Abstract
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 298–523K. 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 23mm×20mm and 12mm×10mm, respectively. The 20-pair p–n thermocouples in series generated a maximum open-circuit voltage output of 742.7mV and a maximum output power of up to 0.657μW at temperature difference ΔT=162K. In comparison, the 10-pair p–n thermocouples generated an output maximum open-circuit voltage of 467.9mV and a maximum output power of up to 0.346μW at ΔT=162K.
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