Method for manufacturing positive electrode of solar cell in printing manner

Abstract

The invention discloses a method for preparing an electrode, in particular to a method for manufacturing a positive electrode of a solar cell in a printing manner. The method comprises the following steps of: locating an solar cell sheet on a printing platform to be fixed; moving the solar cell sheet to be under a printing head; applying a pressure onto an electrode slurry in the printing head so that the electrode slurry flows out of a nozzle of the printing head and is in contact with the upper surface of the solar cell sheet; printing a discontinuous high-aspect-ratio electrode grid line with a shape consistent with a shape of the nozzle of the printing head on the solar cell sheet after the printing platform and the printing head do motions in opposite directions; and subsequently, repeating the steps above after the printing plate and the printing head do relative motions to a proper position so as to print a continuous high-aspect-ratio electrode grid line on the solar cell sheet. The method for manufacturing the positive electrode of the solar cell in the printing manner, disclosed by the invention, has the advantages of breaking through the limitation of a traditional screen printing manner, being capable of manufacturing a positive grid line with the width of 20-80 microns, and having important industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of an electrode, in particular to a printing method for preparing a front electrode of a solar battery. technical background [0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. Its working principle is: when sunlight shines on the surface of a solar cell, new hole-electron pairs will be formed on the p-n junction of the solar cell semiconductor device. Under the action of the junction electric field, holes flow from the n-region to the p-region, electrons flow from the p-region to the n-region, and a current is formed after the circuit is turned on. In order to extract the photo-generated current generated by the solar cell, positive and negative electrodes must be made on the surface of the solar cell, and the electrode that determines the photoelectric conversion efficiency of the solar cell is the front electrode that extracts electrons. [0003] At present...

AI Technical Summary

Problems solved by technology

The latest screen printing process uses a screen design that increases the number of grid lines to print electrodes to reduce series resistance, but after increasing the number of grid lines, the width of the grid lines needs to be reduced accordingly so as not to produce larger electrodes The shading area; however, to further reduce the width of the grid line and ensure the height of the grid electrode, it is difficult to achieve by the traditional screen printing process; this is mainly due to the nature of the screen printing process, the currently used screen The wire diameter of the screen is generally around 25 μm. If you want to continue to reduce the width of the screen printing, you must reduce the wire diameter of the screen, and the reduction of the wire diameter of the screen will affect the strength and tension of the screen.

[0005] On the basis of the traditional screen printing sintering process, some researchers have disclosed Chinese patent CN 101447531 A (disclosure date 20090603) and Chinese patent CN 101807627 A (disclosure date 20100818), by introducing electroplating and sputtering into the screen printing process process, which can produce thinner grid lines with a larger aspect ratio, but due to the introduction of electroplating and sputtering processes, its production cost is also greatly increased

Some researchers also disclosed the Chinese patent CN 201868440 U (publication date 20110615), which reduces the shading area and reduces the series resistance by setting a gradient structure of fine grid lines with a width of 40-90 μm, thereby improving the photoelectricity of solar cells. Conversion efficiency, but its role is limited due to the fact that the gate preparation method has not been changed