The printed front &rear electrodes are fired and fused into the PN junction layer to form an ohmic contact through firing process,which allows the electrical energy collected by the fingers to flow out through the busbars.

By adjusting the Fermi energy level of the cell, controlling the total amount and valence state of H,improving the efficiency of H passivation and defect repair, to reduce the LID effect of P-type cells and improve the conversion efficiency of N-type cells.

The silver paste is printed to the surface of the cell by pressure, and becomes the positive and negative electrodes of the solar cell after drying and firing.

Al & Ag paste are printed on the surface of the wafer by screen printing technology,which becomes the positive & negative electrodes after drying and firing.