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. 2016 Feb 6;9(2):96. doi: 10.3390/ma9020096

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Efficiency as function of the cell length for different light intensities (see legend in sun units, whereby one sun is 1000 W/m²): (a) calculated values; (b) normalized values.