A kind of conductive paste for front electrode of crystalline silicon solar cell and preparation method thereof

A technology for solar cells and front electrodes, applied in cable/conductor manufacturing, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problem of reducing electrode solderability and solder resistance, poor solderability, silicon Sheet bending deformation and other problems

Inactive Publication Date: 2011-12-14
陈晓东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Most of the glass powders used as inorganic binders contain lead oxide and cadmium oxide, which are serious environmental pollution. For this reason, Chinese invention patents ZL200910304312 and ZL200910218651.7 use lead-free glass powders to replace leaded glass; the glass powders used as inorganic binders are Inorganic oxides have poor conductivity, and the introduction will reduce the conductivity of the front electrode. The Chinese invention patent with application number 200910026144.3 introduces ruthenium into glass powder to improve electrical performance; glass powder and silicon substrate as an inorganic adhesive The expansion coefficients of the silicon substrates differ greatly, which can easily cause the silicon substrate to bend and deform, or even break t

Method used

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  • A kind of conductive paste for front electrode of crystalline silicon solar cell and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 15 grams of ethyl cellulose and 5 grams of phenolic resin to a mixed solution of 10 grams of terpineol, 45 grams of diethylene glycol butyl ether, and 10 grams of tributyl citrate, and heat it at 50 ° C to 80 ° C Disperse and mix evenly to form a clear and transparent organic carrier for later use; take 20 grams of the above organic carrier, add 75 grams of silver powder, 5 grams of silver-gold-germanium alloy powder with a melting point of 450 ° C, and 1 gram of zinc oxide, mix well, and then use three Grinding with a roller grinder for 3 times to make a conductive paste for the front electrode of a crystalline silicon solar cell.

Embodiment 2

[0030] Add 15 grams of ethyl cellulose and 5 grams of phenolic resin to a mixed solution of 10 grams of terpineol, 50 grams of diethylene glycol butyl ether, and 10 grams of tributyl citrate, and heat it at 50°C to 80°C Disperse and mix evenly to form a clear and transparent organic carrier for later use; take 20 grams of the above organic carrier, add 50 grams of silver powder, 25 grams of silver-coated copper powder with a silver weight content of 25%, and 5 grams of silver-gold-germanium alloy with a melting point of 450 ° C Powder, 1 gram of zinc oxide, fully mixed, and then ground with a three-roll mill for 3 times to make a conductive paste for the front electrode of a crystalline silicon solar cell.

Embodiment 3

[0032] Add 20 grams of ethyl cellulose to a mixed solution of 10 grams of terpineol, 55 grams of diethylene glycol butyl ether, and 10 grams of tributyl citrate, and disperse and mix evenly at 50 ° C ~ 80 ° C to form a clear The transparent organic carrier is spare; take 20 grams of the above-mentioned organic carrier, add 75 grams of silver powder, 5 grams of silver-gold-germanium alloy powder with a melting point of 450 ° C, and 1 gram of tin dioxide, mix well, and then use a three-roll mill to grind The conductive paste for the front electrode of the crystalline silicon solar cell was made 3 times.

[0033] The prepared conductive paste for the front electrode of the crystalline silicon solar cell is screen-printed, dried and co-sintered on the crystalline silicon solar cell production line to form a crystalline silicon solar cell, and then the surface state of the crystalline silicon solar cell is observed and the welding Performance, curvature, short circuit current (Isc)...

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Abstract

The invention discloses a conductive paste for a positive electrode of a crystal silicon solar cell and a preparation method of the conductive paste. The paste is prepared by mixing and grinding conductive metal powder, alloy powder which is formed by two or more elements selected from silver, zinc, tin, silicon, copper, magnesium, germanium, gold, beryllium, aluminum, indium, cerium, lanthanum, gallium, bismuth, and nickel, an organic carrier, and one or a mixture of transition metal oxide, lead oxide, stannic oxide, zinc oxide, organic compounds of zinc, and organic compounds of titanium according to a certain weight part. In the conductive paste, glass powder is not used as an inorganic binder, the problems of low electrical properties, low weldability and welding resistance, silicon chip bending and the like caused by adding the glass powder into the conductive paste for the positive electrode of thecrystal silicon solar cell in the prior art are solved, the positive electrode of the crystal silicon solar cell prepared from the paste has firm adhesive force, high ohmic contact, high weldability and high welding resistance, and the solar cell has a high electrical property and low deformability.

Description

technical field [0001] The invention relates to an electronic paste and a preparation method thereof, in particular to a conductive paste for front electrodes of crystalline silicon solar cells and a preparation method thereof. Background technique [0002] Solar energy is an inexhaustible clean energy. With the depletion of non-renewable energy such as coal and oil, the development and utilization of solar energy has become a hot spot. Solar cells are an important means of utilizing solar energy. . Solar cells can be divided into crystalline silicon solar cells, thin-film solar cells, compound semiconductor thin-film solar cells, and photoelectrochemical solar cells, but crystalline silicon solar cells are mainly produced industrially. [0003] As the core component of a crystalline silicon solar cell, the solar cell needs to make two electrodes on the front and the back in order to collect and export the current generated under the light. There are many ways to manufactu...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 陈晓东
Owner 陈晓东
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