today, contact-free infrared, hot air or la-ser soldering is used to connect tin-plated copper ribbons to the screen-printed metal-lization on the frontside and the backside of the adjacent cell. the resulting solar strings then are arranged onto a lamination foil and joined by. To ensure photovoltaic systems are able to compete with conventional fossil fuels, production costs of PV modules must be reduced and the efficiency of solar cells increased. Fraunhofer ILT develops industrial laser processes and the requisite mechanical components for a cost-effective solar cell manufacturing process with high process efficiencies. Solar cells. Additionally, laser beam micro welding using a fiber laser could be used in future applications for special cell types, like emitter-wrap-through (EWT) and metal-wrap-through (MWT) cells with higher processing speed and lower thermal influence on the cell. </p> <p> Selecting the right diode laser for photovoltaic manufacturing involves matching the wavelength, power stability, and beam quality to. increased stress on the cells, not to mention the high te ted, by laser welding an embossed aluminum (Al -printed silver (Ag) on the solar cell. Contact resistivity bel llowed by Al and Ag fusing together mid-way through the weld spot, as revealed by cross-sectional depth analysis.
