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 A(1g) and E-g 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.