High Efficiency Multijunction Devices: Solar Cells, Thermophotovoltaics, LEDs

Research output: NRELPresentation


High-efficiency III-V multijunction solar cells require multiple alloys with optimal bandgaps and excellent material quality. However, many useful alloys are lattice-mismatched to available substrates, and require strain-engineering tricks to enable efficient use. To this extent, we have developed low-dislocation density metamorphic material and optically-thick stress-balanced superlattices, enabling access to a wide variety of III-V alloys. Combined with transparent tunnel junctions, these components allow optimizing multijunction devices for a variety of applications. We have designed multijunction cells for the G173G-terrestrial and AM0-space spectra with record 39.5% and 34.2% efficiency, respectively, and also thermophotovoltaic cells for blackbody spectra that reach over 40% TPV-efficiency. Finally, using these PV components, we demonstrate a multijunction LED with high quantum efficiency.
Original languageAmerican English
Number of pages27
StatePublished - 2023

Publication series

NamePresented at the SPIE Photonics West Conference, 28 January - 2 February 2023, San Francisco, California

NREL Publication Number

  • NREL/PR-5900-84346


  • high-efficiency
  • III-V
  • multijunction
  • multijunction LED
  • optically-thick stress-balanced superlattices
  • photovoltaic
  • PV
  • solar cell
  • space
  • thermophotovoltaic
  • TPV


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