TEGs as self-sufficient power supply for sensors and microelectromechanical systems
2017
Thermoelectric generators (TEGs) can be used as robust and maintenance-free power supplies. The power
density of currently available TEGs is about 1 W/cm² and sufficient for many low power
sensor/microelectromechanical systems. By changing the sintering atmosphere and using a special set-up a
standard industry process used for insulating or metallic materials was transferred to thermoelectric FeSi 2 -,
Mg 2 Si- and SiGe-material. Thereby, separated compact- and sintering steps allows a mass producible process
in contrast to the almost exclusively used SPS- and FAST-processes. All three materials have been further
processed to functional TEG-modules by sawing, bonding and electrically contacting with TiSi 2 . Thereby, the
mechanical bond as well as the electrical contacts are thermally stable up to 800 °C. The general functionality
and the characteristics of the final TEG-modules were confirmed by analysis in a measurement setup that
simulates an application in a realistic environment.
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