Atomic electrostatic maps of 1D channels in 2D semiconductors using 4D scanning transmission electron microscopy.

ABSTRACT: Defects in materials give rise to fluctuations in electrostatic fields that reflect the local charge density, but imaging this with single atom sensitivity is challenging. However, if possible, this provides information about the energetics of adatom binding, localized conduction channels, molecular functionality and their relationship to individual bonds. Here, ultrastable electron-optics are combined with a high-speed 2D electron detector to map electrostatic fields around individual atoms in 2D monolayers using 4D scanning transmission electron microscopy. Simultaneous imaging of the electric field, phase, annular dark field and the total charge in 2D MoS₂ and WS₂ is demonstrated for pristine areas and regions with 1D wires. The in-gap states in sulphur line vacanc

SUBMITTER: Fang S 

PROVIDER: S-EPMC6408534 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature