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arXiv · 1406.4569

Intrinsic Transport Properties of Electrons and Holes in Monolayer Transition Metal Dichalcogenides

Zhenghe Jin·Xiaodong Li·Jeffrey Thomas Mullen·Ki Wook Kim
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Abstract

Intrinsic electron- and hole-phonon interactions are investigated in monolayer transition metal dichalcogenides MX$_2$ (M=Mo,W; X=S,Se) based on a density functional theory formalism. Due to their structural similarities, all four materials exhibit qualitatively comparable scattering characteristics with the acoustic phonons playing a dominant role near the conduction and valence band extrema at the K point. However, substantial differences are observed quantitatively leading to disparate results in the transport properties. Of the considered, WS$_2$ provides the best performance for both electrons and holes with high mobilities and saturation velocities in the full-band Monte Carlo analysis of the Boltzmann transport equation. It is also found that monolayer MX$_2$ crystals with an exception of MoSe$_2$ generally show hole mobilities comparable to or even larger than the value for bulk silicon at room temperature, suggesting a potential opportunity in p-type devices. The analysis is extended to estimate the effective deformation potential constants for a simplified treatment as well.

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Zhenghe Jin, Xiaodong Li, Jeffrey Thomas Mullen, Ki Wook Kim. 2014-06-18. Intrinsic Transport Properties of Electrons and Holes in Monolayer Transition Metal Dichalcogenides. https://doi.org/10.1103/physrevb.90.045422

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