Abstract

We report the synthesis and characterization of atomically controlled graded alloy monolayers of MoxW₁-xS₂ with a Mo-rich center and W-rich edges. The graded composition produces a continuously tunable bandgap and spatially varying sulfur vacancy concentration. Optical spectroscopy and aberration-corrected STEM reveal vacancy-related intralayer optical transitions, supported by ab initio calculations that identify spin-orbit split sulfur-vacancy states and explain the observed photoluminescence features.

Abstract

We report the synthesis and characterization of atomically controlled graded alloy monolayers of MoxW₁-xS₂ with a Mo-rich center and W-rich edges. The graded composition produces a continuously tunable bandgap and spatially varying sulfur vacancy concentration. Optical spectroscopy and aberration-corrected STEM reveal vacancy-related intralayer optical transitions, supported by ab initio calculations that identify spin-orbit split sulfur-vacancy states and explain the observed photoluminescence features.

Abstract

We report the synthesis and characterization of atomically controlled graded alloy monolayers of MoxW₁-xS₂ with a Mo-rich center and W-rich edges. The graded composition produces a continuously tunable bandgap and spatially varying sulfur vacancy concentration. Optical spectroscopy and aberration-corrected STEM reveal vacancy-related intralayer optical transitions, supported by ab initio calculations that identify spin-orbit split sulfur-vacancy states and explain the observed photoluminescence features.

Abstract

We report the synthesis and characterization of atomically controlled graded alloy monolayers of MoxW₁-xS₂ with a Mo-rich center and W-rich edges. The graded composition produces a continuously tunable bandgap and spatially varying sulfur vacancy concentration. Optical spectroscopy and aberration-corrected STEM reveal vacancy-related intralayer optical transitions, supported by ab initio calculations that identify spin-orbit split sulfur-vacancy states and explain the observed photoluminescence features.