CMOS, concentrating photovoltaic, III-V substrates, Ge substrates, spectrum splitting
Concentrated photovoltaic technology
Traditional solar cells in concentrating systems use expensive III-V or Ge substrates, require complicated film growth techniques for lattice matching and forming tunnel junctions, and necessitate current matching that is difficult to optimize for varying weather conditions.
This invention describes an integrated approach which splits the solar spectrum into different bands directed toward discrete solar cells with spectrally matched bandgaps. This allows cells to be optimized independently. For each discrete solar cell, a single crystalline thin film Ge cell can be grown on top of a Si substrate to be used as a virtual substrate, replacing the Ge substrate.
US Patent Application Number 13/651140, filed on October 12, 2012
PCT Patent Application Number PCT/US2012/060082, filed on October 12, 2012
Last revised: April 30, 2013