Vertical Heterostructure of SnS-MoS 2 Synthesized by Sulfur-Preloaded Chemical Vapor Deposition

We synthesize a vertical heterostructure (HS) between tin sulfide (SnS) and molybdenum sulfide (MoS ) by chemical vapor deposition based on the preferential adsorption of sulfur on MoS . Most of the SnS grains nucleate on MoS nanosheets, formatting partially stacked HS with large overlapping regions. Photoluminescence quenching of MoS is observed and illustrates effective charge separation in HS. The HS shows increased reverse saturable absorption relative to MoS and SnS. The preferential adsorption of sulfur powders on MoS and HS growth reported herein will provide a promising approach to the synthesis of other two-dimensional HS.