Effects of alkaline earth doping on the thermoelectric properties of misfit layer sulfides

Tuned thermoelectric properties of TiS1.5Se0.5 through copper intercalation

“…1). In good agreement with previous reports [11][12][13], the unit cell parameter c along the stacking direction is found to expand from 5.804(5) to 5.826 (7) Å as x increases from 0 to 0.1, whereas, at the same time the in-plane parameter a keeps a rather constant value (3.4388(1) Å). This lattice parameter evolution with x confirms the copper intercalation between TiS 1.5 Se 0.5 slabs.…”

“…Indeed, as the layer and the interlayer spacing can often be modified independently, the possibility to transform and hopefully tune adequately the electronic and thermal transport properties is real. For instance, this has been proven in layered compounds crystallizing in the CaAl 2 Si 2 structure type [1][2][3][4][5], in the CdI 2 type structures [6][7][8][9], or in the parent misfits compounds [11][12][13]. The study of these layered compounds have shown that it is possible to somewhat decouple the thermal and electronic properties as, in a simple view, the crystalline layers primarily conduct the charge carriers whereas the thermal transport is mainly affected by the content of the interlayer spacing.…”

Thermoelectric performance enhancement of (BiS)1.2(TiS2)2 misfit layer sulfide by chromium doping

“…The sample preparation procedure has been reported in our previous work [11]. All pellets obtained from spark plasma sintering (SPS) have relatively high density of over 96%.…”

“…In our previous work, we have substituted several electron acceptor dopants of alkaline earth (AE) into the titanium sites in TiS 2 layers and the bismuth sites in BiS layers [11]. All dopants effectively suppressed carrier concentration, greatly decreasing the electrical conductivity.…”

Enhanced thermoelectric performance of In-substituted GeSb6Te10 with homologous structure

“…15 Doping can change q, substantially affecting the transport properties of TE materials, especially κ; for example, doping Sr and Ca in the BiS block in BiS(TiS 2 ) 2 triggers a transition from an incommensurate (rational q) to commensurate structure (irrational q), increasing κ. 17 While the structural periodicity of homologous compounds can be sensitive to heat treatment and/or composition, 7,18 we found in the present paper that substituting In for Sb in GeSb 6 Te 10 barely affected the periodicity of its modulated structure. Table SI of the supplementary material 15 lists the lattice parameters a 3-layer , c 3-layer , and lattice volume V 3-layer based on a three-layer unit cell.…”