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http://dx.doi.org/10.3795/KSME-B.2015.39.10.825

Thermal Conductivity Measurement of Ge-SixGe1-x Core-Shell Nanowires Using Suspended Microdevices  

Park, Hyun Joon (Gwangju Institute of Science and Technology)
Nah, Jung hyo (Chungnam Nat'l Univ.)
Tutuc, Emanuel (The Univ. of Texas at Austin)
Seol, Jae Hun (Gwangju Institute of Science and Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.39, no.10, 2015 , pp. 825-829 More about this Journal
Abstract
Theoretical calculations suggest that the thermoelectric figure of merit (ZT) can be improved by introducing a core-shell heterostructure to a semiconductor nanowire because of the reduced thermal conductivity of the nanowire. To experimentally verify the decrease in thermal conductivity in core-shell nanowires, the thermal conductivity of Ge-SixGe1-x core-shell nanowires grown by chemical vapor deposition (CVD) was measured using suspended microdevices. The silicon composition (Xsi) in the shells was measured to be about 0.65, and the remainder of the germanium in the shells was shown to play a role in decreasing defects originating from the lattice mismatch between the cores and shells. In addition to the standard four-point current- voltage (I-V) measurement, the measurement configuration based on the Wheatstone bridge was attempted to enhance the measurement sensitivity. The measured thermal conductivity values are in the range of 9-13 W/mK at room temperature and are lower by approximately 30 than that of a germanium nanowire with a comparable diameter.
Keywords
Nanowire; Germanium; Silicon; Core-Shell Structure; Thermal Conductivity; Wheatstone Bridge;
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