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Leadless front silver paste for crystalline silica solar energy battery

A technology for solar cells and silver paste, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials. Avoid protective effects, increase service life, good conductive contact effect

Active Publication Date: 2013-12-11
乐凯胶片股份有限公司
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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

preparation example Construction

[0026] Preparation of organic vehicle:

[0027] Weigh 1g of ethyl cellulose, 2g of acrylic resin, add 2g of terpineol, 5g of butyl carbitol acetate, and 4g of diethylene glycol butyl ether, mix and heat to 60-90°C, dissolve, and obtain an organic bond agent, spare.

Embodiment 1

[0029]Weigh 5g of ultra-fine lead-free glass powder (softening temperature is 560°C, produced by Kunming Nuoman Electronic Materials Co., Ltd.), 75g of silver powder, 19g of organic carrier, 1g of boron trioxide, mix them evenly, and roll them with a three-roll mill to a fineness of less than 10 microns, adjust the viscosity to 280-400 Pa.s with terpineol to obtain lead-free front silver paste for crystalline silicon solar cells.

Embodiment 2

[0031] Weigh 3g of ultra-fine lead-free glass powder (softening temperature is 600°C, produced by Kunming Nuoman Electronic Materials Co., Ltd.), 75g of silver powder, 20g of organic carrier, 0.3g of phosphorus pentoxide, 1g of tellurium dioxide, mix evenly, and use three rolls The fineness of machine rolling is less than 10 microns, and the viscosity is adjusted to 280-400 Pa.s with terpineol to obtain lead-free front silver paste for crystalline silicon solar cells.

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PUM

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Abstract

The invention discloses a leadless front silver paste for a crystalline silica solar energy battery. The leadless front silver paste comprises silver powder, leadless glass powder, organic carriers, and also an acidic assistant composition, wherein the weight ratio of the leadless glass powder to the acidic assistant agent is 1:0.2 to 1:5. The leadless front silver paste provided by the invention reduces the corrosion to the packaging material EVA glue film of the battery by the alkaline substances in the leadless glass powder, besides, the packaging material EVA glue film is prevented from losing protection effects on the battery, and the service life of the battery is improved.

Description

technical field [0001] The invention relates to a lead-free front silver paste for crystalline silicon 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 assembly can be made, and then form a bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 刘子英苏腾龙任明叔马亚男徐建伟王小记柳青
Owner 乐凯胶片股份有限公司
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