Open AccessDiameter-dependent thermoelectric figure of merit in single-crystalline Bi nanowires
Author(s) -
Jeongmin Kim,
SeungHyun Lee,
Yuri M. Brovman,
Philip Kim,
Wooyoung Lee
Publication year - 2015
Publication title -
nanoscale
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.038
H-Index - 224
eISSN - 2040-3372
pISSN - 2040-3364
DOI - 10.1039/c4nr06412g
Subject(s) - nanowire , thermoelectric effect , materials science , figure of merit , seebeck coefficient , thermal conductivity , electrical resistivity and conductivity , thermoelectric materials , condensed matter physics , nanotechnology , optoelectronics , composite material , thermodynamics , physics , quantum mechanics
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.
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