Large thermoelectric power factor in TiS2 crystal with nearly stoichiometric composition

By Hideto Imai, Yuichi Shimakawa, Y. Kubo. 2001

164 citations recorded by the source corpus.

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

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/133c59cd3173b89dfc46645feb98d4e199e483a8

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electronic, Optical and Magnetic Materials

  1. Xiaobo Yin

In Materials Chemistry

  1. Xiaobo Yin
  2. Yujie Wei
  3. Baowen Li
  4. Xiaokun Gu
  5. Ronggui Yang
  6. Jingjing Qiu
  7. Gang Zhang
  8. Gang Chen

Citations in the corpus