Harnessing Thermophotovoltaics for Efficient Energy Conversion of 40%: A Conversation with Dr. Henri

In this episode, we have the privilege to speak with Dr. Henri, a leading scientist in the field of Thermophotovoltaics (TPVs). TPVs, which convert infrared wavelength light to electricity, are recognized as potential game-changers for energy storage and conversion. They are ideally suited for higher temperature heat sources, surpassing the operational ranges of today's commonly used turbines in electricity production.The highlight of our conversation is the significant progress made in TPV efficiency. Dr. Henri's team has successfully fabricated and measured TPV cells with efficiencies exceeding 40%, a major leap from the previous highest record of 32%. These groundbreaking TPV cells are two-junction devices composed of III-V materials optimized for emitter temperatures ranging from 1,900–2,400 °C.Our guest also introduces us to the concept of band-edge spectral filtering, used in conjunction with highly reflective back surface reflectors, to reject unusable sub-bandgap radiation, which significantly contributes to the high efficiency of these TPVs.Through his work, Dr. Henri is opening a promising path for thermal energy grid storage, which could play a pivotal role in the decarbonization of the electricity grid. Listen in to explore the future of sustainable energy with this fascinating discussion on Thermophotovoltaics.Keywords: Dr. Henri, Thermophotovoltaics, Energy Conversion, Infrared Light, Energy Storage, Efficiency, Electricity Production, Sustainable Energy, Decarbonization.https://doi.org/10.1038/s41586-022-04473-y