Thermal Conductivity of Few-Layer PtS2 and PtSe2 Obtained from Optothermal Raman Spectroscopy

Two-dimensional (2D) noble transition-metal dichalcogenides (NTMDs) have drawn widespread attention due to the promising applications in electronics and optoelectronics. Here, we studied and measured the thermal transport properties of few-layer PtSe2 and PtS2 using an optothermal Raman technique. First, we obtained the temperature- and laser-correlative Raman spectra of PtS2 and PtSe2 with disparate thicknesses. It is found that with the temperature and laser power increase, the A1g and Eg modes of all specimens show red shifts. The thermal conductivity values can be extracted from these data, which are correlated with the first-order coefficients of study on the relationship between temperature and laser power. The resulting thermal conductivities are 85.6 ± 7.70 and 40.4 ± 4.67 W/(m·K) for 4 nm PtS2 and 4.5 nm PtSe2 at room temperature, respectively. The results of this work help in the design of thermal management NTMD-based devices.