Microscale Contact Formation by Laser Enhanced Contact Optimization

A technique to improve contacts of solar cells laser enhanced contact optimization (LECO) has been studied in terms micro scale formation at industrial PERC cells. High-resolution diagnostics by focused ion beam techniques and scanning electron transmission microscopy indicate the LECO-induced microscopic buried interface between screen-printed silver finger silicon wafer. large quantity these where found exclusively for LECO processed Target preparation three-dimension cross-section investigation reveal an interdiffusion Ag Si material as underlying root cause improved local resistivity. We propose a descriptive model ohmic maintaining surface passivation.