Main grid electrode structure of solar cell and preparation method thereof

Abstract

The invention belongs to the technical field of a solar cell, and particularly relates to a main grid electrode structure of a solar cell and a preparation method thereof. A positive electrode comprises a thin grid silver electrode; metal wires are printed on the metallized thin grid silver electrode; and the metal wires are connected with the silver electrode by adhering points. The preparation method comprises the steps of: by adopting a silk-screen printing process, printing the thin grid silver electrode on the positive surface of a P-type silicon matrix processed by processes of texturing, diffusion, post washing, coating and printing of a back field of a back electrode; and then printing a metal wire main grid electrode on the surface of the metallized silver electrode, wherein the metal wires are connected with the silver electrode together by the adhering points. The main grid electrode structure for the solar cell and the preparation method thereof, which are disclosed by the invention, have the advantages that a copper electrode replaces a positive main grid silver electrode so as to reduce the use quantity of the silver electrode of the positive electrode of the silicon solar cell, thereby reducing production cost of the silicon solar cell; and additionally, the copper electrode is used for replacing burn-through silver paste so as to reduce breakage and replacement of a passive film, improve surface passivation efficiency and improve cell efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a main grid electrode structure of a solar cell and a preparation method thereof. Background technique [0002] At present, the main component of the electrode material of solar cells (mainly refers to sub-grid and main grid) is silver, and the cost of silver accounts for 15% of current solar cells, which consumes a lot of energy and is expensive. To reduce the manufacturing cost of solar cells, it is crucial to reduce the consumption of Ag without negatively affecting the electrical performance. [0003] like image 3 As shown, the front electrode of the solar cell in the prior art is usually designed by a continuous main grid 3 perpendicular to the auxiliary grid 2 . The current generated in the battery flows from the inside of the battery to the surface of the battery, then passes through the top doped layer laterally, and finally the contact on the top surfac...

AI Technical Summary

Problems solved by technology

The cost of silver electrodes accounts for 15% of the manufacturing cost of the entire silicon solar cell and is expensive, which makes the cost of silicon solar cells relatively high, resulting in the inability to promote silicon solar cells

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