| dc.description.abstract | In recent years, thermoelectric power generation has attracted a lot of attention due to energy crisis and the demand of renewable energy. Thermoelectric material is a material that can directly convert electrical energy and thermal energy. These materials can generate electromotive force under a sufficient temperature difference to achieve the phenomenon of generating electricity from heat. The next stage of thermoelectric materials is thermoelectric devices and modules. Multiple pairs of N-type and P-type thermoelectric blocks are connected in series, so that the voltages generated by each thermoelectric material under the temperature difference can be added together, which can generate effective and usable electrical energy. However, the application condition of the thermoelectric module is in a high temperature environment, and the characteristics of the junction of the thermoelectric blocks in the module are very important. The contact metal layer is placed between the thermoelectric material and the electrodes as the solder to prevent the elements from diffusing into the thermoelectric blocks at high temperature. The properties of the contact metal layer are critical to the overall performance of the thermoelectric module.
This study is on the N-type Mg2(SiSn) thermoelectric materials, looking for different kinds of contact metals. The materials must have low resistivity, high mechanical strength, good thermal stability, and do not have too much reaction with the thermoelectric blocks itself. Then, through different production processes, such as coating, powder pressing, cold pressing, annealing, etc., it is bonded to the surface of the N-type Mg2(SiSn) thermoelectric material. Finally, the contact metals with excellent performance were selected to make three sets of single-pair thermoelectric device/elements, and the open-circuit voltage, short-circuit current and resistance were measured. | en_US |