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One-Dimensional Quantum Confinement Effect Modulated Thermoelectric Properties in InAs Nanowires

Yuan TianDepartment of Physics, Case Western Reserve University, Cleveland, Ohio 44106,#R#United StatesM. R. SakrDepartment of Physics, Case Western Reserve University, Cleveland, Ohio 44106, United StatesJesse KinderDepartment of Physics, Case Western Reserve University, Cleveland, Ohio 44106, United StatesLiang DongDepartment of Physics, Case Western Reserve University, Cleveland, Ohio 44106, United StatesM. J. MacDonaldDepartment of Physics, Case Western Reserve University, Cleveland, Ohio 44106, United StatesRichard L. J. QiuDepartment of Physics, Case Western Reserve University, Cleveland, Ohio 44106, United StatesHongjun GaoInstitute of PhysicsXuan GaoDepartment of Physics, Case Western Reserve University, Cleveland, Ohio 44106, United States

2012en

ABI

Annotatsiya

We report electrical conductance and thermopower measurements on InAs nanowires synthesized by chemical vapor deposition. Gate modulation of the thermopower of individual InAs nanowires with a diameter around 20 nm is obtained over T = 40-300 K. At low temperatures (T < ∼100 K), oscillations in the thermopower and power factor concomitant with the stepwise conductance increases are observed as the gate voltage shifts the chemical potential of electrons in InAs nanowire through quasi-one-dimensional (1D) subbands. This work experimentally shows the possibility to modulate semiconductor nanowire's thermoelectric properties through 1D subband formation in the diffusive transport regime for electron, a long-sought goal in nanostructured thermoelectrics research. Moreover, we point out the scattering (or disorder) induced energy level broadening as the limiting factor in smearing out the 1D confinement enhanced thermoelectric power factor.

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Identifikatorlar

DOI: 10.1021/nl304194c

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