dichalcogenides
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Electron and photon induced selenium migration in single crystal 2H-NbSe2
Transition metal dichalcogenides like 2H-NbSe₂ exhibit remarkable electronic properties, but their performance is highly sensitive to defects, particularly selenium vacancies. Here, we demonstrate controlled migration of Se atoms from the bulk to the surface of NbSe₂ single crystal, induced by heat, electron beam irradiation, and laser excitation. Using Raman spectroscopy, atomic force microscopy, and energy-dispersive…