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Decoupling the electrical conductivity, Seebeck coefficient and thermal conductivity in Bi2Te3/polycarbazole composite

AutorCaballero-Calero, Olga ; Pelegrín, César; Martínez, Sandra ; Aubouy, Laurent; Martín-González, Marisol S. ; Amantia, David
Fecha de publicaciónjun-2015
Citación7th EuroNanoForum Conference (2015)
ResumenPower generation and heating/cooling applications can be achieved through thermoelectric materials. However, the figure of merit (zT) which is directly related to the efficiency in thermoelectric materials remains low for most conventional bulk materials. During the last decade, many efforts were made to lower the thermal conductivity of the thermoelectric materials without affecting the electrical conductivity and the Seebeck coefficient by addition of intrinsically conductive polymers (ICP). The overall results found in such composites were the successful reduction of the thermal conductivity accompanied by a reduction of the electrical conductivity. This effect is due to the electronic component present in the thermal conductivity. In addition, in most thermoelectric materials the electrical conductivity is linked to the Seebeck coefficient in such manner that when one increases the other decreases and viceversa. In his work, we synthesized a 3,6-polycarbazole polymer (PCz) and used it to make Bi2Te3 composite. Thermoelectric measurements show a constant value in both thermal conductivity and Seebeck coefficient with the incremental addition of PCz. A good maximum power factor value of 648 μW m−1K−2 is reached for hybrid materials charged at 90% v/v content for Bi2Te3/PBz composite. The measured thermal conductivity is in the range of 0.5 W m−1K−1, which gives a zT at room temperature of 0.379, which is the highest, found for Bi2Te3/ICP composite to the best of our knowledge.
DescripciónPóster presentado en la 7th EuroNanoForum Conference, celebrada en Riga del 10 al 12 de junio de 2015.
URIhttp://hdl.handle.net/10261/135129
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