Solar battery coating equipment and coating method

Abstract

The invention provides solar battery coating equipment and a coating method. A direct-current power supply and / or a constant-brightness light source is adopted to irradiate electroplating in the prior art, a hole is easily formed in an electroplating grid, and the silicon contact surface is small, so that easy stripping from silicon is caused, and the resistance is higher. The solar battery coating equipment comprises a coating groove for accommodating electroplating solution, a plating solar battery transmission module for horizontally transmitting a plating solar battery with a downward light receiving surface, and a pulse excitation source for inputting pulse electroplating electric energy to the plating solar battery or synchronously inputting and exciting the pulse electroplating electric energy to the plating solar battery; and a plating area of the plating solar battery is coated through the pulse electroplating electric energy. The solar battery coating equipment can use the pulse electroplating electric energy to improve the coating quality so as to improve the adhesion strength of the plated grid and reduce the series resistance, and correspondingly improves the efficiency and quality of the solar battery.

Description

technical field [0001] The invention relates to the field of solar cell manufacturing, in particular to a solar cell coating device and a coating method. Background technique [0002] In the field of silicon solar cell manufacturing, the metallization process is a very important key process, which directly forms the electrodes that extract the electric energy generated by the silicon solar cell and has a greater impact on the efficiency of the silicon solar cell. In the current large-scale silicon solar cell manufacturing, screen printing is usually used to print silver paste on the front side of silicon solar cells to form grids, but the price of silver is relatively high, which becomes a bottleneck for further reducing the cost of solar cells; The silver grid formed by screen printing has a low aspect ratio, which results in a larger area of ​​the light-receiving surface of the silicon solar cell being shielded by the grid, and in addition, a larger series resistance of th...

AI Technical Summary

Problems solved by technology

[0005] An important reason why the electroplating grid is easy to peel off at the nickel-silicon interface is that a DC power supply is used for electroplating during electroplating. Since the cations continue to obtain electrons in the area to be plated and form on the area to be plated, the electroplating cations near the area to be plated cannot be separated. to replenish in time, resulting in low nucleation density of the coated metal film and easy to form on the gate E such as Figure 1a and 1b The void H shown in the figure, in addition to causing the plated gate to be easily peeled off, the void H will also cause its resistance to be large

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