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Phonon Transport and Thermoelectricity in Defect-Engineered InAs Nanowires

Published online by Cambridge University Press:  21 February 2012

Annie Weathers ,
Arden L. Moore ,
Michael T. Pettes ,
Daniel Salta ,
Jaehyun Kim ,
Kimberly Dick ,
Lars Samuelson ,
Heiner Linke ,
Philippe Caroff  and
Li Shi
Annie Weathers
Affiliation:
Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas. Center for Nano and Molecular Science, The University of Texas at Austin, Austin, Texas.
Arden L. Moore
Affiliation:
Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas. Center for Nano and Molecular Science, The University of Texas at Austin, Austin, Texas.
Michael T. Pettes
Affiliation:
Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas. Center for Nano and Molecular Science, The University of Texas at Austin, Austin, Texas.
Daniel Salta
Affiliation:
Material Science and Engineering Graduate Program, The University of Texas at Austin, Austin, Texas. Center for Nano and Molecular Science, The University of Texas at Austin, Austin, Texas.
Jaehyun Kim
Affiliation:
Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas. Center for Nano and Molecular Science, The University of Texas at Austin, Austin, Texas.
Kimberly Dick
Affiliation:
The Nanometer Structure Consortium (nmC@LU) and Division of Solid State Physics, Lund University, S-22100 Lund, Sweden. Polymer & Materials Chemistry, Lund University, S-22100 Lund, Sweden.
Lars Samuelson
Affiliation:
The Nanometer Structure Consortium (nmC@LU) and Division of Solid State Physics, Lund University, S-22100 Lund, Sweden.
Heiner Linke
Affiliation:
The Nanometer Structure Consortium (nmC@LU) and Division of Solid State Physics, Lund University, S-22100 Lund, Sweden.
Philippe Caroff
Affiliation:
Institut d’Electronique, de Microelectronique et de Nanotechnologie, UMR CNRS 8520, F-59652 Villeneuve d’Ascq, France.
Li Shi
Affiliation:
Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas. Material Science and Engineering Graduate Program, The University of Texas at Austin, Austin, Texas. Center for Nano and Molecular Science, The University of Texas at Austin, Austin, Texas.
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Abstract

There have been reports of improvements in the thermoelectric figure of merit through the use of nanostructured materials to suppress the lattice thermal conductivity. Here, we report on a fundamental study of the combined effects of defect planes and surface scattering on phonon transport and thermoelectric properties of defect-engineered InAs nanowires. A microfabricated device is employed to measure the thermal conductivity and thermopower of individual suspended indium arsenide nanowires grown by metal organic vapor phase epitaxy. The four-probe measurement device consists of platinum resistance thermometers and electrodes patterned on two adjacent SiNx membranes. A nanowire was suspended between the two membranes, and electrical contact between the nanowire and the platinum electrodes was made with the evaporation of a Ni/Pd film through a shadow mask. The exposed back side of the device substrate allows for characterization of the crystal structure of the suspended nanowire with transmission electron microscopy (TEM) following measurement. The 100-200 nm diameter zincblende (ZB) InAs nanowire samples were grown with randomly spaced twin defects, stacking faults, or phases boundaries perpendicular to the nanowire growth direction, as revealed by transmission electron microscopy (TEM) analysis. Compared to single-crystal ZB InAs nanowires with a similar lateral dimension, the thermal conductivity of the defect-engineered nanowires is reduced by fifty percent at room temperature.

Keywords

thermoelectricnanostructurethermal conductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1404: Symposium W – Phonons in Nanomaterials–Theory, Experiments and Applications , 2012 , mrsf11-1404-w04-06
Copyright
Copyright © Materials Research Society 2012

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