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Title:
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Improvements in advanced industrial n-type solar cells and modules
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Author(s):
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Romijn, I.G.; Aken, B.B. van; Anker, J.; Bennett, I.J.; Geerligs, L.J.; Guillevin, N.; Gutjahr, A.; Kossen, E.J.; Koppes, M.; Tool, C.J.J.; Renes, M.; Venema, P.; Ommen, N. van; Bakker, J.
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Published by:
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Publication date:
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ECN
Solar Energy
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22-9-2014
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ECN report number:
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Document type:
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ECN-V--14-014
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Article
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Number of pages:
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Full text:
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10
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Download PDF
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Published in: Photovoltaics International (PV-Tech), , 2014, Vol.25 (September 2014), p.58-68.
Abstract:
This paper reports on the progress of R&D in two n-type cell and module concepts: the n-Pasha solar cell and bifacial module, and the n-MWT (metal wrap-through) cell and module. Both are part of ECN’s technology platform, acting as a roadmap for research in n-type Cz cells and modules. The technology platform also encompasses low-cost IBC solar cells. In the case of n-Pasha, recent developments involve improved stencil- printed metallization, resulting in an increased Isc and Voc and efficiencies of up to 20.5%. For the bifacial module aspect, research has been done on the effect of different albedo on the module output. A gain of 20%rel in module output power was obtained with an optimized background, increasing the module power from
314W to 376W. As regards n-MWT cells, the front-side metallization pattern has been changed
significantly. The number of vias for conducting the emitter current to the rear has been
increased from 16 to 36, resulting in reduced lengths of busbars and fingers and consequently an increase in FF. At the same time, the metal coverage on the front side has been reduced from 5% to 3% of the total area, leading to a gain in Isc and Voc and a significant reduction in Ag
consumption. All these factors will result in a lower cost/Wp. For the improved n-MWT design,
average efficiencies of 20.8% over a large batch (134) of cells have been obtained, with the
highest recorded efficiencies being 21.0%.
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