Accurate Calibration of Thermophotovoltaic Efficiency

Zunaid Omair, Luis Pazos-Outon, Myles Steiner, Eli Yablonovitch

Research output: Contribution to journalArticlepeer-review

3 Scopus Citations


The new record efficiency in Thermophotovoltaics relies upon a highly reflective rear mirror. The excellent rear mirror boosts voltage by enhancing the luminescence extraction, and separately also reflects low energy photons, which would otherwise be useless in thermophotovoltaics. The reflected low energy photons reheat the thermal emitter, and regenerate above-bandgap energy photons. The efficiency calibration for such regenerative thermophotovoltaics depends on several factors, yet predominantly on the accurate measurement of the rear mirror reflectivity. Here, we report on the technique for accurate measurement of mirror reflectivity, and of record thermophotovoltaic efficiency 29.1 ± 0.6%, at 1207 °C.

Original languageAmerican English
Article number21
Number of pages13
Issue number1
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).

NREL Publication Number

  • NREL/JA-5900-77609


  • Calibration
  • Energy
  • Heat engine
  • Photovoltaics
  • Thermophotovoltaics


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