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Title:
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Bifacial aspects of industrial n-Pasha solar cells
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Author(s):
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Published by:
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Publication date:
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ECN
Solar Energy
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30-6-2017
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ECN report number:
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Document type:
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ECN-W--17-016
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Article (scientific)
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Number of pages:
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4
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Published in: Japanese Journal of Applied Physics (The Japan Society of Applied Physics), , 2017, Vol.56, p.1-4.
Abstract:
Bifacial photovoltaic (PV) modules make optimal use of diffuse and ground-re?ected light. The gain in energy yield depends on both the local climatic conditions and the PV system layout. These determine the additional irradiance on the rear of the PV panels. The rear response of the
(laminated) solar cell(s) determines how much additional energy this rear irradiance generates. Based on our experiments and simulations, the main parameters that determine the bifaciality factor of solar cells with a front side junction are the rear metal coverage, the base resistivity and the diffusion pro?le on the rear. These will be evaluated and discussed in this paper. Front-junction solar cells with low base resistivity have a lower short circuit current when illuminated from the rear due to enhanced recombination in the BSF. Stencil printed rear metallization yields a higher bifaciality factor compared to screen printed by reducing the metal coverage and consumption and maintaining the front side ef?ciency. For our optimized 239 cm
bifacial cell we estimate that the output with 20% contributed by the rear side is equivalent to that of a 24.4% ef?cient monofacial cell. © 2017 The Japan Society of Applied Physics
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