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Shin, Ho Sun,Hamdou, Bacel,Reith, Heiko,Osterhage, Hermann,Gooth, Johannes,Damm, Christine,Rellinghaus, Bernd,Pippel, Eckhard,Nielsch, Kornelius The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.28
<P>We systematically investigated the role of topological surface states on thermoelectric transport by varying the surface-to-volume ratio (s/v) of Bi2Se3 nanowires. The thermoelectric coefficients of Bi2Se3 nanowires were significantly influenced by the topological surface states with increasing the s/v. The Seebeck coefficient of Bi2Se3 nanowires decreased with increasing the s/v, while the electrical conductivity increased with increasing the s/v. This implies that the influence of metallic surface states become dominant in thermoelectric transport in thin nanowires, and the s/v is a key parameter which determines the total thermoelectric properties. Our measurements were corroborated by using a two-channel Boltzmann transport model.</P>