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Conductive paste for solar battery

A technology for solar cells and conductive paste, applied in the field of solar cells, can solve the problem of high cost of conductive paste, and achieve the effects of improving photoelectric conversion efficiency, reducing the proportion and reducing the cost.

Active Publication Date: 2011-11-09
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the cost of the conductive paste in the prior art is high, and the electrodes made are prone to defects such as trachoma and pinholes, thereby providing a low-cost, non-trachoma-free electrode, Pinhole conductive paste for solar cells

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0026] The preparation of organic vehicles is well known in the art. In the present invention, under the condition of stirring, the synthetic resin and cellulose etc. are sequentially and slowly added to the organic solvent at a constant speed, kept in a water bath at 60-70°C, fully dissolved, and a transparent and uniform organic carrier is obtained.

[0027] The preparation method of the conductive paste of the present invention is well known to those skilled in the art. Put the organic carrier in the stainless steel tank of the high-speed disperser, add glass powder while stirring, and stir well; then add the conductive silver powder to the organic carrier in 2-3 times. Stir well after each addition, and then add the next time; after all the addition, stir well at high speed; finally use The three-roll mill is used for grinding 10-15 times to make the fineness below 15 μm, and then the solar cell conductive paste of the present invention can be obtained.

[0028] Those s...

Embodiment 1

[0032] Conductive silver powder: median particle size is 3.1μm, tap density is 4.3g / cm 2 flake silver powder.

[0033] Glass powder: 65wt% Bi 2 o 3 , 20wt% B 2 o 3 , 8wt% SiO 2 , 6wt% ZnO, 1wt% Al 2 o 3 . Glass powder median particle size D 50 is 3.5 μm.

[0034] Organic vehicle: 10wt% ethyl cellulose, 6wt% epoxy resin, 1wt% cetyl alcohol, 1wt% lecithin, 82wt% organic solvent (butyl carbitol, butyl carbitol acetate, terpineol, Dibutyl phthalate and castor oil are mixed in a weight ratio of 50:20:20:5:5).

[0035] Put 50 parts by weight of the organic carrier in a stainless steel tank of a high-speed disperser, add 1.5 parts by weight of glass powder while stirring, and then stir for 30 minutes at a speed of 500 r / min. Add 48.5 parts by weight (that is, the gamma value is 0.97) of conductive silver powder, add in three times, stir for 60 minutes, and then stir at a high speed of 1500 r / min for 30 minutes. The stirred mixture was Grind 10 times with a special three...

Embodiment 2

[0037] Conductive silver powder: median particle size is 3.1μm, tap density is 4.3g / cm 2 flake silver powder.

[0038] Glass powder: 65wt% Bi 2 o 3 , 20wt% B 2 o 3 , 8wt% SiO 2 , 6wt% ZnO, 1wt% Al 2 o 3 . Glass powder median particle size D 50 is 3.5 μm.

[0039] Organic vehicle: 10wt% ethyl cellulose, 6wt% epoxy resin, 1wt% cetyl alcohol, 1wt% lecithin, 82wt% organic solvent (butyl carbitol, butyl carbitol acetate, terpineol, Dibutyl phthalate and castor oil are mixed in a weight ratio of 50:20:20:5:5).

[0040]Put 48.0 parts by weight of the organic vehicle in a stainless steel tank of a high-speed disperser, add 2.0 parts by weight of glass powder while stirring, and then stir at a speed of 500 r / min for 30 minutes. Add 50.0 parts by weight (that is, γ value of 0.96) of conductive silver powder, add in three times, stir for 60 minutes, and then stir at a high speed of 1500 r / min for 30 minutes. The stirred mixture was Grind 10 times with a special three-roll m...

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Abstract

The invention belongs to the technical field of solar batteries and particularly discloses a conductive paste for a solar battery. The conductive paste comprises an organic carrier and solid powder dispersed in the organic carrier, wherein the solid powder comprises conductive silver powder and glass powder; the conductive silver powder is flaked silver powder; and the conductive silver powder accounts for 92 to 99 weight percent of the solid powder and accounts for 35 to 60 weight percent of the conductive paste. The conductive paste overcomes the prejudice of technicists in the field on lowsilver content and low electric performance, and higher electric performance can be achieved by reducing the silver content in the conductive paste; furthermore, the conductive paste for the solar battery has low silver content and moderate viscosity, and is favorable for screen printing, and attractive in appearance without sand holes, pinholes and the like after being sintered; compared with the common silver paste having higher silver content, the conductive paste has the advantage that the solar battery prepared from the conductive paste has high photoelectric conversion efficiency and the photoelectric conversion efficiency of a monocrystalline silicon piece is more than 17.50 percent.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a conductive paste for solar cells. Background technique [0002] As a kind of green energy, solar cells have attracted more and more attention due to their advantages of inexhaustibility, no pollution, and no limitation of geographical resources. Conductive paste is the main auxiliary material for making silicon-based solar cells. Silicon-based solar cells generally prepare electrodes by printing conductive paste on silicon cell sheets, followed by drying and firing. Conductive paste generally contains conductive metal powder, glass powder and organic vehicle. [0003] The conductive paste used in the back electric field of solar cells is generally conductive silver paste, and the silver powder content in the existing conductive silver paste is basically 70-85%, and some are even higher. The price of silver powder is relatively expensive, which leads to a higher cost of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01B1/22
Inventor 陈东锋谭伟华周勇姜占锋
Owner BYD CO LTD
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