Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 13, Issue 10, Pages 3579-3591Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ee02579h
Keywords
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Funding
- Bpifrance (ENSO grant) [DOS0061368]
- European project ENSO (Energy for Smart Objects'')
- Electronic Components and Systems for European Leadership Joint Undertaking (ECSEL JU) program [692482]
- European Union's H2020 research and innovation program
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The ever-increasing number of connected objects requires novel ways to power them and make them fully autonomous. In this context, photovoltaic, piezoelectric or thermoelectric energy-harvesting technologies show great promises as they make possible the conversion of solar radiation, motion or thermal energy into useful electricity for charging micro-batteries for instance. Thermoelectric micro-generators (mu-TEGs) exhibit several key benefits, making them prime candidates for harvesting any temperature difference between their two exchange surfaces. However, their output power critically depends on the design of the mu-TEG, the minimization of the detrimental influence of the contact resistances and on the coupling of the mu-TEG with the heat source and heat sink. Here, we theoretically and experimentally demonstrate how these inherent difficulties can be mitigated using an innovative flexible mu-TEG design based on bismuth telluride thin films. Our experimental results show that an output power of 5.5 mu W per thermocouple can be generated under a temperature difference of only 5 K, in excellent agreement with predictions based on three-dimensional finite element analyses. These remarkable results rank our mu-TEG among the best micro-generators currently available.
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