Journal of Electronic Materials

, Volume 40, Issue 5, pp 1271–1280

Intercalation: Building a Natural Superlattice for Better Thermoelectric Performance in Layered Chalcogenides

Authors

  • Chunlei Wan
    • Graduate School of EngineeringNagoya University
    • CREST, Japan Science and Technology Agency
  • Yifeng Wang
    • Graduate School of EngineeringNagoya University
    • CREST, Japan Science and Technology Agency
  • Ning Wang
    • Graduate School of EngineeringNagoya University
  • Wataru Norimatsu
    • CREST, Japan Science and Technology Agency
    • EcoTopia Science InstituteNagoya University
  • Michiko Kusunoki
    • CREST, Japan Science and Technology Agency
    • EcoTopia Science InstituteNagoya University
    • Graduate School of EngineeringNagoya University
    • CREST, Japan Science and Technology Agency
Article

DOI: 10.1007/s11664-011-1565-5

Cite this article as:
Wan, C., Wang, Y., Wang, N. et al. Journal of Elec Materi (2011) 40: 1271. doi:10.1007/s11664-011-1565-5

Abstract

A natural superlattice with composition (SnS)1.2(TiS2)2, built by intercalating a SnS layer into the van der Waals gap of layered TiS2, has been directly observed by high-resolution transmission electron microscopy (HRTEM). The thermoelectric performance is improved in the direction parallel to the layers because the electron mobility is maintained while simultaneously suppressing phonon transport, which is attributed to softening of the transverse sound velocities due to weakened interlayer bonding. In the direction perpendicular to the layers, the lattice thermal conductivity of (SnS)1.2(TiS2)2 is even lower than the predicted minimum thermal conductivity, which may be caused by phonon localization due to the translational disorder of the SnS layers parallel to the layers. Moreover, we propose a large family of misfit-layer compounds (MX)1+x(TX2)n (M = Pb, Bi, Sn, Sb, rare-earth elements; T = Ti, V, Cr, Nb, Ta; X = S, Se; n = 1, 2, 3) with a natural superlattice structure as possible candidate high-performance thermoelectric materials.

Keywords

Natural superlatticethermoelectricmisfit-layer compoundsthermal conductivity

Copyright information

© TMS 2011