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      Large Thermoelectric Power Factor in TiS2 Crystal with Nearly Stoichiometric Composition

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          Abstract

          A TiS\(_{2}\) crystal with a layered structure was found to have a large thermoelectric power factor.The in-plane power factor \(S^{2}/ \rho\) at 300 K is 37.1~\(\mu\)W/K\(^{2}\)cm with resistivity (\(\rho\)) of 1.7 m\(\Omega\)cm and thermopower (\(S\)) of -251~\(\mu\)V/K, and this value is comparable to that of the best thermoelectric material, Bi\(_{2}\)Te\(_{3}\) alloy. The electrical resistivity shows both metallic and highly anisotropic behaviors, suggesting that the electronic structure of this TiS\(_{2}\) crystal has a quasi-two-dimensional nature. The large thermoelectric response can be ascribed to the large density of state just above the Fermi energy and inter-valley scattering. In spite of the large power factor, the figure of merit, \(ZT\) of TiS\(_{2}\) is 0.16 at 300 K, because of relatively large thermal conductivity, 68~mW/Kcm. However, most of this value comes from reducible lattice contribution. Thus, \(ZT\) can be improved by reducing lattice thermal conductivity, e.g., by introducing a rattling unit into the inter-layer sites.

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          Filled Skutterudite Antimonides: A New Class of Thermoelectric Materials

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            Semiconducting Ge clathrates: Promising candidates for thermoelectric applications

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              Thermoelectrics

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                Author and article information

                Journal
                05 November 2001
                Article
                10.1103/PhysRevB.64.241104
                cond-mat/0111063
                2d6898df-471b-4f2b-a303-50422b4a0969
                History
                Custom metadata
                11 pages, 4 figures, to be published in Physical Review B
                cond-mat.mtrl-sci cond-mat.str-el

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