High temperature thermoelectric performance of NiCr2Se4

A synergistic approach to achieving the high thermoelectric performance of La-doped SnTe using resonance state and partial band convergence

“…The κ lat conductivity at high temperature is determined Finally confirmed that the κ total of La-doped SnTe samples are significantly suppressed in comparison to the pristine SnTe. The reduction of κ total is mainly attributed to the mass fluctuation caused by point defects and grain boundaries scattering as reported for other thermoelectric materials and 7,22,29 the same is evident from Fig. 7 (b).…”

“…[1][2][3][4] Nevertheless, thermal and electrical conductivities are directly related in the case of metals and these properties can be altered for semiconductors by suitable doping. [1][2][3][4][5][6][7][8] Also, the Seebeck coefficient and electrical conductivity vary reciprocally, causing difficulties in achieving any drastic improvement in the zT. Hence, most of the state-of-the-art thermoelectric materials fall in the category of semiconductors, where their electronic and thermal transport properties can be easily tunable in comparison to metallic systems.…”

“…Hence, most of the state-of-the-art thermoelectric materials fall in the category of semiconductors, where their electronic and thermal transport properties can be easily tunable in comparison to metallic systems. [7][8] Further, enhancement in material performance has to be complemented with improvement in module design to achieve higher device level zT.…”

Extremely low thermal conductivity and high thermoelectric performance in liquid-like Cu2Se1−xSx polymorphic materials

“…[11][12][13][14][15] The rigid anion sublattice provides a crystalline pathway for electrons transport, while the liquid-like cation sublattice can greatly scatter the heat-carrying phonons and even eliminate some of the transverse vibrational modes, leading to simultaneously shortened phonon mean free path and reduced heat capacity below the Dulong-Petit value at high temperatures. 11,13 Motivated by the PLEC concept, many superionic compounds, such as Cu2-xδ (δ = S, Se, Te), 11,12,[16][17][18][19][20] CuAgSe, 21,22 Cu5FeS4, 23 Ag/Cu-based chromium diselenides, 14,24 and argyrodite-type compounds, 15 have been discovered with ultra-low thermal conductivity and high zT values. Among them, copper chalcogenides Cu2-xδ (δ= S, Se, Te) have attracted great attentions due to their unique features of environmentally benign, low-cost, and earth-abundant.…”

Synthesis & tailoring the thermal conductivity of Sr doped Bi2Se3 thermoelectric material

“…Growing needs of energy sustainability have given great attention to the field of thermoelectric materials as they directly transforms the wasteheat into useful electrical energy with the advantage of being reliable, lightweight, robust and environment friendly [1]. The efficiency of thermoelectric device is characterized by the dimensionless figure-of-merit, ZT= 2 / , of the material where is the Seebeck coefficient, is the electrical conductivity and is the thermal conductivity.…”