Silver plated-coated Copper and Tin powder Low Cost Rear Ag paste

摘要

Low cost Rear Ag paste is made by silver plated-coated Copper and Tin powder to replace part of pure Ag powderin the paste to reduce the cost of solar cell manufacture and also improve the adhesion of the solar cell busbar. The key issue touse Ag coated copper and tin is the oxidization of cooper and tin during the drying and firing pr°Cess which will reduce thesolderability and adhesion by using this system. We use N2 protection during drying and firing pr°Cess to prevent the oxidizationof cooper and tin. Therefore, the solderability and adhesion has been increased a lot to achieve the industry testing standard. AlsoRs reduction is also a big achievement for this paste system.