Method for manufacturing solar cell positive electrode grid line

Abstract

The invention discloses a method for manufacturing a solar cell positive electrode grid line. Through the wool manufacturing, diffusion, edge insulation, PSG removing and reflecting film plating and reducing technology, a positive electrode grid line graph is printed on a silicon wafer in a silk-screen mode, the silicon wafer is printed with a back electrode and a back electric field, rapid sintering is performed to form ohmic contact, a sintered cell piece is placed in a light induction plating tank, the cell piece is taken as a positive electrode, a silver stick is taken as a negative electrode, part of the grid line is dissolute to be manufactured into a seed layer, light induction plating is adopted, silver plating and thickening are performed on the seed layer, the silk-screen printing technology and rapid sintering technology are adopted on a solar positive electrode to form the good ohmic contact, on the basis of the grid line graph with the qualified tensile force, plating dissolving is performed on the deckle edge area of the grid line, the width of the grid line cannot be increased due to the deckle edge, afterwards, silver is electroplated on the grid line, and the cross section of the manufactured grid line is quasi-semi-circular. The line width is small, the depth-width ratio is large, the seed layer form is ideal, the grid line structure is compact, the series resistance is low, and the conversion efficiency of a cell piece can be effectively improved.

Description

technical field [0001] The invention relates to the field of solar cell manufacturing technology, in particular to a method for preparing positive electrode grid lines. Background technique [0002] With the increasing tension of global energy sources, solar cells have unique advantages such as no pollution, no mechanical rotating parts, easy maintenance, unattended, short construction period, random scale, easy combination with buildings, and large market space. The advantages have been widely valued by countries all over the world, and many large companies in the world have invested in the research and development and production of solar cells. Currently, the challenge in manufacturing silicon solar cells is to improve the efficiency of solar cells to increase the power generation per unit area, and to further reduce the manufacturing cost so that it can be widely used. In crystalline silicon solar cells, the preparation of the positive electrode grid on the silicon wafer...

AI Technical Summary

Problems solved by technology

If silver plating is performed directly on the printed and sintered grid lines, there will be a situation where silver is also plated on the burr area, resulting in a significant increase in the width of the grid lines, which is not conducive to the improvement of cell efficiency.

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