| dc.description.abstract | Industrial development is advancing rapidly, exacerbating environmental concerns due to the predominant use of fossil fuels for energy generation. Issues such as energy shortages and climate change have become pressing topics of discussion. In the realm of renewable energy, thermoelectric materials are emerging as a promising solution. By leveraging the Seebeck effect and the Peltier effect, these materials can harness temperature differentials to generate a potential difference, facilitating the direct conversion of heat into electricity and vice versa.
With escalating energy demands and the urgent need to reduce carbon emissions, current research in thermoelectric power generation focuses on enhancing the ZT value to improve energy conversion efficiency. This involves advancements in materials and structural designs, showcasing potential applications in waste heat recovery, wearable electronics, aerospace, and environmental monitoring. The pivotal role of thermoelectric materials in green energy conversion is increasingly acknowledged, with expectations of widespread adoption across industrial and civilian sectors.
This thesis specifically investigates P-type Mg2(SiSn) thermoelectric materials, examining how various metal contacts impact the performance characteristics and mechanical robustness of samples. The study aims to optimize bonding methods for these samples, integrating P-type and N-type materials into single-pair elements and assembling them into thermoelectric modules capable of generating 1V of output. The electrical properties of these modules are meticulously measured and analyzed.
Among the metal contact configurations explored, the combination of Al foil and Cu sheet with pure samples exhibited superior integration, with Cu sheet demonstrating exceptional mechanical strength in welding tests. Using a square tungsten steel mold, metal, P-type powder, and N-type powder were cold-pressed into blocks and annealed at high temperatures. The resulting single-pair element achieved an average voltage of approximately 0.032523V and an average Seebeck coefficient of about 265.926 μV/K. Utilizing silver paste and WU-4 solder, with mica sheets as insulators, the four-pair element delivered a voltage of 0.101904V and a Seebeck coefficient of approximately 640.906 μV/K. Ultimately, the assembly of a 40-pair PN thermoelectric module achieved an output of 0.987672V and a Seebeck coefficient of 11957.29 μV/K. | en_US |