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Band structure of monolayer CSe: (a) pristine monolayer; (b–d) S-doping at concentrations of 1.56%, 2.78%, and 6.25%, respectively; (e) O-doping at 6.25%; (f) Te-doping at 6.25%. Dashed lines specify Fermi level. Possible optical interband transitions are shown by guiding arrows.
