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B1: Contacting and insulation
Operation of thermoelectric generator (TEG) modules based on bismuth telluride at temperatures higher than 250°C is mostly limited by the melting point of the used solder. Although the thermoelectric parameters of bismuth telluride degrade for temperatures higher than 120 °C, the power output of the module can be increased with increase in the temperature difference. For this a temperature stable joining technique, especially for the hot side of the modules is required. The fabrication of TEG modules using joining technique based on pressure-assisted sintering of silver powder is described. The measurements of the thermal force, electrical resistance, and output power are presented. The investigations were performed for the hot side module temperatures up to 350°C and temperature differences higher than 300°C. Temperature cycling as well as results measured during extended high-temperature operation is carried out.
