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Bifacial tandem solar cells

United States Patent

June 14, 2016
View the Complete Patent at the US Patent & Trademark Office
A method of fabricating on a semiconductor substrate bifacial tandem solar cells with semiconductor subcells having a lower bandgap than the substrate bandgap on one side of the substrate and with subcells having a higher bandgap than the substrate on the other including, first, growing a lower bandgap subcell on one substrate side that uses only the same periodic table group V material in the dislocation-reducing grading layers and bottom subcells as is present in the substrate and after the initial growth is complete and then flipping the substrate and growing the higher bandgap subcells on the opposite substrate side which can be of different group V material.
Wojtczuk; Steven J. (Lexington, MA), Chiu; Philip T. (Arlington, MA), Zhang; Xuebing (Acton, MA), Gagnon; Edward (Bedford, MA), Timmons; Michael (Durham, NC)
14/ 507,607
October 6, 2014
This invention was made with Government support under Subcontract No. NAT-9-88012-04 awarded by the United States Department of Energy. The Government has certain rights in the invention.