Screen printing plate used for crystal silicon solar cell step-by-step printing technology

Abstract

The invention relates to a screen printing plate used for a crystal silicon solar cell step-by-step printing technology. The screen printing plate comprises a main grid screen printing plate body andan auxiliary grid screen printing plate body; a main grid line is arranged on the main grid screen printing plate body in a corresponding mode, and an auxiliary grid line is arranged on the auxiliarygrid screen printing plate body in a corresponding mode; and the width of the auxiliary grid line on the auxiliary grid screen printing plate body is gradually widened at a certain distance L away from the edge of the corresponding position of the main grid line on the main grid screen printing plate body and reaches the maximum at position where the auxiliary grid line and the main grid line areoverlapped. According to the screen printing plate used for the crystal silicon solar cell step-by-step printing technology, the problem of grid breaking of the main grid position corresponding to theauxiliary grid screen printing plate body in the solar cell step-by-step printing process, and the collecting efficiency of the current is improved accordingly.

Description

technical field [0001] The invention relates to the field of production and manufacture of crystalline silicon solar cells, and specifically discloses a screen plate for a step-by-step printing process of crystalline silicon solar cells. Background technique [0002] With the continuous maturity and progress of crystalline silicon solar cell technology, cost has gradually become the first issue to be considered in cell process optimization and new technology development; currently, the main grid and auxiliary grid are separated and designed between two screens by using a step-by-step printing process Above all, the manufacturing cost is greatly reduced by using different silver pastes for the main grid and the auxiliary grid and reducing the unit consumption of silver paste. The existing step-by-step printing screen design is simply to split the main grid and the sub-grid into two screens, without considering the impact of the main grid pattern on the battery sheet on the su...

AI Technical Summary

Problems solved by technology

When the auxiliary grid lines are printed on the silicon wafer again, due to the existence of this height difference, the screen plate is deformed due to extrusion at the edge of the main grid lines, resulting in the deformation of the printed auxiliary grid lines, and the height and width are reduced. In severe cases The thin grid is disconnected at the place where it overlaps with the main grid line, thus affecting the collection of current by the auxiliary grid line (such as Figure 4 As shown, the circle is a broken grid)

When there are many broken grids, the photoelectric conversion efficiency of the battery sheet is reduced, resulting in loss

Even undisconnected auxiliary grid lines have reliability risks during the long-term use of components

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