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The colloidal synthesis of a new type of lead‐free halide quadruple‐perovskite nanocrystals (NCs) is reported. The photoluminescence quantum yield and charge‐carrier lifetime of quadruple‐perovskite NCs can be enhanced by 96 and 77‐fold, respectively, via metal alloying. Study of charge‐carrier dynamics provide solid demonstrate that the PL enhancement is due to the elimination of ultrafast (1.4 ps)...
The 2D semiconductor monolayer transition metal dichalcogenides, WS2 and MoS2, are grown by chemical vapor deposition (CVD) and assembled by sequential transfer into vertical layered heterostructures (VLHs). Insulating hBN, also produced by CVD, is utilized to control the separation between WS2 and MoS2 by adjusting the layer number, leading to fine‐scale tuning of the interlayer interactions within...
Monolayer 2D MoS2 grown by chemical vapor deposition is nanopatterned into nanodots, nanorods, and hexagonal nanomesh using block copolymer (BCP) lithography. The detailed atomic structure and nanoscale geometry of the nanopatterned MoS2 show features down to 4 nm with nonfaceted etching profiles defined by the BCP mask. Atomic resolution annular dark field scanning transmission electron microscopy...
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