Electronic structure, optical properties, and lattice dynamics in atomically thin indium selenide flakes

The progressive stacking of chalcogenide single layers gives rise to two- dimensional semiconducting materials with tunable properties that can be exploited for new field-effect transistors and photonic devices. Yet the properties of some members of the chalcogenide family remain unexplored. Indium selenide （InSe） is attractive for applications due to its direct bandgap in the near infrared, controllable p- and n-type doping and high chemical stability. Here, we reveal the lattice dynamics, optical and electronic properties of atomically thin InSe flakes prepared by micromechanical cleavage. Raman active modes stiffen or soften in the flakes depending on which electronic bonds are excited. A progressive blue-shift of the photoluminescence peaks is observed for decreasing flake thickness （as large as 0.2 eV for three single layers）. First-principles calculations predict an even larger increase in the bandgap, 0.40 eV, for three single layers, and as much as 1.1 eV for a single layer. These results are promising from the point of view of the versatility of this material for optoelectronic applications at the nanometer scale and compatible with Si and III-V technologies.

Synthesis and Characterization of WS_(2) Inorganic Nanotubes with Encapsulated/Intercalated CsI

WS2 nanotubes have been filled and intercalated by molten phase caesium iodide.The presence of caesium iodide inside the WS_(2) nanotubes has been determined using high-resolution transmission electron microscopy(HRTEM)coupled with electron energy-loss spectroscopy(EELS)and energy-dispersive X-ray spectroscopy(EDS).Noticeably,a Moirépattern was observed due to the interference between encapsulated CsI and WS_(2) layers.The intercalation of CsI into the host concentric WS2 lattices resulted in an increase in the interplanar spacing.