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

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...

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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 the silicon substrate. The Chinese invention patent ZL200910094945.3 introduces silicon alloy powder while retaining the glass powder to reduce the bending deformation; as an inorganic adhesive Glass powder is an inorganic oxide, which has poor welding performance, and the introduction reduces the weldability and solderability of the electrode

[0009] Although there are various disadvantages of glass powder in the conductive paste for the front electrode of crystalline silicon solar cells, as an inorganic adhesive and as a material for melting and penetrating silicon nitride anti-reflection film during co-sintering, glass powder is still the most important material in the prior art. Indispensable ingredient of conductive paste for front electrode of crystalline silicon solar cell

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