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ECN publication
High efficiency n-type metal wrap through cells and modules using industrial processes
Guillevin, N.; Gutjahr, A.; Geerligs, L.J.; Anker, J.; Bende, E.E.; Bennett, I.J.; Koppes, M.; Kossen, E.J.; Okel, L.A.G.; Slooff, L.H.; Broek, K.M.; Sp├Ąth, M.; Tool, C.J.J.; Aken, B.B. van; Romijn, I.G.; Jianming, Wang; Ziqian, Wang; Zhai, jinye; Zhiliang, Wan; Shuquan, Tian; Zhiyan, Hu ; Gaofei, Li ; Bo, Yu; Jingfeng, Xiong
Published by: Publication date:
ECN Solar Energy 22-9-2014
ECN report number: Document type:
ECN-M--14-049 Conference Paper
Number of pages: Full text:
6 Download PDF  

We report on our high efficiency n-type metal-wrap-through (MWT) cell and module technology. In this work, bifacial n-type MWT cells are produced by industrial processes in industrial full-scale and pilot-scale process equipment. The n-type cells benefit from high recombination lifetime in the wafer and bifaciality. When combined with MWT technology, high-power back-contact modules result, which can employ also very thin cells. We will discuss optimization of the MWT contact layout and impact on paste consumption, showing how MWT technology, like multi-busbar technology, can support very low paste consumption while increasing efficiencies at the same time. We report a cell conversion efficiency of 21% (in-house measurement on a not conducting, but reflecting chuck), a significant gain compared to our earlier work. Full-size modules (60 cells) have been made with power exceeding 300Wp and cell-to-module ratios of the different I-V parameters are discussed. Modules from cells with average efficiency of 20.9% are pending. This work shows that low-cost n-type bifacial cells are suitable for industrial high efficiency back-contact technology.

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