Abstract
We studied the influence of doping HfTe5 with 5% Ti on electric (resistivity and the Hall effect) and thermoelectric transport properties (the Seebeck coefficient, magneto-thermoelectric power, and Nernst effect). The properties of 5% Ti-doped HfTe5 do not change much. Nernst coefficients larger than magneto-thermoelectric power were observed in a temperature range near the compensation temperature at which the Seebeck coefficient vanishes. This indicates that a two-carrier conduction model could describe our experimental results. Owing to the high thermoelectric performance, thermopiles were made on a printed circuit board based on doped and undoped HfTe5. A large Seebeck voltage was obtained at room temperature. It became even larger in a low temperature range and presented strong magnetic field dependence.
Highlights
In recent years, the issue of energy has received more and more attention because of the ubiquity of information technology
Efforts have been made for the optimization of thermoelectric power generators in many ways, such as the geometry structure of the thermopiles,6 polymer gels with a tunable ionic Seebeck coefficient,7 and the reduction of a heat source or sink thermal resistances for high performance thermoelectric coolers
All thermoelectric measurements were performed on a homebuilt setup, and the electric transport measurements were performed on a Quantum Design Physical Property Measurement System (PPMS)
Summary
The issue of energy has received more and more attention because of the ubiquity of information technology. Linden et al. have recently proposed the use of fabric-based thermopiles as thermoelectric generators that can take advantage of the heat of the human body to power wearable electronic devices.. Efforts have been made for the optimization of thermoelectric power generators in many ways, such as the geometry structure of the thermopiles, polymer gels with a tunable ionic Seebeck coefficient, and the reduction of a heat source or sink thermal resistances for high performance thermoelectric coolers.. Topological quantum materials have begun to attract growing attention because the novel electronic structure of topological insulators opens new opportunities for thermoelectric materials with high performance.. The large thermopower of these materials shows their potential to be used as thermoelectric applications In these materials, applying an external magnetic field can further enhance high-thermoelectric performance.
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