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Positive silver paste for crystalline silicon solar cell

A technology for solar cells and silver paste, applied in the field of solar cells, can solve the problems of breaking polymer molecular chains, losing the protective effect of the battery, and reducing the service life of the battery, etc.

Inactive Publication Date: 2017-01-11
JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing front-side silver paste technology, the lead-free glass powder contained contains alkaline oxides. During the sintering process, the corrosion effect of the front-side silver paste on the SiNx:H anti-reflection film is mainly completed by alkaline glass, and the reaction is mainly in the On the surface of the silicon substrate, at the same time, due to the extremely short melting time of the slurry, high viscosity, and poor fluidity, this will cause different distributions of substances in the electrode material
During the reaction process, the glass close to the silicon substrate reacts and is consumed, but there is still a considerable amount of alkaline substances remaining on the surface of the electrode. The residual alkaline substances make the ester bond of the battery packaging material EVA film in a high temperature and humid environment. Breakage, aging, cracking and denaturation of the polymer molecular chain will eventually lead to the delamination of the packaging material EVA film, which will lose the protection of the battery and reduce the service life of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The front silver paste provided by the invention is used for making front silver electrodes of crystalline silicon solar cells, and the front silver paste is prepared from silver powder, lead-free glass powder, organic vehicle and additive composition. The lead-free glass powder liquefies during rapid sintering, and plays a bonding role between the silver powder and the silicon substrate, and at the same time plays the role of penetrating the anti-reflection film, so that a good ohmic contact is formed between the silver powder and the silicon substrate. The lead-free glass powder used in the present invention is well known to those skilled in the art. It can be purchased directly from the market or prepared by methods well known to those skilled in the art. Its softening temperature is 350°C-600°C. Because when the softening temperature is lower than 350°C, the glass film layer between the front silver electrode and the silicon substrate may be too thick due to the exce...

Embodiment 1

[0018] Weigh 5g of ultra-fine lead-free glass powder with a softening temperature of 560°C, 75g of silver powder, 19g of organic carrier, and 1g of boron trioxide. ~400Pa.s to obtain lead-free front silver paste for crystalline silicon solar cells.

Embodiment 2

[0020] Weigh 3g of ultra-fine lead-free glass powder with a softening temperature of 600°C, 75g of silver powder, 20g of organic carrier, 0.3g of phosphorus pentoxide, 1g of tellurium dioxide, mix evenly, and roll with a three-roll mill to a fineness of less than 10 microns. Oleyl alcohol is used to adjust the viscosity to 280-400 Pa.s to obtain lead-free front-silver paste for crystalline silicon solar cells.

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Abstract

The invention relates to positive silver paste for a crystalline silicon solar cell. The positive silver paste for the crystalline silicon solar cell comprises silver powder, lead-free glass powder and an organic carrier, wherein the lead-free positive silver paste also comprises an additive composition; and the weight ratio of the lead-free glass powder to the additive is 1 to 0.1-5. By adoption of the positive silver paste for the crystalline silicon solar cell, corrosion of an alkali material in the lead-free glass powder to a packaging material EVA adhesive film of the cell is lowered; a protection effect failure to the cell caused by delamination of the packaging material EVA adhesive film is avoided; and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to a front silver paste for a crystalline silicon solar cell, belonging to the technical field of solar cells. Background technique [0002] Solar energy is a kind of green energy. People pay more and more attention to it because of its advantages of non-pollution, inexhaustibility, and not limited by geographical resources, so solar cells emerge as the times require. A crystalline silicon solar cell is a device that can respond to light energy and convert light energy into electrical energy. It can convert light energy into electrical energy by using the photovoltaic effect. When sunlight hits the battery board, a certain potential difference is generated on the surface of the two poles of the battery, and an external circuit is connected to generate current. Several batteries are connected in series or in parallel, and then sealed and protected by the packaging material EVA film (ethylene vinyl acetate copolymer), the battery a...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01L31/0224H01L31/18
CPCY02P70/50
Inventor 郭宏彬
Owner JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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