Silk-screen printing method of solar cell grid line electrode

Abstract

The invention relates to the technical field of production of solar cells, and in particular, discloses a silk-screen printing method of a solar cell grid line electrode. The method comprises the following steps: a halftone is set with a certain offsets in the gird line direction for two times of silk-screen printing, so that screen knots of screen cloth are staggered from corresponding cells during moving of the screen cloth to prepare the rid line electrode. The method can effectively improve the false printing phenomenon caused by printing of the screen knot parts to improve the printing quality, in particular, is suitable for preparation of a thin grid line, is simple and feasible in operation, and is low in implementation cost.

Description

technical field [0001] The invention relates to the technical field of solar battery sheet production, in particular to the technical field of preparation of solar battery sheet grid wire electrodes. Background technique [0002] At present, the preparation of front grid electrodes of solar cells mainly adopts the method of screen printing. figure 1 . Specifically, the substrate is first fixed on the workbench. When printing, a scraper is used to apply a certain downward pressure on the slurry part on the mesh cloth of the screen plate and move in translation. The slurry is squeezed from the mesh of the graphic part to the substrate by the scraper. Chip. Due to the viscosity of the slurry, the imprint is fixed within a certain range. During the printing process, the scraper is always in line contact with the mesh and the substrate, and the contact line moves with the movement of the scraper. A certain gap allows the mesh cloth to generate a reaction force against the scra...

AI Technical Summary

Problems solved by technology

However, during the printing process, the netting part is prone to printing voids and failure to print, resulting in disconnection of the grid line and affecting the collection of battery current. Now the influence of the netting on printing has become the further narrowing of the grid line in screen printing. a bottleneck

[0005] In order to solve the technical problem of network knot printing, there are mainly two solutions in the existing technology, one is double printing, that is, two printings are used for two printings, and this scheme requires high precision equipment, reaching micron Level, and need to increase equipment, equipment investment and maintenance costs are very high; the second method is to change the screen structure, such as using a steel screen to directly set the required graphics on the steel plate, but because the steel screen is less elastic, so Its service life is short, the cost is high, and it is easy to appear the phenomenon of rough printing on the edge, and the printing quality is not easy to control

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