Performance Improvement of Front Junction N-type PERT Solar Cell by Wafer Thinning

We fabricated front junction n-bifacial PERT cells using thin wafers to investigate effects on cell performances by wafer thinning. In the case illuminated from front side, η of 83μm thick cell was almost same as 131μm thick cell. However, η of the thin cell illuminated from rear side was much higher than the thick cell. The reason is thought that the wafer thinning improves the collection of photo-carriers in the vicinity of rear side. This result suggests that the wafer thinning will not only reduce the cost, but also improve the actual amount of power generation of bifacial modules.