Device and method for preparing gate electrodes of solar cell

Abstract

The invention provides a device and method for preparing gate electrodes of a solar cell. The device comprises a silver paste supplying device, a nozzle height adjusting module, a nozzle, a programmable-control high-voltage generator, an adsorption platform, a motion platform and a control unit. The method comprises the steps of placing a solar substrate on the adsorption platform, and preparing the first gate electrode and the second gate electrode, wherein the width of the second gate electrode is larger than that of the first gate electrode. The electric spinning direct writing process is utilized for printing the solar electrodes, an electric field is utilized for pulling silver paste in the nozzle to lines with the diameters smaller than the diameter of the nozzle, and the widths and the heights of the printed grid lines can be controlled by controlling the different voltages, the height of the nozzle and the feed speed of a substrate. The voltages affect the stability of a Taylor cone at a certain height, the height affects the heights of the printed grid lines mainly by affecting the degree of cure of the grid lines in the air, the larger the height is, the higher the printed grid lines become, the feed speed of the substrate mainly affects the widths of the printed grid lines, and the higher the speed is, the thinner the grid lines become.

Description

technical field

[0001] The invention belongs to the field of solar cells, and more specifically relates to a device and method for preparing solar cell grid electrodes. Background technique

[0002] A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. With the continuous progress of the photovoltaic industry, the market has put forward higher requirements for photovoltaic products. High efficiency and low cost have become important goals for the development of solar cells. One of the key steps in the production of solar cells is to fabricate very fine circuits on the front and back sides of the silicon wafers to direct the photo-generated electrons out of the cell. At the same time, in order to obtain a high-efficiency solar cell, the shading area of ​​the grid line must be reduced, and at the same time, it must have an efficient charge collection capability, so the preparation of the ...

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