Metal-Wrap-Through Laser Drilling
Laser drilling method is used for high efficiency solar cell fabrication including MWT (Metal Wrap Through) and EWT (Emitter Wrap Through) processes. In order to reduce the shadowing effect of the screen printing lines on the front side, this process uses laser to drill holes and moves metal electrodes from frontside to the backside.
- Decreased shadowing effect of screen-printed lines on frontside, increased area absorbing sunlight, hence higher energy conversion efficiency
- Very fast laser processing time, suitable for high-volume production
- High-quality thru holes