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

Abstract

The invention discloses a conductive paste for the back electrode of a crystalline silicon solar cell and a preparation method thereof. The paste is prepared by mixing and grinding conductive metal powder, a metal adhesive, an organic carrier, and a functional additive in a certain weight ratio. to make. The present invention uses no glass powder as the inorganic binder, which overcomes the poor electrical performance, poor solderability and solderability, and poor solderability and solder resistance of the conductive paste used for the back electrode of silicon solar cells in the prior art due to the addition of glass powder. The back electrode of the crystalline silicon solar cell prepared with this slurry has firm adhesion, good ohmic contact, good solderability and solder resistance, and the solar cell has superior electrical performance and small deformation.

Description

technical field [0001] The invention relates to a silicon solar cell paste and a preparation method thereof, in particular to a conductive paste for silicon solar cell back electrodes 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 silicon solar cells, thin-film solar cells, compound semiconductor thin-film solar cells, and photoelectrochemical solar cells according to different materials and processes, but silicon solar cells are mainly produced industrially. [0003] As the core component of a 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 manufac...

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Problems solved by technology

[0008] Most of the glass powders used as adhesives contain lead oxide and cadmium oxide, which are serious environmental pollution. For this reason, the patent application number 200910094798.X 201010294275.2 uses lead-free glass powders instead of leaded glass; the glass powders used as adhesives are inorganic Oxide, poor conductivity, will reduce the conductivity of the back electrode after introduction. The patent application number 200910026144.3 introduces ruthenium into the glass powder to improve the electrical performance; the expansion coefficient of the glass powder used as the adhesive is different from that of the silicon substrate. Larger, it is easy to bend and deform the silicon substrate, or even break the silicon substrate. Chinese invention patent ZL200910094945.3 introduces silicon alloy powder while retaining the glass powder to reduce bending deformation; the glass powder used as the adhesive is inorganic oxidation The solderability and solder resistance are poor, and the solderability and solder resistance of the electrode are reduced after the introduction

[0009] Although there are various disadvantages of glass powder in the conductive paste for the front electrode of crystalline silicon solar cells, glass powder as an inorganic adhesive is still an indispensable component of the conductive paste for the back electrode of silicon solar cells in the prior art

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