Abstract
Thermoelectric power of graphene nanoribbons (GNRs) has been theoretically investigated by first-principles simulation based on the density-functional theory combined with non-equilibrium Green's function method. The thermoelectric power of GNRs strongly depends on their edge structure and ribbon width. We clarified the condition for the ribbon structure to enhance the thermoelectric power of GNRs. In addition, we found that the thermoelectric power of zigzag-edged GNRs shows peculiar energy dependence originating from edge-localized electronic states with energy near the Fermi level. These results can be explained in terms of the energy-band structure of GNRs.
