Silk screen plate capable of reducing gate breaking under electroluminescence imaging and manufacturing method of silk screen plate

Abstract

The invention discloses a manufacturing method of a silk screen plate capable of reducing gate breaking under electroluminescence imaging. The mesh of the silk screen plate is 290. The silk diameter of the screen cloth on the silk screen plate is 20 micrometers. The membrane thickness of the silk screen plate is 15 micrometers. The tension of the silk screen plate is 26N. The total thickness of the silk screen plate is 45 micrometers. Terpineol is added to the silver paste of the printing silk screen plate, the volume mass ratio of the terpineol is 0.5%, the distance between the screen plate and a printing tabletop is 800-1000 micrometers, and the printing speed is 180-200mm/s. The specification of original silk screen plates is changed, the mesh, silk diameter and membrane thickness of the silk screen plate are lowered, the screen quantity of paste is increased, gate breaking during printing is reduced, the paste is thinned by adding the terpineol into the silver paste, the silver paste can be evenly sprayed by the silk screen plate distance and the printing speed, battery gate breaking quantity is reduced, and battery piece production yield is increased. The silk screen plate is simple in structure, convenient to operation and refined in process, battery piece production efficiency is increased, and gate breaking is reduced.

Description

technical field [0001] The invention belongs to the technical field of production methods of solar cells, and in particular relates to a method for reducing broken grids under electroluminescence imaging. Background technique [0002] A solar cell is a device that converts solar light energy into electrical energy. The photocurrent generated by a solar cell is mainly collected by grid lines on the surface of the cell. In the past, the screen plate was 325 mesh, the line crystal was 23 μm, and the film thickness was 20 μm. However, due to the setting of the existing screen board and the influence of the material of the printing screen board, the slurry cannot be printed on the surface of the silicon wafer, causing the grid line to be disconnected, which affects the flow of the current of the solar cell, thereby reducing the solar cell. The current will affect the sales and use of solar cells and reduce the income of enterprises. Contents of the invention [0003] ...

AI Technical Summary

Problems solved by technology

[0002] A solar cell is a device that converts solar light energy into electrical energy. The photocurrent generated by a solar cell is mainly collected by grid lines on the surface of the cell. In the past, the screen plate was 325 mesh, the line crystal was 23 μm, and the film thickness was 20 μm. However, due to the setting of the existing screen board and the influence of the material of the printing screen board, the slurry cannot be printed on the surface of the silicon wafer, causing the grid line to be disconnected, which affects the flow of the current of the solar cell, thereby reducing the solar cell. Current, affecting the sales and use of solar cells, reducing corporate income