Metal wrap-through cell and module design optimization

Back-contact modules made using a conductive back-sheet foil have a number of advantages over conventional H-pattern modules including a higher power output, compatibility with very thin cells and efficient and high yield manufacturing. In this paper, we present the results of efficiency and material optimization for cost reduction when using metal-wrap-through (MWT) cells. This includes the use of an aluminum conductive back-sheet, a thinner encapsulant for reduced conductive adhesive consumption and an increased number of vias in the cell. Experimental and modelling results show that the cell and module performance can be improved at a reduced module costs (4% lower than current cost) whilst retaining reliability.