Temperature dependence of Raman responses of few-layer PtS2.

Platinum disulfide (PtS2) is a newly emerging 2D material, which possesses relatively high carrier mobility, a widely tunable band gap from 0.25 to 1.6 eV, and ultra-high air stability, showing a potential in electronics and optoelectronics. Here, for the first time, we study the temperature-dependent Raman spectra on PtS2 with different thicknesses. It was found that with the temperature increase from 80 to 298 K, the [Formula: see text] and [Formula: see text] modes of all samples show linear softening. Moreover, the linear softening with temperature of PtS2 is much smaller than other 2D transition metal dichalcogenides, which could be attributed to the stronger interlayer coupling in PtS2. Our work gives fundamental temperature-dependent vibrational information of PtS2, which will be useful in future PtS2-based electronic devices.