GaSb-Based Solar Cells for Full Solar Spectrum Energy Harvesting

Matthew P. Lumb*, Shawn Mack, Kenneth J. Schmieder, María González, Mitchell F. Bennett, David Scheiman, Matthew Meitl, Brent Fisher, Scott Burroughs, Kyu Tae Lee, John A. Rogers, Robert J. Walters

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


In this work, a multijunction solar cell is developed on a GaSb substrate that can efficiently convert the long-wavelength photons typically lost in a multijunction solar cell into electricity. A combination of modeling and experimental device development is used to optimize the performance of a dual junction GaSb/InGaAsSb concentrator solar cell. Using transfer printing, a commercially available GaAs-based triple junction cell is stacked mechanically with the GaSb-based materials to create a four-terminal, five junction cell with a spectral response range covering the region containing >99% of the available direct-beam power from the Sun reaching the surface of the Earth. The cell is assembled in a mini-module with a geometric concentration ratio of 744 suns on a two-axis tracking system and demonstrated a combined module efficiency of 41.2%, measured outdoors in Durham, NC. Taking into account the measured transmission of the optics gives an implied cell efficiency of 44.5%.

Original languageEnglish (US)
Article number1700345
JournalAdvanced Energy Materials
Issue number20
StatePublished - Oct 25 2017


  • GaSb
  • multijunction
  • solar cells
  • transfer-printing

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)


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