Multiple-bandgap vertical-junction architectures for ultra-efficient concentrator solar cells

Avi Braun, Alexis Vossier, Eugene A. Katz, Nicholas J. Ekins-Daukes, Jeffrey M. Gordon

Research output: Contribution to journalArticlepeer-review


A novel multiple-bandgap multi-terminal vertical-junction (side-illumination) architecture for concentrator solar cells is proposed and simulated, wherein each stacked sub-cell operates at its own maximum power point, without the need for tunnel diodes, current matching, lattice matching, metallization grids or spectrum splitting. Practical implementation is limited to indirect bandgap semiconductors (including Si and Ge), with a dramatic reduction in series resistance such that ultra-efficient operation at irradiance levels of thousands of suns appears tenable - rivalling in principle today's best multi-junction III-V cells.

Original languageAmerican English
Pages (from-to)8523-8527
Number of pages5
JournalEnergy and Environmental Science
Issue number9
StatePublished - 1 Sep 2012

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution


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