Journal
SOLAR RRL
Volume 5, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202000763
Keywords
metalorganic vapor-phase epitaxy; multijunction solar cells; III-V on Si; III-V semiconductor
Funding
- German Federal Ministry of Education and Research through the project MehrSi [03SF0525A]
- European Unions' Horizon 2020 research and innovation program within the project SiTaSol [727497]
- German Environmental Foundation DBU
- Projekt DEAL
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The latest results of GaInP/GaAs/Si triple-junction solar cells are presented, with the implementation of transparent AlxGa1-xAsyP1-y step-graded metamorphic buffers leading to an increase in short-circuit current density and a new conversion efficiency record of 25.9%.
III-V/Si multi-junction solar cells are potential successors to the silicon single-junction cell due to their efficiency potential of up to 40% in the radiative limit.([1]) Herein, latest results of epitaxially integrated GaInP/GaAs/Si triple-junction cells are presented. To reduce parasitic absorption losses, which have limited the current density in the Si bottom cell in the previous devices, transparent AlxGa1-xAsyP1-y step-graded metamorphic buffers are investigated. Compared with previous GaAsyP1-y step-graded buffers, the transmittance is enhanced significantly, while no significant impact on the threading dislocation density is observed. Implemented into a new triple-junction solar cell, an increase in short-circuit current density from 10.0 to 12.2 mA cm(-2) is achieved, leading to a new record conversion efficiency of 25.9% under AM1.5g conditions.
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