World Record Demonstration of > 30% Thermophotovoltaic Conversion Efficiency

Conference · Tue Jan 05 04:00:00 EST 2021

DOI:https://doi.org/10.1109/PVSC45281.2020.9300768· OSTI ID:1768273

Narayan, Tarun C.; Kuritzky, Leah Y.; Nizamian, Dustin P.; Johnson, Benjamin A.; Tervo, Eric J.; Young, Alexandra R.; Luciano, Cecilia; Arulanandam, Madhan K.; Kayes, Brendan M.; Perl, Emmett E.; Limpinsel, Moritz; Santhanam, Parthiban; Slack, Jonathan; Olavarria, Waldo; Carapella, Jeffrey; Young, Michelle; Wu, Cheng-Lun; Yu, Zhengshan J.; Holman, Zachary C.; King, Richard R. ; Steiner, Myles A.; Bierman, David M.; Ponec, Andrew J.; Briggs, Justin A.

Thermophotovoltaic (TPV) devices are solid-state heat engines that convert thermal radiation into electricity using semiconductor diodes, and have applications in energy storage, primary power conversion, and waste heat recovery. Higher temperature emitters and wider band gap photovoltaics (PVs) generally afford higher TPV efficiencies. High temperature emitters are accessible in thermal energy storage applications. We have demonstrated a world record 31% +/- 2% TPV conversion efficiency with a 0.9 cm2 GaAs-based PV device under a 2430 °C thermal emitter, producing an electrical output power of 2.23 W. Critical to the result was the cell’s high reflectance of photon energies below the device band gap. Unlike solar PV, for which sub-band gap (SBG) light is lost, a TPV cell can reflect and recycle SBG light to the thermal emitter. The demonstration was made on a custom-built measurement platform in which a ~100 cm2 graphite thermal emitter was heated under vacuum up to 2430 °C. The TPV efficiency was evaluated by comparing the measured electrical output power of the TPV with the calorimetrically measured total net power incident on the cell. The measured TPV efficiency as a function of thermal emitter temperature was corroborated by our full system modeling predictions. As far as the authors are aware, this is the highest TPV conversion efficiency ever measured, and device improvements should yield > 40% efficiency in the near future.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Advanced Research Projects Agency - Energy (ARPA-E)
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1768273
• Report Number(s): NREL/CP-5900-75958; MainId:5981; UUID:1481ab1c-fe41-ea11-9c2f-ac162d87dfe5; MainAdminID:19254
• Country of Publication: United States
• Language: English

Related Subjects

27 ARPA - Advanced Research Projects Agency-Energy (ARPA-E)
GaAs
III-V
long-duration energy storage
thermal energy storage
thermophotovoltaics