“…have been identied in the ultrathin limit, but most attention so far has been paid to layered transition metal dichalcogenides (TMDs). [4][5][6][7] Furthermore, graphene shows a zero-band gap which traditionally has limited its application in optoelectronic devices. 8 In addition, layered semiconducting TMDs with a general description of MX 2 (a metal atom, M ¼ Mo, W, Sn, etc.…”