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A kind of permeable back field aluminum paste for solar cells and its preparation method and application

A technology of solar cells and back-field aluminum paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of increased series resistance, high cost, and reduced photoelectric conversion efficiency of cells and other problems, to achieve the effect of good ohmic contact and convenient operation

Active Publication Date: 2018-01-26
EGING PHOTOVOLTAIC TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After a passivation layer is formed on the back surface of the battery, it is also necessary to prepare the aluminum paste into strip-shaped local contacts and back point contacts on the passivation film by screen printing, because of the existence of the passivation film. Under normal sintering state, it is difficult for the aluminum paste to penetrate the passivation film and form a good ohmic contact, which leads to an increase in the series resistance and reduces the photoelectric conversion efficiency of the cell.
[0004] In order to make the printed back field aluminum paste and the substrate of the solar cell have good ohmic contact and collect current, the passivation film is often treated as follows: a number of through holes are formed on the passivation film by laser opening method , so that the aluminum paste coated on the surface of the passivation film can be in contact with the substrate of the solar cell through the hole, but this technology needs to rely on a whole set of equipment, the process is complicated, and the cost is high; or it can be chemically etched The method uses silicon paste to screen-print a silicon paste layer with a point contact pattern on the composite passivation film, and then uses a chemical etching solution to etch away the area of ​​the composite passivation film that is not covered by the silicon paste layer, and then applies aluminum paste, but Chemical corrosion will inevitably produce pollution

Method used

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  • A kind of permeable back field aluminum paste for solar cells and its preparation method and application
  • A kind of permeable back field aluminum paste for solar cells and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Prepare organic carrier,

[0020] Heat 25 parts by weight of terpineol to 70° C. under stirring, add 2.5 parts by weight of ethyl cellulose therein and continue to stir until the ethyl cellulose is completely dissolved, and cool naturally to normal temperature;

[0021] (2) 72 parts by weight of aluminum powder and 3 parts by weight of ammonium fluorosilicate are mixed and ground evenly to obtain pretreated aluminum powder;

[0022] (3) Add 1.2 parts by weight of coupling agent TMC-101 to the organic vehicle obtained in step (1) and fully disperse it, then add the pretreated aluminum powder obtained in step (2) and stir fully, and finally add 4 The electronic paste in parts by weight is uniformly stirred with an epoxy resin type binder to obtain aluminum paste.

[0023] After forming a passivation layer on the back surface of a 125mm×125mm single crystal silicon wafer, the aluminum paste prepared in this embodiment is directly printed on the passivation surface wit...

Embodiment 2

[0028] (1) Prepare organic carrier,

[0029] Heat 28 parts by weight of terpineol to 75°C under stirring, add 2.8 parts by weight of ethyl cellulose therein and continue to stir until the ethyl cellulose is completely dissolved, then cool naturally to normal temperature;

[0030] (2) Mix and grind 75 parts by weight of aluminum powder and 3.5 parts by weight of ammonium fluorosilicate evenly to obtain pretreated aluminum powder;

[0031] (3) To the organic vehicle obtained in step (1), first add 1.4 parts by weight of coupling agent TMC-101 and fully disperse, then add the pretreated aluminum powder obtained in step (2) and fully stir, and finally add 4 The electronic paste in parts by weight is stirred evenly with a silicone resin type binder to obtain aluminum paste.

[0032] Directly use the aluminum paste prepared in this comparative example to form an aluminum electrode film on the passivation surface by screen printing, and the specific operation is the same as that in ...

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Abstract

The present invention belongs to the field of aluminum pastes for the back surface field of a solar cell, and particularly relates to an aluminum paste with permeability for the back surface field of a solar cell, and a preparation method therefor and the use thereof. The aluminum paste comprises an aluminum powder, an auxiliary permeation agent, a coupling agent, a binder and an organic carrier. A passivation layer is formed on the back surface of the cell, the aluminum paste is directly subjected to screen printing to form an electrode membrane on the passivation surface and is dried, and the aluminum paste is thus allowed to permeate into the substrate surface of the solar cell, thereby forming a good ohmic contact.

Description

technical field [0001] The invention belongs to the field of back-field aluminum paste for solar cells, in particular to a permeable back-field aluminum paste for solar cells and its preparation method and application. Background technique [0002] Passivation film is an important part of crystalline silicon solar cells, which can reduce carrier recombination and improve conversion efficiency; it can also improve contact, reduce contact resistance, and increase parallel resistance; at the same time, it also has an anti-reflection effect. [0003] After a passivation layer is formed on the back surface of the battery, it is also necessary to prepare the aluminum paste into strip-shaped local contacts and back point contacts on the passivation film by screen printing, because of the existence of the passivation film. Under normal sintering state, it is difficult for the aluminum paste to penetrate the passivation film and form a good ohmic contact, which leads to an increase i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01B13/00H01L31/022441Y02E10/50
Inventor 孙铁囤姚伟忠汤平
Owner EGING PHOTOVOLTAIC TECHNOLOGY CO LTD