Solar cell front electrode with combination of points and lines and preparation method

Abstract

The invention discloses a solar cell front electrode with combination of points and lines and a preparation method. The front electrode includes point-like silver electrodes printed on a front surface of a P type silicon matrix, metal wires are printed on the metalized point-shaped silver electrodes, and the metal wires are connected with the point-shaped silver electrodes through a transparent conductive adhesive. The preparation method adopts a silk-screen printing technology to print point-shaped silver electrodes on a front surface of a P type silicon matrix which is subjected to texturing, diffusion, post cleaning, film coating, laser film opening and back electrode back field printing process treatment, then a metal wire printing machine is adopted to print metal wire electrodes on surfaces of the silver electrodes after metallization treatment, and the metal wires and the silver electrodes are connected together through a transparent conductive glue. The solar cell font electrode provided by the invention has the advantages that copper electrodes are utilized to replace part of silver electrodes on the front electrode, thereby reducing the silver electrode usage amount of the front electrode of a silicon solar cell, and reducing manufacturing cost of the silicon solar cell; and in addition, the copper electrodes have higher height, thereby improving the aspect ratio of grid lines, and improving efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a point-line combined solar cell front electrode and a preparation method thereof. Background technique [0002] Most of the front electrodes of traditional crystalline silicon solar cells are made by traditional screen printing, and because the paste used is expensive silver paste, the manufacturing cost of solar cells remains high. On the other hand, limited by the accuracy of screen printing, the aspect ratio of screen printed fine grid lines is small, resulting in relatively large front electrode losses, including shading loss, resistance loss, and recombination loss. The second overprinting technology increases the height of fine grid lines, but at the same time increases the cost of silver. Although other methods of making front electrodes can produce relatively thin finger lines, they also greatly increase the complexity of the process, so they are not a low-cost tech...

AI Technical Summary

Problems solved by technology

[0002] Most of the front electrodes of traditional crystalline silicon solar cells are made by traditional screen printing. Because the paste used is expensive silver paste, the manufacturing cost of solar cells remains high.

On the other hand, limited by the accuracy of screen printing, the aspect ratio of screen printed fine grid lines is small, resulting in a relatively large front electrode loss, including shading loss, resistance loss, recombination loss, etc.

The second overprinting technology increases the height of fine grid lines, but at the same time increases the cost of silver

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

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