Temperature and Substrate Dependent Conductivities of CVD Graphene measured by Terahertz Time-Domain Spectroscopy

We measured the temperature dependence of the THz conductivity of graphene prepared on Si, SiO
₂
and MgO substrates in a wide temperature range between 80K and 600 K using THz-TDS. We found that the THz conductivity of graphene shows qualitatively different behaviors depending on the substrate, in particular above room temperature.