Diameter-dependent thermoelectric figure of merit in single-crystalline Bi nanowires

Jeongmin Kim, Seunghyun Lee, Yuri M. Brovman, Philip Kim, Wooyoung Lee

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The diameter-dependent thermoelectric properties of individual single-crystalline Bi nanowires grown by the on-film formation of nanowires method have been investigated. The electrical resistivity, Seebeck coefficient, and thermal conductivity were measured as functions of the nanowire diameter using an individual nanowire device. The thermoelectric figure of merit (ZT) calculated from the measured thermoelectric properties shows an increase from the bulk value to a maximum value of 0.28 at 109 nm-diameter, followed by a decrease upon further decreasing the diameter. This non-monotonic diameter dependence of ZT in Bi nanowires reveals simultaneous positive and negative contributions to the thermoelectric efficiency, driven by the change in intrinsic properties, which originates from the diameter-dependent classical and quantum size effects.

Original languageEnglish
Pages (from-to)5053-5059
Number of pages7
JournalNanoscale
Volume7
Issue number11
DOIs
Publication statusPublished - 2015 Mar 21

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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