Regulating method for grid line offset of solar cell and application thereof

Abstract

The invention discloses a regulating method for grid line offset of a solar cell. The regulating method comprises the following steps: adopting a screen printing plate for printing grid lines onto silicon slices; separately measuring a distance x between adjacent laser slots and a distance y1 between centers of adjacent grid lines as well as a distance y2 between end points of adjacent grid lines;calculating first offset spacing sigma 1 and second offset spacing sigma 2 between the laser slots and the grid lines; judging according to an offset spacing condition, and regulating a screen printing plate PT value and / or tension value. Correspondingly, the invention further discloses application of the regulating method for the grid line offset of the solar cell to a solar cell production process. The regulating method disclosed by the invention can obviously reduce or eliminate offset of electrode grid lines and laser slots, and improves collecting ability, on charge carriers, of the electrode grid lines while meeting cell appearance requirements.

Description

technical field [0001] The invention relates to the field of solar cell electrode printing, in particular to a method for adjusting solar cell grid offset and its application. Background technique [0002] Screen printing is a commonly used solar cell printing technology at present. Its basic operation process is: place the silicon wafer with laser grooves on the workbench, pour the slurry on the screen above the workbench, and then use a scraper to place it on the workbench. Apply a certain pressure on the screen, and at the same time move the scraper from one end of the screen to the other, the slurry can be squeezed from the mesh of the graphic part onto the silicon wafer, thereby completing the screen printing. In the current printing process, the printing effect is mostly adjusted through parameters such as printing pressure, printing pitch, printing speed, and printing height. [0003] On the other hand, with the development of solar cell technology, laser heavy dopin...

AI Technical Summary

Problems solved by technology

The existing screen printing process, when printing laser grooves, often has a large offset, which not only cannot meet the requirements for the appearance of the cell, but also easily causes carrier collection difficulties and carrier transport losses

[0004] In the prior art, this problem is often solved by widening the width of the laser grooves. For example, the width of the existing laser grooves is mostly 120-300 μm to reserve a larger printing space, but this will reduce the number of electrode grid lines and reduce the current carrying capacity. The amount of sub-collection is small, which reduces the efficiency of the cell; at the same time, it also increases the risk of cracks in the silicon wafer

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