Hybrid III-V/SiGe solar cells on Si substrates and porous Si substrates

A tandem GaAsP/SiGe solar cell has been developed employing group-IV reverse buffer layers grown on silicon substrates with a subsurface porous layer. Reverse buffer layers facilitate a reduction in the threading dislocation density with limited thicknesses, but ease the appearance of cracks, as obs...

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Bibliographic Details
Published in:arXiv.org 2022-05
Main Authors: Caño, Pablo, Hinojosa, Manuel, Cifuentes, Luis, Nguyen, Huy, Morgan, Aled, David Fuertes Marrón, García, Iván, Johnson, Andrew, Ignacio Rey Stolle
Format: Article
Language:English
Subjects:
Buffer layers
Crack propagation
Cracks
Dislocation density
Photovoltaic cells
Porous silicon
Shunt resistance
Silicon germanides
Silicon substrates
Solar cells
Threading dislocations
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Summary:A tandem GaAsP/SiGe solar cell has been developed employing group-IV reverse buffer layers grown on silicon substrates with a subsurface porous layer. Reverse buffer layers facilitate a reduction in the threading dislocation density with limited thicknesses, but ease the appearance of cracks, as observed in previous designs grown on regular Si substrates. In this new design, a porous silicon layer has been incorporated close to the substrate surface. The ductility of this layer helps repress the propagation of cracks, diminishing the problems of low shunt resistance and thus improving solar cell performance. The first results of this new architecture are presented here.
ISSN:2331-8422
DOI:10.48550/arxiv.2205.12664