Temperature dependent Raman spectroscopic study of mono-, bi-, and tri-layer molybdenum ditelluride

We investigate the thermal properties of mono-, bi- and tri-layer MoTe2 by using temperature-dependent Raman spectroscopy ranging from 90K to 300 K. The E-2g(1) and B-2g(1) modes of MoTe2 blueshift as the temperature decreases. The temperature dependence of the peak positions obtained from mono- to tri-layer MoTe2 is analyzed using the Gruneisen model. The first order temperature coefficients of E-2g(1) and B-2g(1) Raman modes of mono-to tri-layer MoTe2 are extracted. This study provides the fundamental information about the thermal properties of MoTe2 layers, which is crucial for developing thermal and electronic applications of MoTe2 based devices. (C) 2015 AIP Publishing LLC.