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Electrode slurry in contact with p+ emitter of N-type solar cell

A solar cell and electrode paste technology, applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve problems such as increased volume resistance, burn-through, and large metal compounding, and achieve a balanced ohm Contact, enhance contact performance, reduce the effect of metal cladding

Active Publication Date: 2021-03-26
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to reduce metal recombination, battery manufacturers currently use low-temperature sintering processes to produce n-PERT batteries and TOPCon batteries. This patent only adds aluminum-silicon alloy powder. During sintering, enough silver-aluminum-silicon contact points cannot be formed, and it is difficult to form ohmic contact with the p+ emitter. A large amount of addition will also cause poor printing when the grid lines are thin (<30 microns)
[0005] The problem of low-temperature sintering can be solved by increasing the corrosiveness of the glass, but it is easy to cause the silver-aluminum contact point to grow too large, burn through the PN junction, and cause the metal composite at the contact position to be too large. How to balance the pair of ohmic contact and metal composite The seesaw is also a big problem

Method used

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  • Electrode slurry in contact with p+ emitter of N-type solar cell
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  • Electrode slurry in contact with p+ emitter of N-type solar cell

Examples

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Embodiment 1

[0034] An embodiment of the electrode slurry in contact with the p+ emitter of an N-type solar cell according to the present invention, the electrode slurry in this embodiment comprises the following components by weight:

[0035] 85 parts of conductive silver powder, 2 parts of aluminum powder, 5 parts of glass powder, 1 part of lanthanum aluminum alloy powder, 8 parts of organic carrier, 1 part of additive;

[0036] The weight ratio of spherical silver powder and nano-silver powder in the conductive silver powder is 4:1; the D50 particle diameter of spherical silver powder is 2 μm, and the D50 particle diameter of nano-silver powder is 100nm;

[0037] The activity of the aluminum powder is 99.0%, and the D50 particle size is 2 μm;

[0038] The formula of described glass powder is as shown in table 1;

[0039] The D50 particle size of the lanthanum aluminum alloy powder is 2 μm, and the mass fraction of aluminum is 99.5%;

[0040] The organic vehicle comprises alcohol ester...

Embodiment 2

[0046] An embodiment of the electrode slurry in contact with the p+ emitter of an N-type solar cell according to the present invention. In the electrode slurry described in this embodiment, except that the D50 particle size of the aluminum powder is 1 μm, all other formulas and preparation methods are the same. Same as Example 1.

Embodiment 3

[0048] An embodiment of the electrode slurry in contact with the p+ emitter of an N-type solar cell according to the present invention. In the electrode slurry described in this embodiment, except that the D50 particle size of the aluminum powder is 3 μm, all other formulas and preparation methods are the same. Same as Example 1.

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Abstract

The invention discloses electrode slurry in contact with a p+ emitter of an N-type solar cell, and relates to the technical field of photovoltaic cells. The electrode slurry comprises the following components in parts by weight: 80-90 parts of conductive silver powder, 0.5-3 part of aluminum powder, 3-8 parts of glass powder, 0.1-2 part of lanthanum-aluminum alloy powder or lanthanum-ytterbium-aluminum alloy powder, 6-10 parts of an organic carrier and 0-2 parts of an auxiliary agent. According to the electrode slurry, an applicant selects the components and the proportion, so that the conversion efficiency can exceed 23.5% after the prepared slurry is applied to the N-type solar cell.

Description

technical field [0001] The invention relates to the technical field of photovoltaic cells, in particular to an electrode paste in contact with a p+ emitter of an N-type solar cell. Background technique [0002] At present, the mainstream solar cell in the photovoltaic market is the p-type PERC (Passivated Emitter and RearCell) cell, that is, the passivated emitter and the back cell. The back surface of the PERC cell is passivated by a dielectric film, and the local metal Contact, greatly reducing the recombination rate of the back surface, while improving the light reflection of the back surface. The PERC battery is a p-type battery, and the front surface is a phosphorus-doped n+ emitter structure, and the conversion efficiency is about 23%. [0003] At present, p-type batteries occupy the absolute share of the crystalline silicon battery market, but with the sharp increase in market demand for high-efficiency batteries and high-power components, n-type batteries have the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01L31/0224
CPCH01B1/16H01B1/22H01L31/022425C03C8/10C03C8/18C03C3/074C03C3/0745
Inventor 黄铭孙倩丁冰冰
Owner GUANGZHOU RUXING TECH DEV
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