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Silver-aluminum paste for P + surface of high-sheet-resistance TOPcon battery and preparation method of silver-aluminum paste

A high square resistance, silver-aluminum paste technology, applied in the direction of cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of metal compound becoming smaller, contact failure, battery opening voltage gain, etc. problems, to achieve the effect of increasing sintering density, improving heat and activity, and improving electrical conductivity

Pending Publication Date: 2022-07-29
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The front side of the current TOPcon battery is affected by the paste used, and the doping concentration is ≥10 19 , the square resistance is 80-120Ω; ordinary silver-aluminum paste cannot achieve good contact on the P+ surface of the TOPcon battery with a square resistance of more than 120Ω, and the contact resistivity is generally > 5mΩ.cm 2 , so that the series resistance Rs of the battery is relatively high; the lower the doping concentration of the front contact of the TOPcon battery, the larger the square resistance, and the more difficult the contact is; Opening voltage has gain, so TOPcon battery with high square resistance and low doping will become the mainstream structure of TOPcon battery in the future

Method used

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  • Silver-aluminum paste for P + surface of high-sheet-resistance TOPcon battery and preparation method of silver-aluminum paste
  • Silver-aluminum paste for P + surface of high-sheet-resistance TOPcon battery and preparation method of silver-aluminum paste
  • Silver-aluminum paste for P + surface of high-sheet-resistance TOPcon battery and preparation method of silver-aluminum paste

Examples

Experimental program
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Effect test

Embodiment 1

[0023] An embodiment of the silver-aluminum paste used for the P+ side of the high square resistance TOPcon battery according to the present invention, the formula of the glass powder in this embodiment is shown in Table 1, and the silver-aluminum paste used for the P+ side of the high square resistance TOPcon battery is shown in Table 1. The formula of the pulp is shown in Table 2.

[0024] In Example 1, the preparation method of the glass powder is as follows: according to the glass powder formula (weight percentage) in Table 1, batching is performed, (1) after the various components are fully mixed, the mixed materials are put into a crucible and placed in a crucible. Smelting in a high-temperature muffle furnace, the melting temperature is 1000 °C, and the holding time is 30 minutes; (2) Pour the heat-retained molten material into deionized water for quenching, and ball-mill and dry the water-quenched glass slag. That is to get glass powder.

[0025] The preparation metho...

Embodiment 2

[0029] The formula of the glass powder described in this example is shown in Table 1, and the formula of the silver-aluminum paste used for the P+ side of the high square resistance TOPcon battery is shown in Table 2.

[0030] The preparation method of the glass powder is the same as that of Example 1, and the preparation method of the silver-aluminum paste for the P+ side of the high square resistance TOPcon battery is the same as that of Example 1.

[0031] In this embodiment, the median diameter D of the silver powder 50 is 1.5um, and the bulk density is 3.4g / m 3 , the tap density is 5.54g / m 3 , the specific surface area is 1.0m 2 / g, the particle size of the nano-silver wire is 25nm, the length is 10-20μm, the median diameter of the aluminum powder is D 50 is 5um, and the bulk density is 0.52g / m 3 , the tap density is 0.86g / m 3 , the median diameter D of the aluminum-zinc alloy 50 is 3um, and the bulk density is 0.38g / m 3 , the tap density is 0.2g / m 3 .

Embodiment 3

[0033] The formulation of the glass powder described in this example is shown in Table 1, and the formulation of the silver-aluminum paste used for the P+ side of the high square resistance TOPcon battery is shown in Table 2.

[0034] The preparation method of the glass powder is the same as that of Example 1, and the preparation method of the silver-aluminum paste for the P+ side of the high square resistance TOPcon battery is the same as that of Example 1.

[0035] In this embodiment, the median diameter D of the silver powder 50 is 1.5um, and the bulk density is 3.4g / m 3 , the tap density is 5.54g / m 3 , the specific surface area is 1.0m 2 / g, the particle size of the nano-silver wire is 20nm, the length is 10-50μm, the median diameter of the aluminum powder is D 50 is 3.0um, and the bulk density is 0.48g / m 3 , the tap density is 0.75g / m 3 , the median diameter D of the aluminum-zinc alloy 50 is 3um, and the bulk density is 0.38g / m 3 , the tap density is 0.2g / m 3 . ...

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Abstract

The invention discloses silver-aluminum paste for a P + surface of a high-sheet-resistance TOPcon battery and a preparation method of the silver-aluminum paste, and belongs to the field of battery electrode paste. The silver-aluminum paste comprises the following components in percentage by weight: 70-89% of silver powder, 1-5% of silver nanowires, 1-10% of aluminum powder, 0.5-1% of aluminum alloy, 1-8% of glass powder and 1-10% of an organic carrier. The glass powder contains silver oxide, and the aluminum alloy is at least one of an aluminum-zinc alloy and an aluminum-boron alloy; the silver nanowire and the aluminum alloy are added into the silver-aluminum paste, and meanwhile, the silver oxide is added into the glass powder, so that good contact can be formed on the p + surface of 150 omega sheet resistance under the conditions that the sintering temperature of the TOPcon battery is not changed and the metal composition of the battery is not increased, and the electrical performance of the TOPcon battery is improved to a great extent.

Description

technical field [0001] The invention relates to the field of battery electrode paste, in particular to a silver-aluminum paste for the P+ surface of a high square resistance TOPcon battery and a preparation method thereof. Background technique [0002] A tunnel oxide passivation contact solar cell (TOPcon) is a cell that uses an ultra-thin oxide layer as a passivation layer structure. The TOPcon battery is mainly based on N-type silicon substrate, and a passivation structure is formed on the back of the battery silicon substrate through an ultra-thin oxide layer and a thin layer of doped silicon; the mechanism of the front passivation contact of the TOPcon battery is: During the sintering process, the glass body in the slurry is first softened and corrodes the silicon nitride and aluminum oxide deposited on the outermost layer on the front of the battery. The lower the softening point of the glass body, the greater the activity, and the less corrosive to silicon nitride and ...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
CPCH01B1/16H01B1/22H01B13/00H01L31/022425
Inventor 孙倩黄铭刘银花万俊亮丁冰冰
Owner GUANGZHOU RUXING TECH DEV
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