Effect of microstructure on thermoelectric conversion efficiency in metastable δ-phase AgSbTe2

Advances and Challenges of AgSbSe2‐based Thermoelectric Materials

“…[24][25][26] The disorder of Ag/Sb on the face-centered lattice and the strong anharmonicity of SbÀ Se bond contribute to its intriguing thermal properties. [27][28][29][30] Alloys of AgSbTe 2 with GeTe (TAGS) and PbTe (LAST) are well known for their high peak ZTs of ~1.53 at 720 K [31] and ~2.2 at 800 K, [32] respectively. Very recently, a remarkable ZT value of 2.6 was achieved at 573 K for Cd-doped AgSbTe 2 , making AgSbTe 2 stands out among the mid-temperature materials.…”

“…AgSbTe 2 , exhibiting a rock‐salt crystal structure that resembles PbTe, is a promising lead‐free compound because of its intrinsically low thermal conductivity (0.6–0.7 W m −1 K −1 ) [24–26] . The disorder of Ag/Sb on the face‐centered lattice and the strong anharmonicity of Sb−Se bond contribute to its intriguing thermal properties [27–30] . Alloys of AgSbTe 2 with GeTe (TAGS) and PbTe (LAST) are well known for their high peak ZT s of ∼1.53 at 720 K [31] and ∼2.2 at 800 K, [32] respectively.…”

Solution-grown ternary quasi-cube AgSbTe2 and its optoelectronic performance for broadband photodetection

“…22 Recently, there have been several studies focused on the synthesis on AgSbTe 2 nanocrystals. For instance, Li et al reported AgSbTe 2 samples synthesized using a mixture of appropriate amounts of silver, antimony and tellurium powders in quartz tubes which were then heated up to 900 °C for 24 h. 23 Lee et al prepared metastable delta-phase AgSbTe 2 nanocrystals using conventional melting and hot pressing methods at about 1000 °C for 10 h. 24 Amouyal and co-workers obtained silver antimony telluride compounds with an atomic ratio of about 1 : 1 : 2 by melting metal sources in an evacuated and sealed quartz ampoule under Ar-7 vol% H 2 at 850 °C, although the products contained an Sb 2 Te 3 impurity. 22 Up to now, there have been few reports on growing phase-pure AgSbTe 2 nanocrystals at relatively low-temperatures without specific equipment probably due to the large atomic diameter and heavy atomic mass of the tellurium atom, thus resulting in inactive chemical reactions in terms of thermodynamics and dynamics.…”

Modulated Fermi Level and Relaxed Lattice Strain Leading to Enhanced Thermoelectric Properties in AgSbSe2

“…In recent years, cubic-phase AgSbTe 2 materials have been reported to exhibit impressive thermoelectric performance due to the extremely low lattice thermal conductivity and quite high Seebeck coefficient. − However, the poor reserves of tellurium prompted researchers to seek its cheaper replacement . AgSbSe 2 is a homologue of AgSbTe 2 and exhibits a rock-salt cubic structure, in which Ag atoms and Sb atoms randomly occupy the cation position. − Typically, AgSbSe 2 exhibits a p -type semiconducting behavior and very low thermal conductivity. ,, The reasons for the low lattice thermal conductivity are as follows.…”

“…28−31 However, the poor reserves of tellurium prompted researchers to seek its cheaper replacement. 32 AgSbSe 2 is a homologue of AgSbTe 2 and exhibits a rock-salt cubic structure, in which Ag atoms and Sb atoms randomly occupy the cation position. 33−38 Typically, AgSbSe 2 exhibits a p-type semiconducting behavior and very low thermal conductivity.…”