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Solar cell silver-backed slurry with wide sintering process window

A technology for solar cells and back silver paste, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, and can solve the problem that the characteristics of the wide sintering process window cannot be reflected, the sintering process window is narrowed, and the thermal expansion problems such as low coefficient, to avoid self-agglomeration, low crystallinity and high conductivity

Active Publication Date: 2015-05-20
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the glass powders used in this type of front-side silver paste are silicon-containing glass powders. This type of silicon-containing glass powder has a low thermal expansion coefficient but a high degree of crystallization
This crystallization phenomenon will narrow the sintering process window of the silver paste, that is, the parameter change of the sintering process will easily lead to the reduction of the dissolution of the silver powder in the glass phase, which will lead to the generation of lump silver, making the silver paste containing silver powder with different sintering activity The characteristics of its wide sintering process window cannot be reflected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A solar cell back silver paste with a wide sintering process window, its components and weight percentages are: 55% silver powder, 7% lead-free silicon-free glass powder, 10% acrylic resin, 20% terpineol, 5% Silver oxide, 3% is BYK-110. Among them, the silver powder is composed of 80% spherical silver powder and 20% flake silver powder by weight percentage, and the tap density of the spherical silver powder is> 5g / cm 3 , The average particle size is 0.2-1.5μm, the tap density of flake silver powder>4.5g / cm 3 , with an average thickness of 0.1-0.2 μm and an average lateral dimension of 0.5-3 μm; the composition and weight percentage of lead-free and silicon-free glass powder are: 85% bismuth oxide, 3% boron oxide, 1% zinc oxide, 1% aluminum oxide, 3 % barium oxide, 5% calcium oxide, 0.5% vanadium oxide and 1.5% zirconium dioxide.

Embodiment 2

[0016] A solar cell back silver paste with a wide sintering process window, its components and weight percentages are: 45% silver powder, 3% lead-free silicon-free glass powder, 11% ethyl cellulose, 40% solvent, 0.1% Silver carbonate, 0.9% BYK-110, wherein the silver powder is composed of 50% spherical silver powder and 50% flake silver powder by weight, and the tap density of the spherical silver powder is >5g / cm 3 , The average particle size is 0.2-1.5μm, the tap density of flake silver powder>4.5g / cm 3 , the average thickness is 0.1-0.2μm, and the average lateral dimension is 0.5-3μm; the composition and weight percentage of lead-free and silicon-free glass powder are: 65% bismuth oxide, 15% boron oxide, 4.9% zinc oxide, 2% aluminum oxide, 5 % barium oxide, 0.1% calcium oxide, 5% vanadium oxide and 3% phosphorus pentoxide.

Embodiment 3

[0018] A solar cell back silver paste with a wide sintering process window, its components and their weight percentages are: 50% silver powder, 5% lead-free silicon-free glass powder, 10% methacrylic resin, 30% butyl carb Alcohol acetate, 3% silver oxide, 2% BYK-110; Among them, the silver powder is composed of 70% spherical silver powder and 30% flake silver powder, and the tap density of the spherical silver powder is > 5g / cm 3 , The average particle size is 0.2-1.5μm, the tap density of flake silver powder>4.5g / cm 3 , the average thickness is 0.1-0.2μm, and the average lateral dimension is 0.5-3μm; the composition and weight percentage of lead-free and silicon-free glass powder are: 67% bismuth oxide, 5% boron oxide, 10% zinc oxide, 10% aluminum oxide, 4 % Barium Oxide, 0.5% Calcium Oxide, 1.5% Vanadium Oxide and 2% Titanium Dioxide.

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Abstract

The invention relates to solar cell silver-backed slurry with a wide sintering process window. The slurry is composed of, by weight, 45-55% of silver powder, 3-7% of lead-free silicon-free glass powder, 10-15% of organic binder, 20-40% of solvent, 0.1-5% of sintering promoter and balance of auxiliaries, wherein, the sliver powder is composed of, by weight, 50-80% of spherical silver powder and 20-50% of schistose silver powder. The silver-backed slurry adopts the silver powder with different sintering activities to be used with the lead-free silicon-free glass powder, and small amount of the sintering promoter is added, so that the silver powder of different sintering activities can realize forming of a compact silver-film structure within a wider sintering temperature range; the lead-free silicon-free glass powder is low in crystallization degree, so that dissolving, of the sliver powder, in a glass phase, within the wide sintering temperature range is promoted; and adding of certain amount of the sintering promoter can effectively avoid the sliver powder from self-coagulation to form silver bar, so that the silver-backed slurry has the wide sintering process window.

Description

technical field [0001] The invention relates to a conductive paste, in particular to a solar battery back silver paste with a wide sintering process window. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electricity. The solar cell back silver paste is the main component of the solar cell electronic paste. It is mainly used to make the back busbar in the production of solar cells, and plays the role of converging and exporting the current collected by the aluminum back field. The silver paste on the back of the solar cell is mainly composed of silver powder, organic binder, inorganic binder, solvent and additives. In addition to the cost, conductivity and other performance indicators of the back silver paste, the width of the sintering process window is also a key indicator for examining the back silver paste, because it affects the process quality of cell production and the yield of the final finished solar cell . The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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