We report the fabrication and measurement of thermophotovoltaic (TPV) cells with efficiencies of >40%. The TPV cells are 2-junction devices with high-quality 1.0-1.4 eV materials that target high emitter temperatures of 1900-2400{deg}C. These cells can be integrated into a TPV system for thermal energy grid storage (TEGS) to enable dispatchable renewable energy. With these new TPV cells, TEGS has a pathway to reach sufficiently high efficiency and sufficiently low cost to enable full decarbonization of the grid. Furthermore, the high demonstrated efficiency gives TPV the potential to compete with turbine-based heat engines for large-scale power production with respect to both cost and performance, thereby enabling possible usage in natural gas or hydrogen-fueled electricity production.
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