Electric field modulation of thermovoltage in single-layer MoS2

We study electric field modulation of the thermovoltage in single-layer MoS2. The Seebeck coefficient generally increases for a diminishing free carrier concentration, and in the case of single-layer MoS2 reaches considerable large values of about S = −5160 μV/K at a resistivity of 490 Ω m. Further,...

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Bibliographic Details
Published in:Applied physics letters 2014-12, Vol.105 (25)
Main Authors: Dobusch, Lukas, Furchi, Marco M., Pospischil, Andreas, Mueller, Thomas, Bertagnolli, Emmerich, Lugstein, Alois
Format: Article
Language:English
Subjects:
Adsorbates
Applied physics
Carrier density
Degradation
Electric fields
Electron mobility
Low conductivity
Modulation
Molybdenum disulfide
Seebeck effect
Thermal conductivity
Thermoelectric materials
Time dependence
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Summary:We study electric field modulation of the thermovoltage in single-layer MoS2. The Seebeck coefficient generally increases for a diminishing free carrier concentration, and in the case of single-layer MoS2 reaches considerable large values of about S = −5160 μV/K at a resistivity of 490 Ω m. Further, we observe time dependent degradation of the conductivity in single layer MoS2, resulting in variations of the Seebeck coefficient. The degradation is attributable to adsorbates from ambient air, acting as p-dopants and additional Coulomb potentials, resulting in carrier scattering increase, and thus decrease of the electron mobility. The corresponding power factors remain at moderate levels, due to the low conductivity of single layer MoS2. However, as single-layer MoS2 has a short intrinsic phonon mean free path, resulting in low thermal conductivity, MoS2 holds great promise as high-performance 2D thermoelectric material.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4905014