Abstract

Localized light emission from monolayer MoSe₂ nanodots embedded in monolayer WSe₂ was directly resolved by cathodoluminescence in STEM. The emission depends strongly on nanodot size: large dots emit MoSe₂ excitons, intermediate dots emit interface excitons, and sub-10 nm dots exhibit blue-shifted, quantum-confined interface emission. First-principles calculations were used to model size-dependent electronic structure and explain the observed confinement trend.

Abstract

Localized light emission from monolayer MoSe₂ nanodots embedded in monolayer WSe₂ was directly resolved by cathodoluminescence in STEM. The emission depends strongly on nanodot size: large dots emit MoSe₂ excitons, intermediate dots emit interface excitons, and sub-10 nm dots exhibit blue-shifted, quantum-confined interface emission. First-principles calculations were used to model size-dependent electronic structure and explain the observed confinement trend.

Abstract

Localized light emission from monolayer MoSe₂ nanodots embedded in monolayer WSe₂ was directly resolved by cathodoluminescence in STEM. The emission depends strongly on nanodot size: large dots emit MoSe₂ excitons, intermediate dots emit interface excitons, and sub-10 nm dots exhibit blue-shifted, quantum-confined interface emission. First-principles calculations were used to model size-dependent electronic structure and explain the observed confinement trend.

Abstract

Localized light emission from monolayer MoSe₂ nanodots embedded in monolayer WSe₂ was directly resolved by cathodoluminescence in STEM. The emission depends strongly on nanodot size: large dots emit MoSe₂ excitons, intermediate dots emit interface excitons, and sub-10 nm dots exhibit blue-shifted, quantum-confined interface emission. First-principles calculations were used to model size-dependent electronic structure and explain the observed confinement trend.