Remote-Epitaxy of Multijunction Solar Cells on Graphene Coated III-V Substrates
[Technical Report, Final Report]
Massachusetts Institute of Technology
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Lightweight, flexible, and highly efficient solar cells are desirable for high altitude and extraterrestrial photovoltaic PV applications to maximize the specific power. In this project, we have shown that graphene interlayer can be utilized as an effective technique to grow single-crystal thin films and solar cells that can be easily exfoliated precisely at the graphene interface. We have employed lateral overgrowth of GaAs on nanopatterned graphene-coated Ge substrates, as well as remote epitaxy of GaAs on graphene-coated III-V substrates, from which GaAs thin film is grown and exfoliated at the graphene interface. In both cases, graphene is directly grown on the substrate, which has enabled transfer defect-free large-scale formation of graphene. Single junction solar cells are successfully demonstrated by remote epitaxy on GaAs buffer.
- Electrochemical Energy Storage