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We report a solution-processed, ligand supported synthesis of 15-20 nm thickSb(2-x)Bi(x)Te3 nanoplatelets. After complete ligand removal by a facileNH3-based etching procedure, the platelets are spark plasma sintered to ap-type nanostructured bulk material with preserved crystal grain sizes. Due tothis nanostructure, the total thermal conductivity is reduced by 60 % incombination with a reduction in electric conductivity of as low as 20 % ascompared to the bulk material demonstrating the feasibility of the phonon-glasselectron-crystal concept. An enhancement in the dimensionless thermoelectricfigure of merit of up to 15 % over state-of-the-art bulk materials is achievedmeanwhile shifting the maximum to significantly higher temperatures.

ZT enhancement in solution-grown Sb(2-x)Bi(x)Te3 nanoplatelets