Ultrafast and spatially resolved studies of charge carriers in atomically-thin molybdenum disulfide

Abstract

Atomically-thin molybdenum disulfide is emerging as a new nanomaterial with potential applications in the fields of electronic and photonics. Charge carrier dynamics plays an essential role in determining its electronic and optical properties. We report spatially and temporally resolved pump-probe studies of charge carriers in atomically-thin molybdenum disulfide samples fabricated by mechanical exfoliation. Carriers are injected by interband absorption of a 390-nm pump pulse and detected by measuring differential reflection of a time-delayed and spatially-scanned probe pulse that is tuned to an exciton transition. Several parameters on charge carrier dynamics are deduced, including carrier lifetime, diffusion coefficient, diffusion length, and mobility.

5 pages, 3 figures

References in corpus (6)

• Two Dimensional Atomic Crystals
• Anomalous Lattice Vibrations of Single and Few-Layer MoS2
• Enhancement of Carrier Mobility in Semiconductor Nanostructures by Dielectric Engineering
• Visibility of dichalcogenide nanolayers
• Optical identification of atomically thin dichalcogenide crystals
• Determination of the electronic structure of bilayer graphene from infrared spectroscopy results

Cited by in corpus (1)

• Exciton diffusion in semiconducting single-wall carbon nanotubes studied by transient absorption microscopy