Efficient Light-Trapping in Ultrathin GaAs Solar Cells Using Quasi-Random Photonic Crystals

Jeronimo Buencuerpo, Theresa Saenz, Mark Steger, Michelle Young, Emily Warren, John Geisz, Myles Steiner, Adele Tamboli

Research output: Contribution to journalArticlepeer-review

15 Scopus Citations


Ultrathin solar cells reduce material usage and allow the use of lower-quality materials thanks to their one order of magnitude smaller thickness than their conventional counterparts. However, efficient photonic light-trapping is required to harvest the incident light efficiently for an otherwise insufficient absorber thickness. Quasi-random photonic crystals are predicted to have high efficient light-trapping while being more robust under angle and thickness variations than simple photonic crystals. Here we experimentally demonstrate a light-trapping solution based on quasi-random photonic crystals fabricated by polymer blend lithography. We control the average lattice parameter by modifying the spin-coating speed. We demonstrate an ultrathin GaAs cell of 260 nm with a rear quasi-random pattern with submicron features, and a Jsc = 26.4 mA/cm2 and an efficiency of 22.35% under the global solar spectrum.

Original languageAmerican English
Article number107080
Number of pages9
JournalNano Energy
StatePublished - 1 Jun 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

NREL Publication Number

  • NREL/JA-5900-80577


  • GaAs
  • Photonic crystals
  • Photovoltaics
  • Quasi-random
  • Ultrathin


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