Universal ac conduction in large area atomic layers of CVD-grown MoS2
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Here, we report on the ac conductivity [σ’(ω); 10 mHz < ω < 0.1 MHz] measurements performed on atomically thin, two-dimensional layers of MoS2 grown by chemical vapor deposition (CVD). Σ’(ω) is observed to display a “universal” power law, i.e., σ’(ω) ∼ ωs measured within a broad range of temperatures, 10 K< T <340 K. The temperature dependence of ‘‘s” indicates that the dominant ac transport conduction mechanism in CVD-grown MoS2 is due to electron hopping through a quantum mechanical tunneling process. The ac conductivity also displays scaling behavior, which leads to the collapse of the ac conductivity curves obtained at various temperatures into a single master curve. These findings establish a basis for our understanding of the transport mechanism in atomically thin, CVD-grown MoS2 layers.
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Ghosh, S., Najmaei, S., Kar, S., et al.. "Universal ac conduction in large area atomic layers of CVD-grown MoS2." Physical Review B, 89, (2014) American Physical Society: 125422. http://dx.doi.org/10.1103/PhysRevB.89.125422.