Positive electrode printing screen

Abstract

The embodiment of the invention discloses a positive electrode printing screen, which comprises stop membranes and secondary gate line holes formed by adjacent stop membranes; the stop membranes and the secondary gate line holes are cut in the thickness direction of the stop membranes; the cross sections of the formed secondary gate line holes are of inverted trapezoids, wherein each inverted trapezoid is a trapezoid longer in upper bottom side and shorter in lower bottom side. By adopting the positive electrode printing screen provided by the invention, in the printing process, the position pressed by squeegee is sunken, so that the secondary gate line holes in the printing screen are distorted; through controlling the size of the top angle (or bottom angle) of the inverted trapezoids, the widths of the upper and lower openings when the secondary gate line holes are pressed can be almost the same, and finally, the longitudinal section of the formed secondary gate lines is of a rectangular shape; thus, the phenomenon that the printing is poor can be improved; on the other hand, the width of the finally formed secondary gate lines can be reduced, thereby increasing the height width ratio of the finally formed secondary gate lines, and improving the conversion efficiency of a solar battery.

Description

technical field [0001] The invention relates to the technical field of solar cell manufacturing technology, in particular to a positive electrode printing screen. Background technique [0002] At present, the manufacturing process of solar cells has been basically standardized, and the main processes include: cleaning texture, diffusion, PECVD, screen printing and sintering. Among them, the screen printing technology is a traditional process technology, such as making the paste (silver paste, aluminum paste, etc.) pass through the net film with the grid line pattern to form the upper and lower electrodes on the silicon wafer, heating Finally, the organic solvent in the slurry is volatilized to form solar cell electrodes. Screen printing technology is widely used in the production of solar cells because of its low cost and low equipment requirements. [0003] Solar cells need to print the back electrode, the back electric field and the positive electrode, and silver materia...

AI Technical Summary

Problems solved by technology

[0004] However, using the existing positive electrode printing screen is often prone to poor printing, and the conversion efficiency of solar cells is low

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