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Conductive paste and preparation method thereof

A technology of conductive paste and silver powder, applied in the field of solar cells, can solve the problems of high contact resistance and low photoelectric conversion efficiency of cells

Inactive Publication Date: 2012-05-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the prior art when ultra-fine silver powder is used to achieve low-temperature rapid sintering: the contact resistance between the electrode and the silicon substrate is large, and the photoelectric conversion efficiency of the battery is low

Method used

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  • Conductive paste and preparation method thereof
  • Conductive paste and preparation method thereof

Examples

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preparation example Construction

[0023] The preparation method of the conductive paste of the present invention mainly includes: adding glass powder and silver powder to the organic carrier, heating and stirring; mixing and grinding afterward; wherein, the average particle diameter of the silver powder is 0.05-0.8 μm; the compound containing Ag in the glass powder .

[0024] The preparation method of the conductive paste of the present invention can be as follows: adding glass powder and ultrafine silver powder to the organic carrier in sequence, heating and stirring to make the paste substantially uniform and smooth in appearance; then mixing and grinding with a three-roll mill.

[0025] Generally, glass powder, silver powder, and organic vehicle can be prepared by various techniques known to those skilled in the art. For example, silver powder can be directly purchased commercially; glass powder can be obtained by dispersing, drying, melting and cooling each component compound in proportion; the organic veh...

Embodiment 1

[0039] Concretely contained component and corresponding content in the present embodiment slurry are as follows (based on the gross mass 100% of slurry):

[0040] Silver powder: 75%, average particle size 0.1μm

[0041] Glass powder: PbO 2.4%, SiO 2 0.8%, ZnO 0.35%, B 2 o 3 0.1%, Ag 2 O 0.25%, Na 2 O 0.11%

[0042] Organic carrier: organic solvent: terpineol 13%

[0043] Resin binder: ethyl cellulose 1.6%, EPDM rubber 3.6%

[0044] Organic Additives: Dibutyl Phthalate 2.79%

[0045] According to this component ratio, the slurry is prepared according to the following steps:

[0046] a. After weighing each component in the glass powder according to the mass ratio on a balance with an accuracy of 0.01g, add a certain amount of water and dispersant, and mix in a dispersing mixer for 0.5h;

[0047] b. Dry the dispersed and mixed glass paste at 150°C, and heat it in a muffle furnace at 1300°C for 0.5h;

[0048] c. Pour the molten and clarified glass into deionized water ...

Embodiment 2

[0055] Concretely contained component and corresponding content in the present embodiment slurry are as follows (based on the gross mass 100% of slurry):

[0056] Ultrafine silver powder: 80%, average particle size 0.3μm

[0057] Glass powder: PbO 1.95%, SiO 2 0.65%, ZnO 0.3%, B 2 o 3 0.08%, Ag 2 O 0.15%, Na 2 O 0.15%

[0058] Organic vehicle: organic solvent: DBE 10.8%

[0059] Resin binder: ethyl cellulose 3.5%

[0060] Organic Additives: Dibutyl Phthalate 2.42%

[0061] According to this composition ratio and the same preparation method as in Example 1, the prepared conductive paste is denoted as S2.

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Abstract

The invention provides a conductive paste. The conductive paste contains silver powder, glass powder and an organic carrier, wherein the average particle size of the silver powder is 0.05-0.8mu m, and the glass powder contains a compound of Ag. According to the invention, the super-fine silver powder is used as the main component of the conductive paste provided by the invention, thereby greatly reducing sintering temperature and shortening sintering time; and simultaneously, addition of the compound of Ag in the glass powder is in favor of evenly and rapidly forming a Ag-Si intermetallic compound and reducing a contact resistance between an electrode and a solar substrate. Through using the conductive paste provided by the invention, the energy consumption generated by a solar battery can be effectively reduced, production efficiency is improved, and simultaneously the solar battery plate is ensured to have good photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the field of solar cells, in particular to a conductive paste and a preparation method thereof. Background technique [0002] At present, solar energy, as a clean energy, has been developing rapidly, and solar cells are the main components of photovoltaic power generation. The electrodes of a solar cell include a front electrode and a back electrode. The front and back electrodes are generally printed with front and back conductive pastes on the front and back of the solar cell, and then sintered to form the front electrode, back electric field and back electrode. The front conductive paste is generally silver paste, mainly including silver powder, glass powder and organic vehicle. In the preparation process of solar cells, the anti-reflection film on the surface of n-type silicon can be dissolved by molten glass powder to realize the contact between the slurry and the silicon wafer; at the same time, the silver powder in the ...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 郭冉谭伟华周勇
Owner BYD CO LTD
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