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Semiconducting MoS_2(1-x)Se_2x mono­layers where x = 0–0.40 are successfully grown over large areas. A random arrangement of the S and Se atoms and a tunable bandgap photoluminescence are observed. Atomically thin, 2D semiconductor alloys with tunable bandgaps have potential applications in nano- and opto-electronics. Field-effect transistors fabricated with the monolayers exhibit high on/off ratios of >10⁵.

The structure and electronic structure of layered noble-transition-metal dichalcogenides MX₂ (M=Pt and Pd, and chalcogenides X=S, Se, and Te) have been investigated by periodic density functional theory (DFT) calculations. The MS₂ monolayers are indirect band-gap semiconductors whereas the MSe₂ and MTe₂ analogues show significantly smaller band gap and can even become semimetallic or metallic materials. Under mechanical strain these MX₂ materials become quasi-direct band-gap semiconductors. The mechanical-deformation and electron-transport properties of these materials indicate their potential application in flexible nanoelectronics.

Show you're metal: The structure and electronic structure of layered noble-transition-metal dichalcogenides MX₂ with metals M (Pt and Pd) and chalcogenides X (S, Se, and Te) have been investigated with periodic density functional theory calculations. The MS₂ monolayers are indirect band-gap semiconductors whereas the MSe₂ and MTe₂ analogues show a significant decrease in their band-gaps and can even become semimetallic or metallic materials.

Surface defects, acting as traps for charge carriers, are a key factor limiting the performance of colloidal quantum dot (CQD) photovoltaics. Revealing the full electronic band structure of PbS CQD devices, subjected to the latest surface passivation treatments, enables a direct correlation of features in the band structure with device performance characteristics, as described by Osman M. Bakr and co-workers on page 937.

Three-photon pumped stimulated emission and coherent random lasing from colloidal CdSe/CdS/ZnS core–multishell quantum dots are achieved for the first time. These results can offer new possibilities in biology and photonics, as well as at their intersection of biophotonics.