Method of fabricating bifacial tandem solar cells

Title: Method of fabricating bifacial tandem solar cells

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.

Inventors:: Wojtczuk, Steven J; Chiu, Philip T; Zhang, Xuebing; Gagnon, Edward; Timmons, Michael

Issue Date:: 2014-10-07

OSTI Identifier:: 1160138

Assignee:: Masimo Semiconductor, Inc. (Irvine, CA) NREL

Patent Number(s):: 8,852,994

Application Number:: 12/800,824

Resource Relation:: Patent File Date: 2010 May 24

Research Org:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Org:: USDOE

Country of Publication:: United States

Language:: English

Subject:: 14 SOLAR ENERGY

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