Analysis of a $SeCl4$-graphite intercalate surface by thermovoltage scanning tunneling microscopy

The local thermoelectric properties of a $SeCl4$-graphite intercalate compound $(SeCl4-GIC)$ are studied by means of scanning-tunneling microscopy (STM). The analysis by micro-Raman spectroscopy suggested two domains, a “carbonlike” and a “$SeCl4-GIC$-like.” By using the thermovoltage that arises if a temperature difference between the tunneling tip and the sample of a STM is applied, areas with a difference in the local density of states can be distinguished with high lateral resolution. The differences in the local thermopower may be as large as several hundred $μV/K$⁠. The aim was to estimate the contribution of the different domains to the thermopower of $SeCl4-GIC$⁠.