Intrinsic effects of substitution and intercalation on thermal transport in two-dimensional TiS2 single crystals

R. Daou (1) , H. Takahashi (2, 1, 3) , S. Hébert (1) , M. Beaumale (2, 1) , E. Guilmeau (1) , A. Maignan (1)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 LaMIPS - Laboratoire de Microélectronique et de Physique des Semiconducteurs
3 Nagoya University

The promising thermoelectric material TiS2 can be easily chemically doped and intercalated. We present here studies of single crystals that are intercalated with excess Ti or Co, or substituted with Ta. We demonstrate the intrinsic impact of these dopants on the thermal transport in the absence of grain boundary scattering. We show that Ta doping has the greatest impact on the thermal scattering rate per ion added, leading to a five-fold reduction in the lattice thermal conductivity as compared to stoichiometric single crystals. © 2015 AIP Publishing LLC.

Keywords: Cobalt; Doping (additives); Grain boundaries; Thermal conductivity; Chemically doped; Grain boundary scattering; Intrinsic effects; Lattice thermal conductivity; Scattering rates; Thermal transport; Thermo-Electric materials; Single crystals

Domains: Chemical Sciences; Chemical Sciences; Cristallography; Chemical Sciences; Material chemistry; Chemical Sciences; Theoretical and/or physical chemistry

R. Daou, H. Takahashi, S. Hébert, M. Beaumale, E. Guilmeau, et al.. Intrinsic effects of substitution and intercalation on thermal transport in two-dimensional TiS2 single crystals. Journal of Applied Physics, 2015, 117 (16), pp.165101. ⟨10.1063/1.4919078⟩. ⟨hal-02184145⟩