“…[12,13] With the rise of graphene, a large number of 2D materials have been successfully fabricated by various methods, including exfoliation and transfer method, chemical vapor deposition (CVD) method, and physical vapor deposition method (PVD). Typical 2D layered materials include graphene, hexagonal boron nitride (h-BN), [16,17,18] transition metal dichalcogenides (TMDs), [19][20][21][22][23][24][25] and bismuth oxyhalide (BiOX, X = Cl, Br and I), [26] etc., with the electronic properties varied from semimetal to insulator. For 2D layered materials, the neighboring layers stack via weak van der Waals (vdW) interactions, [14,15] which allows to obtain their monolayer or few-layer nanosheets by exfoliating their bulk allotropes.…”