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Title:
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Optimized metal free back reflectors for high efficiency open rear c-Si solar cells
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Author(s):
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Ingenito, A.; Luxembourg, S.L.; Spinelli, P.; Liu, J.; Ortiz Lizcano, J.C.; Weeber, A.W.; Isabella, O.; Zeman, M.
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Published by:
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Publication date:
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ECN
Solar Energy
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1-1-2016
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ECN report number:
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Document type:
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ECN-W--15-023
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Article (scientific)
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Number of pages:
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7
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Published in: IEEE Journal of Photovoltaics (IEEE), , 2016, Vol.Vol.6 No.1, p.34-40.
Abstract:
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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