Abdenour, AchourChen, KanReece, Michael J.Huang, Zhaorong2017-12-202017-12-202017-11-10Abdenour Achour, Kan Chen, Michael J. Reece, Zhaorong Huang, Enhanced thermoelectric performance of Cs doped BiCuSeO prepared through eco-friendly flux synthesis. Journal of Alloys and Compounds, Volume 735, 2018, Pages 861-8690925-8388https://doi.org/10.1016/j.jallcom.2017.11.104https://dspace.lib.cranfield.ac.uk/handle/1826/12803The synthesis of BiCuSeO oxyselenides by a flux method in air has been investigated. A maximum power factor of 230 μWm−1K−2 and a very low thermal conductivity of 0.42 Wm−1K−1 were obtained, leading to a high ZT value of 0.37 at 680 K for pristine BiCuSeO. With Cs doping, a large enhancement in electrical conductivity coupled with a moderate decrease in Seebeck coefficient lead to a power factor of 340 μWm−1K−2 at 680 K. In addition, Cs doping reduced the thermal conductivity further to 0.35 Wm−1K−1 at 680 K. The combination of higher power factor and reduced thermal conductivity results in a high ZT value of 0.66 at 680 K for Bi0.995Cs0.005CuSeO.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/BiCuSeOThermoelectric materialsCs dopingFlux synthesisThermal conductivityArticle