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

Seifritz, J.; Wagner, Th.; Weyers, B.; Möller, R.
March 2009
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p113112
Academic Journal
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.


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