Abstract
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 language | American English |
|---|---|
| Article number | 21 |
| Number of pages | 13 |
| Journal | PhotoniX |
| Volume | 1 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2020 |
Bibliographical note
Publisher Copyright:© 2020, The Author(s).
NREL Publication Number
- NREL/JA-5900-77609
Keywords
- Calibration
- Energy
- Heat engine
- Photovoltaics
- Thermophotovoltaics