Investigation the Electrical Properties of Pb, Fe Co-Doped BiCuSeO Prepared by Solid-State Reaction

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Thermoelectric materials, a class of advanced functional materials, possess the remarkable capability to directly interconvert thermal and electrical energy. This unique property endows them with highly promising application potential across the domains of thermoelectric power generation and precision based thermal management. As a thermoelectric material containing oxides, BiCuSeO has the characteristics of hightemperature stability, oxidation resistance, non-toxicity, and easy sintering, and is considered a potential high-performance thermoelectric material. In this paper, BiCuSeO samples codoped with Pb and Fe were synthesized by solid-state reaction. X - ray diffraction (XRD), scanning electron microscopy (SEM), and electrical property testing were employed to thoroughly analyze the samples. The results show that the solid-state reaction method can rapidly synthesize single-phase BiCuSeO compounds. The synthesized samples contain many micropores, and the grain sizes are mostly at the micron and nanometer levels. The codoping of Fe and Pb has significantly optimized the electrical resistivity of BiCuSeO compound, reducing it by two orders of magnitude compared to undoped BiCuSeO. When the preparation temperature is$600{ }^{\circ} \mathrm{C}$, the sample Bi0.92Pb$_{0.08}$Cu$_{0.09}$Fe$_{0.01}$SeO achieves the highest Seebeck coefficient of approximately$146.6 \mu ~\mathrm{W} \cdot\left(~\mathrm{m} \cdot ~\mathrm{K}^{2}\right)^{-1}$and the sample achieved a maximum power factor of$833.01 \mu ~\mathrm{W} \cdot\left(~\mathrm{m} \cdot ~\mathrm{K}^{2}\right)^{-1}$, which is nearly 17 times higher than the undoped BiCuSeO.

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