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ECN publication
Mercury: Industrial IBC Cell with Front Floating Emitter For 20.9% and Higher Efficiency
Guillevin, N.; Mewe, A.A.; Spinelli, P.; Burgers, A.R.; Janssen, G.J.M.; Loo, B. van; Kessels, E.; Vlooswijk, A.H.G.; Geerligs, L.J.; Cesar, I.
Published by: Publication date:
ECN Solar Energy 27-7-2015
ECN report number: Document type:
ECN-M--15-036 Conference Paper
Number of pages: Full text:
8 Download PDF  

This paper presents our recent progress in the development and characterization of our 6” industrial IBC Mercury cells. We gained more than 1% absolute in efficiency by optimizing the processes and design of the cells, resulting in 20.9% cell efficiency. Our cell process does not create a space or “gap” between the rear-side emitter and BSF areas, consequently the cells have a long length of high-high pn-junction on the rear side. We present a method to characterize the pn-junction recombination and quantify its contribution to Voc and pseudo-FF losses, one of the key performance parameters for optimisation of a gap-less IBC cell, and illustrate how this was central to the recent efficiency improvement. Together with these results, we briefly point out some key aspects of the design and production processes that ensure the industrial manufacturability of the cell and module. Finally, our roadmap towards >23% efficient Mercury cells is presented.

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