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Conductive paste and preparation method thereof

A technology of conductive paste and glass frit, which is applied in the field of solar cells, can solve the problems of lower photoelectric conversion efficiency, lower bonding force of silicon-aluminum layer, and bending of conductive paste, and achieve high photoelectric conversion efficiency, good adhesion, and bending degree small effect

Active Publication Date: 2010-12-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conductive paste is generally placed on the stainless steel mesh belt for sintering, but the conductive paste currently used has bending phenomenon after sintering, and there will be marks of the mesh belt
Imprints are not only unsightly, but also likely to cause a decrease in the bonding force of the silicon-aluminum layer in the imprinted part, resulting in a decrease in photoelectric conversion efficiency

Method used

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  • Conductive paste and preparation method thereof

Examples

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preparation example Construction

[0031] A kind of preparation method of above-mentioned conductive paste, it comprises:

[0032] (1) adding the organic binder into the organic solvent, heating and dissolving to obtain an organic carrier solution;

[0033] (2) Add glass powder selectively to the organic carrier solution under stirring, and then add aluminum powder; grind to make the fineness less than 20 μm.

[0034] Preferably, it is prepared as follows:

[0035] (1) get terpineol with mass ratio: dibutyl phthalate (DBP): butyl carbitol acetate=75: 15: 10 mix uniformly, make organic solvent; Dissolve in the above mixed solvent, fully dissolve at 50-80°C and stir evenly to obtain a transparent and uniform organic carrier solution.

[0036] (2) Put the organic carrier solution in the stainless steel tank of the high-speed disperser, while stirring, selectively add glass powder, and stir well; add aluminum powder in multiple times, stir well each time, and then add the next time; all After adding, stir at hig...

Embodiment 1

[0040] (1) Take terpineol according to the mass ratio: dibutyl phthalate (DBP): butyl carbitol acetate = 75: 15: 10 and mix evenly to make an organic solvent. Dissolve 2 parts by weight of organic binder C5 petroleum resin in 15 parts by weight of the above-mentioned organic solvent, heat to 60° C. to fully dissolve, and stir evenly to obtain a uniform and clear organic carrier solution.

[0041] (2) Place the above-mentioned organic carrier solution in the stainless steel tank of the high-speed disperser, while stirring, add 1 weight part of glass powder (the composition is 60wt% BaO, 25wt% B 2 o 3 , 3.5wt% CaO, 5.0wt% SiO 2 , 2.5 wt% Al 2 o 3 , 2.0wt% ZnO, 1.0wt% MgO, 1.0wt% ZrO 2 ; Median particle size D 50 1.5 μm), stir evenly. Add 82 parts by weight of aluminum powder (spherical aluminum powder, D 50 4.5μm, the surface is covered with 3nm aluminum nitride), stir well before adding each time; after adding all, stir well at high speed; finally use Grinding with a s...

Embodiment 2

[0043] The difference from Example 1 is: the aluminum powder is 80 parts by weight, the glass powder is 3 parts by weight, and the rest are the same as in Example 1. The conductive paste is designated as A2.

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Abstract

The invention relates to the technical field of solar cell and discloses a conductive paste. The conductive paste comprises aluminum powder, organic binder, organic solvent and glass powder, wherein the glass powder is selectively contained, the organic binder is C5 petroleum resin, and the glass powder is BaO-B2O3 system glass powder. The invention also discloses a preparation method of the conductive paste. The conductive paste provided by the invention can generate no rust steel mesh belt imprint after being sintered, an aluminum film is smooth and is vesicant-free, the adhesion of a sialic layer is favorable, the bending degree of a silicon wafer is small and the photo-electricity conversion efficiency is high.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a conductive paste for silicon solar cells and a preparation method thereof. Background technique [0002] As a kind of green energy, solar energy has attracted more and more attention because of its many advantages such as inexhaustible, non-pollution, and not limited by geographical resources. [0003] Conductive paste is the main auxiliary material for making silicon-based solar cells. Silicon-based solar cells generally prepare electrodes by printing a conductive paste on a silicon substrate, followed by drying and firing. [0004] The conductive paste is generally silver paste and aluminum paste. Its main components are Ag / Al powder, glass powder and organic solvent. The conductive paste is generally placed on a stainless steel mesh belt for sintering, but the currently used conductive paste has a bending phenomenon after sintering, and there will be marks of the mesh...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18
CPCY02P70/50
Inventor 谭伟华刘珍周勇姜占锋
Owner BYD CO LTD
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