A kind of conductive paste containing core-shell conductive particles and its preparation method

Abstract

The invention relates to electro-conductive paste with core shell conductive particles and a preparation method thereof and belongs to the technical field of electro-conductive paste for solar cells. The electro-conductive paste comprises core shell conductive particles, glass frit, an organic vehicle and an additive. The core shell conductive particles are of a core shell structure, cores of the core shell conductive particles are macromolecule spheres, and shells of the core shell conductive particles are coated type conductive layers. The electro-conductive paste, based on the total amount of the electro-conductive paste as a reference, comprises 33-99wt% of the core shell conductive particles, 0.1-20wt% of glass frit, 0.1-25wt% of the organic vehicle and 0.1-25wt% of the additive. The preparation method includes the steps of preparing macromolecule microspheres, combining the prepared macromolecule microspheres with conductive components to form core shell conductive particles with macromolecule cores and conductive shells, and producing the electro-conductive paste with the prepared core shell conductive particles and other auxiliary components. The electro-conductive paste with core shell conductive particles and the preparation method thereof has the advantages that the electro-conductive paste is applicable to the circuit construction of solar cells and electronic products, the cost of the electro-conductive paste composition can be reduced by 20% -40%, the conductivity is good and the size of the particles is controllable.

Description

technical field [0001] The invention belongs to the technical field of conductive paste for solar cells, and in particular relates to a conductive paste containing core-shell conductive particles, and also relates to 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. The back of the existing solar cell is an n-type region that can be formed on the back of the silicon wafer, so that the n-type silicon can be reversed into p-type silicon. Generally, an aluminum foil that reflects photons and a photon-reflecting aluminum foil are formed by printing conductive paste on the back of the solar cell. The back electric field that collects the back current of the cell. Then print silver conductive paste on the back electric field and the front of the solar cell respectively to form electrode wires,...

AI Technical Summary

Problems solved by technology

But traditional conductive paste has high resistivity between about 20 to 40μΩ / cm, while its conductivity is not high

[0005] Most conductive pastes are made of metal particles supplemented by other additives. Although the conductivity is superior, the cost is high, especially for precious metals such as silver and gold.

In addition, the smaller the metal particles, the better the conductivity, but the preparation of smaller particles of metal particles is difficult