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. 2012 Apr 3;3:770. doi: 10.1038/ncomms1772

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Copyright © 2012, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.

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Specific weight of various photovoltaic technologies for complete modules (left) and individual cells (right). Module data are taken from manufacturer-specified efficiency and weight of commercially available panels and should be representative: Kaneka 12V 55W PV Module, First Solar FS272, Sunforce 70W Pro Series, Bosch Solar Module c-Si M60 and Kyocera KD245Gx-LPB. Cell data were taken from published academic results. In many cases, the cell weight was not published and so was estimated from published layer thicknesses and known material densities, assuming 2% areal coverage for metal grid contacts17,18,23,24,25,26,27. For a direct comparison of cell efficiency, please see Green et al6.