Abstract
The ultraviolet photoelectron spectra measurements for 1st and 2nd stage potassium-oxygen-graphite intercalation compounds (KO x -GICs) were carried out for the electronic structure around the Fermi level E F. The dependence of the photoelectron spectra upon the incident photon energy suggests the presence of the oxygen electronic states around E F. The temperature dependence of the thermoelectric power (TEP) of KO x -GICs reveals the positive TEP below around 150 K for 1st stage compound, which suggests the contribution of hole carriers to the transport properties in contrast to the expectation of negative TEP endorsed by the donor type character of KO x -GICs. These experimental findings prove the contribution of intercalate to the electronic structure and transport properties.
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