Scalable colloidal synthesis of Bi₂Te_2.7Se_0.3 plate-like particles give access to a high-performing n-type thermoelectric material for low temperature application

Abstract

Colloidal synthesis is harnessed for gram-scale preparation of hexagonal-shaped plate-like Bi2Te2.7Se0.3 particles, yielding nearly 5 g of the product in one experiment. The resultant textured particles are highly crystalline, phase-pure,...

Relevance of Solidification Kinetics for Enhanced Thermoelectric Performance in Al-Doped Higher Manganese Silicides

“…In this context, waste heat utilization employing thermoelectrics (TE), a heritage space technology for power generation, appears very promising and relies on the ability to attain low-cost materials with a high TE figure of merit ( zT ). , As a dimensionless parameter, zT is commonly used for determining the cumulative efficacy of thermal and electrical transport properties in materials for TE conversion and is expressed as italiczT = ( S 2 σ κ ) T , where S , σ, and κ represent the Seebeck coefficient, electrical conductivity, and thermal conductivity at the absolute temperature ( T ), respectively . High zT is desirable for efficient TE conversion, and is observed largely in expensive chalcogenide-based semiconductors constituting toxic and/or costly materials such as Bi 2 Te 3, − PbTe, − GeTe, , and SnSe. − Thus, in recent years, many inexpensive and nontoxic options, primarily in half Heuslers − and silicides − based alloys, are actively explored for TE applications.…”

A mechanistic view of defect engineered VFeSb half-Heusler alloys

“…A remarkable high-power factor of ∼3 × 10 −3 W m −1 K −2 was achieved for both stoichiometric and defective compositions which are comparable to those of state-of-the-art n-type Bi 2 Te 3 alloys. 81–84 The maxima for the power factor in all samples are attained near room temperatures, but the stoichiometry alteration can both enhance/deteriorate the power factor. Such variation ranges lie between 1–4 × 10 −3 W m −1 K −2 and suggest that a lower V-excess concentration and Fe-deficient compositions are more favorable for maximizing the PF.…”

“…A remarkably high PF of B3 Â 10 À3 W m À1 K À2 was achieved for both Table 1 Hall measurement of the V 1+x Fe 1+y Sb (0 o x, y o 0.1) half-Heusler alloys at room temperature stoichiometric and defective compositions which are comparatively higher near room temperature. [81][82][83][84] Stoichiometric alterations can both enhance/deteriorate the power factor with variations ranging between 1-4 Â 10 À3 W m À1 K À2 at room temperature for the synthesized samples as shown in the inset of Fig. 5(e and f).…”

A Review on Doped/Composite Bismuth Chalcogenide Compounds for Thermoelectric Device Applications: Various Synthesis Techniques and Challenges

“…16a, b, c, and d). The spark plasma sintered thermoelectric compound Bi 0.5 Sb 1.5 Te 3 showed the lowest thermal conductivity of 0.85 W/mK, electrical conductivity of 4.48 S/cm, and the highest ZT of 1.03 at 300 K. 177 Nanopowders of selenium and lutetium co-doped Bi 2 Te 3 are synthesized by hydrothermal method and are sintered using spark plasma sintering technique. By doping of Se into Lu-doped Bi 2 Te 3, the electrical conductivity of Lu 0.1 Bi 1.9 Te 3-x Se x material is found to decrease with the increase in Se content due to the reduced carrier concentration, while the Seebeck coefficient values are observed to be enhanced.…”