Lead–ytterbium–telluride thin films prepared using thermal evaporation technique for thermal sensing applications

Add time:07/31/2019    Source:sciencedirect.com

p-Pb0.925Yb0.075Te:Te and n-Pb0.925Yb0.075Te powders were used in a standard synthesized solid-state microwave method to fabricate thermally evaporated thin films. The composition and microstructure of the films were studied by using X-ray diffraction and field emission scanning electron microscopy. As well as, electrical properties of the as-deposited film in terms of Seebeck coefficient, electrical conductivity, and thermoelectric (TE) power factor have been characterized at a range of 298–523 K. The micro-thermoelectric devices consisted of 20-pair and 10-pair p-Pb0.925Yb0.075Te:Te and n-Pb0.925Yb0.075Te thin films on glass substrates, respectively. The overall size of the thin-film TE generators, which comprised 20 and 10 pairs of legs connected by aluminum electrodes were 23 mm × 20 mm and 12 mm × 10 mm, respectively. The 20-pair p–n thermocouples in series generated a maximum open-circuit voltage output of 742.7 mV and a maximum output power of up to 0.657 μW at temperature difference ΔT = 162 K. In comparison, the 10-pair p–n thermocouples generated an output maximum open-circuit voltage of 467.9 mV and a maximum output power of up to 0.346 μW at ΔT = 162 K.

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