“…2D materials have been found to be widely used in various fields such as photodetectors [4,5], optoelectronic materials and so on [6,7]. The group IV metal chalcogenide semiconductors, especially SnSe 2 , has high stability, fast carrier mobility and unique optical response characteristics [8,9], and they have good natural abundance [10,11] and narrow optical band gap (1.0-1.5 eV) [12][13][14]. Previous studies on SnSe 2 materials have mostly focused on the physical properties of the materials [15,16] and their applications in optoelectronic devices [17,18].…”