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ECN publication
Optimized metal free back reflectors for high efficiency open rear c-Si solar cells
Ingenito, A.; Luxembourg, S.L.; Spinelli, P.; Liu, J.; Ortiz Lizcano, J.C.; Weeber, A.W.; Isabella, O.; Zeman, M.
Published by: Publication date:
ECN Solar Energy 1-1-2016
ECN report number: Document type:
ECN-W--15-023 Article (scientific)
Number of pages:

Published in: IEEE Journal of Photovoltaics (IEEE), , 2016, Vol.Vol.6 No.1, p.34-40.

The photovoltaic (PV) industry has recently become more oriented toward n-type c-Si solar cells. Among the different n-type solar cell architectures, bifacial cells are quickly emerging. The open-rear configuration of a bifacial device results in high transmittance (T) losses at long wavelengths (>1000 nm). This limitation is usually overcome at the module level either by using a bifacial encapsulation or by placing a reflective foil on the rear side. In this paper, we have investigated the application of a distributed Bragg reflector (DBR) and TiO2 -based white paint (WP) as alternative metal-free back-reflector options applied to the textured open-rear of bifacial n-Pasha cells. Because of the high T losses at long wavelengths of the DBR applied on textured surface,its design and fabrication is studied in detail. The dielectric (DBR and WP) and optimized Ag back-reflectors, which are used as a reference, are applied to bifacial n-Pasha cells, and their performance is evaluated. In particular, we demonstrate T below 20% at 1200 nm by optimizing the DBR thickness for textured surfaces. In addition, the optimized DBR and WP show performance comparable with a state-of-the-art Ag back-reflector. The highest increase of the conversion efficiency is measured for the WP backreflector:+0.34% absolute comparedwith n-Pasha measured with no-additional back-reflector.

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