Laser technology for higher-efficiency cells
Laser heats up local regions on the back side of a solar cell, the metallic aluminum there penetrates through the passivation layer and sinters together with the silicon substrate, forming aluminum back field and ohmic contact on the back side of crystalline silicon cells.
- Very fast laser processing time, suitable for volume manufacturing of high-efficiency cells
- Low backside Ohmic contact resistance
- High open circuit voltage Voc