Year: 2017
Type: article
Abstract: Diamond-like CuInTe 2 compound has attracted great attentions recently as a new thermoelectric material.Despite the considerable thermoelectric performance, the relatively high thermal conductivity at low and medium temperature ranges restricted further improvement of thermoelectric performance.Alloying was demonstrated an effective way to introduce mass and strain fluctuations to lower the lattice thermal conductivity in several typical thermoelectric materials.In this work, CuInTe 2-x S x (x=0, 0.05, 0.1, 0.15) solid solutions were fabricated by melting and annealing techniques.Phase purity and element distribution were examined by XRD and SEM-EDS measurements respectively.All the samples were pure phase and all the elements were distributed homogeneously.Callaway model was employed to analyze the thermal transport.It is found that S substitution minimized the lattice thermal conductivity effectively, mainly due to extra phonon scattering induced by strain field fluctuation.However, its electrical properties were deteriorated by S doping, probably due to bigger band gap in CuInS 2 than in CuInTe 2 .Therefore, if the electrical properties being improved by element doping, the CuInTe 2x S x (x=0, 0.05, 0.1, 0.15) solid solutions will achieve high thermoelectric performance.
Source: Journal of Inorganic Materials
DOI: 10.15541/jim20170051
Authors: QIN Yu-Ting, QIU Peng-Fei, SHI Xun, CHEN Li-Dong
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2765342171