Full thermoelectric characterization of InAs nanowires using MEMS heater/sensors

Precise measurements of a complete set of thermoelectric parameters on a single indium-arsenide nanowire (NW) have been performed using highly sensitive, micro-fabricated sensing devices based on the heater/sensor principle. The devices were fabricated as micro electro-mechanical systems consisting...

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Bibliographic Details
Published in:Nanotechnology 2014-08, Vol.25 (30), p.305702-9
Main Authors: Karg, S F, Troncale, V, Drechsler, U, Mensch, P, Das Kanungo, P, Schmid, H, Schmidt, V, Gignac, L, Riel, H, Gotsmann, B
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Devices
Exact sciences and technology
General equipment and techniques
Heaters
Heating equipment
Indium arsenides
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
MEMS
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
nanowire
Nanowires
Physics
Quantum wires
Sensors
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Thermal conductivity
Thermal properties of condensed matter
Thermal properties of small particles, nanocrystals, nanotubes
thermal transport
Thermoelectricity
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Summary:Precise measurements of a complete set of thermoelectric parameters on a single indium-arsenide nanowire (NW) have been performed using highly sensitive, micro-fabricated sensing devices based on the heater/sensor principle. The devices were fabricated as micro electro-mechanical systems consisting of silicon nitride membranes structured with resistive gold heaters/sensors. Preparation, operation and characterization of the devices are described in detail. Thermal decoupling of the heater/sensor platforms has been optimized reaching thermal conductances as low as with a measurements sensitivity below . The InAs NWs were characterized in terms of thermal conductance, four-probe electrical conductance and thermopower (Seebeck coefficient), all measured on a single NW. The temperature dependence  of the parameters determining the thermoelectric figure-of-merit of an InAs NW was acquired in the range 200-350 K featuring a minor decrease of the thermal conductivity from 2.7 W to 2.3 W .
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/25/30/305702