Dual defect system of tellurium antisites and silver interstitials in off-stoichiometric Bi₂(Te,Se)_3+ycausing enhanced thermoelectric performance

Abstract

Thermoelectric performance was significantly enhanced with off-stoichiometric Bi2(Te,Se)3+yhaving the dual defect system of Te antisites and Ag interstitials.

Ultrathin Conductive Interlayer with High‐Density Antisite Defects for Advanced Lithium–Sulfur Batteries

“…In Bi 4f spectrum, two peaks at 157.8 and 163.0 eV correspond to the Bi 4f 7/2 (Figure 5b) and Bi 4f 5/2 (Figure 5c). [ 64 ] In addition, there are two other peaks at 159.2 and 164.5 eV, which can be ascribed to the Bi atoms in two different chemical environments: one at the correct position in the lattice while the other occupying the vacant Te site (Bi′ Te ). [ 64,65 ] With adsorption of Li 2 S 6 , all the peaks of Bi 4f shift to lower binding energy.…”

“…[ 64 ] In addition, there are two other peaks at 159.2 and 164.5 eV, which can be ascribed to the Bi atoms in two different chemical environments: one at the correct position in the lattice while the other occupying the vacant Te site (Bi′ Te ). [ 64,65 ] With adsorption of Li 2 S 6 , all the peaks of Bi 4f shift to lower binding energy. Specifically, the Bi 4f 7/2 and 4f 5/2 peaks appear at correct position (marked with green dotted line) while those of Bi′ Te (marked with blue dotted line) shift to lower binding energy by 0.2 and 0.3 eV, respectively.…”

High Thermoelectric Performance of Al2X2Se2 (X = Cl, Br, I) Monolayers with Strong Anisotropy in Lattice Thermal Conductivity

“…With an increasing demand for renewable energy replacing traditional polluting fossil fuels, thermoelectric (TE) technology as a promising energy recovery technique, which can achieve an energy conversion from waste heat to electricity, has been discovered and developed. − The energy conversion ability is expressed via a dimensionless figure of merit where S , T , σ, and κ are the Seebeck coefficient (μV K –1 ), absolute temperature (K), electrical conductivity (S m –1 ), and thermal conductivity (W m –1 K –1 ), respectively, while the thermal conductivity consists of the lattice (κ l ) and electronic (κ e ) thermal conductivity. − In the past decade, many studies were reported on the TE performance of efficient thermoelectric materials such as Bi 2 Te 3 − and PbTe. − However, these traditional TE materials have high costs, toxicity, and element scarcity, which hamper their industrial applications. Consequently, it is necessary to seek better TE materials featured by environmental friendliness and low costs.…”

Interfacial effects in an inorganic/organic composite based on Bi2Te3inducing decoupled transport properties and enhanced thermoelectric performance

“…Some groups have tried to insert various metal atoms into Bi 2 Te 3 crystal lattices. 25–28 These metal atoms can play crucial roles as point defects in Bi 2 Te 3 crystal lattices, which vary the carrier concentration and mobility and/or host phonon-defect scattering; thus, they contribute to improving the electrical properties and/or diminishing the thermal properties.…”