of nano metal powder, 0.5%-6% of a glass powder composition, 10%-50% of an organic vehicle, 0.01%-0.1% of a dispersant, and 0%-5% of an additive, wherein the total mass ofthe components of the back electrode paste is 100%, and the average particle size of the silver powder is 0.1-3 microns. The invention also provides the preparation method of the back electrode slurry. The back electrode slurry can be fully sintered in an aluminum slurry layer, and the photoelectric conversion efficiency of a solar cell is improved.

Description

technical field [0001] The invention relates to a conductive paste, in particular to a back electrode paste for an all-aluminum back field, and belongs to the technical field of solar cells. Background technique [0002] For photovoltaic power generation, continuously improving the photoelectric conversion efficiency of solar cells and optimizing production costs have always been the goals pursued by various companies in the industry. At present, PERC cell is a highly efficient and advanced crystalline silicon photovoltaic cell structure. Its mass production average conversion efficiency is currently higher than 21% and is constantly improving. The core step of using PERC technology is to deposit passivation on the back of the cell. film, which is then grooved for backside metal contact. At present, the main method to achieve metal contact on the back is to print a back electrode first, and then print an aluminum paste in other graphic areas as the aluminum back field. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
CPCH01B1/16H01B1/22H01B13/00H01L31/022441Y02E10/50
Inventor 田冉冉周欣山汪山
Owner SUZHOU ISILVER MATERIALS
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