Enhancing the thermoelectric performance of n-type Bi₂Te_2.7Se_0.3 through the incorporation of Ag₉AlSe₆ inclusions

Abstract

Bi2Te2.7Se0.3 (BTS) is the best commercial n-type thermoelectric alloy near room temperatures. However, as compared to its p-type counterpart its figure of merit (ZT) and the energy conversion efficiency is...

Attaining High Figure of Merit in the N-Type Bi2Te2.7Se0.3-Ag2Te Composite System via Comprehensive Regulation of Its Thermoelectric Properties

“…In addition, the experiments indicate that the thermoelectric performance obtained for BTS/ f Ag 2 Te ( f = 0.3 wt %) samples have good reproducibility and excellent thermal stability (as shown in Figures S9 and S10). It is noted that the ZT max obtained here (1.31) is higher than that for most n-type Bi 2 Te 3 -based alloys reported previously, ,− as shown in Figure b.…”

“…The calculated ZT ave value increases from 0.75 to 1.00, 0.95, 1.16, 1.02, and 0.88 as f increases from 0 to 0.1, 0.2, 0.3, 0.4, and 0.5 wt % (as given in Figure c), respectively. The ZT ave of the Bi 2 Te 2.7 Se 0.3 / f Ag 2 Te ( f = 0.3 wt %) composite sample is much higher than that reported previously, ,− as shown in Figure d.…”

Enhanced near-room temperature thermoelectric performance and mechanical strength of n-type BiTeSe materials incorporated with Ag2Se inclusions

“…This result shows that our elevated PF ⊥ primarily comes from both large electron mobility (µ) and optimized carrier concentration for the composite samples. Obviously, the obtained largest PF ⊥ = 35.2 μW cm −1 K −2 for the present BTS-Ag 2 Se system is larger than those for reported n-type BTS systems; 22,[35][36][37][38][39][40] this superior electrical performance is significantly higher than that of traditional composite systems and can even be compared with some doped systems (Fig. 4d).…”

“…Fig. 7(a) depicts the TE properties of n-type BTS-based materials achieved in recent years, [35][36][37][38][39][40] and it can be seen that the TE properties of materials achieved by this method have obviously excellent thermoelectric performance near room temperature. As shown in Fig.…”

Enhanced Thermoelectric Properties of p-Type Bi0.5Sb1.5Te3-Cu8GeSe6 Composite Materials

“…However, the poor mechanical properties and mediocre ZT values of zone-melted (ZM) materials severely limit the manufacture of TE devices and further applications. , It is thus of significance to improve the mechanical and TE performance of bismuth-telluride-based materials by sintering methods. For example, hot pressing, − spark plasma sintering, − hot deformation, − and several methods have been applied to introduce various defects, promote grain refining, and weaken the anisotropy, resulting in suppressed thermal conductivities and improved ZT values. ,,− Moreover, during the sintering process, introducing a second phase is a more direct and effective scheme to manipulate the carrier and thermal transport performance of (Bi, Sb) 2 Te 3 -based alloys. − …”