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The thermoelectric compound TiS2 is studied by using the full-potential linearized augmented plane-wave method on the density functional theory with the generalized gradient approximation(GGA) as well as the on-site Coulomb interaction correction(+U).The Seebeck coefficient of TiS2 is calculated based on the electronic structure obtained within the GGA under the consideration of the on-site Coulomb interaction.The calculated Seebeck coefficient at 300K shows that Coulomb interaction U in the range of 4.97-5.42 eV is important to reproduce the experimental data.The obtained energy gap Eg around 0.05 eV indicates that TiS2 is an indirect narrow-gap semiconductor.