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Structures of monolayer CSe with X-doping, showing two kinds of bonds with d1 and d2 lengths and the angles formed by the two bonds. (a) pristine CSe; (b–d) S-doping at concentrations of 1.56%, 2.78% and 6.25%, respectively; (e) and (f) O-doping and Te-doping at a concentration of 6.25%. Purple, green, yellow, red, and blue balls are Se, C, S, O and Te atoms, respectively.
