In the manufacturing process of solar cells, in order to prepare solar cell contact electrodes, it is necessary to print metal paste on silicon wafers using screen printing technology. After the sintering process, front and back electrodes are formed on the surface of the solar cell through which the solar cell's current is collected and transmitted. Through the system software, the number of grid lines and pyramids on the photovoltaic cell can be detected, helping users master the quality of solar cell cleaning and texturing, screen printing process, etc

  The process steps of screen printing are: printing the back electrode with silver paste → drying→ printing the back field with aluminum paste → drying→ and printing the front gate with silver paste → drying. The printing pattern is required to be complete, clear, uniform and symmetrical.

When screen printing, the printing pattern should be designed first and made into a screen plate. The mesh that needs to form the graphic part of the mesh plate is transparent, and the mesh of the non-graphic part is occluded. When printing, spread the slurry on the mesh plate, and the blade of the scraper is close to the screen surface of the mesh plate to scrape the slurry laterally, and apply appropriate pressure to make the mesh plate contact with the silicon wafer, and the slurry is squeezed out of the mesh hole and adhered to the silicon wafer. Because there is a gap between the mesh plate and the silicon wafer, the mesh plate will use its own tension to contact the silicon wafer and immediately break away from the silicon wafer springback, and the slurry of the extruded mesh is separated from the wire mesh, and the slurry is adhered to the mesh plate in accordance with the graphic limited area of the mesh plate on the surface of the silicon wafer.

The electrode of solar cells made by screen printing method has the characteristics of low production cost and high production volume, and is a commonly used method in large-scale production