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Conductive paste for solar cell and preparation method thereof

A technology for solar cells and conductive pastes, applied in circuits, electrical components, photovoltaic power generation, etc., can solve the problems of small bending degree, rare materials for conductive pastes, complicated processes, etc., and achieves low cost, is conducive to mass production, Simple preparation process

Active Publication Date: 2010-09-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the prior art that the raw materials of conductive paste for preparing cells with small curvature and high photoelectric conversion efficiency are rare, the process is complicated, and it is not conducive to mass production, and to provide a cell with a small degree of curvature, Conductive paste with high photoelectric conversion efficiency, easy-to-obtain raw materials, simple preparation and easy process, and preparation method thereof

Method used

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Examples

Experimental program
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preparation example Construction

[0018] The invention also provides a preparation method for the above-mentioned conductive paste, which includes mixing metal powder, glass powder and an organic vehicle. In the present invention, it is preferred to first mix tungsten, molybdenum, gold powder and glass powder, and ball mill to obtain metal-glass mixed powder, which is then mixed with other powders and organic carriers. Specific can be

[0019] (1) Dissolve the ethyl cellulose and amino polyamide resin in a mixed solvent composed of terpineol or other above-mentioned organic solvents, fully dissolve the ethyl cellulose at 20-60°C and stir evenly to obtain Transparent organic carrier.

[0020] (2) Mix the prepared glass oxide powder evenly, put it into a porcelain crucible, put it into a silicon carbide rod furnace, heat it up to 500-600°C and keep it for 0.5h, then raise it to 1100-1250°C, and melt for 3 hours , quenched in water, dried until the water content is less than 8%, put it into a smelting furnace a...

Embodiment 1

[0026] (1) Configuration of organic carrier

[0027] Get the terpineol of 36wt%, the dibutyl phthalate (DBP) of 34wt%, the butyl carbitol acetate of 20wt% mix homogeneously, the ethyl cellulose of 5wt% and the polyamide resin of 5wt% are dissolved in In the above mixed solvent, heat to 45°C to fully dissolve it, and stir evenly to obtain a uniform and clear solution.

[0028] (2) Preparation of glass powder

[0029] Get 55wt% lead oxide (PbO), 10wt% boron trioxide (B 2 o 3 ), 15wt% silicon dioxide (SiO 2 ), 13.5wt% zinc oxide, 3.5wt% alumina, 1wt% magnesium oxide (MgO), 2wt% zirconia (ZrO 2 ) mixed evenly, put it into a porcelain crucible, put it into a silicon carbide rod furnace, heat it up to 5500°C and keep it for 0.5 hours, then raise it to 1200°C, melt it for 3 hours, quench it in water, dry it until the water content is less than 8%, and then put it in Put into the smelting furnace of 1200 ℃, smelt again for 3 hours, quench in water, crush to 120 microns, put into ...

Embodiment 2

[0035] Adopt the same method as Example 1 to prepare aluminum conductive paste, the difference is that gold powder is contained in the metal powder, and the prepared metal gold-glass mixed powder with a median particle diameter of 1.0 microns, the amount of gold powder is the total metal-glass mixed powder 40wt% of the amount.

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Abstract

The invention provides conductive paste for a solar cell, comprising metal powder, glass powder and an organic carrier, wherein, the metal powder comprises aluminum powder and one ore more of tungsten powder, molybdenum powder and gold powder. The conductive paste solves the problem that the solar cell is easily warped after sintering; the solar cell finally prepared from the conductive paste of the invention has higher photoelectric conversion efficiency; and the conductive paste has easily obtained raw material sources and less element pollution, thus lowering the cost to some extent. The invention further provides a preparation method of the paste. In the method, the tungsten powder, the molybdenum powder and the gold powder are simply added to the conductive paste or uniformly mixed with the glass powder after simple ball-milling and then added to the conductive paste to obtain the finished product through simple process without smelting and large-sized equipment. The invention has simple preparation process and low cost, thus being beneficial to mass production.

Description

technical field [0001] The invention relates to a conductive paste and a preparation method thereof, more specifically, the present invention relates to a conductive paste for a solar cell and a preparation method thereof. Background technique [0002] As a kind of green energy, solar energy has attracted more and more attention due to its advantages of inexhaustibility, no pollution, and no limitation of geographical resources. Existing silicon-based solar cells generally prepare electrodes by printing a conductive paste containing conductive metal powder, glass powder and an organic vehicle on a silicon substrate, drying and firing. The front electrode of the silicon substrate of a solar cell is generally a negative electrode, and the coated conductive paste is usually a conductive silver paste; the back electrode is generally a positive electrode, and the coated conductive paste is usually a conductive aluminum paste. [0003] Conductive aluminum paste belongs to one of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/0216H01L31/18H01L31/042
CPCY02E10/50Y02P70/50
Inventor 谭伟华刘珍周勇姜占锋
Owner BYD CO LTD
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