2010•Journal of the American Chemical SocietyRequires access

Enhancing Thermoelectric Performance of Ternary Nanocrystals through Adjusting Carrier Concentration

Yixin Zhao, Jeffrey S. Dyck, Brett M. Hernandez, Clemens Burda

Abstract

The carrier concentration of chemically synthesized Bi(2)Te(3)-based nanocrystals (NCs) is for the first time reported to be adjusted by forming ternary Bi(2-x)Sb(x)Te(3) NCs (x = 0.02, 0.05, 0.10, 0.20, 0.50, and 1.50) through partial substitution of Bi with Sb. Carrier concentrations of ternary Bi(2-x)Sb(x)Te(3) NCs were successfully adjusted by a factor of more than 10 controlled by the stoichiometric partial Sb/Bi substitution level. The power factors of the stoichiometric ternary Bi(2-x)Sb(x)Te(3) NCs improved three times compared to the parent Bi(2)Te(3) due to the carrier concentration adjustment.

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Key concepts: Ternary operation, Stoichiometry, Chemistry, Nanocrystal, Thermoelectric effect, Seebeck coefficient, Analytical Chemistry (journal), Ternary numeral system