Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 10, Issue 8, Pages 596-599Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201600157
Keywords
III-V semiconductors; silicon; GaAsP; SiGe; tandem solar cells; light trapping
Funding
- Australian Government through Australian Renewable Energy Agency (ARENA) [ARENA1-UFA0001]
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A GaAsP/SiGe tandem solar cell on Si substrate has been further fabricated using light trapping techniques, such as texturing and adding a back surface reflector, and thinning the Si substrate. This is of importance to increase the J(sc) of the Si0.18Ge0.82 bottom cell in this tandem system since bottom cell is current limiting. The J(sc) of the bottom cell has been increased by relative 7.4%. This current improvement leads to a predicted efficiency of near 21% for this tandem device, with an absolute efficiency improvement of 0.3% over previous results without light trapping processes. The current of the bottom cell can be further improved by optimizing the bottom cell structure and texturing process, further thinning the Si substrate and increasing Ge concentration. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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