Exploring interlayer interaction of SnSe2 by low-frequency Raman spectroscopy

Here, to look insight into the tribological property of SnSe2, which is emerging as a promising material in the field of solar cell and data storage, low-frequency Raman measurements have been employed to figure out the interlayer force constants. Detailed group theory analysis has been provided to help understand the results of Raman spectroscopy and, as well, to classify the many peaks observed in Raman measurements. It has been found that shear force in SnSe2 is lower than lots of other 2D materials, and this suggests that SnSe2 may also play specific role in the field of lubrication or atomic-scale friction researches, for example, by acting as a new kind of superlubric material.